Module:String: Difference between revisions

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Module:String (edit)

Revision as of 13:04, 4 January 2022

1,966 bytes added ,  2 years ago
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(separate annotations for str.match from those for str._match)
 
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--[[
local str = {}


This module is intended to provide access to basic string functions.
-- Cannot include null byte.
local UTF8_char = "[\1-\127\194-\244][\128-\191]*"


Most of the functions provided here can be invoked with named parameters,
--[[
unnamed parameters, or a mixture.  If named parameters are used, Mediawiki will
ulen
automatically remove any leading or trailing whitespace from the parameter.
Depending on the intended use, it may be advantageous to either preserve or
remove such whitespace.


Global options
Counts UTF-8 characters. Faster than mw.ustring.len.
    ignore_errors: If set to 'true' or 1, any error condition will result in
        an empty string being returned rather than an error message.


    error_category: If an error occurs, specifies the name of a category to
Assumes that the encoding is correct. Unlike mw.ustring.len, does not return nil
        include with the error message.  The default category is
if encoding is invalid.
        [Category:Errors reported by Module String].


    no_category: If set to 'true' or 1, no category will be added if an error
Does not count the bytes 192, 193, and 245-255. They are not used in UTF-8 and
        is generated.
will not occur if the string is valid. They are replaced with the replacement
 
character (U+FFFD) on MediaWiki pages.
Unit tests for this module are available at Module:String/tests.
--]]
]]
function str.ulen(text)
 
local _, length = string.gsub(text, UTF8_char, "")
local str = {}
return length
end


--[[
--[[
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Usage:
Usage:
{{#invoke:String|len|target_string|}}
{{#invoke:string|len|target_string|}}
OR
OR
{{#invoke:String|len|s=target_string}}
{{#invoke:string|len|s=target_string}}


Parameters
Parameters
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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 new_args = str._getParameters(frame.args, { 's' });
local s = new_args['s'] or ''
local s = new_args['s'] or '';
return mw.ustring.len( s )
return mw.ustring.len(s)
end
end


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Usage:
Usage:
{{#invoke:String|sub|target_string|start_index|end_index}}
{{#invoke:string|sub|target_string|start_index|end_index}}
OR
OR
{{#invoke:String|sub|s=target_string|i=start_index|j=end_index}}
{{#invoke:string|sub|s=target_string|i=start_index|j=end_index}}


Parameters
Parameters
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     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
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reported.
reported.
]]
]]
function str.sub( frame )
function str.sub(frame)
local new_args = str._getParameters( frame.args, { 's', 'i', 'j' } )
local new_args = str._getParameters(frame.args, { 's', 'i', 'j' });
local s = new_args['s'] or ''
local s = new_args['s'] or '';
local i = tonumber( new_args['i'] ) or 1
local i = tonumber(new_args['i']) or 1;
local j = tonumber( new_args['j'] ) or -1
local j = tonumber(new_args['j']) or -1;
 
local len = mw.ustring.len( s )
local len = mw.ustring.len(s);
 
-- Convert negatives for range checking
-- Convert negatives for range checking
if i < 0 then
if i < 0 then
i = len + i + 1
i = len + i + 1;
end
end
if j < 0 then
if j < 0 then
j = len + j + 1
j = len + j + 1;
end
end
 
if i > len or j > len or i < 1 or j < 1 then
if i > len or j > len or i < 1 or j < 1 then
return str._error( 'String subset index out of range' )
return str._error('String subset index out of range');
end
end
if j < i then
if j < i then
return str._error( 'String subset indices out of order' )
return str._error('String subset indices out of order');
end
end
 
return mw.ustring.sub( s, i, j )
return mw.ustring.sub(s, i, j)
end
end


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to maintain these older templates.
to maintain these older templates.
]]
]]
function str.sublength( frame )
function str.sublength(frame)
local i = tonumber( frame.args.i ) or 0
local i = tonumber(frame.args.i) or 0
local len = tonumber( frame.args.len )
local len = tonumber(frame.args.len)
return mw.ustring.sub( frame.args.s, i + 1, len and ( i + 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. It is exported for use in other modules
specified pattern.


