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词条 Module:Convert/helper
释义 -- This module provides some functions to prepare template parameters-- for use with Template:Convert.-- This module is not used by Template:Convert or Module:Convert.

local function stripToNil(text)

-- If text is a non-empty string, return its trimmed content,

-- otherwise return nothing (empty string or not a string).

if type(text) == 'string' then

return text:match('(%S.-)%s*$')

end

end

-- Remove commas and references (any strip markers) from a number.-- First usage in Template:Infobox_UK_place/dist (June 2018)

local function cleanNumber(frame)

local args = frame.args

local text = stripToNil(args[1]) or

if text == or tonumber(text) then

return text

end

return mw.text.killMarkers(text):gsub(',', )

end

-- Format regular input with fraction (MOS-confirmant) into Convert-format "12+3/8" ("+" added).-- First usage in Template:NFL_predraft (August 2017)

local function number(frame)

--[[ Preprocess a template parameter to translate a number to be used as

input for {{convert}}.

{{#invoke:convert/helper|number|12 3/8}} → 12+3/8

Input Output

12 12

12 3/8 12+3/8

{{frac|12|3|8}} 12+3/8

12{{frac|3|8}} 12+3/8

12⅜ 12+3/8

Template:Fraction redirects to Template:Frac so either may be used in the input.

]]

local args = frame.args

local text = stripToNil(args[1]) or

if text == or tonumber(text) then

return text -- examples: , '12', '12.3', '12.3e4', or negative

end

text = text:gsub(' ', ' '):gsub(' +', ' '):gsub(' *%+ *', '+'):gsub('⁄', '/'):gsub('⁄', '/')

local integer, numerator, denominator, rest

-- Look for a fraction of form '12 3/8' or '12+3/8' or '3/8'.

integer, numerator, denominator = text:match('^(%d+)[ +](%d+)/(%d+)$')

if integer then

return integer .. '+' .. numerator .. '/' .. denominator

end

numerator, denominator = text:match('^(%d+)/(%d+)$')

if numerator then

return numerator .. '/' .. denominator

end

-- Look for an expanded fraction such as the result of {{frac|12|3|8}} or 12{{frac|3|8}} or {{frac|3|8}}.

numerator, denominator = text:match('(%d+)/(%d+)')

if numerator then

integer = text:match('(%d+)') or

text:match('^(%d+)%s*​

text:match('^(%d+)%s*

return (integer and (integer .. '+') or ) .. numerator .. '/' .. denominator

end

-- Look for a fraction of form '12¾' or '¾'.

local fractions = {

['½'] = '1/2',

['⅓'] = '1/3',

['⅔'] = '2/3',

['¼'] = '1/4',

['¾'] = '3/4',

['⅛'] = '1/8',

['⅜'] = '3/8',

['⅝'] = '5/8',

['⅞'] = '7/8',

}

integer, rest = text:match('^(%d*)%s*(.*)')

local expand = fractions[rest]

if expand then

return (integer == and integer or (integer .. '+')) .. expand

end

return text

end

return {

number = number,

cleanNumber = cleanNumber,

}

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