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--[[
--[[
This module is intended to provide access to basic string functions.
This module is intended to provide access to basic string functions.
Most of the functions provided here can be invoked with named parameters,
Most of the functions provided here can be invoked with named parameters,
unnamed parameters, or a mixture. If named parameters are used, Mediawiki will
unnamed parameters, or a mixture. If named parameters are used, Mediawiki will
automatically remove any leading or trailing whitespace from the parameter.
automatically remove any leading or trailing whitespace from the parameter.
Depending on the intended use, it may be advantageous to either preserve or
Depending on the intended use, it may be advantageous to either preserve or
remove such whitespace.
remove such whitespace.
Global options
Global options
ignore_errors: If set to 'true' or 1, any error condition will result in
ignore_errors: If set to 'true' or 1, any error condition will result in
an empty string being returned rather than an error message.
an empty string being returned rather than an error message.
error_category: If an error occurs, specifies the name of a category to
error_category: If an error occurs, specifies the name of a category to
include with the error message. The default category is
include with the error message. The default category is
[Category:Errors reported by Module String].
[Category:Errors reported by Module String].
no_category: If set to 'true' or 1, no category will be added if an error
no_category: If set to 'true' or 1, no category will be added if an error
is generated.
is generated.
Unit tests for this module are available at Module:String/tests.
Unit tests for this module are available at Module:String/tests.
]]
]]
local str = {}
local str = {}
--[[
subcount
This function returns the count of substring in source string.
Usage:
{{#invoke:String|subcount|source_string|substring|plain_flag}}
OR
{{#invoke:String|subcount|s=source_string|pattern=substring|plain=plain_flag}}
Parameters
s: The string to search
pattern: The pattern or string to find within the string
plain: A flag indicating that the substring should be understood as plain
text. Defaults to true.
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the target string.
]]
function str.subcount( frame )
local new_args = str._getParameters( frame.args, {'s', 'pattern', 'plain'} );
local s = new_args['s'] or '';
local plain_flag = str._getBoolean( new_args['plain'] or true );
local pattern = new_args['pattern'] or '';
if s == '' or pattern == '' then
return 0;
end
if plain_flag then
pattern = str._escapePattern( pattern );
end
local _, count = mw.ustring.gsub(s, pattern, "")
return count;
end
--[[
--[[
If invoked using named parameters, Mediawiki will automatically remove any leading or
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the target string.
trailing whitespace from the target string.
]]
]]
function str.len( frame )
function str.len( frame )
local new_args = str._getParameters( frame.args, {'s'} );
local s = new_args['s'] or '';
return mw.ustring.len( s )
end
end
i: The fist index of the substring to return, defaults to 1.
i: The fist index of the substring to return, defaults to 1.
j: The last index of the string to return, defaults to the last character.
j: The last index of the string to return, defaults to the last character.
The first character of the string is assigned an index of 1. If either i or j
The first character of the string is assigned an index of 1. If either i or j
is a negative value, it is interpreted the same as selecting a character by
is a negative value, it is interpreted the same as selecting a character by
counting from the end of the string. Hence, a value of -1 is the same as
counting from the end of the string. Hence, a value of -1 is the same as
selecting the last character of the string.
selecting the last character of the string.
If the requested indices are out of range for the given string, an error is
If the requested indices are out of range for the given string, an error is
reported.
reported.
]]
]]
function str.sub( frame )
function str.sub( frame )
local new_args = str._getParameters( frame.args, { 's', 'i', 'j' } );
local s = new_args['s'] or '';
local i = tonumber( new_args['i'] ) or 1;
local j = tonumber( new_args['j'] ) or -1;
local len = mw.ustring.len( s );
-- Convert negatives for range checking
if i < 0 then
i = len + i + 1;
end
if j < 0 then
j = len + j + 1;
end
if i > len or j > len or i < 1 or j < 1 then
return str._error( 'Значение индекса подстроки выходит за допустимые границы' );
end
if j < i then
return str._error( 'Неверный порядок индексов подстроки' );
end
return mw.ustring.sub( s, i, j )
end
end
]]
]]
function str.sublength( frame )
function str.sublength( frame )
local i = tonumber( frame.args.i ) or 0
local len = tonumber( frame.args.len )
return mw.ustring.sub( frame.args.s, i + 1, len and ( i + len ) )
end
end
match
match
This function returns a substring from the source string that matches a
This function returns a substring from the source string that matches a
specified pattern.
specified pattern.
