constant int String.__HAVE_SPRINTF_NEGATIVE_F__
Presence of this symbol indicates that sprintf() supports
little endian output for the 'F'-format specifier.
sprintf(), lfun::_sprintf()
constant int String.__HAVE_SPRINTF_STAR_MAPPING__
Presence of this symbol indicates that sprintf() supports
mappings for the '*'-modifier syntax.
sprintf(), lfun::_sprintf()
int(0..) bits(string data)
Gives the actual number of bits needed to represent every
character in the string. Unlike width that only looks at the
allocated string width, bits actually looks at the maximum used
character and delivers a more precise answer than just 8, 16, or
32 bits. The empty string results in 0.
string capitalize(string str)
Convert the first character in str to upper case, and return the
new string.
lower_case(), upper_case()
string common_prefix(array(string) strs)
Find the longest common prefix from an array of strings.
int count(string haystack, string needle)
Count the number of non-overlapping times the string needle
occurs in the string haystack. The special cases for the needle
"" is that it occurs one time in the empty string, zero
times in a one character string and between every character
(length-1) in any other string.
search(), `/()
string expand_tabs(string s, int(1..)|void tab_width, string|void tab, string|void space, string|void newline)
Expands tabs in a string to ordinary spaces, according to common tabulation rules.
int(0..100) fuzzymatch(string a, string b)
This function compares two strings using a fuzzy matching routine. The higher the resulting value, the better the strings match.
Array.diff(), Array.diff_compare_table()
Array.diff_longest_sequence()
string(8bit) hex2string(string(8bit) hex)
Convert a string of hexadecimal digits to binary data. Non-hexadecimal characters will be ignored when between tuples. Eg. "00 00" is ok, but "0 000" isn't.
string2hex()
string implode_nicely(array(string|int|float) foo, string|void separator)
This function implodes a list of words to a readable string, e.g.
({"straw","berry","pie"}) becomes
"straw, berry and pie". If the separator is omitted, the
default is "and". If the words are numbers they are
converted to strings first.
`*()
string int2char(int x)
Same as sprintf("%c",x);
sprintf()
string int2hex(int x)
Same as sprintf("%x",x);, i.e. returns the integer x in
hexadecimal base using lower cased symbols.
sprintf()
string int2roman(int m)
Converts the provided integer to a roman integer (i.e. a string).
Throws an error if m is outside the range 0 to 10000.
string int2size(int size)
Returns the size as a memory size string with suffix, e.g. 43210 is converted into "42.2 kB". To be correct to the latest standards it should really read "42.2 KiB", but we have chosen to keep the old notation for a while. The function knows about the quantifiers kilo, mega, giga, tera, peta, exa, zetta and yotta.
int levenshtein_distance(string a, string b)
This function calculates the Levenshtein distance between two strings a and b. The Levenshtein distance describes the minimal number of character additions, removals or substitutions to apply to convert a to b.
Mathematically, the Levenshtein distance between two strings a, b is given by lev_a,b(|a|,|b|) where
lev_a,b(i, j) == max(i, j), if min(i, j) == 0 lev_a,b(i, j) == min( lev_a,b(i, j-1)+1, lev_a,b(i-1, j)+1, lev_a,b(i-1, j-1) + a_i!=b_j ), else
Note that the first element in the minimum corresponds to inserting a character to a (or deleting a character from b), the second to deleting a character from a and the third to match or mismatch, depending on whether the respective characters are equal.
Example: For example, the Levenshtein distance between "pike" and "bikes" is 2, since the following two edits change one into the other, and there is no way to do it with fewer than two edits: - "pike" -> "bike" (substitute "p" with "b") - "bike" -> "bikes" (add "s" at the end)
Note that the cost to compute the Levenshtein distance is roughly proportional to the product of the two string lengths. So this function is usually used to aid in fuzzy string matching, when at least one of the strings is short.
string normalize_space(string s, string|void whitespace)
sIs returned after white space in it has been normalised. White space is normalised by stripping leading and trailing white space and replacing sequences of white space characters with a single space.
whitespaceDefines what is considered to be white space eligible for normalisation.
It has a default value that starts with " \t\r\n\v\f" and in
addition to that contains all whitespace characters part of Unicode.
The first character denotes the character for replacing whitespace
sequences.
Trailing and leading whitespace around \r and \n characters
is stripped as well (only useful if they're not in the whitespace set).
This function is a lot faster with just one argument (i.e. the builtin whitespace set has an optimised code path).
array(int) range(string s)
Returns the character range of a string in an array of two elements. The first element contains the lower bound and the second the upper. The precision is only 8 bits, so for wide strings only character blocks are known.
string secure(string str)
Marks the string as secure, which will clear the memory area before freeing the string.
Object.secure()
string sillycaps(string str)
Convert the first character in each word (separated by spaces) in
str to upper case, and return the new string.
string soundex(string word)
Returns the soundex value of word according to
the original Soundex algorithm, patented by Margaret O´Dell
and Robert C. Russel in 1918. The method is based on the phonetic
classification of sounds by how they are made. It was only intended
for hashing of english surnames, and even at that it isn't that
much of a help.
string status(int verbose)
Get string table statistics.
Returns a string with an ASCII table containing the current string table statistics.
Currently returns the empty string ("")
if verbose is zero.
The formatting and contents of the result may vary between different versions of Pike.
string string2hex(string data, void|int(0..) flags)
Convert a string of binary data to a hexadecimal string.
flagsThe binary or of the following flags:
| Use upper case characters. |
| The input is in little-endian byte order. |
hex2string()
string trim(string s)
Trim leading and trailing white spaces characters (space, tab,
newline, carriage return, form feed, vertical tab and all the
white spaces defined in Unicode) from the string s.
string trim_whites(string s)
Trim leading and trailing spaces and tabs from the string s.
int(8)|int(16)|int(32) width(string s)
Returns the width of a string.
Three return values are currently possible:
| The string |
| The string |
| The string |
It is possible that a future version of Pike may return
further values. In particular the width 7 seems
like it could be useful.
This class implements the "Bootstring" string transcoder described in ftp://ftp.rfc-editor.org/in-notes/rfc3492.txt.
String.Bootstring String.Bootstring(int base, int tmin, int tmax, int skew, int damp, int initial_bias, int initial_n, int delim, string digits)
Creates a Bootstring transcoder instance using the specified parameters.
baseThe base used by the variable-length integers.
tminThe minimum threshold digit value for the variable-length integers. Must be >=0 and <= tmax.
tmaxThe maximum threshold digit value for the variable-length integers. Must be <= base-1.
skewThe skew term for the bias adapation. Must be >= 1.
dampThe damping factor for the bias adaption. Must be >= 2.
initial_biasThe initial bias for the variable-length integer thresholding. initial_bias % base must be <= base - tmin.
initial_nThe first code point outside the "basic" set of code points.
delimThe "basic" code point used as the delimiter.
digitsThe "basic" code points used as digits. The length of the string should be the same as the base parameter.
string decode(string s)
Decodes a Bootstring encoded string of "basic" code points back to the original string space.
string encode(string s)
Encodes a string using Bootstring encoding into a string constisting only of "basic" code points (< initial_n).
A buffer, used for building strings. It's
conceptually similar to a string, but you can only add
strings to it, and you can only get the value from it once.
There is a reason for those seemingly rather odd limitations, it makes it possible to do some optimizations that really speed things up.
You do not need to use this class unless you add very many strings together, or very large strings.
For the fastest possible operation, write your code like this:
String.Buffer b = String.Buffer( ); function add = b->add; .. call add several times in code ... string result = b->get(); // also clears the buffer
int(0..) search(String.Buffer from, int character, int|void start, int|void end)
Search for a character in the buffer, starting the scan
from start and ending at end (inclusive).
Returns to position in the buffer where the character was found
on success, and UNDEFINED on failure.
Stdio.Buffer()->_search(), search(), lfun::_search()
int(0..) search(String.Buffer from, string substring, int|void start, int|void end)
Search for a substring in the buffer, starting the scan
from start and ending at end (inclusive).
Returns to position in the buffer where the substring was found
on success, and UNDEFINED on failure.
Stdio.Buffer()->_search(), search(), lfun::_search()
int sizeof( String.Buffer arg )
Returns the size of the buffer.
string sprintf(string format, ... String.Buffer arg ... )
It is possible to sprintf a String.Buffer object
as %s just as if it was a string.
String.Buffer res = String.Buffer() + what
String.Buffer() += what
int add(string|String.Buffer ... data)
Adds data to the buffer.
Returns the size of the buffer.
Pike 7.8 and earlier did not support adding String.Buffers
directly.
(int)String.Buffer()
(float)String.Buffer()
(string)String.Buffer()
(array)String.Buffer()
(mapping)String.Buffer()
(multiset)String.Buffer()
It is possible to cast a String.Buffer object to
a string and an int.
void clear()
Empty the buffer, and don't care about the old content.
This function was not available in Pike 7.8 and earlier.
get()
String.Buffer String.Buffer(int initial_size)
Initializes a new buffer.
If no initial_size is specified, 256 is used. If you
know approximately how big the buffer will be, you can optimize
the operation of add() (slightly) by passing the size to this
function.
string get()
Get the data from the buffer.
This will clear the data in the buffer
get_copy(), clear()
string get_copy()
Get the data from the buffer. Significantly slower than get,
but does not clear the buffer.
get()
void putchar(int c)
Appends the character c at the end of the string.
int sprintf(strict_sprintf_format format, sprintf_args ... args)
Appends the output from sprintf at the end of the string.
Returns the resulting size of the String.Buffer.
An object of this class is returned by get_iterator() when
called with a string.
get_iterator
inherit predef::Iterator : predef::Iterator
This is a "compiled" version of the replace function applied on
a string, with more than one replace string. The replace strings
are given to the create method as a from and to array
and are then analyzed. The `() is then called with a
string and the replace rules in the Replace object will be
applied. The Replace object is used internally by the Pike
optimizer and need not be used manually.
String.Replace decode_value(string(8bit) data)
string(8bit) encode_value(String.Replace data)
string res = String.Replace()()
String.Replace String.Replace()
String.Replace String.Replace(mapping(string:string))
String.Replace String.Replace(array(string) from, array(string)|string to)
This is a "compiled" version of the replace function applied on
a string, with just one replace string. The replace strings are
given to the create method as a from and tom string and
are then analyzed. The `() is then called with a string
and the replace rule in the Replace object will be applied. The
Replace object is used internally by the Pike optimizer and need
not be used manually.
String.SingleReplace decode_value(string(8bit) data)
string(8bit) encode_value(String.SingleReplace data)
string res = String.SingleReplace()()
String.SingleReplace String.SingleReplace(string|void from, string|void to)
May be called with either zero or two arguments.
An iterator that iterates over substrings of a string, separated by a character or several different characters.
Typically you don't need to explicitly use the SplitIterator. Expressions like the following are automatically optimized into using a SplitIterator.
foreach(str/"\n", string line)
write("%s\n", line);
inherit predef::Iterator : predef::Iterator
String.SplitIterator String.SplitIterator(string buffer, int|array(int)|multiset(int) split_set, int|void flags, function(:string)|void feed)
bufferThe string to split.
split_setThe character or characters to split on.
flagsSkip empty elements if set.
feedCallback function that is called once the buffer is used up
and the SplitIterator wants more data.
string elite_string(string in, int(0..100)|void leetp, bool|void eightbit)
Translates a string to 1337. The optional argument leetp is the maximum percentage of leetness (100=max leet, 0=no leet).
The translation is performed in three steps, first the necessary elite translations (picture -> pic, cool->kewl etc), then optional translations (ok->k, dude->dood, -ers -> -orz), then calls elite_word on the resulting words.
string elite_word(string in, int(0..100)|void leetp, int(0..2)|void eightbit)
Translates one word to 1337. The optional argument leetp is the maximum percentage of leetness (100=max leet, 0=no leet). elite_word only do character-based translation, for instance from "k" to "|<", but no language translation (no "cool" to "kewl").
