Відмінності між версіями «Модуль:String»

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Рядок 1: Рядок 1:
--[[
+
--[[
   
 
This module is intended to provide access to basic string functions.
 
This module is intended to provide access to basic string functions.
   
Most of the functions provided here can be invoked with named parameters,
+
Most of the functions provided here can be invoked with named parameters,
unnamed parameters, or a mixture. If named parameters are used, Mediawiki will
+
unnamed parameters, or a mixture. If named parameters are used, Mediawiki will
automatically remove any leading or trailing whitespace from the parameter.
+
automatically remove any leading or trailing whitespace from the parameter.
 
Depending on the intended use, it may be advantageous to either preserve or
 
Depending on the intended use, it may be advantageous to either preserve or
 
remove such whitespace.
 
remove such whitespace.
   
 
Global options
 
Global options
ignore_errors: If set to 'true' or 1, any error condition will result in
+
ignore_errors: If set to 'true' or 1, any error condition will result in
an empty string being returned rather than an error message.
+
an empty string being returned rather than an error message.
  +
 
error_category: If an error occurs, specifies the name of a category to
+
error_category: If an error occurs, specifies the name of a category to
include with the error message. The default category is
+
include with the error message. The default category is
 
[Category:Errors reported by Module String].
 
[Category:Errors reported by Module String].
  +
 
 
no_category: If set to 'true' or 1, no category will be added if an error
 
no_category: If set to 'true' or 1, no category will be added if an error
 
is generated.
 
is generated.
  +
 
 
Unit tests for this module are available at Module:String/tests.
 
Unit tests for this module are available at Module:String/tests.
 
]]
 
]]
Рядок 39: Рядок 39:
   
 
If invoked using named parameters, Mediawiki will automatically remove any leading or
 
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the target string.
+
trailing whitespace from the target string.
 
]]
 
]]
 
function str.len( frame )
 
function str.len( frame )
local new_args = str._getParameters( frame.args, {'s'} );
+
local 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
   
Рядок 61: Рядок 61:
 
i: The first index of the substring to return, defaults to 1.
 
i: The first index of the substring to return, defaults to 1.
 
j: The last index of the string to return, defaults to the last character.
 
j: The last index of the string to return, defaults to the last character.
  +
 
 
The first character of the string is assigned an index of 1. If either i or j
 
The first character of the string is assigned an index of 1. If either i or j
is a negative value, it is interpreted the same as selecting a character by
+
is a negative value, it is interpreted the same as selecting a character by
counting from the end of the string. Hence, a value of -1 is the same as
+
counting from the end of the string. Hence, a value of -1 is the same as
 
selecting the last character of the string.
 
selecting the last character of the string.
   
If the requested indices are out of range for the given string, an error is
+
If the requested indices are out of range for the given string, an error is
 
reported.
 
reported.
 
]]
 
]]
 
function str.sub( frame )
 
function str.sub( frame )
local new_args = str._getParameters( frame.args, { 's', 'i', 'j' } );
+
local 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
 
  +
if i < 0 then
 
  +
-- Convert negatives for range checking
i = len + i + 1;
 
end
+
if i < 0 then
if j < 0 then
+
i = len + i + 1
  +
end
j = len + j + 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' );
 
  +
if i > len or j > len or i < 1 or j < 1 then
end
 
  +
return str._error( 'String subset index out of range' )
if j < i then
 
  +
end
return str._error( 'String subset indices out of order' );
 
end
+
if j < i then
  +
return str._error( 'String subset indices out of order' )
 
  +
end
return mw.ustring.sub( s, i, j )
 
  +
  +
return mw.ustring.sub( s, i, j )
 
end
 
end
   
Рядок 101: Рядок 101:
 
]]
 
]]
 
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
   
Рядок 109: Рядок 109:
 
match
 
match
   
This function returns a substring from the source string that matches a
+
This function returns a substring from the source string that matches a
 
specified pattern.
 
specified pattern.
   
Рядок 115: Рядок 115:
 
{{#invoke:String|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
 
{{#invoke:String|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
 
OR
 
OR
{{#invoke:String|pos|s=source_string|pattern=pattern_string|start=start_index
+
{{#invoke:String|match|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}}
   
Рядок 123: Рядок 123:
 
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.
Рядок 133: Рядок 133:
   
 
If invoked using named parameters, Mediawiki will automatically remove any leading or
 
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from each string. In some circumstances this is desirable, in
+
trailing whitespace from each string. In some circumstances this is desirable, in
 
other cases one may want to preserve the whitespace.
 
other cases one may want to preserve the whitespace.
   
