Generalizing OCBuilder to be able to work over PSI trees

platform/lang-api/src/com/intellij/lang/NodeStructure.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2000-2010 JetBrains s.r.o.
+ *
+ * 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.
+ */
+
+/*
+ * @author max
+ */
+package com.intellij.lang;
+
+import com.intellij.psi.tree.IElementType;
+
+public interface NodeStructure<T> {
+  NodeStructure<LighterASTNode> LIGHTER_NODE_STRUCTURE = new NodeStructure<LighterASTNode>() {
+    public int getStartOffset(LighterASTNode node) {
+      return node.getStartOffset();
+    }
+
+    public int getEndOffset(LighterASTNode node) {
+      return node.getEndOffset();
+    }
+
+    public IElementType getTokenType(LighterASTNode node) {
+      return node.getTokenType();
+    }
+  };
+
+
+  NodeStructure<ASTNode> AST_NODE_STRUCTURE = new NodeStructure<ASTNode>() {
+    public int getStartOffset(ASTNode node) {
+      return node.getTextRange().getStartOffset();
+    }
+
+    public int getEndOffset(ASTNode node) {
+      return node.getTextRange().getEndOffset();
+    }
+
+    public IElementType getTokenType(ASTNode node) {
+      return node.getElementType();
+    }
+  };
+  
+  int getStartOffset(T node);
+  int getEndOffset(T node);
+  IElementType getTokenType(T node);
+}