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+// Copyright 2007 The Closure Library Authors. All Rights Reserved.
+//
+// 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.
+
+/**
+ * @fileoverview A utility class for managing editable links.
+ *
+ * @author nicksantos@google.com (Nick Santos)
+ */
+
+goog.provide('goog.editor.Link');
+
+goog.require('goog.dom');
+goog.require('goog.dom.NodeType');
+goog.require('goog.dom.Range');
+goog.require('goog.editor.BrowserFeature');
+goog.require('goog.editor.Command');
+goog.require('goog.editor.node');
+goog.require('goog.editor.range');
+goog.require('goog.string');
+goog.require('goog.string.Unicode');
+goog.require('goog.uri.utils');
+
+
+
+/**
+ * Wrap an editable link.
+ * @param {HTMLAnchorElement} anchor The anchor element.
+ * @param {boolean} isNew Whether this is a new link.
+ * @constructor
+ */
+goog.editor.Link = function(anchor, isNew) {
+  /**
+   * The link DOM element.
+   * @type {HTMLAnchorElement}
+   * @private
+   */
+  this.anchor_ = anchor;
+
+  /**
+   * Whether this link represents a link just added to the document.
+   * @type {boolean}
+   * @private
+   */
+  this.isNew_ = isNew;
+};
+
+
+/**
+ * @return {HTMLAnchorElement} The anchor element.
+ */
+goog.editor.Link.prototype.getAnchor = function() {
+  return this.anchor_;
+};
+
+
+/**
+ * @return {string} The inner text for the anchor.
+ */
+goog.editor.Link.prototype.getCurrentText = function() {
+  if (!this.currentText_) {
+    this.currentText_ = goog.dom.getRawTextContent(this.getAnchor());
+  }
+  return this.currentText_;
+};
+
+
+/**
+ * @return {boolean} Whether the link is new.
+ */
+goog.editor.Link.prototype.isNew = function() {
+  return this.isNew_;
+};
+
+
+/**
+ * Set the url without affecting the isNew() status of the link.
+ * @param {string} url A URL.
+ */
+goog.editor.Link.prototype.initializeUrl = function(url) {
+  this.getAnchor().href = url;
+};
+
+
+/**
+ * Removes the link, leaving its contents in the document.  Note that this
+ * object will no longer be usable/useful after this call.
+ */
+goog.editor.Link.prototype.removeLink = function() {
+  goog.dom.flattenElement(this.anchor_);
+  this.anchor_ = null;
+};
+
+
+/**
+ * Change the link.
+ * @param {string} newText New text for the link. If the link contains all its
+ *     text in one descendent, newText will only replace the text in that
+ *     one node. Otherwise, we'll change the innerHTML of the whole
+ *     link to newText.
+ * @param {string} newUrl A new URL.
+ */
+goog.editor.Link.prototype.setTextAndUrl = function(newText, newUrl) {
+  var anchor = this.getAnchor();
+  anchor.href = newUrl;
+
+  // If the text did not change, don't update link text.
+  var currentText = this.getCurrentText();
+  if (newText != currentText) {
+    var leaf = goog.editor.node.getLeftMostLeaf(anchor);
+    if (leaf.nodeType == goog.dom.NodeType.TEXT) {
+      leaf = leaf.parentNode;
+    }
+
+    if (goog.dom.getRawTextContent(leaf) != currentText) {
+      leaf = anchor;
+    }
+
+    goog.dom.removeChildren(leaf);
+
+    var domHelper = goog.dom.getDomHelper(leaf);
+    goog.dom.appendChild(leaf, domHelper.createTextNode(newText));
+
+    // The text changed, so force getCurrentText to recompute.
+    this.currentText_ = null;
+  }
+
+  this.isNew_ = false;
+};
+
+
+/**
+ * Places the cursor to the right of the anchor.
+ * Note that this is different from goog.editor.range's placeCursorNextTo
+ * in that it specifically handles the placement of a cursor in browsers
+ * that trap you in links, by adding a space when necessary and placing the
+ * cursor after that space.
+ */
+goog.editor.Link.prototype.placeCursorRightOf = function() {
+  var anchor = this.getAnchor();
+  // If the browser gets stuck in a link if we place the cursor next to it,
+  // we'll place the cursor after a space instead.
+  if (goog.editor.BrowserFeature.GETS_STUCK_IN_LINKS) {
+    var spaceNode;
+    var nextSibling = anchor.nextSibling;
+
+    // Check if there is already a space after the link.  Only handle the
+    // simple case - the next node is a text node that starts with a space.
+    if (nextSibling &&
+        nextSibling.nodeType == goog.dom.NodeType.TEXT &&
+        (goog.string.startsWith(nextSibling.data, goog.string.Unicode.NBSP) ||
+         goog.string.startsWith(nextSibling.data, ' '))) {
+      spaceNode = nextSibling;
+    } else {
+      // If there isn't an obvious space to use, create one after the link.
+      var dh = goog.dom.getDomHelper(anchor);
+      spaceNode = dh.createTextNode(goog.string.Unicode.NBSP);
+      goog.dom.insertSiblingAfter(spaceNode, anchor);
+    }
+
+    // Move the selection after the space.
