မဝ်ဂျူ:string/templates
မံက်ပြာကတ်
(ကလေၚ်ထ္ၜး နူ မဝ်ဂျူ:string)
Documentation for this module may be created at မဝ်ဂျူ:string/templates/doc
local str = {}
local parameters_module = "Module:parameters"
local patterns_module = "Module:patterns"
local string_utilities_module = "Module:string utilities"
local abs = math.abs
local find = string.find
local format = string.format
local floor = math.floor
local loader = package.loaders[2]
local lower = string.lower
local match = string.match
local rep = string.rep
local require = require
local select = select
local tonumber = tonumber
local type = type
local unpack = unpack
local function decode_uri(...)
decode_uri = require(string_utilities_module).decode_uri
return decode_uri(...)
end
local function pattern_escape(...)
pattern_escape = require(patterns_module).pattern_escape
return pattern_escape(...)
end
local function process_params(...)
process_params = require(parameters_module).process
return process_params(...)
end
local function replacement_escape(...)
replacement_escape = require(patterns_module).replacement_escape
return replacement_escape(...)
end
local function ufind(...)
ufind = require(string_utilities_module).find
return ufind(...)
end
local function ugmatch(...)
ugmatch = require(string_utilities_module).gmatch
return ugmatch(...)
end
local function ugsub(...)
ugsub = require(string_utilities_module).gsub
return ugsub(...)
end
local function ulen(...)
ulen = require(string_utilities_module).len
return ulen(...)
end
local function ulower(...)
ulower = require(string_utilities_module).lower
return ulower(...)
end
local function umatch(...)
umatch = require(string_utilities_module).match
return umatch(...)
end
local function usub(...)
usub = require(string_utilities_module).sub
return usub(...)
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.
]]
local function _getParameters(frame_args, arg_list)
local new_args, i, value = {}, 1
for _, arg in ipairs(arg_list) do
value = frame_args[arg]
if value == nil then
value = frame_args[i]
i = i + 1
end
new_args[arg] = value
end
return new_args
end
--[[
len
This function returns the length of the target string.
Usage:
{{#invoke:string/templates|len|target_string|}}
OR
{{#invoke:string/templates|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)
return ulen(_getParameters(frame.args, {"s"}).s or "")
end
--[[
len_visible
This function returns the length of the target string, excluding the text encompassed in < ... >
Usage: exactly as len, above.
]]
function str.len_visible(frame)
return ulen(ugsub(_getParameters(frame.args, {"s"}).s or "", "<[^<>]+>", ""))
end
--[[
sub
This function returns a substring of the target string at specified indices.
Usage:
{{#invoke:string/templates|sub|target_string|start_index|end_index}}
OR
{{#invoke:string/templates|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 = _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 s_len = ulen(s)
-- Convert negatives for range checking
if i < 0 then
i = s_len + i + 1
end
if j < 0 then
j = s_len + j + 1
end
if i > s_len or j > s_len then
return str._error('String subset index out of range')
elseif j < i then
return str._error('String subset indices out of order')
end
return usub(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 usub(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/templates|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
OR
{{#invoke:string/templates|pos|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
]]
function str.match(frame)
local new_args = _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 = floor(tonumber(new_args['match']) or 1)
local nomatch = new_args['nomatch']
if s == '' then
return str._error('Target string is empty')
elseif pattern == '' then
return str._error('Pattern string is empty')
elseif abs(start) < 1 or abs(start) > ulen(s) then
return str._error('Requested start is out of range')
elseif match_index == 0 then
return str._error('Match index is out of range')
elseif plain_flag then
pattern = pattern_escape(pattern)
end
local result
if match_index == 1 then
-- Find first match is simple case
result = umatch(s, pattern, start)
else
if start > 1 then
s = usub(s, start)
end
local iterator = ugmatch(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, i = {}, 0
for w in iterator do
i = i + 1
result_table[i] = w
end
result = result_table[i + match_index]
end
end
if result ~= nil then
return result
elseif nomatch == nil then
return str._error('Match not found')
end
return nomatch
end
--[[
pos
This function returns a single character from the target string at position pos.
Usage:
{{#invoke:string/templates|pos|target_string|index_value}}
OR
{{#invoke:string/templates|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 = _getParameters(frame.args, { 'target', 'pos' })
local target_str = new_args['target'] or ''
local pos = tonumber(new_args['pos']) or 0
if pos == 0 or abs(pos) > ulen(target_str) then
return str._error('String index out of range')
end
return usub(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 = _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 = ufind(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/templates|find|source_str|target_string|start_index|plain_flag}}
OR
{{#invoke:string/templates|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 an empty string. If either "source" or "target" are missing / empty, this
function also returns an empty string.
This function should be safe for UTF-8 strings.
