Tag: content model change |
|
| Line 42: |
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| | ]] | | ]] |
| | 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 |
| Line 71: |
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| | ]] | | ]] |
| | 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 |
| | | | |
| Line 107: |
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| | | | |
| | --[[ | | --[[ |
| − | _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}} |
| − | 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: |
| | | | |
| − | * http://www.lua.org/manual/5.1/manual.html#5.4.1 | + | * https://www.lua.org/manual/5.1/manual.html#5.4.1 |
| − | * http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns | + | * https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns |
| − | * http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Ustring_patterns | + | * https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Ustring_patterns |
| | | | |
| | ]] | | ]] |
| | -- This sub-routine is exported for use in other modules | | -- This sub-routine is exported for use in other modules |
| − | function str._match( s, pattern, start, match_index, plain_flag, nomatch ) | + | function str._match( s, pattern, start, match_index, plain, 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 | | 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._escapePattern( pattern ); |
| | end | | end |
| | | | |
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| | 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 |
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| | 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 | | 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 | | -- This is the entry point for #invoke:String|match |
| | function str.match( frame ) | | function str.match( frame ) |
| − | local new_args = str._getParameters( frame.args, {'s', 'pattern', 'start', 'match', 'plain', 'nomatch'} ) | + | local new_args = str._getParameters( frame.args, {'s', 'pattern', 'start', 'match', 'plain', 'nomatch'} ); |
| − | local s = new_args['s'] or '' | + | local s = new_args['s'] or ''; |
| − | local start = tonumber( new_args['start'] ) or 1 | + | local start = tonumber( new_args['start'] ) or 1; |
| − | local plain_flag = str._getBoolean( new_args['plain'] or false ) | + | local plain_flag = str._getBoolean( new_args['plain'] or false ); |
| − | local pattern = new_args['pattern'] or '' | + | local pattern = new_args['pattern'] or ''; |
| − | local match_index = math.floor( tonumber(new_args['match']) or 1 ) | + | local match_index = math.floor( tonumber(new_args['match']) or 1 ); |
| − | local nomatch = new_args['nomatch'] | + | local nomatch = new_args['nomatch']; |
| | | | |
| − | return str._match( s, pattern, start, match_index, plain_flag, nomatch ) | + | return str._match( s, pattern, start, match_index, plain, nomatch ) |
| | end | | end |
| | | | |
| Line 280: |
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| | ]] | | ]] |
| | 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 |
| | | | |
| Line 306: |
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| | ]] | | ]] |
| | 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 |
| | | | |
| Line 352: |
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| | ]] | | ]] |
| | function str.find( frame ) | | function str.find( frame ) |
| − | local new_args = str._getParameters( frame.args, {'source', 'target', 'start', 'plain' } ) | + | local new_args = str._getParameters( frame.args, {'source', 'target', 'start', 'plain' } ); |
| − | local source_str = new_args['source'] or '' | + | local source_str = new_args['source'] or ''; |
| − | local pattern = new_args['target'] or '' | + | local pattern = new_args['target'] or ''; |
| − | local start_pos = tonumber(new_args['start']) or 1 | + | local start_pos = tonumber(new_args['start']) or 1; |
| − | 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 0 | + | return 0; |
| | end | | end |
| | | | |
| − | plain = str._getBoolean( plain ) | + | plain = str._getBoolean( plain ); |
| | | | |
| | local start = mw.ustring.find( source_str, pattern, start_pos, plain ) | | local start = mw.ustring.find( source_str, pattern, start_pos, plain ) |
| Line 393: |
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| | ]] | | ]] |
| | 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._escapePattern( 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 | + | local result; |
| | | | |
| | if count ~= nil then | | if count ~= nil then |
| − | result = mw.ustring.gsub( source_str, pattern, replace, count ) | + | result = mw.ustring.gsub( source_str, pattern, replace, count ); |
| | else | | else |
| − | result = mw.ustring.gsub( source_str, pattern, replace ) | + | result = mw.ustring.gsub( source_str, pattern, replace ); |
| | end | | end |
| | | | |
| − | return result | + | return result; |
| | end | | end |
| | | | |
| Line 424: |
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| | simple function to pipe string.rep to templates. | | simple function to pipe string.rep to templates. |
| | ]] | | ]] |
| | + | |
| | function str.rep( frame ) | | function str.rep( frame ) |
| | local repetitions = tonumber( frame.args[2] ) | | local repetitions = tonumber( frame.args[2] ) |
| Line 449: |
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| | local pattern_str = frame.args[1] | | local pattern_str = frame.args[1] |
| | if not pattern_str then | | if not pattern_str then |
| − | return str._error( 'No pattern string specified' ) | + | return str._error( 'No pattern string specified' ); |
| | end | | end |
| | local result = str._escapePattern( pattern_str ) | | local result = str._escapePattern( pattern_str ) |
| | return result | | return result |
| − | end
| |
| − |
| |
| − | --[[
| |
| − | count
| |
| − | This function counts the number of occurrences of one string in another.
