Module:MultiReplace

Module:MultiReplace/doc

From Wikipedia, see:

• https://en.wikipedia.org/wiki/Module:MultiReplace

This module is a dependency of {{Lowercase title}}, see the documentation there.

Usage

{{#invoke:MultiReplace|main|pattern1|replace1|pattern2|replace2|...}}

---

The above doc is transcluded from Module:MultiReplace/doc. (edit | history)
Add categories to the /doc subpage, not here. Subpages of this template.

---

local p = {}

local function MultiReplace(args)
    local input = args[1] or "{{{1}}}"
    local plain = args.plain == "yes"

    local i = 1
    local changeList = {}
    while args[i * 2] do
        local change = {pattern = args[i * 2], repl = args[i * 2 + 1]}
        if not change.repl then
            return require('Module:Error').error{
                'MultiReplace: Unpaired argument: <code>' .. (i * 2) .. ' = ' .. mw.text.nowiki(change.pattern) .. '</code>'
            }
        end
        changeList[i] = change
        i = i + 1
    end
    
    local matchList = {}
    local pos = 1
    local len = mw.ustring.len(input)
    local result = ""
    while pos <= len do
        local bestStart = len + 1
        local bestStop = len
        local bestChange
        for _, change in ipairs(changeList) do
            local start, stop = mw.ustring.find(input, change.pattern, pos, plain)
            if start and (start < bestStart) then
                bestStart = start
                bestStop = stop
                bestChange = change
            end
        end
        result = result .. mw.ustring.sub(input, pos, bestStart - 1)
        if bestChange then
            local fragment = mw.ustring.sub(input, bestStart, bestStop)
            result = result .. (plain and bestChange.repl or
                mw.ustring.gsub(fragment, bestChange.pattern, bestChange.repl, 1))
        end
        pos = bestStop + 1
    end
    return result
end

function p.main(frame, ...)
    local args =
        type(frame) ~= 'table' and {frame, ...} or
        type(frame.args) ~= 'table' and frame or
        frame.args[1] and frame.args or
        frame:getParent().args
    return MultiReplace(args)
end

return p