NARA

Module:String: Difference between revisions

Module Discussion

Module:String (view source)

Revision as of 02:56, 17 August 2020

2,561 bytes removed ,  17 August 2020
remove seemingly unnecessary letter
NARA>RexxS
(separate annotations for str.match from those for str._match)
 
NARA>Amire80
(remove seemingly unnecessary letter)
Line 42: Line 42:
]]
]]
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: Line 71:
]]
]]
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: Line 107:


--[[
--[[
_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
Line 129: Line 131:
         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


Line 162: Line 173:
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
Line 190: Line 201:
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: Line 248:
]]
]]
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: Line 274:
]]
]]
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: Line 320:
]]
]]
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: Line 361:
]]
]]
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: Line 392:
     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: Line 418:
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: Line 431:
]]
]]
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: Line 451:
]]
]]
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: Line 472:
]]
]]
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: Line 495:
]]
]]
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
Anonymous user
Retrieved from "https://nara.vindexcraft.net/index.php?title=Special:MobileDiff/233"