Lift Framework example source code file (JsonParserSpec.scala)

This example Lift Framework source code file (JsonParserSpec.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Lift Framework tags/keywords

arbitrary, buffer, eof, int, int, jarray, jvalue, jvalue, nil, none, none, specification, specification, stingyreader

The Lift Framework JsonParserSpec.scala source code

/*
 * Copyright 2009-2011 WorldWide Conferencing, LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.liftweb
package json

import org.specs.{ScalaCheck, Specification}
import org.scalacheck.{Arbitrary, Gen}
import org.scalacheck.Prop._


/**
 * System under specification for JSON Parser.
 */
object JsonParserSpec extends Specification("JSON Parser Specification") with JValueGen with ScalaCheck {
  "Any valid json can be parsed" in {
    val parsing = (json: JValue) => { parse(Printer.pretty(render(json))); true }
    forAll(parsing) must pass
  }

  "Buffer size does not change parsing result" in {
    val bufSize = Gen.choose(2, 64)
    val parsing = (x: JValue, s1: Int, s2: Int) => { parseVal(x, s1) == parseVal(x, s2) }
    forAll(genObject, bufSize, bufSize)(parsing) must pass
  }

  "Parsing is thread safe" in {
    import java.util.concurrent._

    val json = Examples.person
    val executor = Executors.newFixedThreadPool(100)
    val results = (0 to 100).map(_ =>
      executor.submit(new Callable[JValue] { def call = parse(json) })).toList.map(_.get)
    results.zip(results.tail).forall(pair => pair._1 == pair._2) mustEqual true
  }

  "All valid string escape characters can be parsed" in {
    parse("[\"abc\\\"\\\\\\/\\b\\f\\n\\r\\t\\u00a0\"]") must_== JArray(JString("abc\"\\/\b\f\n\r\t\u00a0")::Nil)
  }

  "Unclosed string literal fails parsing" in {
    parseOpt("{\"foo\":\"sd") mustEqual None
    parseOpt("{\"foo\":\"sd}") mustEqual None
  }

  "The EOF has reached when the Reader returns EOF" in {
    class StingyReader(s: String) extends java.io.StringReader(s) {
      override def read(cbuf: Array[Char], off: Int, len: Int): Int = {
        val c = read()
        if (c == -1) -1
        else {
          cbuf(off) = c.toChar
          1
        }
      }
    }

    val json = JsonParser.parse(new StingyReader(""" ["hello"] """))
    json mustEqual JArray(JString("hello") :: Nil)
  }

  implicit def arbJValue: Arbitrary[JValue] = Arbitrary(genObject)

  private def parseVal(json: JValue, bufSize: Int) = {
    val existingSize = JsonParser.Segments.segmentSize
    try {
      JsonParser.Segments.segmentSize = bufSize
      JsonParser.Segments.clear
      JsonParser.parse(compact(render(json)))
    } finally {
      JsonParser.Segments.segmentSize = existingSize
    }
  }
}