Functions that helps generating HTML. All functions generates HTML that is XHTML compliant as well as backwards compatible with old HTML standards in what extent is possible.
array(array(string)) pad_rows(array(array(string)) rows, string|void padding)
Pads out the rows in a array of rows to equal length. The new elements in
the rows will have the value provided in padding, or " ".
string select(string name, array(string)|array(array(string)) choices, void|string selected)
Creates an HTML select list.
nameThe name of the select list. Will be used in the name attribute of the select element.
choicesMay either be an array of strings, where each string is a choice, or an array of pairs. A pair is an array with two strings. The first string is the value of the choice while the second string is the presentation text associated with the value.
selectedThe value that should be selected by default, if any.
select("language", ({ ({ "eng", "English" }), ({ "swe", "Swedish" }), ({ "nor", "Norwegian" }) }), "swe");
string simple_obox(array(array(string)) rows, void|string frame_color, string|void cell_color, void|string width, void|string padding, void|function(int, int, string, string:string) cell_callback)
This function should solve most of the obox needs that arises. It creates a table out of the array of arrays of strings fed into it. The tables will (with default settings) have a thin black outline around the table and between its cells. Much effort has gone into finding a simple HTML reresentation of such obox that is rendered in a similar way in all popular browsers. The current implementation has been tested against IE, Netscape, Mozilla, Opera and Konquest.
rowsSimply an array of arrays with strings. The strings are the values that should appear in the table cells. All rows should have equal number of cells, otherwise the result will not be very eye pleasing.
frame_colorThe color of the surrounding frame. Defaults to "#000000".
cell_colorThe background color of the cells. Defaults to "#ffffff".
widthThe border width. Defaults to "1".
paddingThe amount of padding in each cell. Defaults to "3".
cell_callbackIf provided, the cell callback will be called for each cell. As in parameters it will get the current x and y coordinates in the table. The upper left cell is 0,0. In addition to the coordinates it will also receive the background color and the contents of the current cell. It is expected to return a td-element.
function cb = lambda(int x, int y, string bgcolor, string contents) { if(y%2) return "<td bgcolor='#aaaaff'>"+contents+"</td>"; return "<td bgcolor='"+bgcolor+"'>"+contents+"</td>"; } simple_obox(my_rows, "#0000a0", 0, "1", "3", cb);
pad_rows
Provides the same functionality as the simple_obox function,
in a "streaming" way. The real gain is different addtition methods
as well as the possibility to change the cell callback at any time.
simple_obox
void add_cell(string contents)
Adds a cell with the provided content.
void add_raw_cell(string cell)
Adds this cell to the table unmodified, e.g. it should have an enclosing td or th element.
void add_row(array(string) cells)
Adds a complete row. If the current row is nonempty a new row will be started.
void add_tagdata_cell(string tag, mapping(string:string) args, string contents)
Creates a cell from the provided arguments and adds it to the table.
tagThe name of the element that should be produces. Typically "td" or "th".
argsA mapping with the elements attributes.
contentsThe element contents.
(int)String.HTML.OBox()
(float)String.HTML.OBox()
(string)String.HTML.OBox()
(array)String.HTML.OBox()
(mapping)String.HTML.OBox()
(multiset)String.HTML.OBox()
It is possible to case this object to a string, which does the same
as calling render, and to an array, which returns the cells in an
array of rows.
String.HTML.OBox String.HTML.OBox(void|string frame_color, void|string cell_color, void|string width, void|string padding, void|function(int, int, string, string:string) cell_callback)
void new_row()
Begin a new row. Succeeding cells will be added to this row instead of the current.
void pad_rows()
Ensures that all rows have the same number of cells.
string render()
Returns the result.
void set_cell_callback(function(int, int, string, string:string) cell_callback)
void set_extra_args(array(mapping(string:string)) extra_args)
The argument in the mappings will be added to the cell in the cooresponding column of the table.
void set_extra_args(mapping(string:string) extra_args)
The argument in the mapping will be added to all created table cells.
General functions to operate on arrays.
bool all(array a, function(int(0), mixed ... :mixed) predicate, mixed ... extra_args)
Returns 1 if all of the elements in a fulfills the requirement
predicate( a[i], @extra_args ), otherwise 0. The
predicate should return non-zero for an element that meets the
requirements and zero for those that do not.
Array.all( ({ 2, 4, 6, 8 }), `<, 17 )
any, has_value
bool any(array a, function(__unknown__, __unknown__ ... :mixed) predicate, mixed ... extra_args)
Returns 1 if any of the elements in a fulfills the requirement
predicate( a[i], @extra_args ), otherwise 0. The
predicate should return non-zero for an element that meets the
requirements and zero for those that do not.
Array.any( ({ 2, 4, 6, 8 }), `>, 5 )
all, has_value
array arrayify(void|array|mixed x)
Make an array of the argument, if it isn't already. An undefined argument gives the empty array. This is useful when something is either an array or a basic datatype, for instance in headers from the MIME module or Protocols.HTTP.Server.
xResult depends of the argument type:
arrayify(x) => x
arrayify(x) => ({})
arrayify(x) => ({ x })
array(array) columns(array x, array ind)
Get multiple columns from an array.
This function is equivalent to
map(ind, lambda(mixed i) { return column(x, i); })
column()
array(array) combinations(array arr, int(0..) len)
Returns an array of all combinations of length len of
elements from arr.
permute()
array common_prefix(array(array) arrs)
Find the longest common prefix from an array of arrays.
String.common_prefix
array(array(array)) compact_diff3(array a, array b, array old)
Given three arrays like those returned from diff3, this
function "compacts" the diff3 result by removing all differences
where a and b agrees against old. The result is
on the same form as the result from diff, and doesn't
include the sequence from old.
int count(array|mapping|multiset haystack, mixed needle)
mapping(mixed:int) count(array|mapping|multiset haystack)
Returns the number of occurrences of needle in haystack.
If the optional needle argument is omitted, count instead
works similar to the unix command sort|uniq -c, returning
a mapping with the number of occurrences of each element in
haystack. For array or mapping haystacks, it's the values
that are counted, for multisets the indices, as you'd expect.
String.count, search, has_value
array(array(array)) diff(array a, array b)
Calculates which parts of the arrays that are common to both, and which parts that are not.
Returns an array with two elements, the first is an array of parts in
array a, and the second is an array of parts in array b.
diff_compare_table(), diff_longest_sequence(),
String.fuzzymatch()
array(array(array)) diff3(array a, array b, array c)
Return the three-way difference between the arrays.
Array.diff(), Array.diff_longest_sequence()
array(array(int)) diff_compare_table(array a, array b)
Returns an array which maps from index in a to corresponding
indices in b.
> Array.diff_compare_table( ({ "a","b","c" }), ({ "b", "b", "c", "d", "b" }));
Result: ({
({ }),
({
0,
1,
4
}),
({
2
})
})
diff(), diff_longest_sequence(), String.fuzzymatch()
array(int) diff_dyn_longest_sequence(array a, array b)
Gives the longest sequence of indices in b that have corresponding
values in the same order in a.
This function performs the same operation as diff_longest_sequence(),
but uses a different algorithm, which in some rare cases might be faster
(usually it's slower though).
diff_longest_sequence(), diff(), diff_compare_table(),
String.fuzzymatch()
array(int) diff_longest_sequence(array a, array b)
Gives the longest sequence of indices in b that have corresponding
values in the same order in a.
diff(), diff_compare_table(), String.fuzzymatch()
int(-1..1) dwim_sort_func(string a, string b)
Sort strings containing numbers with respect to their values rather than according to their formatting (this most notably causes leading zeroes to be ignored/unnecessary).
"foo7" will be sorted before "foo27", which will be before "foo100".
array(mixed) everynth(array(mixed) a, void|int(1..) n, void|int(0..) start)
Return an array with every n:th element of the array a.
If n is zero every other element will be returned.
splice(), `/()
array flatten(array a, mapping(array:array)|void state)
Flatten a multi-dimensional array to a one-dimensional array.
Prior to Pike 7.5.7 it was not safe to call this function with cyclic data-structures.
array(array(array)) greedy_diff(array from, array to)
Like Array.diff, but tries to generate bigger continuous chunks of the
differences, instead of maximizing the number of difference chunks. More
specifically, greedy_diff optimizes the cases where Array.diff returns
({ ..., A, Z, B, ({}), C, ... })
({ ..., A, X, B, Y+B, C, ... })
into the somewhat shorter diff arrays
({ ..., A, Z, B+C, ... })
({ ..., A, X+B+Y, B+C, ... })
array(int) interleave_array(array(mapping(int:mixed)) tab)
Interleave a sparse matrix.
Returns an array with offsets that describe how to shift the
rows of tab so that only at most one non-zero value exists in
every column.
array(int) longest_ordered_sequence(array a)
Find the longest ordered sequence of elements.
This function returns an array of the indices in the longest ordered sequence of elements in the array.
diff()
int(-1..1) lyskom_sort_func(string a, string b)
Sort comparison function that does not care about case, nor about the contents of any parts of the string enclosed with '()'
Example: "Foo (bar)" is given the same weight as "foo (really!)"
int(-1..1) oid_sort_func(string a, string b)
Sort with care of numerical sort for OID values, e.g. "1.2.1" before "1.11.1".
|
|
|
|
|
|
In Pike 7.6 and older this function returned 0 both when
a<b and a==b.
sort_array
array(array) partition(array a, function(int(0), mixed ... :mixed) arbiter, mixed ... extra_args)
Splits an array in two, according to an arbitration function
arbiter. The elements in a who return non-zero for the
expression arbiter( a[i], @extra_args ) end up in
the first sub-array, the others in the second. The order is
preserved from the original array.
Array.partition( enumerate( 9 ), lambda(int n) { return n>3 && n<7; } ); > ({ ({ 4, 5, 6 }), ({ 0, 1, 2, 3, 7, 8 }) })
filter, `/, `%
array permute(array in, int(0..) number)
Give a specified permutation of an array.
The number of permutations is equal to sizeof(
(the factorial of the size of the given array).in)!
shuffle()
array pop(array list)
Pops and returns the last value of the array, shortening the array by one element. If there are no elements in the array then 0 is returned otherwise an array is returned where the first returned element is the popped value, and the second element is the modified array.
Array.pop(({ "a", "b", "c", "d" })); > ({ "d", ({ "a", "b", "c" }) })
ADT.Stack, ADT.Stack.pop, ADT.Stack.quick_pop
array push(array list, mixed element)
Threats an Array as a stack and pushes the element onto the end.
Array.push(({ "a", "b", "c", "d" }), "e"); > ({ "a", "b", "c", "d", "e" })
ADT.Stack, ADT.Stack.push
mixed reduce(function(:void) fun, array arr, mixed|void zero)
reduce() sends the first two elements in arr to fun,
then the result and the next element in arr to fun and
so on. Then it returns the result. The function will return
zero if arr is the empty array. If arr has
only one element, that element will be returned.
rreduce()
mixed rreduce(function(:void) fun, array arr, mixed|void zero)
rreduce() sends the last two elements in arr to fun,
then the third last element in arr and the result to fun and
so on. Then it returns the result. The function will return
zero if arr is the empty array. If arr has
only one element, that element will be returned.
reduce()
int search_array(array arr, string|function(:void)|int fun, mixed ... args)
search_array() works like map(), only it returns the index
of the first call that returnes true instead.
If no call returns true, -1 is returned.
sum(), map()
array|zero shift(array list)
Shifts the first value of the array off and returns it, shortening the array by 1 and moving everything down. If there are no elements in the array it returns 0. Returns an array where the first element is the shifted value and the second element is the modified array.
Array.shift(({ "a", "b", "c", "d"})); > ({ "a", ({ "b", "c", "d" }) })
ADT.Stack
array shuffle(array arr)
shuffle() gives back the same elements, but in random order.
The array is modified destructively.
permute()
array sort_array(array arr, function(:void)|void cmp, mixed ... args)
This function sorts the array arr after a compare-function
cmp which takes two arguments and should return 1 if the
first argument is larger then the second. Returns the sorted array
- arr is not sorted destructively.
The remaining arguments args will be sent as 3rd, 4th etc. argument
to cmp.
If cmp is omitted, `>() is used instead.
map(), sort(), `>(), dwim_sort_func, lyskom_sort_func,
oid_sort_func
array(mixed) splice(array(mixed) arr1, array(mixed) arr2, array(mixed) ... more_arrays)
Splice two or more arrays.
This means that the returned array has the first element in the first given array, then the first argument in next array and so on for all arrays. Then the second elements are added, etc.
`/(), `*(), `+(), `-(), everynth()
mixed sum(array a)
Sum the elements of an array using `+. The empty array results in 0.
array sum_arrays(function(int(0) ... :mixed) sum, array ... args)
Applies the function sum columnwise on the elements in the
provided arrays. E.g. sum_arrays(`+,a,b,c) does the same
as `+(a[*],b[*],c[*]).
array(array) transpose(array(array) matrix)
Takes an array of equally sized arrays (essentially a matrix of size M*N) and returns the transposed (N*M) version of it, where rows and columns are exchanged for one another.
array uniq(array a)
Remove elements that are duplicates.
This function returns an copy of the array a with all
duplicate values removed. The order of the values is kept in the
result; it's always the first of several equal elements that is
kept.
Elements are compared with `==. They are also hashed (see
lfun::__hash for further details if the array contains
objects).
array uniq2(array a)
Perform the same action as the Unix uniq command on an array, that is, fold consecutive occurrences of the same element into a single element of the result array:
aabbbcaababb -> abcabab.
See also the uniq function.
array unshift(array list, mixed element)
Does the opposite of "shift". Or the opposite of a "push", depending on how you look at it. Prepends the element to the front of the array and returns the new array.
Array.unshift(({ "b", "c", "d" }), "a"); > ({ "a", "b", "c", "d" })
ADT.Stack
An object of this class is returned by get_iterator() when
called with an array.
get_iterator
inherit predef::Iterator : predef::Iterator
constant Mapping.delete
Alias for m_delete()
An object of this class is returned by get_iterator() when
called with a mapping.
get_iterator
inherit predef::Iterator : predef::Iterator
A mapping look-alike that overrides (ie shadows) another parent mapping.