Usage:
Usage:
strmatch = require("Module:String")._match
{{#invoke:string|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
sresult = strmatch( s, pattern, start, match, plain, nomatch )
OR
{{#invoke:string|pos|s=source_string|pattern=pattern_string|start=start_index
    |match=match_number|plain=plain_flag|nomatch=nomatch_output}}


Parameters
Parameters
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         text.  Defaults to false.
         text.  Defaults to false.
     nomatch: If no match is found, output the "nomatch" value rather than an error.
     nomatch: If no match is found, output the "nomatch" value rather than an error.
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from each string.  In some circumstances this is desirable, in
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
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
an empty string will be returned on any failure.


For information on constructing Lua patterns, a form of [regular expression], see:
For information on constructing Lua patterns, a form of [regular expression], see:
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]]
]]
-- This sub-routine is exported for use in other modules
function str.match(frame)
function str._match( s, pattern, start, match_index, plain_flag, nomatch )
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
if s == '' then
return str._error( 'Target string is empty' )
return str._error('Target string is empty');
end
end
if pattern == '' then
if pattern == '' then
return str._error( 'Pattern string is empty' )
return str._error('Pattern string is empty');
end
end
start = tonumber(start) or 1
if math.abs(start) < 1 or math.abs(start) > mw.ustring.len(s) then
if math.abs(start) < 1 or math.abs(start) > mw.ustring.len( s ) then
return str._error('Requested start is out of range');
return str._error( 'Requested start is out of range' )
end
end
if match_index == 0 then
if match_index == 0 then
return str._error( 'Match index is out of range' )
return str._error('Match index is out of range');
end
end
if plain_flag then
if plain_flag then
pattern = str._escapePattern( pattern )
pattern = str.pattern_escape(pattern);
end
end
 
local result
local result
if match_index == 1 then
if match_index == 1 then
-- Find first match is simple case
-- Find first match is simple case
result = mw.ustring.match( s, pattern, start )
result = mw.ustring.match(s, pattern, start)
else
else
if start > 1 then
if start > 1 then
s = mw.ustring.sub( s, start )
s = mw.ustring.sub(s, start);
end
end
 
local iterator = mw.ustring.gmatch(s, pattern)
local iterator = mw.ustring.gmatch(s, pattern);
if match_index > 0 then
if match_index > 0 then
-- Forward search
-- Forward search
for w in iterator do
for w in iterator do
match_index = match_index - 1
match_index = match_index - 1;
if match_index == 0 then
if match_index == 0 then
result = w
result = w;
break
break;
end
end
end
end
else
else
-- Reverse search
-- Reverse search
local result_table = {}
local result_table = {};
local count = 1
local count = 1;
for w in iterator do
for w in iterator do
result_table[count] = w
result_table[count] = w;
count = count + 1
count = count + 1;
end
end
 
result = result_table[ count + match_index ]
result = result_table[count + match_index];
end
end
end
end
 
if result == nil then
if result == nil then
if nomatch == nil then
if nomatch == nil then
return str._error( 'Match not found' )
return str._error('Match not found');
else
else
return nomatch
return nomatch;
end
end
else
else
return result
return result;
end
end
end
--[[
match
This function returns a substring from the source string that matches a
specified pattern.
Usage:
{{#invoke:String|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
OR
{{#invoke:String|match|s=source_string|pattern=pattern_string|start=start_index
    |match=match_number|plain=plain_flag|nomatch=nomatch_output}}
Parameters
    s: The string to search
    pattern: The pattern or string to find within the string
    start: The index within the source string to start the search.  The first
        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
        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
        counting from the last match.  Hence match = -1 is the same as requesting
        the last match.  Defaults to 1.
    plain: A flag indicating that the pattern should be understood as plain
        text.  Defaults to false.
    nomatch: If no match is found, output the "nomatch" value rather than an error.
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from each string.  In some circumstances this is desirable, in
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
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
an empty string will be returned on any failure.
For information on constructing Lua patterns, a form of [regular expression], see:
* http://www.lua.org/manual/5.1/manual.html#5.4.1
* http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns
* http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Ustring_patterns
]]
-- This is the entry point for #invoke:String|match
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']
return str._match( s, pattern, start, match_index, plain_flag, nomatch )
end
end