]]
function str.find(frame)
local main_param = {required = true, allow_empty = true}
return ufind(unpack(process_params(frame.args, {
[1] = main_param,
[2] = main_param,
[3] = {type = "number"},
[4] = {type = "boolean"},
})))
end
--[[
replace
This function allows one to replace a target string or pattern within another
string.
Usage:
{{#invoke:string/templates|replace|source_str|pattern_string|replace_string|replacement_count|plain_flag}}
OR
{{#invoke:string/templates|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 = _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 = pattern_escape(pattern)
replace = replacement_escape(replace)
end
return (ugsub(source_str, pattern, replace, count))
end
function str.gsub(frame)
local main_param = {required = true, allow_empty = true, no_trim = true}
return (ugsub(unpack(process_params(frame.args, {
[1] = main_param,
[2] = main_param,
[3] = main_param,
[4] = {type = "number"},
}))))
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 rep(frame.args[1] or '', repetitions)
end
function str.lower(frame)
return ulower(frame.args[1] or "")
end
str.lc = str.lower
--[[
format
This function allows one to format strings according to a template. This is a direct interface onto
str.format() in Lua, and works like the C printf() function.
For example:
{{#invoke:string/templates|format|page_%04d.html|65}}
will produce the result
page_0065.html
Parameters
1: The format template. See https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#string.format
2, 3, ...: Arguments to be inserted into the template.
Note that leading and trailing whitespace is not removed from the arguments.
]]
function str.format(frame)
local fmt = frame.args[1]
-- You can't call unpack() directly on frame.args because it isn't really a
-- table, and doesn't support the # operator.
local args = {}
local i = 2
while true do
local val = frame.args[i]
if not val then
break
end
table.insert(args, val)
i = i + 1
end
return format(fmt, unpack(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 Templates'
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">String Module Error: ' .. 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
--[[
Helper Function to interpret boolean strings
]]
function str._getBoolean(boolean_str)
local boolean_str_type = type(boolean_str)
if boolean_str_type == 'boolean' then
return boolean_str
elseif boolean_str_type ~= "string" then
error('No boolean value found')
end
boolean_str = lower(boolean_str)
return not (
boolean_str == 'false' or
boolean_str == 'no' or
boolean_str == '0' or
boolean_str == ''
)
end
function str.count(text, pattern, plain)
if not (type(text) == "string" or type(text) == "number") then
error('The first argument to the function "count" must be a string or a number, not a ' .. type(text) .. '.')
elseif not (type(pattern) == "string" or type(pattern) == "number") then
error('The first argument to the function "count" must be a string or a number, not a ' .. type(text) .. '.')
elseif plain then
pattern = pattern_escape(pattern)
end
return select(2, ugsub(text, pattern, ""))
end
function str.matchToArray(text, pattern)
local invoked = false
if type(text) == "table" then
invoked = true
if text.args then
local frame = text
local params = {
[1] = { required = true },
[2] = { required = true },
}
local args = process_params(frame.args, params)
text = args[1]
pattern = args[2]
else
error("If the first argument to matchToArray is a table, it should be a frame object.")
end
else
if not (type(pattern) == "string" or type(pattern) == "number") then
error("The second argument to matchToArray should be a string or a number.")
end
end
local matches = {}
local i = 0
for match in ugmatch(text, pattern) do
i = i + 1
matches[i] = match
end
if i > 0 then
if invoked then
return table.concat(matches, ", ")
else
return matches
end
else
if invoked then
return ""
else
return nil
end
end
end
--[=[
Similar to gmatch, but it returns the count of the match in addition to the
list of captures, something like ipairs().
If the pattern doesn't contain any captures, the whole match is returned.
Invoke thus:
for i, whole_match in require("Module:string/templates").imatch(text, pattern) do
[ do something with i and whole_match ]
end
or
for i, capture1[, capture2[, capture3[, ...]]] in require("Module:string/templates").imatch(text, pattern) do
[ do something with i and capture1 ]
end
For example, this code
for i, whole_match in require("Module:string/templates").imatch("a b c", "[a-z]") do
mw.log(i, whole_match)
end
will log
1 a
2 b
3 c
]=]
function str.imatch(text, pattern, pos, plain, use_basic_Lua_function)
local i = 0
pos = pos or 0
if not match(pattern, "%b()") then
pattern = "(" .. pattern .. ")"
end
local _find = use_basic_Lua_function and find or ufind
return function()
i = i + 1
local return_values = { _find(text, pattern, pos, plain) }
local j = return_values[2]
if return_values[3] then
pos = j + 1
-- Skip the first two returned values, which are the indices of the
-- whole match.
return i, unpack(return_values, 3)
end
end
end
function str.URIdecode(frame)
return decode_uri(frame.args[1], frame.args[2] or "PATH")
end
function str:__index(k)
self[k] = loader("Module:string/" .. k)()
return self[k]
end
return setmetatable(str, str)