The class implements most of the usual mapping operations.
protected mapping|ShadowedMapping Mapping.ShadowedMapping.parent
protected local void __create__(mapping|ShadowedMapping parent)
Mapping.ShadowedMapping Mapping.ShadowedMapping(mapping|ShadowedMapping parent, mapping|ShadowedMapping parent, mapping|void shadow, bool|void modify_parent)
parentMapping to be shadowed.
shadowInitial shadow of parent.
modify_parentModifications should be done to parent rather than
to shadow. If this is set, only entries that are
already present in shadow can be modified by later
operations.
Multiset handling.
An object of this class is returned by get_iterator() when
called with a multiset.
get_iterator
inherit predef::Iterator : predef::Iterator
constant Int.NATIVE_MIN
constant Int.NATIVE_MAX
The limits for using the native representation of integers on the current architecture. Any integer that is outside this range uses a more complex and slower representation. Also, some builtin functions that don't expect very large integers might start to complain about invalid argument type when given values outside this range (they typically say something like "Expected integer, got object").
NATIVE_MIN is not greater than -2147483648
(-0x80000000).
NATIVE_MAX is not less than 2147483647
(0x7fffffff).
The size of the native integers can be controlled when Pike is
compiled with the configure flags --with-int-int,
--with-long-int, and --with-long-long-int. The
default is to use the longest available integer type that fits
inside a pointer, which typically means that it's 64 bit on "true"
64 bit architectures.
Inf Int.inf
An object that behaves like positive infinity.
Inf Int.ninf
An object that behaves like negative infinity.
bool parity(int(0..) value)
Returns the parity of the integer value. If the
parity is odd 1 is returned. If it is even 0 is
returned.
int(0..) reflect(int value, int(0..) bits)
Reverses the order of the low order bits number of bits
of the value value.
Any higher order bits of the value will be cleared. The returned value will thus be unsigned.
reverse(), swap_word(), swap_long()
int(32bit) swap_long(int(32bit) i)
Swaps the upper and lower word in a longword, and the upper and lower bytes in the words. Simply put, the bytes are reversed.
swap_word()
int(16bit) swap_word(int(16bit) i)
Swaps the upper and lower byte in a word.
swap_long()
The type of Int.inf. Do not create more instances of this.
constant Float.DIGITS_10
constant Float.MIN_10_EXP
constant Float.MAX_10_EXP
constant Float.MIN
constant Float.MAX
constant Float.EPSILON
These constants define the limits for floats on the current architecture:
The number of decimal digits that can be represented. Any number
with this many decimal digits can be stored in a float and
converted back to decimal form without change. DIGITS_10 is
not less than 6.
Limits of the exponent in decimal base. 10 raised to any number
within this range can be represented in normalized form.
MIN_10_EXP is not greater than -37. MAX_10_EXP is
not less than 37.
The smallest normalized float greater than zero. It's not
greater than 1e-37.
The largest finite float. It's not less than 1e37.
The difference between 1 and the smallest value greater than 1
that can be represented. It's not greater than 1e-5.
The size of the float type can be controlled when Pike is compiled
with the configure flags --with-double-precision and
--with-long-double-precision. The default is to use the
longest available float type that fits inside a pointer.
constant Float.FLOAT_PRECISION
constant Float.DOUBLE_PRECISION
constant Float.LONG_DOUBLE_PRECISION
Tells which C compiler float type that is used for Pike floats.
Only one of these constants will exist (with the value 1)
at runtime.
The float type of the C compiler is used.
The double type of the C compiler is used.
The long double type of the C compiler is used.
The float type can be controlled when Pike is compiled with the
configure flags --with-double-precision and
--with-long-double-precision. The default is to use the
longest available float type that fits inside a pointer.
bool isnan(float x)
Returns true if x is nan.
function(:void) Y(function(:void) f)
The dreaded fixpoint combinator "Y".
The Y combinator is useful when writing recursive lambdas. It converts a lambda that expects a self-reference as its first argument into one which can be called without this argument.
This example creates a lambda that computes the faculty function.
Function.Y(lambda(function f, int n) { return n>1? n*f(n-1) : 1; })
this_function
void call_callback(function(:void) f, mixed ... args)
Call a callback function, but send throws from the callback function (ie, errors) to master()->handle_error. Also accepts if f is zero (0) without error.
Functions.call_callback(the_callback,some,arguments);equals
{ mixed err=catch { if (the_callback) the_callback(some,arguments); }; if (err) master()->handle_error(err); }(Approximately, since call_callback also calls handle_error if 0 were thrown.)
function(:void) composite(function(:void) ... f)
Creates a composite function of the provided functions. The
composition function of f() and g(), q(x)=f(g(x)), is created by
function q = Function.composite(f, g);.
map(input/",", Function.composite(String.trim, upper_case));
function(mixed ... :function(mixed ... :mixed|void)) curry(function(:void) f)
Partially evaluate a function call.
This function allows N parameters to be given to a function taking M parameters (N<=M), yielding a new function taking M-N parameters.
What is actually returned from this function is a function taking N parameters, and returning a function taking M-N parameters.
This example creates a function adding 7 to its argument.
Function.curry(`+)(7)
string defined(function(:void) fun)
Returns a string with filename and linenumber where fun
was defined.
Returns 0 (zero) when no line can be found, e.g. for
builtin functions and functions in destructed objects.
mixed splice_call(array args, function(:void) f, mixed|void ... extra)
Calls the given function with the args array plus the optional
extra arguments as its arguments and returns the result.
Most useful in conjunction with map, and particularly in combination
with sscanf with "...%{...%}..." scan strings (which indeed
was what it was invented for in the first place).
argsThe first arguments the function f expects.
fThe function to apply the arguments on.
extraOptional extra arguments to send to f.
Whatever the supplied function f returns.
class Product(string name, string version) { string _sprintf() { return sprintf("Product(%s/%s)", name, version); } } map(({ ({ "pike", "7.1.11" }), ({ "whitefish", "0.1" }) }), Function.splice_call, Product); ({ /* 2 elements */ Product(pike/7.1.11), Product(whitefish/0.1) })
function(mixed ... :mixed) uncurry(function(:void) f)
This function, given a function taking N parameters, returns a new function taking N+1 parameters. The first argument will be ignored.
> Function.uncurry(`+)(7,2,3) Result: 5
Partially evaluate a function call.
This function returns a function that when called will do the
specified argument mapping. It is similar to curry, but allows
more dynamic changes of the argument evaluation, you can leave the
first argument unspecified while setting others, or simply change
the argument order.
fThe first argument is the function to be called.
bind_argsAll other arguments are either a generic value, which will be sent
as-is to the function or one of the placeholder values defined in
Function.Placeholder, or one of your own implementation (inherit
Function.Placeholder.Base and implement the value function.).
This example returns a function that limits the given argument to between 0 and 99.
import Function.Placeholder; function clip = Function.bind(limit, 0, arg0, 100);
function(:void) Function.bind.f
array(mixed) Function.bind.bind_args
protected local void __create__(function(:void) f, mixed ... bind_args)
Function.bind Function.bind(function(:void) f, mixed ... bind_args)
Placeholder arguments for Function.bind
constant Function.Placeholder.arg0
constant Function.Placeholder.arg1
constant Function.Placeholder.arg2
constant Function.Placeholder.arg3
constant Function.Placeholder.arg4
constant Function.Placeholder.arg5
constant Function.Placeholder.arg6
constant Function.Placeholder.arg7
constant Function.Placeholder.arg8
constant Function.Placeholder.arg9
arg<n> will return an instance of Arg that returns the n:th arg.
For convenience for c++11 developers _0, _1 etc also works.
Note that arg0 is the first argument, not arg1
Arg Function.Placeholder.rest
Return all arguments not used by any Arg or Splice.
Unlike Splice this will return non-continous unused arguments.
This creates a version of call_out that has the function argument as the last argument
import Function.Placeholder; Function.bind( call_out, Arg(-1), rest)
Arg(x) returns the value of argument X
inherit Base : Base
int Function.Placeholder.Arg.num
protected local void __create__(int num)
Function.Placeholder.Arg Function.Placeholder.Arg(int num)
mixed value(bind x, array args)
The function that is called to return the argument value.
Expr(x) returns the result of calling x.
The function will be passed the list of arguments.
If _splice is true, zero or more argument is returned in an array
Function.Placeholder.arg1 is thus more or less equivalent to
Expr(lambda(array args){return args[1];});
inherit Base : Base
function(:void) Function.Placeholder.Expr.func
void|bool Function.Placeholder.Expr._splice
protected local void __create__(function(:void) func, void|bool _splice)
Function.Placeholder.Expr Function.Placeholder.Expr(function(:void) func, void|bool _splice)
Splice(from) adds all arguments starting with argument number from,
optionally ending with end.
Equivalent to args[from .. end]
inherit Base : Base
int Function.Placeholder.Splice.from
void|int Function.Placeholder.Splice.end
protected local void __create__(int from, void|int end)
Function.Placeholder.Splice Function.Placeholder.Splice(int from, void|int end)
array(program) all_inherits(program p)
Enumerate all programs this program inherits, directly or indirectly. Similar to inherit_tree() but returns a flat array.
> class a{} > class b{} > class c{ inherit a; } > class d{ inherit b; inherit c; } > Program.inherit_tree(d); Result: ({ /* 3 elements */ b, c, a })
multiset(Pike.Annotation) annotations(program x, bool|void no_recurse)
Return a multiset with the annotations for all symbols in x attached
to this program.
xProgram whose identifiers should be returned.
no_recurseDo not include annotations recursively added via inherits.
Returns an multiset with annotations added directly to this program.
This function was added in Pike 8.1.
indices(), values(), types(), lfun::_annotations(),
::_annotations()
string defined(program p)
Returns a string with filename and linenumber describing where
the program p was defined.
The returned string is of the format "filename:linenumber".
If it cannot be determined where the program was defined, 0
(zero) will be returned.
string|zero defined(program x, string identifier)
Returns a string with filename and linenumber where identifier
in x was defined.
Returns 0 (zero) when no line can be found, e.g. for
builtin functions.
If identifier can not be found in x this function returns
where the program is defined.
int implements(program prog, program api)
Returns 1 if prog implements api.
array(program) inherit_list(program p)
Returns an array with the programs that p has inherited.
array inherit_tree(program p)
Recursively builds a inheritance tree by fetching programs inheritance lists.
Returns an array with programs or arrays as elements.
> class a{} > class b{} > class c{ inherit a; } > class d{ inherit b; inherit c; } > Program.inherit_tree(d); Result: ({ /* 3 elements */ d, ({ /* 1 element */ program }), ({ /* 2 elements */ c, ({ /* 1 element */ program }) }) })
int inherits(program|object child, program parent)
Returns 1 if child has inherited parent.
Various Abstract Data Types.
inherit _ADT : _ADT
Implements a FIFO bit buffer, i.e. a buffer that operates on bits instead of bytes. It is not designed for performance, but as a way to handle complicated file formats and other standards where you may need to work on unaligned data units of sub byte size, without having to fry your brain while keeping track of all the bits yourself.
> ADT.BitBuffer b=ADT.BitBuffer(); > b->put1(2); (1) Result: ADT.BitBuffer(11) > b->put0(15); (2) Result: ADT.BitBuffer("\300\0"0) > b->drain(); (3) Result: "\300\0" > sizeof(b); (4) Result: 1
int sizeof( ADT.BitBuffer arg )
sizeof() will return the number of bits in the buffer.
ADT.BitBuffer ADT.BitBuffer(void|string data)
The buffer can be initialized with initial data during creation.
string drain()
Drains the buffer of all full (8-bits wide) bytes.
this_program feed(string x)
Adds full bytes to the buffer.
int get(int bits)
Get bits from the buffer.
Throws an error in case of data underflow.
The bits are extracted with the most significant bit first.
this_program put(int value, int bits)
Put bits number of bits with the value value into the
buffer.
value must not be larger than what can be stored with the
number of bits given in bits.
The bits are added to the buffer with the most significant bit first.
this_program put0(int bits)
Put bits number of 0 bits into the buffer.
this_program put1(int bits)
Put bits number of 1 bits into the buffer.
string read(void|int bytes)
Reads bytes (or less) bytes from the buffer and returns as
string.
This is an circular list implemented by an array. It has a constant time
complexity for pop and push. It has a limited max size but it can be
increased with the methods allocate() or [set_max_size()].
bool equal(ADT.CircularList from, mixed coll)
Returns true if the object coll is a CircularList
and contains the same values in the same order.
ADT.CircularList a;
foreach( a; index; value ) orCircularListIterator _get_iterator(void|int ind)
Create and initiate a new CircularListIterator that could be used to iterate over this list.
indIf an ind value is supplied the iterator will be positioned at
that index.
An iterator.
array indices( ADT.CircularList arg )
The indices in this list as an array.
void _insert_element(int index, mixed value)
Insert an element in the list at the position index, the value
at the position index and all above will have their index increased
by one.
indexThe index to insert the value at.
valueThe new value.
An error if the index is out of range.
The max_size is increased by one.
_remove_element()
void _m_clear()
Clear the contents of the list.
clear()
mixed _remove_element(int index)
Remove the values at index index from the list.
indexThe index to remove.
The removed value.
An error if the index is out of range.
The max_size is decreased by one.
_insert_element()
int search(ADT.CircularList from, mixed value, void|int start)
Search the list for a specific value. Return the index of the first
value that is equal to value. If no value was found UNDEFINED
is returned instead
valueThe value to find
startIf a start value is supplied it will start searching at the index
start.
