Módulo:String2

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-- Version 2021-01-30

local p = {}

p.trim = function(frame)
    local s = mw.text.trim(frame.args[1] or "")
    return s
end

p.upper = function(frame)
    local s = mw.text.trim(frame.args[1] or "")
    return string.upper(s)
end

p.lower = function(frame)
    local s = mw.text.trim(frame.args[1] or "")
    return string.lower(s)
end

p.sentence = function (frame )
    frame.args[1] = string.lower(frame.args[1])
    return p.ucfirst(frame)
end

p.ucfirst = function (frame )
    local s =  mw.text.trim( frame.args[1] or "" )
    local s1 = ""
    -- if it's a list chop off and (store as s1) everything up to the first <li>
    local lipos = mw.ustring.find(s, "<li>" )
    if lipos then
        s1 = mw.ustring.sub(s, 1, lipos + 3)
        s = mw.ustring.sub(s, lipos + 4)
    end
    -- s1 is either "" or the first part of the list markup, so we can continue
    -- and prepend s1 to the returned string
    local letterpos
    if mw.ustring.find(s, "^%[%[[^|]+|[^%]]+%]%]") then
        -- this is a piped wikilink, so we capitalise the text, not the pipe
        local _
        _, letterpos = mw.ustring.find(s, "|%A*%a") -- find the first letter after the pipe
    else
        letterpos = mw.ustring.find(s, '%a')
    end
    if letterpos then
        local first = mw.ustring.sub(s, 1, letterpos - 1)
        local letter = mw.ustring.sub(s, letterpos, letterpos)
        local rest = mw.ustring.sub(s, letterpos + 1)
        return s1 .. first .. mw.ustring.upper(letter) .. rest
    else
        return s1 .. s
    end
end

p.title = function (frame )
    -- http://grammar.yourdictionary.com/capitalization/rules-for-capitalization-in-titles.html
    -- recommended by The U.S. Government Printing Office Style Manual:
    -- "Capitalize all words in titles of publications and documents,
    -- except a, an, the, at, by, for, in, of, on, to, up, and, as, but, or, and nor."
    local alwayslower = {['a'] = 1, ['an'] = 1, ['the'] = 1,
        ['and'] = 1, ['but'] = 1, ['or'] = 1, ['for'] = 1,
        ['nor'] = 1, ['on'] = 1, ['in'] = 1, ['at'] = 1, ['to'] = 1,
        ['from'] = 1, ['by'] = 1, ['of'] = 1, ['up'] = 1 }
    local res = ''
    local s =  mw.text.trim( frame.args[1] or "" )
    local words = mw.text.split( s, " ")
    for i, s in ipairs(words) do
        s = string.lower( s )
        if( i > 1 and alwayslower[s] == 1) then
            -- leave in lowercase
        else
            s = mw.getContentLanguage():ucfirst(s)
        end
        words[i] = s
    end
    return table.concat(words, " ")
end

-- findlast finds the last item in a list
-- the first unnamed parameter is the list
-- the second, optional unnamed parameter is the list separator (default = comma space)
-- returns the whole list if separator not found
p.findlast = function(frame)
    local s =  mw.text.trim( frame.args[1] or "" )
    local sep = frame.args[2] or ""
    if sep == "" then sep = ", " end
    local pattern = ".*" .. sep .. "(.*)"
    local a, b, last = s:find(pattern)
    if a then
        return last
    else
        return s
    end
end

-- stripZeros finds the first number and strips leading zeros (apart from units)
-- e.g "0940" -> "940"; "Year: 0023" -> "Year: 23"; "00.12" -> "0.12"
p.stripZeros = function(frame)
    local s = mw.text.trim(frame.args[1] or "")
    local n = tonumber( string.match( s, "%d+" ) ) or ""
    s = string.gsub( s, "%d+", n, 1 )
    return s
end

-- nowiki ensures that a string of text is treated by the MediaWiki software as just a string
-- it takes an unnamed parameter and trims whitespace, then removes any wikicode
p.nowiki = function(frame)
    local str = mw.text.trim(frame.args[1] or "")
    return mw.text.nowiki(str)
end

-- posnq (position, no quotes) returns the numerical start position of the first occurrence
-- of one piece of text ("match") inside another ("str").
-- It returns nil if no match is found, or if either parameter is blank.
-- It takes the text to be searched in as the first unnamed parameter, which is trimmed.
-- It takes the text to match as the second unnamed parameter, which is trimmed and
-- any double quotes " are stripped out.
p.posnq = function(frame)
    local args = frame.args
    local pargs = frame:getParent().args
    for k, v in pairs(pargs) do
        args[k] = v
    end
    local str = mw.text.trim(args[1] or args.source or "")
    local match = mw.text.trim(args[2] or args.target or ""):gsub('"', '')
    if str == "" or match == "" then return nil end
    local plain = mw.text.trim(args[3] or args.plain or "")
    if plain == "false" then plain = false else plain = true end
    local nomatch = mw.text.trim(args[4] or args.nomatch or "")
    -- just take the start position
    local pos = mw.ustring.find(str, match, 1, plain) or nomatch
    return pos
end