 
If the match_number or start_index are out of range for the string being queried, then
 
If the match_number or start_index are out of range for the string being queried, then
 
this function generates an error. An error is also generated if no match is found.
 
this function generates an error. An error is also generated if no match is found.
If one adds the parameter ignore_errors=true, then the error will be suppressed and
+
If one adds the parameter ignore_errors=true, then the error will be suppressed and
 
an empty string will be returned on any failure.
 
an empty string will be returned on any failure.
   
Рядок 148: Рядок 148:
   
 
]]
 
]]
  +
-- This sub-routine is exported for use in other modules
  +
function str._match( s, pattern, start, match_index, plain_flag, 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 )
 
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 )
if s == '' then
 
return str._error( 'Target string is empty' );
 
end
 
if pattern == '' then
 
return str._error( 'Pattern string is empty' );
 
end
 
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
 
end
   
Рядок 231: Рядок 237:
   
 
If invoked using named parameters, Mediawiki will automatically remove any leading or
 
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the target string. In some circumstances this is desirable, in
+
trailing whitespace from the target string. In some circumstances this is desirable, in
 
other cases one may want to preserve the whitespace.
 
other cases one may want to preserve the whitespace.
   
 
The first character has an index value of 1.
 
The first character has an index value of 1.
   
If one requests a negative value, this function will select a character by counting backwards
+
If one requests a negative value, this function will select a character by counting backwards
 
from the end of the string. In other words pos = -1 is the same as asking for the last character.
 
from the end of the string. In other words pos = -1 is the same as asking for the last character.
   
Рядок 242: Рядок 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
  +
  +
--[[
  +
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
 
end
   
Рядок 272: Рядок 309:
   
 
If invoked using named parameters, Mediawiki will automatically remove any leading or
 
If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the parameter. In some circumstances this is desirable, in
+
trailing whitespace from the parameter. In some circumstances this is desirable, in
 
other cases one may want to preserve the whitespace.
 
other cases one may want to preserve the whitespace.
   
This function returns the first index >= "start" where "target" can be found
+
This function returns the first index >= "start" where "target" can be found
within "source". Indices are 1-based. If "target" is not found, then this
+
within "source". Indices are 1-based. If "target" is not found, then this
 
function returns 0. If either "source" or "target" are missing / empty, this
 
function returns 0. If either "source" or "target" are missing / empty, this
 
function also returns 0.
 
function also returns 0.
Рядок 283: Рядок 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
 
return 0;
 
end
 
 
plain = str._getBoolean( plain );
 
   
  +
if source_str == '' or pattern == '' then
local start = mw.ustring.find( source_str, pattern, start_pos, plain )
 
  +
return 0
if start == nil then
 
  +
end
start = 0
 
  +
end
 
  +
plain = str._getBoolean( plain )
 
  +
return start
 
  +
local start = mw.ustring.find( source_str, pattern, start_pos, plain )
  +
if start == nil then
  +
start = 0
  +
end
  +
  +
return start
 
end
 
end
   
Рядок 321: Рядок 358:
 
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
  +
pattern = str._escapePattern( pattern )
  +
replace = mw.ustring.gsub( replace, "%%", "%%%%" ) --Only need to escape replacement sequences.
  +
end
   
  +
local result
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
+
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] )
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
  +
  +
--[[
  +
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
  +
  +
--[[
  +
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
   
Рядок 371: Рядок 487:
 
]]
 
]]
 
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 i,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
   
 
--[[
 
--[[
Рядок 391: Рядок 507:
 
]]
 
]]
 
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">Помилка модуля String: ' .. error_str .. '</strong>';
+
local error_str = '<strong class="error">Помилка модуля String: ' .. 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 = '[[Категорія:' .. error_category .. ']]' .. error_str;
+
error_str = '[[Категорія:' .. error_category .. ']]' .. error_str
  +
end
end
 
  +
 
return error_str;
+
return error_str
 
end
 
end
   
Рядок 412: Рядок 528:
 
]]
 
]]
 
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
 
end
 
end
   
 
--[[
 
--[[
Helper function that escapes all pattern characters so that they will be treated
+
Helper function that escapes all pattern characters so that they will be treated
 
as plain text.
 
as plain text.
 
]]
 
]]
 
function str._escapePattern( pattern_str )
 
function str._escapePattern( pattern_str )
return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" );
+
return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" )
 
end
 
end
   

Поточна версія на 00:13, 15 липня 2019

--[[

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 first 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_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 sub-routine is exported for use in other modules
function str._match( s, pattern, start, match_index, plain_flag, 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_flag, 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

--[[
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

--[[
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 _, 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">Помилка модуля String: ' .. error_str .. '</strong>'
	if error_category ~= '' and not str._getBoolean( no_category ) then
		error_str = '[[Категорія:' .. 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