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author | Mathias <mathias@spray.cc> | 2011-05-06 11:11:37 +0200 |
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committer | Mathias <mathias@spray.cc> | 2011-05-06 11:11:37 +0200 |
commit | 0ce9cf8fce1dc475f3bb2a517e0a7698c9e0a5d9 (patch) | |
tree | 62de608642a30ec478411d27e94179ec64c5bd17 /src/main/scala/cc/spray/json/JsonPrinter.scala | |
download | spray-json-0ce9cf8fce1dc475f3bb2a517e0a7698c9e0a5d9.tar.gz spray-json-0ce9cf8fce1dc475f3bb2a517e0a7698c9e0a5d9.tar.bz2 spray-json-0ce9cf8fce1dc475f3bb2a517e0a7698c9e0a5d9.zip |
Initial commit (split off from main spray codebase)
Diffstat (limited to 'src/main/scala/cc/spray/json/JsonPrinter.scala')
-rw-r--r-- | src/main/scala/cc/spray/json/JsonPrinter.scala | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/src/main/scala/cc/spray/json/JsonPrinter.scala b/src/main/scala/cc/spray/json/JsonPrinter.scala new file mode 100644 index 0000000..7751b7e --- /dev/null +++ b/src/main/scala/cc/spray/json/JsonPrinter.scala @@ -0,0 +1,75 @@ +/* + * 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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