{{#invoke:String|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
{{#invoke:String|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
OR
OR
{{#invoke:String|match|s=source_string|pattern=pattern_string|start=start_index
{{#invoke:String|pos|s=source_string|pattern=pattern_string|start=start_index
|match=match_number|plain=plain_flag|nomatch=nomatch_output}}
|match=match_number|plain=plain_flag|nomatch=nomatch_output}}
start: The index within the source string to start the search. The first
start: The index within the source string to start the search. The first
character of the string has index 1. Defaults to 1.
character of the string has index 1. Defaults to 1.
match: In some cases it may be possible to make multiple matches on a single
match: In some cases it may be possible to make multiple matches on a single
string. This specifies which match to return, where the first match is
string. This specifies which match to return, where the first match is
match= 1. If a negative number is specified then a match is returned
match= 1. If a negative number is specified then a match is returned
counting from the last match. Hence match = -1 is the same as requesting
counting from the last match. Hence match = -1 is the same as requesting
the last match. Defaults to 1.
the last match. Defaults to 1.
If invoked using named parameters, Mediawiki will automatically remove any leading or
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from each string. In some circumstances this is desirable, in
trailing whitespace from each string. In some circumstances this is desirable, in
other cases one may want to preserve the whitespace.
other cases one may want to preserve the whitespace.
If the match_number or start_index are out of range for the string being queried, then
If the match_number or start_index are out of range for the string being queried, then
this function generates an error. An error is also generated if no match is found.
this function generates an error. An error is also generated if no match is found.
If one adds the parameter ignore_errors=true, then the error will be suppressed and
If one adds the parameter ignore_errors=true, then the error will be suppressed and
an empty string will be returned on any failure.
an empty string will be returned on any failure.
]]
]]
function str.match( frame )
function str.match( frame )
local new_args = str._getParameters( frame.args, {'s', 'pattern', 'start', 'match', 'plain', 'nomatch'} );
local s = new_args['s'] or '';
local start = tonumber( new_args['start'] ) or 1;
local plain_flag = str._getBoolean( new_args['plain'] or false );
local pattern = new_args['pattern'] or '';
local match_index = math.floor( tonumber(new_args['match']) or 1 );
local nomatch = new_args['nomatch'];
if s == '' then
return str._error( 'Пустая строка поиска' );
end
if pattern == '' then
return str._error( 'Пустой шаблон поиска' );
end
if math.abs(start) < 1 or math.abs(start) > mw.ustring.len( s ) then
return str._error( 'Индекс начала поиска выходит за допустимые границы' );
end
if match_index == 0 then
return str._error( 'Индекс совпадения выходит за допустимые границы' );
end
if plain_flag then
pattern = str._escapePattern( pattern );
end
local result
if match_index == 1 then
-- Find first match is simple case
result = mw.ustring.match( s, pattern, start )
else
if start > 1 then
s = mw.ustring.sub( s, start );
end
local iterator = mw.ustring.gmatch(s, pattern);
if match_index > 0 then
-- Forward search
for w in iterator do
match_index = match_index - 1;
if match_index == 0 then
result = w;
break;
end
end
else
-- Reverse search
local result_table = {};
local count = 1;
for w in iterator do
result_table[count] = w;
count = count + 1;
end
result = result_table[ count + match_index ];
end
end
if result == nil then
if nomatch == nil then
return str._error( 'Совпадение не найдено' );
else
return nomatch;
end
else
return result;
end
end
end
If invoked using named parameters, Mediawiki will automatically remove any leading or
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the target string. In some circumstances this is desirable, in
trailing whitespace from the target string. In some circumstances this is desirable, in
other cases one may want to preserve the whitespace.
other cases one may want to preserve the whitespace.
