Mô đun:String/sandbox

Đây là trang chỗ thử mô đun cho Mô đun:String (khác).
Xem thêm trang con so sánh cho trường hợp kiểm thử (chạy).
--[=[  Mô đun này nhằm cung cấp các hàm chuỗi cơ bản.Phần nhiều hàm này cho phép gọi với các tham số có tên, các tham số không cótên, hoặc pha trộn cả hai kiểu. Nếu sử dụng các tham số có tên, MediaWiki tựđộng bỏ qua khoảng cách đằng truớc và đằng sau tham số. Tùy cách sử dụng, bạn cóthể cần giữ hoặc bỏ qua khoảng cách này.Các tùy chọn toàn cục:    ignore_errors: Nếu là 'true' hoặc 1, bất cứ trạng thái lỗi nào sẽ cho ra        chuỗi rỗng thay vì thông báo lỗi.        error_category: Nếu xuất hiện lỗi, trang được tự động xếp vào thể loại này        và thông báo lỗi sẽ được hiển thị. Thể loại mặc định là        [[Thể loại:Trang gây lỗi trong mô đun String]].            no_category: Nếu là 'true' hoặc 1, trang không được tự động xếp vào thể loại        khi xuất hiện lỗi.Các trường hợp kiểm thử đơn vị cho mô đun này có sẵn tại [[Mô đun:String/tests]].]=]local str = {}--[[lenThis function returns the length of the target string.Usage:{{#gọi:String|len|target_string|}}OR{{#gọi:String|len|s=target_string}}OR{{#gọi:String|len|string=target_string}}OR{{#gọi:String|len|string_to_detect_length_of=target_string}}Parameters	s: The string whose length to reportIf invoked using named parameters, Mediawiki will automatically remove any leading ortrailing whitespace from the target string.]]function str.len( frame )	local new_args = str._getParameters( frame.args, {'s'} );	local s = new_args['s'] or '' or 'string' or 'string_to_detect_length_of';	return mw.ustring.len( s )end--[[subThis function returns a substring of the target string at specified indices.Usage:{{#gọi:String|sub|target_string|start_index|end_index}}OR{{#gọi: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 jis a negative value, it is interpreted the same as selecting a character bycounting from the end of the string.  Hence, a value of -1 is the same asselecting the last character of the string.If the requested indices are out of range for the given string, an error isreported.]]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( 'Chỉ số chuỗi con nằm ngoài phạm vi' );	end	if j < i then		return str._error( 'Chỉ số chuỗi con bị lộn nguợc' );	end	return mw.ustring.sub( s, i, j )end--[[This function implements that features of {{str sub old}} and is kept in orderto 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--[[matchThis function returns a substring from the source string that matches aspecified pattern.Usage:{{#gọi:String|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}OR{{#gọi: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 ortrailing whitespace from each string.  In some circumstances this is desirable, inother cases one may want to preserve the whitespace.If the match_number or start_index are out of range for the string being queried, thenthis 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 andan 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]]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( 'Chuỗi đích rỗng' );	end	if pattern == '' then		return str._error( 'Chuỗi mẫu rỗng' );	end	if math.abs(start) < 1 or math.abs(start) > mw.ustring.len( s ) then		return str._error( 'Chỉ số bắt đầu nằm ngoài phạm vi' );	end	if match_index == 0 then		return str._error( 'Chỉ số trùng khớp nằm ngoài phạm vi' );	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( 'Không tìm thấy kết quả' );		else			return nomatch;		end	else		return result;	endend--[[posThis function returns a single character from the target string at position pos.Usage:{{#gọi:String|pos|target_string|index_value}}OR{{#gọi:String|pos|target=target_string|pos=index_value}}Parameters	target: The string to search	pos: The index for the character to returnIf invoked using named parameters, Mediawiki will automatically remove any leading ortrailing whitespace from the target string.  In some circumstances this is desirable, inother 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 backwardsfrom 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( 'Chỉ số chuỗi nằm ngoài phạm vi' );	end	return mw.ustring.sub( target_str, pos, pos );end--[[str_findThis 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 fornew 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 avalue of "1", which is generally unexpected behavior, and must be accounted forseparatetly.]]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 startend--[[findThis function allows one to search for a target string or pattern within anotherstring.Usage:{{#gọi:String|find|source_str|target_string|start_index|plain_flag}}OR{{#gọi: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 trueIf invoked using named parameters, Mediawiki will automatically remove any leading ortrailing whitespace from the parameter.  In some circumstances this is desirable, inother cases one may want to preserve the whitespace.This function returns the first index >= "start" where "target" can be foundwithin "source".  Indices are 1-based.  If "target" is not found, then thisfunction returns 0.  If either "source" or "target" are missing / empty, thisfunction 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 startend--[[replaceThis function allows one to replace a target string or pattern within anotherstring.Usage:{{#gọi:String|replace|source_str|pattern_string|replace_string|replacement_count|plain_flag}}OR{{#gọi: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 occurrences 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( 'tham số thứ 2 của hàm rep có giá trị "' .. ( frame.args[2] or '' ) .. '" thay cho số' )	end	return string.rep( frame.args[1] or '', repetitions )end--[[splitThis function splits a string by a delimiter or pattern into a new table of results.Usage:{{#gọi:String|split|source_str|delimiter|start_index|plain_flag}}OR{{#gọi:String|split|source=source_str|delimiter=delimiter|start=start_index|plain=plain_flag}}Parameters	source: The string to split; required	delimiter: The string or pattern to find within source; required	start: The index within the source string to start the search, defaults to 1; optional	plain: Boolean flag indicating that delimiter should be understood as plain		text and not as a Lua style regular expression, defaults to true; optionalIf invoked using named parameters, Mediawiki will automatically remove any leading ortrailing whitespace from the parameter.  In some circumstances this is desirable, inother cases one may want to preserve the whitespace.This function returns a new table of substrings of the source, split by the "delimiter".Indices are 1-based.If either "source" or "delimiter" are missing / empty, this function also returns nil.This function should be safe for UTF-8 strings.]]function str.split(frame)	local new_args = str._getParameters(frame.args, {'source', 'delimiter', 'start', 'plain'});	local source_str = new_args['source'] or '';	local pattern = new_args['delimiter'] or '';	if source_str=='' or pattern=='' then return nil; end -- required fields	local start_pos = tonumber(new_args['start']) or 1; -- optionals	local plain str._getBoolean(new_args['plain'] or true);	return mw.ustring.split(source_str, pattern, start_pos, plain); -- tableendfunction str.count(frame)	local new_args = str._getParameters( frame.args, {'source', 'substr'} );	local source_str = new_args['source'] or '';	local substr = new_args['substr'] or '';	if source_str == '' or pattern == '' then return nil; end	local dispose, count = string.gsub(source_str, substr, "")	return countend--[[Helper function that populates the argument list given that user may need to use a mix ofnamed and unnamed parameters.  This is relevant because named parameters are notidentical to unnamed parameters due to string trimming, and when dealing with stringswe 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 'Trang gây lỗi trong mô đun 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">Lỗi mô đun String: ' .. error_str .. '</strong>';	if error_category ~= '' and not str._getBoolean( no_category ) then		error_str = '[[Thể loại:' .. 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( 'Không tìm thấy giá trị luận lý' );	end	return boolean_valueend--[[Helper function that escapes all pattern characters so that they will be treatedas plain text.]]function str._escapePattern( pattern_str )	return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" );endreturn str