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Module:String: Difference between revisions

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Module:String (view source)

Revision as of 20:16, 4 December 2021

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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.
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Parameters
Parameters
s: The string whose length to report
    s: The string whose length to report


If invoked using named parameters, Mediawiki will automatically remove any leading or
If invoked using named parameters, Mediawiki will automatically remove any leading or
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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
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Parameters
Parameters
s: The string to return a subset of
    s: The string to return a subset of
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
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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


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Usage:
Usage:
{{#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}}
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}}


Parameters
Parameters
s: The string to search
    s: The string to search
pattern: The pattern or string to find within the string
    pattern: The pattern or string to find within the string
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.
plain: A flag indicating that the pattern should be understood as plain
    plain: A flag indicating that the pattern should be understood as plain
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
If invoked using named parameters, Mediawiki will automatically remove any leading or
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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
-- 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


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Parameters
Parameters
target: The string to search
    target: The string to search
pos: The index for the character to return
    pos: The index for the character to return


If invoked using named parameters, Mediawiki will automatically remove any leading or
If invoked using named parameters, Mediawiki will automatically remove any leading or
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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


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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


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Parameters
Parameters
source: The string to search
    source: The string to search
target: The string or pattern to find within source
    target: The string or pattern to find within source
start: The index within the source string to start the search, defaults to 1
    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
    plain: Boolean flag indicating that target 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


If invoked using named parameters, Mediawiki will automatically remove any leading or
If invoked using named parameters, Mediawiki will automatically remove any leading or
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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 )
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Parameters
Parameters
source: The string to search
    source: The string to search
pattern: The string or pattern to find within source
    pattern: The string or pattern to find within source
replace: The replacement text
    replace: The replacement text
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 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


--[[
--[[
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] )
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Parameters
Parameters
pattern_string: The pattern string to escape.
    pattern_string: The pattern string to escape.
]]
]]
function str.escapePattern( frame )
function str.escapePattern( frame )
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


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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


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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


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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
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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
 
--[[
check if string is a number
]]
function str.isNumber( frame )
if not tonumber( frame.args[1] ) then
return 0
else
return 1
end
end
end


return str
return str
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