'use strict'

fs = require 'fs'
pathUtils = require 'path'
PEG = require 'pegjs'
grammar = require './grammar.pegjs'
parser = PEG.buildParser grammar,
    optimize: 'speed'

module.exports = (file) ->
    try
        parser.parse(file)
    catch err
        lines = file.split '\n'
        line = err.line - 1
        msg = ''
        msg += lines[line - 1] + '\n' if err.line > 1
        msg += "\u001b[31m#{lines[line]}\u001b[39m \n" if line isnt lines.length
        msg += lines[line + 1] + '\n' if line < lines.length

        msg += "\nLine #{err.line}, column #{err.column}: #{err.message}\n"
        throw Error msg