WikiBot：基于 zhwiki 版创建，提供 len/sub/match/find/replace/split/join 等函数

2026-06-20T16:33:33Z

基于 zhwiki 版创建，提供 len/sub/match/find/replace/split/join 等函数

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--[[

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
]]
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
]]
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 );

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( '截取字符串索引脱离区间' );
end
if j < i then
return str._error( '截取字符串指示脱离顺序' );
end

return mw.ustring.sub( s, i, j )
end

--[[
sublength
]]
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
]]
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'];

if s == '' then
return str._error( '目标字符串是空的' );
end
if pattern == '' then
return str._error( '模式字符串是空的' );
end
if math.abs(start) < 1 or math.abs(start) > mw.ustring.len( s ) then
return str._error( '要求的起始点脱离区间' );
end
if match_index == 0 then
return str._error( '匹配索引脱离区间' );
end
if plain_flag then
pattern = str._escapePattern( pattern );
end

local result
if match_index == 1 then
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
for w in iterator do
match_index = match_index - 1;
if match_index == 0 then
result = w;
break;
end
end
else
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( '找不到匹配' );
else
return nomatch;
end
else
return result;
end
end

--[[
pos
]]
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( '字符串索引脱离区间' );
end

return mw.ustring.sub( target_str, pos, pos );
end

--[[
str_find
]]
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
]]
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
]]
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, "%%", "%%%%" );
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

--[[
rep
]]
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

--[[
split
]]
function str.split(inputstr, sep, no_pattern, ignore_null)
if type(inputstr) == type({table}) then
if not getArgs then getArgs = require('Module:Arguments').getArgs end
args = getArgs(inputstr, {parentFirst=true})
for arg_name, arg_value in pairs( args ) do
if arg_name == 1 or arg_name == '1' or arg_name == "str" or arg_name == "inputstr" or arg_name == "input" then
input_str = arg_value
elseif arg_name == 2 or arg_name == '2' or arg_name == "sep" or arg_name == "separator" then
separ = arg_value
elseif arg_name == 3 or arg_name == '3' or arg_name == "no_pattern" or arg_name == "no pattern" then
no_pattern_flag = arg_value
elseif arg_name == 4 or arg_name == '4' or arg_name == "ignore_null" or arg_name == "ignore null" then
ignore_null_flag = arg_value
elseif arg_name == 5 or arg_name == '5' or arg_name == "format" then
format = arg_value or "*{{{1}}}\n";
end
end
if not yesno then yesno = require('Module:Yesno') end
no_pattern_flag = yesno( no_pattern_flag or 'yes' )
ignore_null_flag = yesno( ignore_null_flag or 'no' )
is_invoke = true
format = mw.ustring.gsub(format or "*{{{1}}}\n", "%{%{%{.-%}%}%}", "%%s" );
it = mw.ustring.find(format, "%%s", 1)
if it == nil then format = format .. "%s" end
format = mw.ustring.gsub(format, "\\n", "\n")
else
input_str = inputstr
separ = sep
no_pattern_flag = no_pattern
ignore_null_flag = ignore_null
is_invoke = false
end
input_str = input_str or ''
separ = separ or "%s"
if no_pattern_flag == nil then no_pattern_flag = true end
if ignore_null_flag == nil then ignore_null_flag = false end

length = mw.ustring.len(input_str)
if no_pattern_flag then
separ = mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(mw.ustring.gsub(separ,
"%[", "%["), "%]", "%]"), "%{", "%{"), "%}", "%}"), "%%", "%%%%"), "%)", "%)"), "%-", "%-"),
"%^", "%^"), "%$", "%$"), "%(", "%("), "%.", "%."), "%*", "%*"), "%+", "%+"), "%|", "%|");
end
iterator = 1 ; i = 1 ; flag = true
result = {}
separ_str_begin, separ_str_end = mw.ustring.find(input_str, separ, iterator)
debug1 = 1
while flag do
debug1 = debug1 + 1
if separ_str_begin == nil or iterator > length or debug1 >= 100 then
separ_str_begin = 0
separ_str_end = -2
flag = false
end
if separ_str_end < separ_str_begin then separ_str_end = separ_str_begin end
finded_str = mw.ustring.sub(input_str, iterator, separ_str_begin - 1)
if not(mw.text.trim(finded_str) == '' and ignore_null_flag) then
result[i] = finded_str
i = i + 1
end

iterator = separ_str_end + 1
separ_str_begin, separ_str_end = mw.ustring.find(input_str, separ, iterator)
end
if is_invoke then
body = ''
for i, result_str in pairs( result ) do
body = body .. mw.ustring.gsub(format, "%%s", result_str)
end
return body
end
return result;
end

--[[
join
]]
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 functions

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

function str._error( error_str )
local frame = mw.getCurrentFrame();
local error_category = frame.args.error_category or '字符串模块报告的错误';
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">字符串模块出错：' .. 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

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( '布尔值找不到' );
end
return boolean_value
end

function str._escapePattern( pattern_str )
return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" );
end

return str

Module:String - 版本历史

WikiBot：​基于 zhwiki 版创建，提供 len/sub/match/find/replace/split/join 等函数

WikiBot：基于 zhwiki 版创建，提供 len/sub/match/find/replace/split/join 等函数