1 files changed, 71 insertions, 0 deletions
diff --git a/shared/src/main/scala/spray/json/PrettyPrinter.scala b/shared/src/main/scala/spray/json/PrettyPrinter.scala
new file mode 100644
index 0000000..7526dab
--- /dev/null
+++ b/shared/src/main/scala/spray/json/PrettyPrinter.scala
@@ -0,0 +1,71 @@
+/*
+ * 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 spray.json
+
+import java.lang.StringBuilder
+import annotation.tailrec
+
+/**
+  * A JsonPrinter that produces a nicely readable JSON source.
+ */
+trait PrettyPrinter extends JsonPrinter {
+  val Indent = 2
+
+  def print(x: JsValue, sb: StringBuilder): Unit = {
+    print(x, sb, 0)
+  }
+  
+  protected def print(x: JsValue, sb: StringBuilder, indent: Int): Unit = {
+    x match {
+      case JsObject(x) => printObject(x, sb, indent)
+      case JsArray(x)  => printArray(x, sb, indent)
+      case _ => printLeaf(x, sb)
+    }
+  }
+
+  protected def organiseMembers(members: Map[String, JsValue]): Seq[(String, JsValue)] = members.toSeq
+
+  protected def printObject(members: Map[String, JsValue], sb: StringBuilder, indent: Int): Unit = {
+    sb.append("{\n")    
+    printSeq(organiseMembers(members), sb.append(",\n")) { m =>
+      printIndent(sb, indent + Indent)
+      printString(m._1, sb)
+      sb.append(": ")
+      print(m._2, sb, indent + Indent)
+    }
+    sb.append('\n')
+    printIndent(sb, indent)
+    sb.append("}")
+  }
+  
+  protected def printArray(elements: Seq[JsValue], sb: StringBuilder, indent: Int): Unit = {
+    sb.append('[')
+    printSeq(elements, sb.append(", "))(print(_, sb, indent))
+    sb.append(']')
+  }
+  
+  protected def printIndent(sb: StringBuilder, indent: Int): Unit = {
+    @tailrec def rec(indent: Int): Unit =
+      if (indent > 0) {
+        sb.append(' ')
+        rec(indent - 1)
+      }
+    rec(indent)
+  }
+}
+
+object PrettyPrinter extends PrettyPrinter
+\ No newline at end of file