Returns the index of the found value or -1.
An error if the start is out of range.
int sizeof( ADT.CircularList arg )
The number of elements in this list.
array values( ADT.CircularList arg )
The values in this list as an array.
CircularList res = ADT.CircularList() + coll
Addition operator
Append the content of this CircularList and @coll and
return the results as a new CircularList.
collThe lists to append to this list
The result of the append as a new CircularList.
mixed res = ADT.CircularList()[ index ]
Index operator
indexThe index to get the value for, may be negative to index from the end.
The value at the index index
An error if the index is out of range.
ADT.CircularList()[ index ] = value
Index assign operator.
Set the value at the index index to be value
indexThe index to set
valueThe new value
The new value at the index index
An error if the index is out of range.
void add(mixed value, bool|void force)
Add a value at the front of the list
valueThe value to add.
forceAdd the value even if the list is full, in which case the element at the back of the list will be removed.
An error if the list is full and force is false.
force was not supported in Pike 8.0.1800 and earlier.
This is the same operation as push_front().
push_back(), push_front()
void allocate(int elements)
Increase the maxsize of the CircularlList.
elementsAdd this number of new elements to the list.
set_max_size()
(array)ADT.CircularList()
Cast operator.
typeCasts to this type.
Casts to the following types are supported:
| Cast the content of this list to an array. |
An array with the contents of this list.
void clear()
Clear the contents of the list.
Replaced by _m_clear.
ADT.CircularList ADT.CircularList(array|int arg)
Creates a new CircularList around the array arg or a new
CircularList with the maximum size of arg.
int delete_value(mixed value)
Remove the first occurrence of the value value from the list.
valueThe value to remove from the list.
The index of the removed element or -1 if there was no value to remove.
__deprecated__ CircularListIterator first()
Create and initiate a new CircularListIterator that could be used to iterate over this list.
An iterator positioned before the first element of the list.
Replaced by _get_iterator.
With the Pike 8.1 and later iterator API this is identical
to last() and _get_iterator().
_get_iterator(), last()
bool is_empty()
Returns 1 if the list is empty otherwise 0.
__deprecated__ CircularListIterator last()
Create and initiate a new CircularListIterator that could be used to iterate over this list.
An iterator positioned after the last element of the list.
Replaced by _get_iterator.
With the Pike 8.1 and later iterator API this is identical
to first() and _get_iterator().
_get_iterator(), first()
int max_size()
Returns the maximal size of this list.
set_max_size()
mixed peek_back()
The value at the back of the list but do not remove it from the list.
mixed peek_front()
The value at the front of the list but do not remove it from the list.
mixed pop_back()
Remove the value at the back of the list and return it.
The value at the back of the list.
mixed pop_front()
Remove the value at the front of the list and return it.
The value at the front of the list.
void push_back(mixed value, bool|void force)
Add a new value at the end of the list.
valueThe value to add.
forceAdd the value even if the list is full, in which case the element at the front of the list will be removed.
An error if the list is full and force is false.
force was not supported in Pike 8.0.1800 and earlier.
add(), push_front()
void push_front(mixed value, bool|void force)
Add a new value at the front of the list.
valueThe value to add.
forceAdd the value even if the list is full, in which case the element at the back of the list will be removed.
An error if the list is full and force is false.
force was not supported in Pike 8.0.1800 and earlier.
This is the same operation as add().
add(), push_back()
int set_max_size(int(0..) new_size)
new_sizeThe new size of the list.
Returns the old maximal size of the list.
When reducing in size, elements that no longer fit are dropped from the back.
allocate(), max_size()
This is the iterator for the CircularList. It implements the IndexIterator and the OutputIterator.
bool equal(ADT.CircularList.CircularListIterator from, mixed iter)
Compare this iterator with another iterator.
iterThe iterator to compare with
Returns true if both iterators iterates over the same objects and are positioned at the same spot.
int _iterator_index()
The index at the current position.
mixed _iterator_value()
The value at the current position.
CircularListIterator res = ADT.CircularList.CircularListIterator() + steps
Move the iterator steps steps forward (negative value on steps
will cause the iterator to move backwards) and return the result
as a new iterator.
A new iterator positioned steps steps forward.
ADT.CircularList.CircularListIterator() += steps
Move this iterator steps steps forward (negative value on steps
will cause the iterator to move backwards) and return the result.
This iterator positioned steps steps forward.
CircularListIterator res = ADT.CircularList.CircularListIterator() - steps
Move the iterator steps steps backwards (negative value on
steps will cause the iterator to move forwards) and return
the result as a new iterator.
A new iterator positioned steps steps backwards.
bool res = ADT.CircularList.CircularListIterator() < iter
Less then operator
Returns true if this iterator has a lower index
then iter.
bool res = ADT.CircularList.CircularListIterator() > iter
Greater then operator
Returns true if this iterator has a higher index
then iter.
ADT.CircularList.CircularListIterator ADT.CircularList.CircularListIterator(object list, void|int start)
Creates a new iterator for the CircularList list. If start is
supplied it will try to position the iterator at start.
int distance(object iter)
iterThe iterator to measure the distance to.
Returns distance between this iterator and iter.
An error if the two iterator could not be compared.
This operation is only valid if both iterators are
for the same CircularList object.
CircularList get_collection()
Returns the CircularList this iterator currently iterates over.
bool has_next(void|int steps)
Returns true if it is possible to move steps steps
forwards, if steps weren't supplied it check if it is
possible to move one step forward.
bool has_previous(void|int steps)
Returns true if it is possible to move steps steps
backwards, if steps weren't supplied it check if it is
possible to move one step backward.
mixed set_value(mixed val)
Set the value at the current position.
valThe new value
Returns the old value
This class implements a (min-)heap. The value of a child node will always be greater than or equal to the value of its parent node. Thus, the top node of the heap will always hold the smallest value.
__generic__ mixed ValueType = mixed
Type for the values on the heap.
int sizeof( ADT.Heap arg )
Returns the number of elements in the heap.
Element adjust(ValueType|Element value)
Takes a value in the heap and sorts it through the heap to maintain its sort criteria (increasing order).
valueEither the element handle returned by push(), or the pushed
value itself.
Returns the element handle for the value (if present in the heap),
and 0 (zero) otherwise.
Element low_peek()
Returns the Element on top of the heap (which is also the one with
the smallest value in the heap) without removing it.
Returns the smallest Element on the heap if any, and
UNDEFINED otherwise.
peek(), low_pop(), pop()
Element low_pop()
Removes and returns the Element on top of the heap,
which also is the smallest value in the heap.
Returns UNDEFINED if the heap is empty.
pop(), peek(), push(), remove()
ValueType peek()
Returns the item on top of the heap (which is also the smallest value in the heap) without removing it.
Returns the smallest value on the heap if any, and
UNDEFINED otherwise.
low_peek(), pop()
ValueType pop()
Removes and returns the item on top of the heap, which also is the smallest value in the heap.
Throws an error if the heap is empty.
low_pop(), peek(), push(), remove()
Element push(ValueType|Element value)
Push an element onto the heap. The heap will automatically sort itself so that the smallest value will be at the top.
Returns an element handle, which can be used with
adjust() and remove().
If value is a Heap.Element and already present on the heap
this is equivalent to calling adjust().
pop(), remove()
void remove(ValueType|Element value)
Remove a value from the heap.
valueValue to remove.
push(), pop()
Heap element.
__generic__ mixed ValueType = ValueType
ValueType ADT.Heap.Element.value
protected local void __create__(ValueType value)
ADT.Heap.Element ADT.Heap.Element(ValueType value)
A history is a stack where you can only push entries. When the stack has reached a certain size the oldest entries are removed on every push. Other proposed names for this data type is leaking stack and table (where you push objects onto the table in one end and objects are falling off the table in the other.
__generic__ mixed ValueType = mixed
Type for the individual elements on the history stack.
array(int) indices( ADT.History arg )
Returns the index numbers of the history entries available.
int sizeof( ADT.History arg )
A sizeof operation on this object returns the number
of elements currently in the history, e.g. <= the current
max size.
array(ValueType) values( ADT.History arg )
Returns the values of the available history entries.
ValueType res = ADT.History()[ i ]
Get a value from the history as if it was an array, e.g. both positive and negative numbers may be used. The positive numbers are however offset with 1, so [1] is the first entry in the history and [-1] is the last.
ADT.History()[ i ] = value
Overwrite one value in the history. The history position may be
identified either by positive or negative offset, like `[].
ADT.History ADT.History(int(0..) max_size)
max_size is the maximum number of entries that can reside in the
history at the same time.
void flush()
Empties the history. All entries in the history are removed, to allow garbage collect to remove them. The entry sequence counter is not reset.
int get_first_entry_num()
Returns the absolute sequence number of the oldest result still in the history. Returns 0 if there are no results in the history.
int get_latest_entry_num()
Returns the absolute sequence number of the latest result inserted into the history.
int get_maxsize()
Returns the maximum number of values in the history
set_maxsize
void push(ValueType value)
Push a new value into the history.
bool query_no_adjacent_duplicates()
Tells if the History object allows adjacent equal values. 1 means that only uniqe values are allowed adter each other.
set_no_adjacent_duplicates
void set_maxsize(int _maxsize)
Set the maximume number of entries that can be stored in the history simultaneous.
get_maxsize
void set_no_adjacent_duplicates(bool i)
Change how the History object should treat two identical values in a row. If 1 than only unique values are allowed after each other.
query_no_adjacent_duplicates
__generic__ mixed RangeType = mixed
Type for the limits of the interval.
Boundary ADT.Interval.a
Boundary ADT.Interval.b
RangeType ADT.Interval.start
RangeType ADT.Interval.stop
int|float sizeof( ADT.Interval arg )
string sprintf(string format, ... ADT.Interval arg ... )
this_program|zero res = ADT.Interval() & i
this_program res = ADT.Interval() + i
this_program|zero res = ADT.Interval() - interval
bool res = ADT.Interval() == i
this_program res = ADT.Interval() | i
RangeType beginning()
this_program clone(mixed ... args)
bool contains(RangeType|this_program x)
ADT.Interval ADT.Interval(RangeType|Boundary a, RangeType|Boundary b)
RangeType end()
Boundary max(Boundary a, Boundary b)
Boundary min(Boundary a, Boundary b)
bool overlaps(this_program i)
bool touches(this_program i)
__generic__ mixed RangeType = RangeType
int ADT.Interval.Boundary.ux
Read only
RangeType ADT.Interval.Boundary.x
protected local void __create__(RangeType x)
string sprintf(string format, ... ADT.Interval.Boundary arg ... )
RangeType res = ADT.Interval.Boundary() - b
bool res = ADT.Interval.Boundary() < b
bool res = ADT.Interval.Boundary() > b
Boundary res = ~ADT.Interval.Boundary()
ADT.Interval.Boundary ADT.Interval.Boundary(RangeType x)
int unix_time()
__generic__ mixed RangeType = RangeType
inherit Boundary(< RangeType >) : Boundary
string sprintf(string format, ... ADT.Interval.Closed arg ... )
bool res = ADT.Interval.Closed() == b
Boundary res = ~ADT.Interval.Closed()
bool overlaps(RangeType|Boundary b)
bool touches(RangeType|Boundary b)
__generic__ mixed RangeType = RangeType
inherit Boundary(< RangeType >) : Boundary
string sprintf(string format, ... ADT.Interval.Open arg ... )
bool res = ADT.Interval.Open() < b
bool res = ADT.Interval.Open() == b
bool res = ADT.Interval.Open() > b
Boundary res = ~ADT.Interval.Open()
bool overlaps(RangeType|Boundary b)
bool touches(Boundary b)
Linked list of values.
protected List _reverse()
Reverse the list.
reverse()
int(0..) sizeof( ADT.List arg )
Returns the number of elements in the list.
string sprintf(string format, ... ADT.List arg ... )
Describe the list.
sprintf(), lfun::_sprintf()
array values( ADT.List arg )
Returns an array of elements in the list.
mixed res = ADT.List()[ key ]
void append(mixed ... values)
Append values to the end of the list.
insert()
(array)ADT.List()
Cast the lists. array is the only
supported type.
ADT.List ADT.List(mixed ... values)
Create a new List, and initialize it with values.
void flush()
Empties the List.
mixed head()
Get the element at the head of the list.
Throws an error if the list is empty.
is_empty(), tail(), pop()
void insert(mixed ... values)
Insert values at the front of the list.
append()
bool is_empty()
Check if the list is empty.
Returns 1 if the list is empty,
and 0 (zero) if there are elements in the list.
mixed pop()
Pop the element at the head of the list from the list.
Throws an error if the list is empty.
is_empty(), head(), tail(), pop_back()
mixed pop_back()
Pop the element at the tail of the list from the list.
Throws an error if the list is empty.
is_empty(), head(), tail(), pop()
mixed tail()
Get the element at the tail of the list.
Throws an error if the list is empty.
is_empty(), head(), pop_back()
Iterator that loops over the List.
protected mixed _iterator_next()
Advance to the next element in the list.
Returns the new element on success, and UNDEFINED
at the end of the list.
prev()
protected mixed _iterator_value()
Returns the value at the current position.
