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/*
* Copyright (C) 2009-2011 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 cc.spray.json
import annotation.tailrec
import java.lang.StringBuilder
trait JsonPrinter extends (JsValue => String) {
def apply(x: JsValue) = {
val sb = new StringBuilder
print(x, sb)
sb.toString
}
def print(x: JsValue, sb: StringBuilder)
protected def printLeaf(x: JsValue, sb: StringBuilder) {
x match {
case JsNull => sb.append("null")
case JsTrue => sb.append("true")
case JsFalse => sb.append("false")
case JsNumber(x) => sb.append(x)
case JsString(x) => printString(x, sb)
case _ => throw new IllegalStateException
}
}
protected def printString(s: String, sb: StringBuilder) {
@tailrec
def printEscaped(s: String, ix: Int) {
if (ix < s.length) {
s.charAt(ix) match {
case '"' => sb.append("\\\"")
case '\\' => sb.append("\\\\")
case x if 0x20 <= x && x < 0x7F => sb.append(x)
case '\b' => sb.append("\\b")
case '\f' => sb.append("\\f")
case '\n' => sb.append("\\n")
case '\r' => sb.append("\\r")
case '\t' => sb.append("\\t")
case x if x <= 0xFF => sb.append("\\u00").append(Integer.toHexString(x))
case x if x <= 0xFFF => sb.append("\\u0").append(Integer.toHexString(x))
case x => sb.append("\\u").append(Integer.toHexString(x))
}
printEscaped(s, ix + 1)
}
}
sb.append('"')
printEscaped(s, 0)
sb.append('"')
}
protected def printSeq[A](iterable: Iterable[A], printSeparator: => Unit)(f: A => Unit) {
var first = true
iterable.foreach { a =>
if (first) first = false else printSeparator
f(a)
}
}
}
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