| |
| − | ]]
| |
| − | function str.count(frame)
| |
| − | local args = str._getParameters(frame.args, {'source', 'pattern', 'plain'})
| |
| − | local source = args.source or ''
| |
| − | local pattern = args.pattern or ''
| |
| − | 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 sep
| |
| − | for _, v in ipairs( frame.args ) do
| |
| − | if sep then
| |
| − | if v ~= '' then
| |
| − | table.insert(args, v)
| |
| − | end
| |
| − | else
| |
| − | sep = v
| |
| − | end
| |
| − | end
| |
| − | return table.concat( args, sep or '' )
| |
| | end | | end |
| | | | |
| Line 519: |
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| | ]] | | ]] |
| | 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 i,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 |
| | | | |
| Line 539: |
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| | ]] | | ]] |
| | 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 |
| | | | |
| Line 560: |
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| | ]] | | ]] |
| | 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 583: |
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| | ]] | | ]] |
| | function str._escapePattern( pattern_str ) | | function str._escapePattern( pattern_str ) |
| − | return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" ) | + | return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" ); |
| | end | | end |
| | | | |
| | return str | | return str |
--[[
This module is intended to provide access to basic string functions.
Most of the functions provided here can be invoked with named parameters,
unnamed parameters, or a mixture. If named parameters are used, Mediawiki will
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
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
include with the error message. The default category is
[Category:Errors reported by Module String].
no_category: If set to 'true' or 1, no category will be added if an error
is generated.
Unit tests for this module are available at Module:String/tests.
]]
local str = {}
--[[
len
This function returns the length of the target string.
Usage:
{{#invoke:String|len|target_string|}}
OR
{{#invoke:String|len|s=target_string}}
Parameters
s: The string whose length to report
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the target string.
]]
function str.len( frame )
local new_args = str._getParameters( frame.args, {'s'} );
local s = new_args['s'] or '';
return mw.ustring.len( s )
end
--[[
sub
This function returns a substring of the target string at specified indices.
Usage:
{{#invoke:String|sub|target_string|start_index|end_index}}
OR
{{#invoke:String|sub|s=target_string|i=start_index|j=end_index}}
Parameters
s: The string to return a subset of
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.
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
counting from the end of the string. Hence, a value of -1 is the same as
selecting the last character of the string.
If the requested indices are out of range for the given string, an error is
reported.
]]
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( 'String subset index out of range' );
end
if j < i then
return str._error( 'String subset indices out of order' );
end
return mw.ustring.sub( s, i, j )
end
--[[
This function implements that features of {{str sub old}} and is kept in order
to maintain these older templates.
