Module:Util

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This is a meta module.

This module is meant to be used only by other modules. It should not be invoked in wikitext.

This module depends on the following other modules:

• Module:Arguments
• Module:Cargo
• Module:Util/config

Overview

Provides utility functions for programming modules.

Structure

Group	Description
util.cast	utilities for casting values (i.e. from arguments)
util.html	shorthand functions for creating some html tags
util.misc	miscellaneous functions

Usage

This module should be loaded with require().

The above documentation is transcluded from Module:Util/doc. (edit | history)
Editors can experiment in this module's sandbox (create | mirror) and testcases (create) pages.
Subpages of this module.

-- Utility stuff

local util = {}

util.cast = {}
util.cast.bool_false = {'false', '0', 'disabled', 'off', 'no', ''}

function util.cast.boolean(value)
    -- Takes an abitary value and casts it to a bool value
    -- 
    -- for strings false will be according to util.cast.bool_false
    local t = type(value)
    if t == 'nil' then
        return false
    elseif t == 'boolean' then
        return value
    elseif t == 'number' then
        if value == 0 then return false end
        return true
    elseif t == 'string' then
        local tmp = string.lower(value)
        for _, v in ipairs(util.cast.bool_false) do
            if v == tmp then
                return false
            end
        end
        return true
    else
        error(string.format('value "%s" of type "%s" is not a boolean', value, t))
    end
    
end

function util.cast.number(value, args)
    -- Takes an abitary value and attempts to cast it to int
    --
    -- args:
    --  default: for strings, if default is nil and the conversion fails, an error will be returned
    --  min: error if <min
    --  max: error if >max
    if args == nil then
        args = {}
    end
    
    local t = type(value)
    local val
    
    if t == 'nil' then
        val = nil
    elseif t == 'boolean' then
        if value then
            val = 1
        else
            val = 0
        end
    elseif t == 'number' then
        val = value
    elseif t == 'string' then
        val = tonumber(value)
    end
    
    if val == nil then
        if args.default ~= nil then
            val = args.default
        else
            error(string.format('value "%s" of type "%s" is not an integer', tostring(value), t))
        end
    end
    
    if args.min ~= nil and val < args.min then
        error(string.format('"%i" is too small. Minimum: "%i"', val, args.min))
    end
    
    if args.max ~= nil and val > args.max then
        error(string.format('"%i" is too large. Maximum: "%i"', val, args.max))
    end
    
    return val
end

util.html = {}
function util.html.abbr(abbr, text, class)
    tag = mw.html.create('abbr')
    tag
        :attr('title', text or '')
        :attr('class', class or '')
        :wikitext(abbr or ' ')
        :done()
        
    return tostring(tag)
end

util.table = {}
function util.table.find_in_nested_array(args) 
    -- Iterates thoguh the given nested array and finds the given value
    -- 
    -- ex.   
    -- data = {
    -- {a=5}, {a=6}}
    -- find_nested_array{arg=6, tbl=data, key='a'} -> 6
    -- find_nested_array(arg=10, tbl=data, key='a'} -> nil
    -- -> returns "6"
    
    --
    -- args: Table containing:
    --  value: value of the argument
    --  tbl: table of valid options
    --  key: key or table of key of in tbl
    --  rtrkey: if key is table, return this key instead of the value instead
    --  rtrvalue: default: true
    
    local rtr
    
    if type(args.key) == 'table' then
        for _, item in ipairs(args.tbl) do
            for _, k in ipairs(args.key) do
                if item[k] == args.value then
                    rtr = item
                    break
                end
            end
        end
    elseif args.key == nil then
        for _, item in ipairs(args.tbl) do
            if item == args.value then
                rtr = item
                break
            end
        end
    else
        for _, item in ipairs(args.tbl) do
            if item[args.key] == args.value then
                rtr = item
                break
            end
        end
    end
    
    if rtr == nil then
        return rtr
    end

    if args.rtrkey ~= nil then 
        return rtr[args.rtrkey]
    elseif args.rtrvalue or args.rtrvalue == nil then
        return args.value
    else
        return rtr
    end
end

util.misc = {}
function util.misc.get_frame(frame)
    if frame == nil or type(frame) == 'table' then
        frame = mw.getCurrentFrame()
    end
    return frame
end

function util.misc.add_category(categories, args)
    -- categories: table of categories
    -- args: table of extra arguments
    --  namespace: id of namespace to validate against
    --  ingore_blacklist: set to non-nil to ingore the blacklist
    if type(categories) == 'string' then
        categories = {categories}
    end
    
    if args == nil then
        args = {}
    end
    
    
    local title = mw.title.getCurrentTitle()
    local sub_blacklist = {
        doc = true,
        sandbox = true,
        sandbox2 = true,
        testcases = true,
    }
    
    if args.namespace ~= nil and title.namespace ~= args.namespace then
        return ''
    end
    
    if args.ingore_blacklist == nil and sub_blacklist[title.subpageText] then
        return ''
    end
   
    local cats = {}
    
    for i, cat in ipairs(categories) do
        cats[i] = string.format('[[Category:%s]]', cat)
    end
    return table.concat(cats)
end

util.string = {}
function util.string.split_args(str, args)
    -- Splits arguments string into a table
    --
    -- str: String of arguments to split
    -- args: table of extra arguments
    --  sep: separator to use (default: ,)
    local out = {}
    
    if args == nil then
        args = {}
    end
    
    if str ~= nil then
        local row
        for str in mw.text.gsplit(str, args.sep or ',') do
            row = mw.text.split(str, '=')
            if #row == 1 then
                out[#out+1] = row[1] 
            elseif #row == 2 then
                out[row[1]] = row[2]
            else
                error(string.format('Number of arguments near = is too large (%s).', #row))
            end
        end
    end
    
    return out
end

return util