Initial commit (split off from main spray codebase)

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)
+    }
+  }
+} 
\ No newline at end of file