]]
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
--[[
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}}
OR
{{#invoke:String|pos|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:
* https://www.lua.org/manual/5.1/manual.html#5.4.1
* https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns
* https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Ustring_patterns
]]
-- This sub-routine is exported for use in other modules
function str._match( s, pattern, start, match_index, plain, nomatch )
if s == '' then
return str._error( 'Target string is empty' );
end
if pattern == '' then
return str._error( 'Pattern string is empty' );
end
start = tonumber(start) or 1
if math.abs(start) < 1 or math.abs(start) > mw.ustring.len( s ) then
return str._error( 'Requested start is out of range' );
end
if match_index == 0 then
return str._error( 'Match index is out of range' );
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( 'Match not found' );
else
return nomatch;
end
else
return result;
end
end
-- 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, nomatch )
end
--[[
pos
This function returns a single character from the target string at position pos.
Usage:
{{#invoke:String|pos|target_string|index_value}}
OR
{{#invoke:String|pos|target=target_string|pos=index_value}}
Parameters
target: The string to search
pos: The index for the character to return
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
other cases one may want to preserve the whitespace.
The first character has an index value of 1.
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.
A requested value of zero, or a value greater than the length of the string returns an error.
]]
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( 'String index out of range' );
end
return mw.ustring.sub( target_str, pos, pos );
end
--[[
str_find
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
new code and templates. New code is recommended to use the "find" function instead.
Returns the first index in "source" that is a match to "target". Indexing is 1-based,
and the function returns -1 if the "target" string is not present in "source".
Important Note: If the "target" string is empty / missing, this function returns a
value of "1", which is generally unexpected behavior, and must be accounted for
separatetly.
]]
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
--[[
find
This function allows one to search for a target string or pattern within another
string.
Usage:
{{#invoke:String|find|source_str|target_string|start_index|plain_flag}}
OR
{{#invoke:String|find|source=source_str|target=target_str|start=start_index|plain=plain_flag}}
Parameters
source: The string to search
target: The string or pattern to find within source
start: The index within the source string to start the search, defaults to 1
plain: Boolean flag indicating that target should be understood as plain
text and not as a Lua style regular expression, defaults to true
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the parameter. In some circumstances this is desirable, in
other cases one may want to preserve the whitespace.
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
function returns 0. If either "source" or "target" are missing / empty, this
function also returns 0.
This function should be safe for UTF-8 strings.
]]
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
--[[
replace
This function allows one to replace a target string or pattern within another
string.
Usage:
{{#invoke:String|replace|source_str|pattern_string|replace_string|replacement_count|plain_flag}}
OR
{{#invoke:String|replace|source=source_string|pattern=pattern_string|replace=replace_string|
count=replacement_count|plain=plain_flag}}
Parameters
source: The string to search
pattern: The string or pattern to find within source
replace: The replacement text
count: The number of occurences to replace, defaults to all.
plain: Boolean flag indicating that pattern should be understood as plain
text and not as a Lua style regular expression, defaults to true
]]
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
--[[
simple function to pipe string.rep to templates.
]]
function str.rep( frame )
local repetitions = tonumber( frame.args[2] )
if not repetitions then
return str._error( 'function rep expects a number as second parameter, received "' .. ( frame.args[2] or '' ) .. '"' )
end
return string.rep( frame.args[1] or '', repetitions )
end
--[[
escapePattern
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
Usage:
{{#invoke:String|escapePattern|pattern_string}}
Parameters
pattern_string: The pattern string to escape.
]]
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
--[[
Helper function that populates the argument list given that user may need to use a mix of
named and unnamed parameters. This is relevant because named parameters are not
identical to unnamed parameters due to string trimming, and when dealing with strings
we sometimes want to either preserve or remove that whitespace depending on the application.
]]
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
--[[
Helper function to handle error messages.
]]
function str._error( error_str )
local frame = mw.getCurrentFrame();
local error_category = frame.args.error_category or 'Errors reported by Module 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">String Module Error: ' .. error_str .. '</strong>';
if error_category ~= '' and not str._getBoolean( no_category ) then
error_str = '[[Category:' .. error_category .. ']]' .. error_str;
end
return error_str;
end
--[[
Helper Function to interpret boolean strings
]]
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( 'No boolean value found' );
end
return boolean_value
end
--[[
Helper function that escapes all pattern characters so that they will be treated
as plain text.
]]
function str._escapePattern( pattern_str )
return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" );
end
return str