ADT.List._get_iterator() += steps
Advance or retrace the specified number of steps.
next(), prev
void append(mixed val)
Append val after the current position.
insert(), delete(), set()
_get_iterator copy_iterator()
Returns a copy of the iterator at its current position.
void delete()
Delete the current node.
The current position will advance to the next node.
This function thus performes the reverse operation
of insert().
insert(), append(), set()
bool first()
Reset the iterator to point to the first element in the list.
Returns 1 if there are elements in the list,
and 0 (zero) if the list is empty.
void insert(mixed val)
Insert val at the current position.
append(), delete(), set()
bool next()
Advance to the next element in the list.
Returns 1 on success, and 0 (zero)
at the end of the list.
prev()
bool prev()
Retrace to the previous element in the list.
Returns 1 on success, and 0 (zero)
at the beginning of the list.
next()
void set(mixed val)
Set the value of the current position to val.
insert(), append(), delete()
mixed value()
Returns the value at the current position.
This class works pretty much as a mapping except the order of the indices is kept in the order they are added. This class works equivalent to the Map() class in Javascript.
OrderedMapping m1 = OrderedMapping("foo", 1, "bar", 2); m1->gazonk = 3; foreach (m1; string key; int val) { write("# %s: %d\n", key, val); } /* output: # foo: 1 # bar: 2 # gazonk: 3 */ m_delete(m1, "gazonk"); m1 += OrderedMapping("afoo", 3); foreach (m1; string key; int val) { write("# %s: %d\n", key, val); } /* output: # foo: 1 # bar: 2 # afoo: 3 */
__generic__ mixed IndexType = mixed
Type for the indices of the mapping.
__generic__ mixed ValueType = mixed
Type for the values of the mapping.
(mapping)ADT.OrderedMapping()
(array)ADT.OrderedMapping()
Cast the object into various other types.
This method can not be called on the object. A proper (cast) has
to be done.
how | Will return a |
| Will return an |
| Will return the indices as a |
| Will return the |
ADT.OrderedMapping ADT.OrderedMapping(IndexType|ValueType ... args)
ADT.OrderedMapping m1 = ADT.OrderedMapping("key1", "val1", "key2", "val2");
An error is thrown if the number of arguments isn't even.
argsOdd arguments are the indices, even arguments the values.
"index", "value", "index", "value", ...
ADT.OrderedMapping ADT.OrderedMapping(array(IndexType) keys, array(ValueType) values)
ADT.OrderedMapping m1 = ADT.OrderedMapping(({ "key1", "key2" }), ({ "val1", "val2" }));
And error is thrown if the size of the keys and values doens't match.
keysvaluesThis class implements a priority queue. Each element in the priority queue is assigned a priority value, and the priority queue always remains sorted in increasing order of the priority values. The top of the priority queue always holds the element with the smallest priority. The priority queue is realized as a (min-)heap.
__generic__ mixed ValueType = mixed
Type for the individual elements in the queue.
inherit .Heap(< ValueType >) : Heap
void adjust_pri(elem handle, int|float new_pri)
Adjust the priority value new_pri of an element handle in the
priority queue. The priority queue will automatically sort itself so
that the element with the smallest priority value will be at the top.
ValueType peek()
Returns the item on top of the priority queue (which is also the element with the smallest priority value) without removing it.
ValueType pop()
Removes and returns the item on top of the heap, which also is the smallest value in the heap.
elem push(int|float pri, ValueType val)
Push an element val into the priority queue and assign a priority value
pri to it. The priority queue will automatically sort itself so that
the element with the smallest priority will be at the top.
A simple FIFO queue.
__generic__ mixed ValueType = mixed
Type for the individual elements in the queue.
(array(ValueType))ADT.Queue()
It is possible to cast ADT.Queue to an array.
ADT.Queue ADT.Queue(ValueType ... args)
Creates a queue with the initial items args in it.
void flush()
Empties the queue.
ValueType get()
Returns the next element from the queue, or UNDEFINED if
the queue is empty.
peek(), put()
bool is_empty()
Returns true if the queue is empty, otherwise zero.
ValueType|zero peek()
Returns the next element from the queue without removing it from
the queue. Returns UNDEFINED if the queue is empty.
Prior to Pike 9.0 this function returned a plain 0
when the queue was empty.
get(), put()
void put(ValueType ... items)
Adds items to the queue.
get(), peek()
__deprecated__ ValueType read()
Replaced by get.
__deprecated__ void write(ValueType ... items)
Replaced by put.
This class implements a quantized resource scheduler.
Weighted consumers are added to the scheduler with add(),
which returns a Consumer object.
When there's some of the resource available to be consumed
the resource owner calls get(), which returns the
Consumer that is to use the resource. Consumer()->consume()
is then called with the fraction of the quanta that was consumed
(typically 1.0). The amount of resources allocated to a
consumer is proportional to the weight of the consumer.
A consumer may be temporarily deactivated (in which case it won't
be returned by get(), but still retain its share of the resource
which will be provided later by get() when it has been reactivated.
protected inherit .Heap : Heap
Consumer add(Consumer c)
(Re-)activate a Consumer.
variant Consumer add(int|float weight, mixed val)
Create a Consumer with the weight weight for the value val,
and add it to the Scheduler.
void adjust_weight(Consumer c, int new_weight)
Adjust the weight value new_weight of the Consumer c in the
scheduling table.
Consumer get()
Returns the next Consumer to consume some of the resource.
Returns a Consumer if there are any active Consumers
and UNDEFINED otherwise.
The same Consumer will be returned until it has either
consumed some of the resource, been removed or another
Consumer with lower priority has been added.
void remove(Consumer c)
Remove the Consumer c from the set of active consumers.
The consumer may be reactivated by calling add().
constant ADT.Scheduler.STATE_ACTIVE
A resource consumer.
Active consumers are kept in a (min-)Heap.
inherit Element : Element
float ADT.Scheduler.Consumer.pri
Accumulated deltas and initial priority.
Typically in the range 0.0 .. 2.0, but may temporarily
be outside of the range.
void ADT.Scheduler.Consumer.weight
Getting
Get the weight of the consumer.
Setting
Get the weight of the consumer.
void consume(float delta)
Consume some of the resource.
deltaShare of the resource quanta that was actually consumed.
Typically 1.0, but other values are supported.
This causes the consumer to be reprioritized.
ADT.Scheduler.Consumer ADT.Scheduler.Consumer(int|float weight, mixed v)
The sequence work similar to an array but has the possibility to insert and remove elements. It also has a more powerful iterator.
bool equal(ADT.Sequence from, mixed coll)
Returns true if the object coll is a Sequence
and contains the same values in the same order.
ADT.Sequence a;
foreach( a; index; value ) orSequenceIterator _get_iterator(void|int ind)
Create and initiate a new SequenceIterator that could be used to iterate over this sequence.
indIf an ind value is supplied the iterator will be positioned at
that index.
An iterator.
array indices( ADT.Sequence arg )
The indices in this sequence as an array.
void _insert_element(int index, mixed value)
Insert an element in the sequence at the position index, the value
at the position index and all above will have their index increased
by one.
indexThe index to insert the value at.
valueThe new value.
mixed _remove_element(int index)
Remove the values at index index from the sequence.
indexThe index to remove.
The removed value.
int search(ADT.Sequence from, mixed value, void|int start)
Search the sequence for a specific value. Return the index of the first
value that is equal to value. If no value was found UNDEFINED
is returned instead.
valueThe value to find.
startIf a start value is supplied it will start searching at the index
start.
Returns the index of the found value or UNDEFINED.
int sizeof( ADT.Sequence arg )
The number of elements in this sequence.
array values( ADT.Sequence arg )
The values in this sequence as an array.
Sequence res = ADT.Sequence() & coll
And operator
Perform an and on this sequence and the coll sequence by only returning
those values that is present in both sequences as a new Sequence.
The remaining values is in the same order as they are in this sequence and
the values are compared using `==.
collThe sequence to and to this sequence.
The result of the and as a new Sequence.
Sequence res = ADT.Sequence() + coll
Addition operator
Append the content of @coll to this sequence and return the results
as a new Sequence.
collThe sequences to append to this sequence.
The result of the append as a new Sequence.
Sequence res = ADT.Sequence() - coll
Subtraction operator
Removes those values in this sequence that also are present in @coll
and return the results as a new Sequence.
collThe sequence to subtract from this sequence.
The result of the subtraction as a new Sequence.
mixed res = ADT.Sequence()[ index ]
Index operator.
indexThe index to get the value for, could be negative to index from the end.
The value at the index index.
An error if the index is out of range.
ADT.Sequence()[ index ] = value
Index assign operator.
Set the value at the index index to be value.
indexThe index to set.
valueThe new value.
The new value at the index index.
Sequence res = ADT.Sequence() ^ coll
Xor operator
Perform a xor on this sequence and the coll sequence by returning
those values that is present in one of the sequences but not in both
sequences as a new Sequence.
The values are compared using `==.
collThe sequence to xor with this sequence.
The result of the xor as a new Sequence.
Sequence res = ADT.Sequence() | coll
Or operator
Perform an or on this sequence and the coll sequence by returning
those values that is present in both sequences as a new Sequence.
The values are compared using `==.
collThe sequence to or with this sequence.
The result of the or as a new Sequence.
void add(mixed value)
Add a value at the end of the sequence.
valueThe value to add.
(array)ADT.Sequence()
Cast operator.
typeCasts to this type.
Casts to the following types are supported:
| Cast the content of this sequence to an array. |
An array with the contents of this sequence.
void clear()
Clear the contents of the sequence.
ADT.Sequence ADT.Sequence(array|int arg)
Creates a new Sequence around the array arg or a new
Sequence with the size of arg.
int delete_value(mixed value)
Remove the first occurrence of the value value from the sequence.
valueThe value to remove from the sequence.
The index of the removed element or -1 if there was no value to remove.
SequenceIterator first()
Create and initiate a new SequenceIterator that could be used to iterate over this sequence.
An iterator positioned at the first element in the sequence.
bool is_empty()
Returns 1 if the sequence is empty otherwise 0.
SequenceIterator last()
Create and initiate a new SequenceIterator that could be used to iterate over this sequence.
An iterator positioned after the last element in the sequence.
int max_size()
Returns -1.
This is the iterator for the Sequence. It implements the IndexIterator and the OutputIterator
bool equal(ADT.Sequence.SequenceIterator from, mixed iter)
Compare this iterator with another iterator.
iterThe iterator to compare with.
Returns true if both iterators iterates over the same objects and are positioned at the same spot.
int _iterator_index()
The index at the current position.
int _iterator_next()
Advance to the next position in the sequence.
Returns the new position, or UNDEFINED if
the end of the sequence is reached.
Calling this function when the end of the sequence has already been reached restarts the iterator at the first element of the sequence (if any).
mixed _iterator_value()
The value at the current position.
SequenceIterator res = ADT.Sequence.SequenceIterator() + steps
Move the iterator steps steps forward (negative value on steps
will cause the iterator to move backwards) and return the result
as a new iterator.
A new iterator positioned steps steps forward.
ADT.Sequence.SequenceIterator() += steps
Move this iterator steps steps forward (negative value on steps
will cause the iterator to move backwards) and return the result.
This iterator positioned steps steps forward.
SequenceIterator res = ADT.Sequence.SequenceIterator() - steps
Move the iterator steps steps backwards (negative value on
steps will cause the iterator to move forwards) and return
the result as a new iterator.
A new iterator positioned steps steps backwards.
bool res = ADT.Sequence.SequenceIterator() < iter
Less then operator.
Returns true if this iterator has a lower index
then iter.
bool res = ADT.Sequence.SequenceIterator() > iter
Greater then operator.
Returns true if this iterator is at a higher index
than iter.
ADT.Sequence.SequenceIterator ADT.Sequence.SequenceIterator(object sequence, void|int start)
Creates a new iterator for the sequence sequence. If start is
supplied it will try to position the iterator so that the next
iteration starts at start.
int distance(object iter)
iterThe iterator to measure the distance to.
Returns distance between this iterator and iter.
An error if the two iterator could not be compared.
Sequence get_collection()
Returns the Sequence this iterator currently iterates over.
bool has_next(void|int steps)
Returns true if it is possible to move steps steps
forwards, if steps is not supplied it checks if it is
possible to move one step forward.
bool has_previous(void|int steps)
Returns true if it is possible to move steps steps
backwards, if steps is not supplied it checks if it is
possible to move one step backward.
mixed set_value(mixed val)
Set the value at the current position.
valThe new value.
Returns the old value.
ADT.Set implements a datatype for sets. These sets behave much like multisets, except that they are restricted to containing only one instance of each member value.
From a performance viewpoint, it is probably more efficient for a Pike program to use mappings to serve as sets, rather than using an ADT.Set,so ADT.Set is mainly provided for the sake of completeness and code readability.