+    var range = goog.dom.Range.createCaret(spaceNode, 1);
+    range.select();
+  } else {
+    goog.editor.range.placeCursorNextTo(anchor, false);
+  }
+};
+
+
+/**
+ * Updates the cursor position and link bubble for this link.
+ * @param {goog.editor.Field} field The field in which the link is created.
+ * @param {string} url The link url.
+ * @private
+ */
+goog.editor.Link.prototype.updateLinkDisplay_ = function(field, url) {
+  this.initializeUrl(url);
+  this.placeCursorRightOf();
+  field.execCommand(goog.editor.Command.UPDATE_LINK_BUBBLE);
+};
+
+
+/**
+ * After link creation, finish creating the link depending on the type
+ * of link being created.
+ * @param {goog.editor.Field} field The field where this link is being created.
+ */
+goog.editor.Link.prototype.finishLinkCreation = function(field) {
+  var text = this.getCurrentText();
+  if (goog.editor.Link.isLikelyUrl(text)) {
+    if (text.search(/:/) < 0) {
+      text = 'http://' + goog.string.trimLeft(text);
+    }
+    this.updateLinkDisplay_(field, text);
+  } else if (goog.editor.Link.isLikelyEmailAddress(text)) {
+    text = 'mailto:' + text;
+    this.updateLinkDisplay_(field, text);
+  } else {
+    field.execCommand(goog.editor.Command.MODAL_LINK_EDITOR, this);
+  }
+};
+
+
+/**
+ * Initialize a new link.
+ * @param {HTMLAnchorElement} anchor The anchor element.
+ * @param {string} url The initial URL.
+ * @param {string=} opt_target The target.
+ * @return {goog.editor.Link} The link.
+ */
+goog.editor.Link.createNewLink = function(anchor, url, opt_target) {
+  var link = new goog.editor.Link(anchor, true);
+  link.initializeUrl(url);
+
+  if (opt_target) {
+    anchor.target = opt_target;
+  }
+
+  return link;
+};
+
+
+/**
+ * Returns true if str could be a URL, false otherwise
+ *
+ * Ex: TR_Util.isLikelyUrl_("http://www.google.com") == true
+ *     TR_Util.isLikelyUrl_("www.google.com") == true
+ *
+ * @param {string} str String to check if it looks like a URL.
+ * @return {boolean} Whether str could be a URL.
+ */
+goog.editor.Link.isLikelyUrl = function(str) {
+  // Whitespace means this isn't a domain.
+  if (/\s/.test(str)) {
+    return false;
+  }
+
+  if (goog.editor.Link.isLikelyEmailAddress(str)) {
+    return false;
+  }
+
+  // Add a scheme if the url doesn't have one - this helps the parser.
+  var addedScheme = false;
+  if (!/^[^:\/?#.]+:/.test(str)) {
+    str = 'http://' + str;
+    addedScheme = true;
+  }
+
+  // Parse the domain.
+  var parts = goog.uri.utils.split(str);
+
+  // Relax the rules for special schemes.
+  var scheme = parts[goog.uri.utils.ComponentIndex.SCHEME];
+  if (goog.array.indexOf(['mailto', 'aim'], scheme) != -1) {
+    return true;
+  }
+
+  // Require domains to contain a '.', unless the domain is fully qualified.
+  var domain = parts[goog.uri.utils.ComponentIndex.DOMAIN];
+  if (!domain || (addedScheme && domain.indexOf('.') == -1)) {
+    return false;
+  }
+
+  // Require http and ftp paths to start with '/'.
+  var path = parts[goog.uri.utils.ComponentIndex.PATH];
+  return !path || path.indexOf('/') == 0;
+};
+
+
+/**
+ * Regular expression that matches strings that could be an email address.
+ * @type {RegExp}
+ * @private
+ */
+goog.editor.Link.LIKELY_EMAIL_ADDRESS_ = new RegExp(
+    '^' +                     // Test from start of string
+    '[\\w-]+(\\.[\\w-]+)*' +  // Dot-delimited alphanumerics and dashes (name)
+    '\\@' +                   // @
+    '([\\w-]+\\.)+' +         // Alphanumerics, dashes and dots (domain)
+    '(\\d+|\\w\\w+)$',        // Domain ends in at least one number or 2 letters
+    'i');
+
+
+/**
+ * Returns true if str could be an email address, false otherwise
+ *
+ * Ex: goog.editor.Link.isLikelyEmailAddress_("some word") == false
+ *     goog.editor.Link.isLikelyEmailAddress_("foo@foo.com") == true
+ *
+ * @param {string} str String to test for being email address.
+ * @return {boolean} Whether "str" looks like an email address.
+ */
+goog.editor.Link.isLikelyEmailAddress = function(str) {
+  return goog.editor.Link.LIKELY_EMAIL_ADDRESS_.test(str);
+};
+
+
+/**
+ * Determines whether or not a url is an email link.
+ * @param {string} url A url.
+ * @return {boolean} Whether the url is a mailto link.
+ */
+goog.editor.Link.isMailto = function(url) {
+  return !!url && goog.string.startsWith(url, 'mailto:');
+};