The first character has an index value of 1.
The first character has an index value of 1.
If one requests a negative value, this function will select a character by counting backwards
If one requests a negative value, this function will select a character by counting backwards
from the end of the string. In other words pos = -1 is the same as asking for the last character.
from the end of the string. In other words pos = -1 is the same as asking for the last character.
]]
]]
function str.pos( frame )
function str.pos( frame )
local new_args = str._getParameters( frame.args, {'target', 'pos'} );
local target_str = new_args['target'] or '';
local pos = tonumber( new_args['pos'] ) or 0;
if pos == 0 or math.abs(pos) > mw.ustring.len( target_str ) then
return str._error( 'Значение индекса строки выходит за допустимые границы' );
end
return mw.ustring.sub( target_str, pos, pos );
end
end
This function duplicates the behavior of {{str_find}}, including all of its quirks.
This function duplicates the behavior of {{str_find}}, including all of its quirks.
This is provided in order to support existing templates, but is NOT RECOMMENDED for
This is provided in order to support existing templates, but is NOT RECOMMENDED for
new code and templates. New code is recommended to use the "find" function instead.
new code and templates. New code is recommended to use the "find" function instead.
]]
]]
function str.str_find( frame )
function str.str_find( frame )
local new_args = str._getParameters( frame.args, {'source', 'target'} );
local source_str = new_args['source'] or '';
local target_str = new_args['target'] or '';
if target_str == '' then
return 1;
end
local start = mw.ustring.find( source_str, target_str, 1, true )
if start == nil then
start = -1
end
return start
end
end
If invoked using named parameters, Mediawiki will automatically remove any leading or
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the parameter. In some circumstances this is desirable, in
trailing whitespace from the parameter. In some circumstances this is desirable, in
other cases one may want to preserve the whitespace.
other cases one may want to preserve the whitespace.
This function returns the first index >= "start" where "target" can be found
This function returns the first index >= "start" where "target" can be found
within "source". Indices are 1-based. If "target" is not found, then this
within "source". Indices are 1-based. If "target" is not found, then this
function returns 0. If either "source" or "target" are missing / empty, this
function returns 0. If either "source" or "target" are missing / empty, this
function also returns 0.
function also returns 0.
]]
]]
function str.find( frame )
function str.find( frame )
local new_args = str._getParameters( frame.args, {'source', 'target', 'start', 'plain' } );
local source_str = new_args['source'] or '';
local pattern = new_args['target'] or '';
local start_pos = tonumber(new_args['start']) or 1;
local plain = new_args['plain'] or true;
if source_str == '' or pattern == '' then
return 0;
end
plain = str._getBoolean( plain );
local start = mw.ustring.find( source_str, pattern, start_pos, plain )
if start == nil then
start = 0
end
return start
end
end
count: The number of occurences to replace, defaults to all.
count: The number of occurences to replace, defaults to all.
plain: Boolean flag indicating that pattern should be understood as plain
plain: Boolean flag indicating that pattern should be understood as plain
text and not as a Lua style regular expression, defaults to true
text and not as a Lua style regular expression, defaults to true
]]
]]
function str.replace( frame )
function str.replace( frame )
local new_args = str._getParameters( frame.args, {'source', 'pattern', 'replace', 'count', 'plain' } );
local source_str = new_args['source'] or '';
local pattern = new_args['pattern'] or '';
local replace = new_args['replace'] or '';
local count = tonumber( new_args['count'] );
local plain = new_args['plain'] or true;
if source_str == '' or pattern == '' then
return source_str;
end
plain = str._getBoolean( plain );
if plain then
pattern = str._escapePattern( pattern );
replace = mw.ustring.gsub( replace, "%%", "%%%%" ); --Only need to escape replacement sequences.
end
local result;
if count ~= nil then
result = mw.ustring.gsub( source_str, pattern, replace, count );
else
result = mw.ustring.gsub( source_str, pattern, replace );
end
return result;
end
--[[
This function adds support for escaping parts of the patterns when using [plain=false].