__generic__ mixed ValueType = mixed
Type for the individual members of the set.
array(ValueType) indices( ADT.Set arg )
In analogy with multisets, indices() of an ADT.Set givess an array containing all members of the set.
int sizeof( ADT.Set arg )
Number of items in the set.
string sprintf(string format, ... ADT.Set arg ... )
Printable representation of the set.
array(int(1..)) values( ADT.Set arg )
In analogy with multisets, values() of an ADT.Set givess an array indicating the number of occurrences in the set for each position in the member array returned by indices(). (Most of the time, this is probably rather useless for sets, since the result is an array which just contain 1's, one for each member of the set. Still, this function is provided for consistency.
this_program res = ADT.Set() & other
Intersection. Returns a set containing those values that were present in both the operand sets.
this_program res = ADT.Set() - other
Difference. The expression 'A - B', where A and B are sets, returns all elements in A that are not also present in B.
bool res = ADT.Set() < other
True subset. A < B returns true if each item in A is also present in B, and B contains at least one item not present in A.
bool res = ADT.Set() == other
Equality. A == B returns true if all items in A are present in B, and all items in B are present in A. Otherwise, it returns false.
bool res = ADT.Set() > other
True superset. A > B returns true if each item in B is also present in A, and A contains at least one item not present in B.i
bool res = ADT.Set()[ item ]
Indexing a set with a value V gives 1 if V is a member of the set, otherwise 0.
ADT.Set()[ item ] = value
Setting an index V to 0 removes V from the set. Setting it to a non-0 value adds V as a member of the set.
this_program res = ADT.Set() | other
Union. Returns a set containing all elements present in either or both of the operand sets.
void add(ValueType ... items)
Add items to the set.
(array(ValueType))ADT.Set()
An ADT.Set can be cast to an array or a multiset.
bool contains(ValueType item)
Check whether a value is a member of the set.
ADT.Set ADT.Set(void|ADT.Set|array(ValueType)|multiset(ValueType)|mapping(ValueType:mixed) initial_data)
Create an ADT.Set, optionally initialized from another ADT.Set or a compatible type. If no initial data is given, the set will start out empty.
this_program filter(function(ValueType:mixed) f)
Return a filtered version of the set, containing only those members
for which the filtering function f returned true.
The filtering function is called with a single mixed-type argument which is the member value to be checked.
this_program filter_destructively(function(ValueType:mixed) f)
Destructively filter the set, i.e. remove every element for which
the filtering function f returns 0, and then return the set.
The filtering function is called with a single mixed-type argument which is the member value to be checked.
CAVEAT EMPTOR: This function was just a duplicate of filter()
in Pike 8.0 and earlier.
bool is_empty()
Returns 1 if the set is empty, otherwise 0.
array(mixed) map(function(ValueType:mixed) f)
Map the values of a set: calls the map function f once for each
member of the set, returning an array which contains the result of
each one of those function calls. Note that since a set isn't
ordered, the values in the returned array will be in more or less
random order. If you need to know which member value produced which
result, you have to make that a part of what the filtering function
returns.
The filtering function f is called with a single, mixed-type
argument which is the member value to be mapped.
void remove(ValueType ... items)
Remove items from the set.
void reset()
Remove all items from the set.
bool subset(ADT.Set other)
Subset. A <= B returns true if all items in A are also present in B.
bool superset(ADT.Set other)
Superset. A >= B returns true if all items in B are also present in A.
This class implements a simple stack. Instead of adding and removing elements to an array, and thus making it vary in size for every push and pop operation, this stack tries to keep the stack size constant. If however the stack risks to overflow, it will allocate double its current size, i.e. pushing an element on an full 32 slot stack will result in a 64 slot stack with 33 elements.
__generic__ mixed ElementType = mixed
Type for the elements on the stack.
int search(ADT.Stack from, mixed item)
Return the stack-depth to item.
This function makes it possible to use
eg search() and has_value() on the stack.
int sizeof( ADT.Stack arg )
sizeof on a stack returns the number of entries
in the stack.
array(ElementType) values( ADT.Stack arg )
values on a stack returns all the entries in
the stack, in order.
this_program res = ADT.Stack() + s
A stack added with another stack yields a new stack with all the elements from both stacks, and the elements from the second stack at the top of the new stack.
ADT.Stack ADT.Stack(int(1..)|void initial_size)
An initial stack size can be given when a stack is cloned. The default value is 32.
ElementType peek(int|void offset)
Returns an element from the stack, without popping it.
offsetThe number of elements from the top of the stack to skip.
Throws an error if called on an empty stack.
top()
ElementType pop(void|int val)
Pops and returns entry val from the stack, counting
from the top. If no value is given the top element is
popped and returned. All popped entries are freed from
the stack.
void pop_to(int depth)
Pops entries from the stack until the specified depth is
reached. The popped entries are not actually freed, only the
stack pointer is moved.
void push(ElementType val)
Push an element on the top of the stack.
void quick_pop(void|int val)
Pops val entries from the stack, or one entry
if no value is given. The popped entries are not
actually freed, only the stack pointer is moved.
void reset(int(1..)|void initial_size)
Empties the stack, resets the stack pointer and shrinks the stack size to the given value or 32 if none is given.
create
void set_stack(array(ElementType) stack)
Sets the stacks content to the provided array.
ElementType top()
Returns the top element from the stack, without popping it.
Throws an error if called on an empty stack.
peek()
Implements a struct which can be used for serialization and deserialization of data.
class ID3 { inherit ADT.Struct; Item head = Chars(3); Item title = Chars(30); Item artist = Chars(30); Item album = Chars(30); Item year = Chars(4); Item comment = Chars(30); Item genre = Byte(); }
Stdio.File f = Stdio.File("foo.mp3"); f->seek(-128); ADT.Struct tag = ID3(f); if(tag->head=="TAG") { write("Title: %s\n", tag->title); tag->title = "A new title" + "\0"*19; f->seek(-128); f->write( (string)tag ); }
class HollerithString { inherit ADT.Struct; Item strlen = Word(); Item str = Chars(strlen); }
array(string) indices( ADT.Struct arg )
The indices of a struct is the name of the struct items.
int sizeof( ADT.Struct arg )
The size of the struct object is the number of bytes allocated for the struct.
array values( ADT.Struct arg )
The values of a struct is the values of the struct items.
mixed res = ADT.Struct()[ item ]
mixed res = ADT.Struct()->X
The struct can be indexed by item name to get the associated value.
ADT.Struct()[ item ] = y
ADT.Struct()->X = y
It is possible to assign a new value to a struct item by indexing it by name and assign a value.
(int)ADT.Struct()
(float)ADT.Struct()
(string)ADT.Struct()
(array)ADT.Struct()
(mapping)ADT.Struct()
(multiset)ADT.Struct()
The struct can be casted into a string, which is eqivivalent
to running encode, or into an array. When casted into an
array each array element is the encoded value of that struct
item.
ADT.Struct ADT.Struct(void|string|Stdio.File data)
dataData to be decoded and populate the struct. Can either be a file object or a string.
void decode(string|Stdio.File data)
Decodes data according to the struct and populates
the struct variables. The data can either be a file
object or a string.
string encode()
Serializes the struct into a string. This string is equal
to the string fed to decode if nothing in the struct
has been altered.
One byte, integer value between 0 and 255.
inherit Item : Item
ADT.Struct.Byte ADT.Struct.Byte(void|int(8bit) initial_value)
The byte can be initialized with an optional value.
A string of bytes.
inherit Item : Item
ADT.Struct.Chars ADT.Struct.Chars(int|Item size, void|string value)
size is the number of bytes that are part of this struct
item, or optionally an earlier Item that will be looked up in
runtime.
The initial value of the char string is value or,
if not provided, a string of zero bytes.
One word (2 bytes) in intel order, integer value between 0 and 65535.
Word
inherit Word : Word
One longword (4 bytes) in intel order, integer value between 0 and 2^32.
Long
inherit Drow : Drow
ADT.Struct.Gnol ADT.Struct.Gnol(void|int(0..) initial_value)
The longword can be initialized with an optional value.
Interface class for struct items.
One longword (4 bytes) in network order, integer value between 0 and 2^32.
Gnol
inherit Word : Word
ADT.Struct.Long ADT.Struct.Long(void|int(0..) initial_value)
The longword can be initialized with an optional value.
One byte, signed integer value between -128 and 127.
inherit Item : Item
ADT.Struct.SByte ADT.Struct.SByte(void|int(-128..127) initial_value)
The byte can be initialized with an optional value.
One longword (4 bytes) in network order, signed integer value -(2^31) <= x < 2^31-1.
inherit SWord : SWord
ADT.Struct.SLong ADT.Struct.SLong(void|int initial_value)
The longword can be initialized with an optional value.
One word (2 bytes) in network order, signed integer value between 0 and 65535.
inherit Item : Item
ADT.Struct.SWord ADT.Struct.SWord(void|int(-32768..32767) initial_value)
The word can be initialized with an optional value.
One word (2 bytes) in network order, integer value between 0 and 65535.
Drow
inherit Item : Item
ADT.Struct.Word ADT.Struct.Word(void|int(16bit) initial_value)
The word can be initialized with an optional value.
Alias for SWord
inherit SWord : SWord
Alias for SLong
inherit SLong : SLong
64 bit signed integer.
inherit SLong : SLong
Alias for SByte
inherit SByte : SByte
Alias for Word
inherit Word : Word
Alias for Long
inherit Long : Long
64 bit unsigned integer.
inherit Long : Long
Alias for Byte
inherit Byte : Byte
This class implements an hierarchial quantized resource scheduler.
It differs from Scheduler by the [Consumer]s making
up a dependency tree.
Active consumers closer to the root will receive the resource before their children.
Implements most of RFC 7540 section 5.3.
Scheduler
inherit .Scheduler : Scheduler
Consumer|zero ADT.TreeScheduler.root
The root of the Customer dependency tree.
Note that the root is never active (ie added to the Scheduler).
Customers that don't have an explicit dependency depend on root.
variant Consumer add(int|float weight, mixed val, Consumer parent)
Create a Consumer depending on parent with the weight weight
for the value val, and add it to the Scheduler.
A resource consumer.
All consumers (both active and inactive) are nodes in
a dependency tree. This means that to avoid excessive
garbage detach() must be called in consumers that
are no longer to be used.
Active consumers are kept in a (min-)Heap.
inherit ::this_program : this_program
array(Consumer) ADT.TreeScheduler.Consumer.children
Consumers that depend on us.
Consumer|zero ADT.TreeScheduler.Consumer.parent
Consumer that we depend on.
ADT.TreeScheduler.Consumer ADT.TreeScheduler.Consumer(int|float weight, mixed v, Consumer|void parent)
void detach()
Detach from the tree.
Any children are moved to our parent and their weights adjusted to keep their priorities.
If the consumer was active it will be deactivated.
void reparent_siblings()
Reparent all sibling Consumers, so that we become
the only child of our parent.
set_parent()
void set_parent(Consumer new_parent, int|float weight)
Change to a new parent.
new_parentConsumer this object depends on. We will only
get returned by get() when new_parent is
inactive (ie removed).
weightNew weight.
If new_parent depends on us, it will be moved
to take our place in depending on our old parent.
To perform the exclusive mode reparent from RFC 7540
figure 5, call reparent_siblings() after this function.
detach(), remove(), create(), reparent_siblings()
void update_quanta()
Update the cached quanta value.
This function should be called whenever our weight
or that of our siblings has changed.
String buffer with the possibility to read and write data as they would be formatted in structs.
Replaced by Stdio.Buffer.
inherit Stdio.Buffer : Buffer
this_program add_data(string(8bit) s)
Adds the data s verbatim to the end of the buffer.
string(8bit) contents()
Trims the buffer to only contain the data after the read pointer and returns the contents of the buffer.
ADT.struct ADT.struct(void|string(8bit) s)
Create a new buffer, optionally initialized with the
value s.
Gmp.mpz get_bignum(int(1..)|void len)
Reads a bignum written by put_bignum from the buffer.
string(8bit) get_fix_string(int len)
Reads a fixed sized string of length len from the buffer.
array(int) get_fix_uint_array(int(8bit) item_size, int size)
Reads an array of integers as written by put_fix_uint_array
from the buffer.
string(8bit) get_rest()
Get the remaining data from the buffer and clears the buffer.
int(0..) get_uint(int(0..) len)
Reads an unsigned integer from the buffer.
string(8bit) get_var_string(int(0..) len)
Reads a string written by put_var_string from the buffer.
array(int) get_var_uint_array(int(8bit) item_size, int(0..) len)
Reads an array of integers as written by put_var_uint_array
from the buffer.
bool is_empty()
Returns one if there is any more data to read.
string(8bit) pop_data()
Return all the data in the buffer and empties it.
this_program put_bignum(Gmp.mpz i, int(1..)|void len_width)
Appends a bignum i as a variable string preceded with an
unsigned integer of the size len_width declaring the length
of the string. len_width defaults to 2.
this_program put_fix_string(string(8bit) s)
Appends the fix sized string s to the buffer.
this_program put_fix_uint_array(array(int) data, int(8bit) item_size)
Appends an array of unsigned integers of width item_size
to the buffer.
this_program put_uint(int i, int(0..) len)
Appends an unsigned integer in network order to the buffer.
iUnsigned integer to append.
lenLength of integer in bytes.
this_program put_var_string(string(8bit) s, int(0..) len_width)
Appends a variable string s preceded with an unsigned integer
of the size len_width declaring the length of the string. The
string s should be 8 bits wide.
this_program put_var_string_array(array(string(8bit)) data, int(0..) item_size, int(0..) len)
Appends an array of variable length strings with item_size
bytes hollerith coding, prefixed by a len bytes large integer
declaring the total size of the array in bytes.
this_program put_var_uint_array(array(int) data, int(8bit) item_size, int(0..) len)
Appends an array of unsigned integers of width item_size
to the buffer, preceded with an unsigned integer len declaring
the size of the array in bytes.