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Usage:
Usage:
{{#invoke:String|pos|target_string|index_value}}
{{#invoke:string|pos|target_string|index_value}}
OR
OR
{{#invoke:String|pos|target=target_string|pos=index_value}}
{{#invoke:string|pos|target=target_string|pos=index_value}}


Parameters
Parameters
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A requested value of zero, or a value greater than the length of the string returns an error.
A requested value of zero, or a value greater than the length of the string returns an error.
]]
]]
function str.pos( frame )
function str.pos(frame)
local new_args = str._getParameters( frame.args, {'target', 'pos'} )
local new_args = str._getParameters(frame.args, { 'target', 'pos' });
local target_str = new_args['target'] or ''
local target_str = new_args['target'] or '';
local pos = tonumber( new_args['pos'] ) or 0
local pos = tonumber(new_args['pos']) or 0;
 
if pos == 0 or math.abs(pos) > mw.ustring.len( target_str ) then
if pos == 0 or math.abs(pos) > mw.ustring.len(target_str) then
return str._error( 'String index out of range' )
return str._error('String index out of range');
end
end
 
return mw.ustring.sub( target_str, pos, pos )
return mw.ustring.sub(target_str, pos, pos);
end
end


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separatetly.
separatetly.
]]
]]
function str.str_find( frame )
function str.str_find(frame)
local new_args = str._getParameters( frame.args, {'source', 'target'} )
local new_args = str._getParameters(frame.args, { 'source', 'target' });
local source_str = new_args['source'] or ''
local source_str = new_args['source'] or '';
local target_str = new_args['target'] or ''
local target_str = new_args['target'] or '';
 
if target_str == '' then
if target_str == '' then
return 1
return 1;
end
end
 
local start = mw.ustring.find( source_str, target_str, 1, true )
local start = mw.ustring.find(source_str, target_str, 1, true)
if start == nil then
if start == nil then
start = -1
start = -1
end
end
 
return start
return start
end
end
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Usage:
Usage:
{{#invoke:String|find|source_str|target_string|start_index|plain_flag}}
{{#invoke:string|find|source_str|target_string|start_index|plain_flag}}
OR
OR
{{#invoke:String|find|source=source_str|target=target_str|start=start_index|plain=plain_flag}}
{{#invoke:string|find|source=source_str|target=target_str|start=start_index|plain=plain_flag}}


Parameters
Parameters
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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 an empty string.  If either "source" or "target" are missing / empty, this
function also returns 0.
function also returns an empty string.


This function should be safe for UTF-8 strings.
This function should be safe for UTF-8 strings.
]]
]]
function str.find( frame )
function str.find(frame)
local new_args = str._getParameters( frame.args, {'source', 'target', 'start', 'plain' } )
local params = {
local source_str = new_args['source'] or ''
[1] = { required = true, allow_empty = true },
local pattern = new_args['target'] or ''
[2] = { required = true, allow_empty = true },
local start_pos = tonumber(new_args['start']) or 1
[3] = { type = "number" },
local plain = new_args['plain'] or true
[4] = { type = "boolean" },
 
}
if source_str == '' or pattern == '' then
return 0
local args = require("Module:parameters").process(frame.args, params)
end
 
return mw.ustring.find(args[1], args[2], args[3], args[4])
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


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Usage:
Usage:
{{#invoke:String|replace|source_str|pattern_string|replace_string|replacement_count|plain_flag}}
{{#invoke:string|replace|source_str|pattern_string|replace_string|replacement_count|plain_flag}}
OR
OR
{{#invoke:String|replace|source=source_string|pattern=pattern_string|replace=replace_string|
{{#invoke:string|replace|source=source_string|pattern=pattern_string|replace=replace_string|
   count=replacement_count|plain=plain_flag}}
   count=replacement_count|plain=plain_flag}}


