reparse-coffeescript/examples/json.coffee

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ReParse = require('../src/reparse').ReParse
util = require("util")
peg = require('./pegjson').parser;
require('./upgrades')
class ReJSON extends ReParse
ignorews: true
LITERAL = {'true': true, 'false': false, 'null': null}
STRING = {"\"": 34, "\\": 92, "/": 47, 'b': 8, 'f': 12, 'n': 10, 'r': 13, 't': 9}
value: => @choice @literal, @string, @number, @array, @object
object: => @between('{', '}', @members).reduce ((obj, pair) => obj[pair[0]] = pair[2]; obj), {}
members: => @sepBy @pair, ','
pair: => @seq @string, ':', @value
array: => @between '[', ']', @elements
elements: => @sepBy @value, /^,/
literal: => LITERAL[@m(/^(true|false|null)/)]
number: => parseFloat @m(/^\-?\d+(?:\.\d+)?(?:[eE][\+\-]?\d+)?/)
string: =>
chars = @m(/^"((?:\\["\\/bfnrt]|\\u[0-9a-fA-F]{4}|[^"\\])*)"/)
chars.replace /\\(["\\/bfnrt])|\\u([0-9a-fA-F]{4})/g, (_, $1, $2) =>
String.fromCharCode (if $1 then STRING[$1] else parseInt($2, 16)) # "
parse: =>
super
@start(@value)
capture = (stream, encoding, fn) =>
data = ""
stream.setEncoding encoding
stream.on "data", (chunk) => data += chunk
stream.on "end", => fn data
time = (label, reps, fn) =>
start = Date.now()
for i in [0..reps]
fn()
util.puts label + ": " + (Date.now() - start)
input = "{\"a\": [1, \"foo\", [], {\"foo\": 1, \"bar\": [1, 2, 3]}] }"
console.log util.inspect (new ReJSON).parse( input), false, 4
jsonparse = new ReJSON()
time "JSON", 1000, => JSON.parse input
time "PEG.js", 1000, => peg.parse input
time "ReParse", 1000, => jsonparse.parse(input)