This module offers CritBit tree implementations for different key types.
These CritBit trees support prefixes as proper keys. Hence they should really be called Tries.
object Tree(void|string|program|mapping type)
Creates a CritBit tree for keys of type type. If no argument is given,
an instance of ADT.CritBit.StringTree is returned. Supported types are "string",
"int", "float", "ipv4" and Calendar.TimeRange.
array(string) sort_ipv4(array(string) a, array ... data)
Sorts an ARRAY OF IPv4-Adresses (and optional netmasks) given in dotted decimal representation with the /23 netmask notation.
> array(string) a = ({ "127.0.0.121", > "127.0.0.0/16", > "127.0.0.1/8", > "127.0.0.0/8", > "128.0.0.0/1", > "192.168.21.3", > "8.8.8.8" }); > write("%O\n", CritBit.sort_ipv4(a)); ({ /* 7 elements */ "8.8.8.8", "127.0.0.0/8", "127.0.0.0/16", "127.0.0.1/8", "127.0.0.121", "128.0.0.0/1", "192.168.21.3" })
inherit IntTree : IntTree
this_program copy()
Copy callback to also clone backwards
int|object decode_key(int i)
Decodes an integer back to a Calendar.TimeRange object. Keeps
a mapping of all keys stored in the tree to transform back.
int encode_key(object|int o)
Encodes a Calendar.TimeRange object into unix timestanp.
This class implements a CritBit-tree/trie that can be used as a
mapping-like data structure. Values of float|int can be
used as indices, while any possible type (also mixed) can
be stored.
CritBit trees are prefixed based search trees that allow for fast random
access as well as prefix and range based lookups. Keys are stored in
alphabetical order and can be iterated over using foreach.
Other than that, it can be used like mapping(float|int:mixed).
ADT.CritBit.FloatTree tree = ADT.CritBit.FloatTree(); float|int key1 = 12.0; tree[key1] = ({ 4, 5, 6 }); tree[key1]; // now is ({ 4, 5, 6 }) m_delete(tree, key1); // tree is empty again
ADT.CritBit.FloatTree tree = ADT.CritBit.FloatTree(); array(float|int) a = ({ 80.4, 99.9, 14.2 }); foreach(a; int idx; float|int val) { tree[val] = idx; } foreach(tree; float|int key; mixed val) { // in here the keys will be reached in order 14.2, 80.4 and 99.9. }
ADT.CritBit.FloatTree tree = ADT.CritBit.FloatTree(); array(float|int) a = ({ 80.4, 99.9, 14.2 }); foreach (a; int idx; float|int val) { tree[val] = idx; } foreach(ADT.CritBit.FloatTree.Iterator (tree, -1); float|int key; mixed val) { // in here the keys will be reached in order 99.9, 80.4 and 14.2. }
ADT.CritBit.FloatTree.Iterator
bool equal(ADT.CritBit.FloatTree from, mixed o)
array indices( ADT.CritBit.FloatTree arg )
Returns a sorted array of indices of the FloatTree.
mixed m_delete(ADT.CritBit.FloatTree from, mixed key)
m_delete callback.
array random( ADT.CritBit.FloatTree arg )
Get a random entry.
An array ({ key, value }).
int sizeof( ADT.CritBit.FloatTree arg )
Gives the number of entries in the FloatTree.
array values( ADT.CritBit.FloatTree arg )
Returns an array of values of the FloatTree object. The returned
array matches
_indices so that mkmapping(indices(tree), values(tree)) would
create a mapping with the same contents as this FloatTree.
mixed res = ADT.CritBit.FloatTree() + o
Add callback. Returns the union of two trees.
mixed res = ADT.CritBit.FloatTree() - o
Sub[s]tract two trees from each other (key-wise).
mixed res = ADT.CritBit.FloatTree()[start..end]
predef::`[..]
mixed res = ADT.CritBit.FloatTree()[ key ]
ADT.CritBit.FloatTree()[ key ] = val
string bkey(mixed key)
Render the internally used binary representation of the key into a string as a strings of '0's and '1's.
(mapping)ADT.CritBit.FloatTree()
Cast callback. Supports only cast to mapping and behaves as the inverse of create().
FloatTree copy()
Create a copy of the tree.
ADT.CritBit.FloatTree ADT.CritBit.FloatTree(array|mapping|void o)
Create a FloatTree from o.
float|int encode_key(mixed o)
mixed decode_key(float|int o)
These callbacks can be implemented when inheriting FloatTree in order
to allow for arbitrary key types. encode_key is similar to the
lfun::_hash() callback. This only works as expected when it is possible
to implement a unique representation for keys. These callbacks are called
everytime a key is stored or indexed in the tree.
int(0..) depth()
Calculate the depth of the tree.
float|int first()
Get the lexicographically first index in the tree.
FloatTree get_subtree(void|mixed key)
Get a copy of the subtree starting at prefix
key.
float|int last()
Get the lexicographically last index in the tree.
float|int next(mixed current)
Get the key after current in lexicographical order.
mixed nth(int(0..) n)
Get the nth entry in order.
An array ({ key, value }).
float|int previous(mixed current)
Get the key before current in lexicographical order.
Iterator class for FloatTree trees. Supports iterating over ranges with arbitrary stepping and direction.
This is used by default when calling foreach on an object of
FloatTree. In foreach the iterator runs over all elements
from the first to the last.
predef::Iterator for a description of the interface.
ADT.CritBit.FloatTree._get_iterator ADT.CritBit.FloatTree._get_iterator(void|int step, void|mixed start, void|mixed stop)
Returns an iterator object that runs from start to
stop using a stepsize of step. The arguments
default to 1, tree->first() and
tree->last(), respectively.
This class implements a CritBit-tree/trie that can be used as a
mapping-like data structure. Values of string can be
used as indices, while any possible type (also mixed) can
be stored.
CritBit trees are prefixed based search trees that allow for fast random
access as well as prefix and range based lookups. Keys are stored in
alphabetical order and can be iterated over using foreach.
Other than that, it can be used like mapping(string:mixed).
ADT.CritBit.IPv4Tree tree = ADT.CritBit.IPv4Tree(); string key1 = "127.0.0.0/8"; tree[key1] = "reject"; tree[key1]; // now is "reject" m_delete(tree, key1); // tree is empty again
ADT.CritBit.IPv4Tree tree = ADT.CritBit.IPv4Tree(); array(string) a = ({ "10.243.7.1", "127.0.0.1/8", "172.16.5.2" }); foreach(a; int idx; string val) { tree[val] = idx; } foreach(tree; string key; mixed val) { // in here the keys will be reached in order "10.243.7.1", "127.0.0.1/8" and "172.16.5.2". }
ADT.CritBit.IPv4Tree tree = ADT.CritBit.IPv4Tree(); array(string) a = ({ "10.243.7.1", "127.0.0.1/8", "172.16.5.2" }); foreach (a; int idx; string val) { tree[val] = idx; } foreach(ADT.CritBit.IPv4Tree.Iterator (tree, -1); string key; mixed val) { // in here the keys will be reached in order "172.16.5.2", "127.0.0.1/8" and "10.243.7.1". }
ADT.CritBit.IPv4Tree.Iterator
bool equal(ADT.CritBit.IPv4Tree from, mixed o)
array indices( ADT.CritBit.IPv4Tree arg )
Returns a sorted array of indices of the IPv4Tree.
mixed m_delete(ADT.CritBit.IPv4Tree from, mixed key)
m_delete callback.
array random( ADT.CritBit.IPv4Tree arg )
Get a random entry.
An array ({ key, value }).
int sizeof( ADT.CritBit.IPv4Tree arg )
Gives the number of entries in the IPv4Tree.
array values( ADT.CritBit.IPv4Tree arg )
Returns an array of values of the IPv4Tree object. The returned
array matches
_indices so that mkmapping(indices(tree), values(tree)) would
create a mapping with the same contents as this IPv4Tree.
mixed res = ADT.CritBit.IPv4Tree() + o
Add callback. Returns the union of two trees.
mixed res = ADT.CritBit.IPv4Tree() - o
Sub[s]tract two trees from each other (key-wise).
mixed res = ADT.CritBit.IPv4Tree()[start..end]
predef::`[..]
mixed res = ADT.CritBit.IPv4Tree()[ key ]
ADT.CritBit.IPv4Tree()[ key ] = val
string bkey(mixed key)
Render the internally used binary representation of the key into a string as a strings of '0's and '1's.
(mapping)ADT.CritBit.IPv4Tree()
Cast callback. Supports only cast to mapping and behaves as the inverse of create().
string|int common_prefix()
Returns the common prefix of all keys.
If the tree has no elements, UNDEFINED is returned.
IPv4Tree copy()
Create a copy of the tree.
ADT.CritBit.IPv4Tree ADT.CritBit.IPv4Tree(array|mapping|void o)
Create a IPv4Tree from o.
string encode_key(mixed o)
mixed decode_key(string o)
These callbacks can be implemented when inheriting IPv4Tree in order
to allow for arbitrary key types. encode_key is similar to the
lfun::_hash() callback. This only works as expected when it is possible
to implement a unique representation for keys. These callbacks are called
everytime a key is stored or indexed in the tree.
int(0..) depth()
Calculate the depth of the tree.
string first()
Get the lexicographically first index in the tree.
IPv4Tree get_subtree(void|mixed key)
Get a copy of the subtree starting at prefix
key.
string last()
Get the lexicographically last index in the tree.
string next(mixed current)
Get the key after current in lexicographical order.
mixed nth(int(0..) n)
Get the nth entry in order.
An array ({ key, value }).
string previous(mixed current)
Get the key before current in lexicographical order.
Iterator class for IPv4Tree trees. Supports iterating over ranges with arbitrary stepping and direction.
This is used by default when calling foreach on an object of
IPv4Tree. In foreach the iterator runs over all elements
from the first to the last.
predef::Iterator for a description of the interface.
ADT.CritBit.IPv4Tree._get_iterator ADT.CritBit.IPv4Tree._get_iterator(void|int step, void|mixed start, void|mixed stop)
Returns an iterator object that runs from start to
stop using a stepsize of step. The arguments
default to 1, tree->first() and
tree->last(), respectively.
This class implements a CritBit-tree/trie that can be used as a
mapping-like data structure. Values of int can be
used as indices, while any possible type (also mixed) can
be stored.
CritBit trees are prefixed based search trees that allow for fast random
access as well as prefix and range based lookups. Keys are stored in
alphabetical order and can be iterated over using foreach.
Other than that, it can be used like mapping(int:mixed).
ADT.CritBit.IntTree tree = ADT.CritBit.IntTree(); int key1 = 12; tree[key1] = ({ 1, 2 ,3 }); tree[key1]; // now is ({ 1, 2 ,3 }) m_delete(tree, key1); // tree is empty again
ADT.CritBit.IntTree tree = ADT.CritBit.IntTree(); array(int) a = ({ 1025, 15000, 3 }); foreach(a; int idx; int val) { tree[val] = idx; } foreach(tree; int key; mixed val) { // in here the keys will be reached in order 3, 1025 and 15000. }
ADT.CritBit.IntTree tree = ADT.CritBit.IntTree(); array(int) a = ({ 1025, 15000, 3 }); foreach (a; int idx; int val) { tree[val] = idx; } foreach(ADT.CritBit.IntTree.Iterator (tree, -1); int key; mixed val) { // in here the keys will be reached in order 15000, 1025 and 3. }
ADT.CritBit.IntTree.Iterator
bool equal(ADT.CritBit.IntTree from, mixed o)
array indices( ADT.CritBit.IntTree arg )
Returns a sorted array of indices of the IntTree.
mixed m_delete(ADT.CritBit.IntTree from, mixed key)
m_delete callback.
array random( ADT.CritBit.IntTree arg )
Get a random entry.
An array ({ key, value }).
int sizeof( ADT.CritBit.IntTree arg )
Gives the number of entries in the IntTree.
array values( ADT.CritBit.IntTree arg )
Returns an array of values of the IntTree object. The returned
array matches
_indices so that mkmapping(indices(tree), values(tree)) would
create a mapping with the same contents as this IntTree.
mixed res = ADT.CritBit.IntTree() + o
Add callback. Returns the union of two trees.
mixed res = ADT.CritBit.IntTree() - o
Sub[s]tract two trees from each other (key-wise).
mixed res = ADT.CritBit.IntTree()[start..end]
predef::`[..]
mixed res = ADT.CritBit.IntTree()[ key ]
ADT.CritBit.IntTree()[ key ] = val
string bkey(mixed key)
Render the internally used binary representation of the key into a string as a strings of '0's and '1's.
(mapping)ADT.CritBit.IntTree()
Cast callback. Supports only cast to mapping and behaves as the inverse of create().
IntTree copy()
Create a copy of the tree.
