added element manipulator for rest line (as injection host for doctest language)

python/rest/resources/META-INF/rest.xml

@@ -19,6 +19,9 @@
 
     <additionalTextAttributes scheme="Default" file="colorSchemes/RestDefault.xml"/>
     <additionalTextAttributes scheme="Darcula" file="colorSchemes/RestDarcula.xml"/>
+
+    <lang.elementManipulator forClass="com.jetbrains.rest.psi.RestLine"
+                             implementationClass="com.jetbrains.rest.psi.RestLineManipulator"/>
   </extensions>
 
   <extensions defaultExtensionNs="com.intellij.spellchecker">

python/rest/src/com/jetbrains/rest/psi/RestLineManipulator.java

@@ -0,0 +1,18 @@
+package com.jetbrains.rest.psi;
+
+import com.intellij.openapi.util.TextRange;
+import com.intellij.psi.AbstractElementManipulator;
+
+/**
+ * User : ktisha
+ */
+public class RestLineManipulator extends AbstractElementManipulator<RestLine> {
+
+  public RestLine handleContentChange(RestLine element, TextRange range, String newContent) {
+    final String oldText = element.getText();
+    final String newText = oldText.substring(0, range.getStartOffset()) + newContent + oldText.substring(range.getEndOffset());
+    element.updateText(newText);
+    return element;
+  }
+
+}