-- split splits text at boundaries specified by separator
-- and returns the chunk for the index idx (starting at 1)
-- #invoke:String2 |split |text |separator |index |true/false
-- #invoke:String2 |split |txt=text |sep=separator |idx=index |plain=true/false
-- if plain is false/no/0 then separator is treated as a Lua pattern - defaults to plain=true
p.split = function(frame)
    local args = frame.args
    if not(args[1] or args.txt) then args = frame:getParent().args end
    local txt = args[1] or args.txt or ""
    if txt == "" then return nil end
    local sep = (args[2] or args.sep or ""):gsub('"', '')
    local idx = tonumber(args[3] or args.idx) or 1
    local plain = (args[4] or args.plain or "true"):sub(1,1)
    plain = (plain ~= "f" and plain ~= "n" and plain ~= "0")
    local splittbl = mw.text.split( txt, sep, plain )
    if idx < 0 then idx = #splittbl + idx + 1 end
    return splittbl[idx]
end

-- val2percent scans through a string, passed as either the first unnamed parameter or |txt=
-- it converts each number it finds into a percentage and returns the resultant string.
p.val2percent = function(frame)
    local args = frame.args
    if not(args[1] or args.txt) then args = frame:getParent().args end
    local txt = mw.text.trim(args[1] or args.txt or "")
    if txt == "" then return nil end
    local function v2p (x)
        x = (tonumber(x) or 0) * 100
        if x == math.floor(x) then x = math.floor(x) end
        return x .. "%"
    end
    txt = txt:gsub("%d[%d%.]*", v2p) -- store just the string
    return txt
end

-- one2a scans through a string, passed as either the first unnamed parameter or |txt=
-- it converts each occurrence of 'one ' into either 'a ' or 'an ' and returns the resultant string.
p.one2a = function(frame)
    local args = frame.args
    if not(args[1] or args.txt) then args = frame:getParent().args end
    local txt = mw.text.trim(args[1] or args.txt or "")
    if txt == "" then return nil end
    txt = txt:gsub(" one ", " a "):gsub("^one", "a"):gsub("One ", "A "):gsub("a ([aeiou])", "an %1"):gsub("A ([aeiou])", "An %1")
    return txt
end

-- findpagetext returns the position of a piece of text in a page
-- First positional parameter or |text is the search text
-- Optional parameter |title is the page title, defaults to current page
-- Optional parameter |plain is either true for plain search (default) or false for Lua pattern search
-- Optional parameter |nomatch is the return value when no match is found; default is nil
p._findpagetext = function(args)
    -- process parameters
    local nomatch = args.nomatch or ""
    if nomatch == "" then nomatch = nil end
    --
    local text = mw.text.trim(args[1] or args.text or "")
    if text == "" then return nil end
    --
    local title = args.title or ""
    local titleobj
    if title == "" then
        titleobj = mw.title.getCurrentTitle()
    else
        titleobj = mw.title.new(title)
    end
    --
    local plain = args.plain or ""
    if plain:sub(1, 1) == "f" then plain = false else plain = true end
    -- get the page content and look for 'text' - return position or nomatch
    local content = titleobj:getContent()
    return mw.ustring.find(content, text, 1, plain) or nomatch    -- returns multiple values
end
p.findpagetext = function(frame)
    local args = frame.args
    local pargs = frame:getParent().args
    for k, v in pairs(pargs) do
        args[k] = v
    end
    if not (args[1] or args.text) then return nil end
    -- just the first value
    return (p._findpagetext(args))
end

-- what follows was merged from Module:StringFunc

-- helper functions
p._GetParameters = require('Module:GetParameters')

-- Argument list helper function, as per Module:String
p._getParameters = p._GetParameters.getParameters

-- Escape Pattern helper function so that all characters are treated as plain text, as per Module:String
function p._escapePattern( pattern_str)
    return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" );
end

-- Helper Function to interpret boolean strings, as per Module:String
p._getBoolean = p._GetParameters.getBoolean

--[[
Strip

This function Strips characters from string

Usage:
{{#invoke:String2|strip|source_string|characters_to_strip|plain_flag}}

Parameters
    source: The string to strip
    chars:  The pattern or list of characters to strip from string, replaced with ''
    plain:  A flag indicating that the chars should be understood as plain text. defaults to true.

Leading and trailing whitespace is also automatically stripped from the string.
]]
function p.strip( frame )
    local new_args = p._getParameters( frame.args,  {'source', 'chars', 'plain'} )
    local source_str = new_args['source'] or '';
    local chars = new_args['chars'] or '' or 'characters';
    source_str = mw.text.trim(source_str);
    if source_str == '' or chars == '' then
        return source_str;
    end
    local l_plain = p._getBoolean( new_args['plain'] or true );
    if l_plain then
        chars = p._escapePattern( chars );
    end
    local result;
    result = mw.ustring.gsub(source_str, "["..chars.."]", '')
    return result;
end

return p