ADT.CritBit.IntTree ADT.CritBit.IntTree(array|mapping|void o)
Create a IntTree from o.
int encode_key(mixed o)
mixed decode_key(int o)
These callbacks can be implemented when inheriting IntTree in order
to allow for arbitrary key types. encode_key is similar to the
lfun::_hash() callback. This only works as expected when it is possible
to implement a unique representation for keys. These callbacks are called
everytime a key is stored or indexed in the tree.
int(0..) depth()
Calculate the depth of the tree.
int first()
Get the lexicographically first index in the tree.
IntTree get_subtree(void|mixed key)
Get a copy of the subtree starting at prefix
key.
int last()
Get the lexicographically last index in the tree.
int next(mixed current)
Get the key after current in lexicographical order.
mixed nth(int(0..) n)
Get the nth entry in order.
An array ({ key, value }).
int previous(mixed current)
Get the key before current in lexicographical order.
Iterator class for IntTree trees. Supports iterating over ranges with arbitrary stepping and direction.
This is used by default when calling foreach on an object of
IntTree. In foreach the iterator runs over all elements
from the first to the last.
predef::Iterator for a description of the interface.
ADT.CritBit.IntTree._get_iterator ADT.CritBit.IntTree._get_iterator(void|int step, void|mixed start, void|mixed stop)
Returns an iterator object that runs from start to
stop using a stepsize of step. The arguments
default to 1, tree->first() and
tree->last(), respectively.
Data structure representing a set of disjunct ADT.Interval objects. Can be thought
of as an interval with gaps.
ADT.CritBit.RangeSet ADT.CritBit.RangeSet(function(:void)|object|program tree)
Create a RangeSet from a given tree program.
object ADT.CritBit.Reverse.tree
protected local void __create__(object tree)
ADT.CritBit.Reverse ADT.CritBit.Reverse(object tree)
This class implements a CritBit-tree/trie that can be used as a
mapping-like data structure. Values of string can be
used as indices, while any possible type (also mixed) can
be stored.
CritBit trees are prefixed based search trees that allow for fast random
access as well as prefix and range based lookups. Keys are stored in
alphabetical order and can be iterated over using foreach.
Other than that, it can be used like mapping(string:mixed).
ADT.CritBit.StringTree tree = ADT.CritBit.StringTree(); string key1 = "foo"; tree[key1] = ({ 7, 8, 9 }); tree[key1]; // now is ({ 7, 8, 9 }) m_delete(tree, key1); // tree is empty again
ADT.CritBit.StringTree tree = ADT.CritBit.StringTree(); array(string) a = ({ "fooo", "bar", "ahead" }); foreach(a; int idx; string val) { tree[val] = idx; } foreach(tree; string key; mixed val) { // in here the keys will be reached in order "ahead", "bar" and "foo". }
ADT.CritBit.StringTree tree = ADT.CritBit.StringTree(); array(string) a = ({ "fooo", "bar", "ahead" }); foreach (a; int idx; string val) { tree[val] = idx; } foreach(ADT.CritBit.StringTree.Iterator (tree, -1); string key; mixed val) { // in here the keys will be reached in order "foo", "bar" and "ahead". }
ADT.CritBit.StringTree.Iterator
bool equal(ADT.CritBit.StringTree from, mixed o)
array indices( ADT.CritBit.StringTree arg )
Returns a sorted array of indices of the StringTree.
mixed m_delete(ADT.CritBit.StringTree from, mixed key)
m_delete callback.
array random( ADT.CritBit.StringTree arg )
Get a random entry.
An array ({ key, value }).
int sizeof( ADT.CritBit.StringTree arg )
Gives the number of entries in the StringTree.
array values( ADT.CritBit.StringTree arg )
Returns an array of values of the StringTree object. The returned
array matches
_indices so that mkmapping(indices(tree), values(tree)) would
create a mapping with the same contents as this StringTree.
mixed res = ADT.CritBit.StringTree() + o
Add callback. Returns the union of two trees.
mixed res = ADT.CritBit.StringTree() - o
Sub[s]tract two trees from each other (key-wise).
mixed res = ADT.CritBit.StringTree()[start..end]
predef::`[..]
mixed res = ADT.CritBit.StringTree()[ key ]
ADT.CritBit.StringTree()[ key ] = val
string bkey(mixed key)
Render the internally used binary representation of the key into a string as a strings of '0's and '1's.
(mapping)ADT.CritBit.StringTree()
Cast callback. Supports only cast to mapping and behaves as the inverse of create().
string|int common_prefix()
Returns the common prefix of all keys.
If the tree has no elements, UNDEFINED is returned.
StringTree copy()
Create a copy of the tree.
ADT.CritBit.StringTree ADT.CritBit.StringTree(array|mapping|void o)
Create a StringTree from o.
string encode_key(mixed o)
mixed decode_key(string o)
These callbacks can be implemented when inheriting StringTree in order
to allow for arbitrary key types. encode_key is similar to the
lfun::_hash() callback. This only works as expected when it is possible
to implement a unique representation for keys. These callbacks are called
everytime a key is stored or indexed in the tree.
int(0..) depth()
Calculate the depth of the tree.
string first()
Get the lexicographically first index in the tree.
StringTree get_subtree(void|mixed key)
Get a copy of the subtree starting at prefix
key.
string last()
Get the lexicographically last index in the tree.
string next(mixed current)
Get the key after current in lexicographical order.
mixed nth(int(0..) n)
Get the nth entry in order.
An array ({ key, value }).
string previous(mixed current)
Get the key before current in lexicographical order.
Iterator class for StringTree trees. Supports iterating over ranges with arbitrary stepping and direction.
This is used by default when calling foreach on an object of
StringTree. In foreach the iterator runs over all elements
from the first to the last.
predef::Iterator for a description of the interface.
ADT.CritBit.StringTree._get_iterator ADT.CritBit.StringTree._get_iterator(void|int step, void|mixed start, void|mixed stop)
Returns an iterator object that runs from start to
stop using a stepsize of step. The arguments
default to 1, tree->first() and
tree->last(), respectively.
An abstract data type for binary relations.
This datatype implements something similar to a set of tuples <left, right>, or a multi-valued mapping.
mixed sizeof( ADT.Relation.Binary arg )
Returns the number of relation entries in the relation. (Or with other words: the number of relations in the relation set.)
mixed res = ADT.Relation.Binary() & rel
The expression `rel1 & rel2' returns a new relation which has those and only those relation entries that are present in both rel1 and rel2.
mixed res = ADT.Relation.Binary()()
Does the same as the contains function: returns true if the
relation "left R right" exists, and otherwise false.
mixed res = ADT.Relation.Binary() + rel
mixed res = ADT.Relation.Binary() | rel
The expression `rel1 | rel2' and `rel1 + rel2' returns a new relation which has all the relation entries present in rel1, or rel2, or both.
mixed res = ADT.Relation.Binary() - rel
The expression `rel1 - rel2' returns a new relation which has those and only those relation entries that are present in rel1 and not present in rel2.
this_program add(mixed left, mixed right)
Adds "left R right" as a member of the relation. Returns
the same relation.
mixed contains(mixed left, mixed right)
Return true/false: does the relation "left R right" exist?
object filter(function(:void) f)
Filters the entries in the relation, and returns a relation with
all those entries for which the filtering function f returned
true. The function f gets two arguments: the left and the right
value for every entry in the relation.
this_program filter_destructively(function(:void) f)
Filters the entries in the relation destructively, removing all
entries for which the filtering function f returns false.
The function f gets two arguments: the left and the right value
for each entry in the relation.
array|zero find_shortest_path(mixed from, mixed to, void|multiset avoiding)
Assuming the relation's domain and range sets are equal, and that
the relation xRy means "there is a path from node x to node y",
find_shortest_path attempts to find a path with a minimum number
of steps from one given node to another. The path is returned as an
array of nodes (including the starting and ending node), or 0 if no
path was found. If several equally short paths exist, one of them
will be chosen pseudorandomly.
Trying to find a path from a node to itself will always succeed, returning an array of one element: the node itself. (Or in other words, a path with no steps, only a starting/ending point).
The argument avoiding is either 0 (or omitted), or a multiset of
nodes that must not be part of the path.
mixed get_id()
Return the ID value which was given as first argument to create().
this_program make_symmetric()
Makes the relation symmetric, i.e. makes sure that if xRy is part of the relation set, then yRx should also be a part of the relation set.
array map(function(:void) f)
Maps every entry in the relation. The function f gets two arguments: the left and the right relation value. Returns an array with the return values of f for each and every mapped entry.
Note: since the entries in the relation are not ordered,
the returned array will have its elements in no particular
order. If you need to know which relation entry produced which
result in the array, you have to make that information part
of the value that f returns.
this_program remove(mixed left, mixed right)
Removes "left R right" as a member of the relation. Returns
the same relation.
An iterator which makes all the left/right entities in the relation available as index/value pairs.
ADT.Table is a generic module for manipulating tables.
Each table contains one or several columns. Each column is associated with a name, the column name. Optionally, one can provide a column type. The Table module can do a number of operations on a given table, like computing the sum of a column, grouping, sorting etc.
All column references are case insensitive. A column can be referred to by its position (starting from zero). All operations are non-destructive. That means that a new table object will be returned after, for example, a sort.
The table base-class.
array(string) indices( ADT.Table.table arg )
This method returns the column names for the table. The case used when the table was created will be returned.
int sizeof( ADT.Table.table arg )
This method returns the number of rows in the table.
array(array) values( ADT.Table.table arg )
This method returns the contents of a table as a two dimensional array. The format is an array of rows. Each row is an array of columns.
bool res = ADT.Table.table() == table
This method compares two tables. They are equal if the contents of the tables and the column names are equal. The column name comparison is case insensitive.
array res = ADT.Table.table()[ column ]
Same as col().
this_program append_bottom(object table)
This method appends two tables. The table given as an argument will be added at the bottom of the current table. Note, the column names must be equal. The column name comparison is case insensitive.
this_program append_right(object table)
This method appends two tables. The table given as an argument will be added on the right side of the current table. Note that the number of rows in both tables must be equal.
array col(int|string column)
This method returns the contents of a given column as an array.
ADT.Table.table ADT.Table.table(array(array) table, array(string) column_names, array(mapping(string:string))|void column_types)
The ADT.Table.table class takes two or three arguments:
tableThe first argument is a two-dimensional array consisting of
one array of columns per row. All rows must have the same
number of columns as specified in column_names.
column_namesThis argument is an array of column names associated with each
column in the table. References by column name are case insensitive.
The case used in column_names will be used when the table is
displayed. A column can also be referred to by its position,
starting from zero.
column_typesThis is an optional array of mappings. The column type
information is only used when displaying the table. Currently, only the
keyword "type" is recognized. The type can be specified as
"text" or "num" (numerical). Text columns are left
adjusted, whereas numerical columns are right adjusted. If a mapping
in the array is 0 (zero), it will be assumed to be a text column.
If column_types is omitted, all columns will displayed as text.
See ADT.Table.ASCII.encode() on how to display a table.
ADT.Table.ASCII.encode()
object decode(string s)
This method returns a table object from a binary string
representation of a table, as returned by encode().
this_program distinct(int|string ... columns)
This method groups by the given columns and returns a table with only unique rows. When no columns are given, all rows will be unique. A new table object will be returned.
string encode()
This method returns a binary string representation of the table. It is useful when one wants to store a the table, for example in a file.
this_program group(mapping(int|string:function(:void))|function(:void) f, mixed ... args)
This method calls the function f for each column each time a
non uniqe row will be joined. The table will be grouped by the
columns not listed. The result will be returned as a new table object.
this_program limit(int n)
This method truncates the table to the first n rows and returns
a new object.
object map(function(:void) f, array(int|string)|int|string columns, mixed ... args)
This method calls the function f for all rows in the table.
The value returned will replace the values in the columns given
as argument to map. If the function returns an array, several
columns will be replaced. Otherwise the first column will be
replaced. The result will be returned as a new table object.
this_program remove(int|string ... columns)
Like select(), but the given columns will not be in the
resulting table.
this_program rename(string|int from, string to)
This method renames the column named from to to and
returns a new table object. Note that from can be the column
position.
protected this_program reverse()
This method reverses the rows of the table and returns a new table object.
array row(int row_number)
This method returns the contents of a given row as an array.
object rsort(int|string ... columns)
Like sort(), but in descending order.
this_program select(int|string ... columns)
This method returns a new table object with the selected columns only.
this_program sort(int|string ... columns)
This method sorts the table in ascendent order on one or several columns and returns a new table object. The left most column is sorted last. Note that the sort is stable.
rsort()
this_program sum(int|string ... columns)
This method sums all equal rows. The table will be grouped by the columns not listed. The result will be returned as a new table object.
mapping type(int|string column, void|mapping type)
This method gives the type for the given column.
If a second argument is given, the old type will be replaced
with type. The column type is only used when the table is displayed.
The format is as specified in create().
this_program where(array(int|string)|int|string columns, function(:void) f, mixed ... args)
This method calls the function for each row. If the function returns zero, the row will be thrown away. If the function returns something non-zero, the row will be kept. The result will be returned as a new table object.
string encode(object table, void|mapping options)
This method returns a table represented in ASCII suitable for
human eyes. options is an optional mapping. If the keyword
"indent" is used with a number, the table will be
indented with that number of space characters.