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         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 new_args = str._getParameters(frame.args, { 'source', 'pattern', 'replace', 'count', 'plain' });
local source_str = new_args['source'] or ''
local source_str = new_args['source'] or '';
local pattern = new_args['pattern'] or ''
local pattern = new_args['pattern'] or '';
local replace = new_args['replace'] or ''
local replace = new_args['replace'] or '';
local count = tonumber( new_args['count'] )
local count = tonumber(new_args['count']);
local plain = new_args['plain'] or true
local plain = new_args['plain'] or true;
 
if source_str == '' or pattern == '' then
if source_str == '' or pattern == '' then
return source_str
return source_str;
end
end
plain = str._getBoolean( plain )
plain = str._getBoolean(plain);
 
if plain then
if plain then
pattern = str._escapePattern( pattern )
pattern = str.pattern_escape(pattern);
replace = mw.ustring.gsub( replace, "%%", "%%%%" ) --Only need to escape replacement sequences.
replace = mw.ustring.gsub(replace, "%%", "%%%%"); --Only need to escape replacement sequences.
end
end
local result;
result = mw.ustring.gsub(source_str, pattern, replace, count);
return result;
end


local result


if count ~= nil then
function str.gsub(frame)
result = mw.ustring.gsub( source_str, pattern, replace, count )
local params = {
else
[1] = { required = true, allow_empty = true, allow_whitespace = true},
result = mw.ustring.gsub( source_str, pattern, replace )
[2] = { required = true, allow_empty = true, allow_whitespace = true},
end
[3] = { required = true, allow_empty = true, allow_whitespace = true},
[4] = { type = "number" },
}
local args = require("Module:parameters").process(frame.args, params)
return (mw.ustring.gsub(args[1], args[2], args[3], args[4]))
end


return result
end


--[[
--[[
     simple function to pipe string.rep to templates.
     simple function to pipe string.rep to templates.
]]
]]
function str.rep( frame )
 
local repetitions = tonumber( frame.args[2] )
function str.rep(frame)
local repetitions = tonumber(frame.args[2])
if not repetitions then
if not repetitions then
return str._error( 'function rep expects a number as second parameter, received "' .. ( frame.args[2] or '' ) .. '"' )
return str._error('function rep expects a number as second parameter, received "' .. (frame.args[2] or '') .. '"')
end
end
return string.rep( frame.args[1] or '', repetitions )
return string.rep(frame.args[1] or '', repetitions)
end
 
function str.lower(frame)
local text = frame.args[1] or ''
return mw.ustring.lower(text)
end
end
str.lc = str.lower


--[[
--[[
escapePattern
format
 
This function escapes special characters from a Lua string pattern. See [1]
for details on how patterns work.


[1] https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns
This function allows one to format strings according to a template. This is a direct interface onto
str.format() in Lua, and works like the C printf() function.


Usage:
For example:
{{#invoke:String|escapePattern|pattern_string}}
{{#invoke:string|format|page_%04d.html|65}}
will produce the result
page_0065.html


Parameters
Parameters
     pattern_string: The pattern string to escape.
     1: The format template. See https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#string.format
]]
    2, 3, ...: Arguments to be inserted into the template.
function str.escapePattern( frame )
local pattern_str = frame.args[1]
if not pattern_str then
return str._error( 'No pattern string specified' )
end
local result = str._escapePattern( pattern_str )
return result
end


--[[
Note that leading and trailing whitespace is not removed from the arguments.
count
This function counts the number of occurrences of one string in another.
]]
]]
function str.count(frame)
function str.format(frame)
local args = str._getParameters(frame.args, {'source', 'pattern', 'plain'})
local fmt = frame.args[1]
local source = args.source or ''
-- You can't call unpack() directly on frame.args because it isn't really a
local pattern = args.pattern or ''
-- table, and doesn't support the # operator.
local plain = str._getBoolean(args.plain or true)
if plain then
pattern = str._escapePattern(pattern)
end
local _, count = mw.ustring.gsub(source, pattern, '')
return count
end
 
--[[
endswith
This function determines whether a string ends with another string.
]]
function str.endswith(frame)
local args = str._getParameters(frame.args, {'source', 'pattern'})
local source = args.source or ''
local pattern = args.pattern or ''
if pattern == '' then
-- All strings end with the empty string.
return "yes"
end
if mw.ustring.sub(source, -mw.ustring.len(pattern), -1) == pattern then
return "yes"
else
return ""
end
end
 