]]
function str.escape( frame )
local new_args = str._getParameters( frame.args, {'pattern' } );
local pattern = new_args['pattern'] or '';
return result
local result = '';
result = str._escapePattern( pattern );
return result;
end
end
--[[
--[[
Internal compare string function
]]
]]
function str.rep( frame )
function str._strcmp(a , b)
local s1c = mw.ustring.gcodepoint( a );
local s2c = mw.ustring.gcodepoint( b );
while true do
local c1 = s1c();
local c2 = s2c();
if c1 == nil then
if c2 == nil then
return 0
else
return -1
end
else
if c2 ~= nil then
if c1 ~= c2 then
return c1 < c2 and -1 or 1
end
else
return 1
end
end
end
return 0
end
end
--[[
--[[
compare
This function compare two UTF-8 strings
Usage:
Usage:
{{#invoke:String|escapePattern|pattern_string}}
{{#invoke:String|compare|str1|str2}}
Returns:
0 - if strings are equal
1 - if st1 > str2
-1 - if str1 < str2
]]
]]
function str.escapePattern( frame )
function str.compare(frame)
local str1 = frame.args[1] or '';
local str2 = frame.args[2] or '';
return str._strcmp(str1 , str2)
end
end
--[[
--[[
simple function to pipe string.rep to templates.
]]
]]
function str.count(frame)
function str.rep( frame )
local repetitions = tonumber( frame.args[2] )
if not repetitions then
return str._error( 'функция rep ожидает число во втором параметре, а получено "' .. ( frame.args[2] or '' ) .. '"' )
end
return string.rep( frame.args[1] or '', repetitions )
]]
end
end
]]
]]
function str._getParameters( frame_args, arg_list )
function str._getParameters( frame_args, arg_list )
local new_args = {};
local index = 1;
local value;
for i,arg in ipairs( arg_list ) do
value = frame_args[arg]
if value == nil then
value = frame_args[index];
index = index + 1;
end
new_args[arg] = value;
end
return new_args;
end
end
--[[
--[[
]]
]]
function str._error( error_str )
function str._error( error_str )
local frame = mw.getCurrentFrame();
local error_category = frame.args.error_category or 'Страницы с ошибками модуля String';
local ignore_errors = frame.args.ignore_errors or false;
local no_category = frame.args.no_category or false;
if str._getBoolean(ignore_errors) then
return '';
end
local error_str = '<strong class="error">Ошибка модуля String: ' .. error_str .. '</strong>';
if error_category ~= '' and not str._getBoolean( no_category ) then
error_str = '[[Категория:' .. error_category .. ']]' .. error_str;
end
return error_str;
end
end
]]
]]
function str._getBoolean( boolean_str )
function str._getBoolean( boolean_str )
local boolean_value;
if type( boolean_str ) == 'string' then
boolean_str = boolean_str:lower();
if boolean_str == 'false' or boolean_str == 'no' or boolean_str == '0'
or boolean_str == '' then
boolean_value = false;
else
boolean_value = true;
end
elseif type( boolean_str ) == 'boolean' then
boolean_value = boolean_str;
else
error( 'Логическое значение не найдено' );
end
return boolean_value
end
end
--[[
--[[
Helper function that escapes all pattern characters so that they will be treated
Helper function that escapes all pattern characters so that they will be treated
as plain text.
as plain text.
]]
]]
function str._escapePattern( pattern_str )
function str._escapePattern( pattern_str )
return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" );
end
end
return str
return str