From b19c3691ece5cc913e16620f8b2ae8d6fdf1404d Mon Sep 17 00:00:00 2001
From: Dennis Ushakov <dennis.ushakov@gmail.com>
Date: Tue, 20 Jan 2015 15:02:40 +0300
Subject: [PATCH] initial implementation of Emmet edit point searching
 (WEB-362)

---
 .../emmet/actions/EmmetEditPointUtil.java     | 88 +++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 xml/impl/src/com/intellij/codeInsight/template/emmet/actions/EmmetEditPointUtil.java

diff --git a/xml/impl/src/com/intellij/codeInsight/template/emmet/actions/EmmetEditPointUtil.java b/xml/impl/src/com/intellij/codeInsight/template/emmet/actions/EmmetEditPointUtil.java
new file mode 100644
index 000000000000..df78333819b5
--- /dev/null
+++ b/xml/impl/src/com/intellij/codeInsight/template/emmet/actions/EmmetEditPointUtil.java
@@ -0,0 +1,88 @@
+/*
+ * Copyright 2000-2015 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.
+ */
+package com.intellij.codeInsight.template.emmet.actions;
+
+import com.intellij.lang.xml.XMLLanguage;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.psi.PsiElement;
+import com.intellij.psi.PsiFile;
+import com.intellij.psi.tree.IElementType;
+import com.intellij.psi.util.PsiTreeUtil;
+import com.intellij.psi.xml.XmlTokenType;
+
+/**
+ * @author Dennis.Ushakov
+ */
+public class EmmetEditPointUtil {
+  public static void moveForward(Editor editor, PsiFile file) {
+    final int offset = editor.getCaretModel().getOffset();
+    PsiElement element = file.findElementAt(offset);
+    if (element == null || !element.getLanguage().isKindOf(XMLLanguage.INSTANCE)) return;
+
+    do {
+      element = PsiTreeUtil.nextLeaf(element);
+    } while (element != null && !isEmptyEditPoint(element));
+
+    moveCaret(editor, element);
+  }
+
+  public static void moveBackward(Editor editor, PsiFile file) {
+    final int offset = editor.getCaretModel().getOffset();
+    PsiElement element = file.findElementAt(offset);
+    element = element == null ? file.findElementAt(offset - 1) : element;
+    if (element == null || !element.getLanguage().isKindOf(XMLLanguage.INSTANCE)) return;
+
+    do {
+      element = PsiTreeUtil.prevLeaf(element);
+    }
+    while (element != null && !isEmptyEditPoint(element));
+
+    moveCaret(editor, element);
+  }
+
+  public static void moveCaret(Editor editor, PsiElement element) {
+    if (element != null) {
+      int offset = element.getTextRange().getStartOffset();
+      if (XmlTokenType.WHITESPACES.contains(element.getNode().getElementType())) {
+        final String text = element.getText();
+        if (text.startsWith("\n")) {
+          final int pos = text.indexOf('\n', 1);
+          offset += pos > 0 ? pos : 1;
+        }
+      }
+      editor.getCaretModel().moveToOffset(offset);
+    }
+  }
+
+  private static boolean isEmptyEditPoint(PsiElement element) {
+    final IElementType type = element.getNode().getElementType();
+    if (type == XmlTokenType.XML_ATTRIBUTE_VALUE_END_DELIMITER) {
+      final PsiElement prev = PsiTreeUtil.prevLeaf(element);
+      return prev != null && prev.getNode().getElementType() == XmlTokenType.XML_ATTRIBUTE_VALUE_START_DELIMITER;
+    }
+    if (type == XmlTokenType.XML_END_TAG_START) {
+      final PsiElement tag = element.getParent();
+      final PsiElement prev = PsiTreeUtil.prevLeaf(element, true);
+      return prev != null && prev.getParent() == tag && prev.getNode().getElementType() == XmlTokenType.XML_TAG_END;
+    }
+    if (XmlTokenType.WHITESPACES.contains(type)) {
+      final PsiElement text = element.getParent();
+      final PsiElement prev = PsiTreeUtil.prevLeaf(element, true);
+      return prev != null && prev.getParent() != text.getParent() && prev.getNode().getElementType() == XmlTokenType.XML_TAG_END;
+    }
+    return false;
+  }
+}