--[[
join
 
Join all non empty arguments together; the first argument is the separator.
Usage:
{{#invoke:String|join|sep|one|two|three}}
]]
function str.join(frame)
local args = {}
local args = {}
local sep
local i = 2
for _, v in ipairs( frame.args ) do
while true do
if sep then
local val = frame.args[i]
if v ~= '' then
if not val then
table.insert(args, v)
break
end
else
sep = v
end
end
table.insert(args, val)
i = i + 1
end
end
return table.concat( args, sep or '' )
return fmt:format(unpack(args))
end
end


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we sometimes want to either preserve or remove that whitespace depending on the application.
we sometimes want to either preserve or remove that whitespace depending on the application.
]]
]]
function str._getParameters( frame_args, arg_list )
function str._getParameters(frame_args, arg_list)
local new_args = {}
local new_args = {};
local index = 1
local index = 1;
local value
local value;
 
for _, arg in ipairs( arg_list ) do
for _, arg in ipairs(arg_list) do
value = frame_args[arg]
value = frame_args[arg]
if value == nil then
if value == nil then
value = frame_args[index]
value = frame_args[index];
index = index + 1
index = index + 1;
end
end
new_args[arg] = value
new_args[arg] = value;
end
end
 
return new_args
return new_args;
end
end


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Helper function to handle error messages.
Helper function to handle error messages.
]]
]]
function str._error( error_str )
function str._error(error_str)
local frame = mw.getCurrentFrame()
local frame = mw.getCurrentFrame();
local error_category = frame.args.error_category or 'Errors reported by Module String'
local error_category = frame.args.error_category or 'Errors reported by Module String';
local ignore_errors = frame.args.ignore_errors or false
local ignore_errors = frame.args.ignore_errors or false;
local no_category = frame.args.no_category or false
local no_category = frame.args.no_category or false;
 
if str._getBoolean(ignore_errors) then
if str._getBoolean(ignore_errors) then
return ''
return '';
end
end
 
local error_str = '<strong class="error">String Module Error: ' .. error_str .. '</strong>'
local error_str = '<strong class="error">String Module Error: ' .. error_str .. '</strong>';
if error_category ~= '' and not str._getBoolean( no_category ) then
if error_category ~= '' and not str._getBoolean(no_category) then
error_str = '[[Category:' .. error_category .. ']]' .. error_str
error_str = '[[Category:' .. error_category .. ']]' .. error_str;
end
end
 
return error_str
return error_str;
end
end


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Helper Function to interpret boolean strings
Helper Function to interpret boolean strings
]]
]]
function str._getBoolean( boolean_str )
function str._getBoolean(boolean_str)
local boolean_value
local boolean_value;
 
if type( boolean_str ) == 'string' then
if type(boolean_str) == 'string' then
boolean_str = boolean_str:lower()
boolean_str = boolean_str:lower();
if boolean_str == 'false' or boolean_str == 'no' or boolean_str == '0'
if boolean_str == 'false' or boolean_str == 'no' or boolean_str == '0'
or boolean_str == '' then
or boolean_str == '' then
boolean_value = false
boolean_value = false;
else
else
boolean_value = true
boolean_value = true;
end
end
elseif type( boolean_str ) == 'boolean' then
elseif type(boolean_str) == 'boolean' then
boolean_value = boolean_str
boolean_value = boolean_str;
else
else
error( 'No boolean value found' )
error('No boolean value found');
end
end
return boolean_value
return boolean_value
Line 579: Line 502:


