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/*
* Copyright (C) 2011 Mathias Doenitz
*
* 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 spray.json
import org.specs2.mutable._
import scala.util.control.NonFatal
class JsonParserSpec extends Specification {
"The JsonParser" should {
"parse 'null' to JsNull" in {
JsonParser("null") === JsNull
}
"parse 'true' to JsTrue" in {
JsonParser("true") === JsTrue
}
"parse 'false' to JsFalse" in {
JsonParser("false") === JsFalse
}
"parse '0' to JsNumber" in {
JsonParser("0") === JsNumber(0)
}
"parse '1.23' to JsNumber" in {
JsonParser("1.23") === JsNumber(1.23)
}
"parse '-1E10' to JsNumber" in {
JsonParser("-1E10") === JsNumber("-1E+10")
}
"parse '12.34e-10' to JsNumber" in {
JsonParser("12.34e-10") === JsNumber("1.234E-9")
}
"parse \"xyz\" to JsString" in {
JsonParser("\"xyz\"") === JsString("xyz")
}
"parse escapes in a JsString" in {
JsonParser(""""\"\\/\b\f\n\r\t"""") === JsString("\"\\/\b\f\n\r\t")
JsonParser("\"L\\" + "u00e4nder\"") === JsString("Länder")
}
"parse all representations of the slash (SOLIDUS) character in a JsString" in {
JsonParser( "\"" + "/\\/\\u002f" + "\"") === JsString("///")
}
"parse a simple JsObject" in (
JsonParser(""" { "key" :42, "key2": "value" }""") ===
JsObject("key" -> JsNumber(42), "key2" -> JsString("value"))
)
"parse a simple JsArray" in (
JsonParser("""[null, 1.23 ,{"key":true } ] """) ===
JsArray(JsNull, JsNumber(1.23), JsObject("key" -> JsTrue))
)
"parse directly from UTF-8 encoded bytes" in {
val json = JsObject(
"7-bit" -> JsString("This is regular 7-bit ASCII text."),
"2-bytes" -> JsString("2-byte UTF-8 chars like £, æ or Ö"),
"3-bytes" -> JsString("3-byte UTF-8 chars like ﾖ, ᄅ or ᐁ."),
"4-bytes" -> JsString("4-byte UTF-8 chars like \uD801\uDC37, \uD852\uDF62 or \uD83D\uDE01."))
JsonParser(json.prettyPrint.getBytes("UTF-8")) === json
}
"parse directly from UTF-8 encoded bytes when string starts with a multi-byte character" in {
val json = JsString("£0.99")
JsonParser(json.prettyPrint.getBytes("UTF-8")) === json
}
"be reentrant" in {
import scala.concurrent.{Await, Future}
import scala.concurrent.duration._
import scala.concurrent.ExecutionContext.Implicits.global
val largeJsonSource = scala.io.Source.fromInputStream(getClass.getResourceAsStream("/test.json")).mkString
val list = Await.result(
Future.traverse(List.fill(20)(largeJsonSource))(src => Future(JsonParser(src))),
5.seconds
)
list.map(_.asInstanceOf[JsObject].fields("questions").asInstanceOf[JsArray].elements.size) === List.fill(20)(100)
}
"not show bad performance characteristics when object keys' hashCodes collide" in {
val numKeys = 10000
val value = "null"
val regularKeys = Iterator.from(1).map(i => s"key_$i").take(numKeys)
val collidingKeys = HashCodeCollider.zeroHashCodeIterator().take(numKeys)
def createJson(keys: Iterator[String]): String = keys.mkString("""{"""", s"""":$value,"""", s"""":$value}""")
def nanoBench(block: => Unit): Long = {
// great microbenchmark (the comment must be kept, otherwise it's not true)
val f = block _
// warmup
(1 to 10).foreach(_ => f())
val start = System.nanoTime()
f()
val end = System.nanoTime()
end - start
}
val regularJson = createJson(regularKeys)
val collidingJson = createJson(collidingKeys)
val regularTime = nanoBench { JsonParser(regularJson) }
val collidingTime = nanoBench { JsonParser(collidingJson) }
collidingTime / regularTime must be < 2L // speed must be in same order of magnitude
}
"produce proper error messages" in {
def errorMessage(input: String, settings: JsonParserSettings = JsonParserSettings.default) =
try JsonParser(input, settings) catch { case e: JsonParser.ParsingException => e.getMessage }
errorMessage("""[null, 1.23 {"key":true } ]""") ===
"""Unexpected character '{' at input index 12 (line 1, position 13), expected ']':
|[null, 1.23 {"key":true } ]
| ^
|""".stripMargin
errorMessage("""[null, 1.23, { key":true } ]""") ===
"""Unexpected character 'k' at input index 16 (line 1, position 17), expected '"':
|[null, 1.23, { key":true } ]
| ^
|""".stripMargin
errorMessage("""{"a}""") ===
"""Unexpected end-of-input at input index 4 (line 1, position 5), expected '"':
|{"a}
| ^
|""".stripMargin
errorMessage("""{}x""") ===
"""Unexpected character 'x' at input index 2 (line 1, position 3), expected end-of-input:
|{}x
| ^
|""".stripMargin
"reject numbers which are too big / have too high precision" in {
val settings = JsonParserSettings.default.withMaxNumberCharacters(5)
errorMessage("123.4567890", settings) ===
"Number too long:The number starting with '123.4567890' had 11 characters which is more than the allowed limit " +
"maxNumberCharacters = 5. If this is legit input consider increasing the limit."
}
}
"fail gracefully for deeply nested structures" in {
val queue = new java.util.ArrayDeque[String]()
// testing revealed that each recursion will need approx. 280 bytes of stack space
val depth = 1500
val runnable = new Runnable {
override def run(): Unit =
try {
val nested = "[{\"key\":" * (depth / 2)
JsonParser(nested)
queue.push("didn't fail")
} catch {
case s: StackOverflowError => queue.push("stackoverflow")
case NonFatal(e) =>
queue.push(s"nonfatal: ${e.getMessage}")
}
}
val thread = new Thread(null, runnable, "parser-test", 655360)
thread.start()
thread.join()
queue.peek() === "nonfatal: JSON input nested too deeply:JSON input was nested more deeply than the configured limit of maxNesting = 1000"
}
"parse multiple values when allowTrailingInput" in {
val parser = new JsonParser("""{"key":1}{"key":2}""")
parser.parseJsValue(true) === JsObject("key" -> JsNumber(1))
parser.parseJsValue(true) === JsObject("key" -> JsNumber(2))
}
"reject trailing input when !allowTrailingInput" in {
def parser = JsonParser("""{"key":1}x""")
parser must throwA[JsonParser.ParsingException].like {
case e: JsonParser.ParsingException => e.getMessage must contain("expected end-of-input")
}
}
}
}
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