Add command-line interface ./match (adapted from POPL 2012 version).

[match/match.git] / program / Main.hs

import PMInstance
import PMDefaults
import ProposalMatcher
import System.IO
import Data.Array.IArray
import Data.Array.Unboxed
import ArrayStuff
import Text.CSV

-- Command-line interface with simple tab-separated input/output formats.
-- ./match <example.in

-- pretty silly but it does the job
swapTabCommaIn s = map (\c -> if c == '\t' then ',' else if c == ',' then '\t' else c) s
removeQuotes s = filter (\c -> not (c == '"')) s

-- Some versions of Text.CSV do not use or accept a trailing newline; compensate for that.
removeTrailingNewline s = if not (null s) && last s == '\n' then init s else s
addTrailingNewline s = if not (null s) && last s /= '\n' then s ++ ['\n'] else s

parseTSV fname str = case parseCSV fname (swapTabCommaIn $ removeTrailingNewline str) of
	Left pe -> Left pe
	Right ll -> Right $ map (map swapTabCommaIn) ll
printTSV ll = addTrailingNewline $ removeQuotes $ swapTabCommaIn $ printCSV $ map (map swapTabCommaIn) ll

main = do
	incsv <- hGetContents stdin
	-- handle errors another day, or let the platform do it
	let Right inll = parseTSV "standard input" incsv
	let loadList = head inll
	let numRvrs = length loadList
	let loadA = listArray (0, numRvrs-1) (map read loadList)
	let numProps = length (tail inll)
	-- explicit type on the next line appears to be necessary
	let pxarr = listOfListsToArray2D (tail inll) :: Array (Int,Int) String
	-- careful, we end up transposing the array in here
	let prefA = funcArray ((0,0), (numRvrs-1,numProps-1)) (\(i,j) -> read (pxarr ! (j, i)))
	let theInst = PMInstance numRvrs numProps loadA prefA
	let PMatching theMatching = doMatching pmDefaults theInst
	hPutStr stdout $ printTSV $ map (\(i, j) -> map show [i, j]) theMatching