--[[
--[[
Helper function that escapes all pattern characters so that they will be treated
Helper function that escapes all pattern characters – ().%+-*?[^$] – so that they will be treated
as plain text.
as plain text.
]]
]]
function str._escapePattern( pattern_str )
function str.pattern_escape(pattern_str)
return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" )
local invoked = false
local escape = require("Module:string/pattern_escape")
if type(pattern_str) == "table" then
if pattern_str.args then
local frame = pattern_str
invoked = true
if frame.args[1] then
pattern_str = frame.args[1]
else
pattern_str = frame:getParent().args[1]
end
else
error("First argument to pattern_escape should be a string, a number, or a frame object.")
end
elseif not (type(pattern_str) == "string" or type(pattern_str) == "number") then
error("First argument to pattern_escape should be a string or a number.")
end
if invoked then
return (escape(pattern_str)) -- only the first value
else
return escape(pattern_str)
end
end
 
function str.count(text, pattern, plain)
if not (type(text) == "string" or type(text) == "number") then
error('The first argument to the function "count" must be a string or a number, not a ' .. type(text) .. '.')
end
if not (type(pattern) == "string" or type(pattern) == "number") then
error('The first argument to the function "count" must be a string or a number, not a ' .. type(text) .. '.')
end
if plain then
pattern = str.pattern_escape(pattern)
end
local _, count = mw.ustring.gsub(text, pattern, "")
return count
end
 
function str.plain_gsub(text, pattern, replacement)
local invoked = false
if type(text) == "table" then
invoked = true
if text.args then
local frame = text
local params = {
[1] = {},
[2] = {},
[3] = { allow_empty = true },
}
local args = require("Module:parameters").process(frame.args, params)
text = args[1]
pattern = args[2]
replacement = args[3]
else
error("If the first argument to plain_gsub is a table, it should be a frame object.")
end
else
if not (type(pattern) == "string" or type(pattern) == "number") then
error("The second argument to plain_gsub should be a string or a number.")
end
if not (type(replacement) == "string" or type(replacement) == "number") then
error("The third argument to plain_gsub should be a string or a number.")
end
end
pattern = str.pattern_escape(pattern)
if invoked then
text = mw.ustring.gsub(text, pattern, replacement)
return text
else
return mw.ustring.gsub(text, pattern, replacement)
end
end
 
function str.matchToArray(text, pattern)
local invoked = false
if type(text) == "table" then
invoked = true
if text.args then
local frame = text
local params = {
[1] = { required = true },
[2] = { required = true },
}
local args = require("Module:parameters").process(frame.args, params)
text = args[1]
pattern = args[2]
else
error("If the first argument to matchToArray is a table, it should be a frame object.")
end
else
if not (type(pattern) == "string" or type(pattern) == "number") then
error("The second argument to matchToArray should be a string or a number.")
end
end
local matches = {}
local i = 0
for match in mw.ustring.gmatch(text, pattern) do
i = i + 1
matches[i] = match
end
if i > 0 then
if invoked then
return table.concat(matches, ", ")
else
return matches
end
else
if invoked then
return ""
else
return nil
end
end
end
 
--[=[
Similar to gmatch, but it returns the count of the match in addition to the
list of captures, something like ipairs().
If the pattern doesn't contain any captures, the whole match is returned.
Invoke thus:
for i, whole_match in require("Module:string").imatch(text, pattern) do
[ do something with i and whole_match ]
end
or
for i, capture1[, capture2[, capture3[, ...]]] in require("Module:string").imatch(text, pattern) do
[ do something with i and capture1 ]
end
For example, this code
for i, whole_match in require("Module:string").imatch("a b c", "[a-z]") do
mw.log(i, whole_match)
end
will log
1 a
2 b
3 c
]=]
function str.imatch(text, pattern, pos, plain, use_basic_Lua_function)
local i = 0
pos = pos or 0
if not string.find(pattern, "%b()") then
pattern = "(" .. pattern .. ")"
end
local find = use_basic_Lua_function and string.find or mw.ustring.find
return function()
i = i + 1
local return_values = { find(text, pattern, pos, plain) }
local j = return_values[2]
if return_values[3] then
pos = j + 1
-- Skip the first two returned values, which are the indices of the
-- whole match.
return i, unpack(return_values, 3)
end
end
end
 
function str.escapebytes(s)
return (string.gsub(s,
'.',
function(char)
return ('\\%03d'):format(string.byte(char))
end))
end
 
function str.URIdecode(frame)
return mw.uri.decode(frame.args[1], frame.args[2] or "PATH")
end
end


return str
return str
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