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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const nodeConstants = require("devtools/shared/dom-node-constants");
var EventEmitter = require("devtools/shared/event-emitter");
/**
* API
*
* new Selection(walker=null)
* destroy()
* node (readonly)
* setNode(node, origin="unknown")
*
* Helpers:
*
* window
* document
* isRoot()
* isNode()
* isHTMLNode()
*
* Check the nature of the node:
*
* isElementNode()
* isAttributeNode()
* isTextNode()
* isCDATANode()
* isEntityRefNode()
* isEntityNode()
* isProcessingInstructionNode()
* isCommentNode()
* isDocumentNode()
* isDocumentTypeNode()
* isDocumentFragmentNode()
* isNotationNode()
*
* Events:
* "new-node-front" when the inner node changed
* "attribute-changed" when an attribute is changed
* "detached-front" when the node (or one of its parents) is removed from
* the document
* "reparented" when the node (or one of its parents) is moved under
* a different node
*/
/**
* A Selection object. Hold a reference to a node.
* Includes some helpers, fire some helpful events.
*/
function Selection(walker) {
EventEmitter.decorate(this);
this._onMutations = this._onMutations.bind(this);
this.setWalker(walker);
}
exports.Selection = Selection;
Selection.prototype = {
_walker: null,
_onMutations: function (mutations) {
let attributeChange = false;
let pseudoChange = false;
let detached = false;
let parentNode = null;
for (let m of mutations) {
if (!attributeChange && m.type == "attributes") {
attributeChange = true;
}
if (m.type == "childList") {
if (!detached && !this.isConnected()) {
if (this.isNode()) {
parentNode = m.target;
}
detached = true;
}
}
if (m.type == "pseudoClassLock") {
pseudoChange = true;
}
}
// Fire our events depending on what changed in the mutations array
if (attributeChange) {
this.emit("attribute-changed");
}
if (pseudoChange) {
this.emit("pseudoclass");
}
if (detached) {
this.emit("detached-front", parentNode);
}
},
destroy: function () {
this.setWalker(null);
},
setWalker: function (walker) {
if (this._walker) {
this._walker.off("mutations", this._onMutations);
}
this._walker = walker;
if (this._walker) {
this._walker.on("mutations", this._onMutations);
}
},
setNodeFront: function (value, reason = "unknown") {
this.reason = reason;
// If an inlineTextChild text node is being set, then set it's parent instead.
let parentNode = value && value.parentNode();
if (value && parentNode && parentNode.inlineTextChild === value) {
value = parentNode;
}
this._nodeFront = value;
this.emit("new-node-front", value, this.reason);
},
get documentFront() {
return this._walker.document(this._nodeFront);
},
get nodeFront() {
return this._nodeFront;
},
isRoot: function () {
return this.isNode() &&
this.isConnected() &&
this._nodeFront.isDocumentElement;
},
isNode: function () {
return !!this._nodeFront;
},
isConnected: function () {
let node = this._nodeFront;
if (!node || !node.actorID) {
return false;
}
while (node) {
if (node === this._walker.rootNode) {
return true;
}
node = node.parentNode();
}
return false;
},
isHTMLNode: function () {
let xhtmlNs = "http://www.w3.org/1999/xhtml";
return this.isNode() && this.nodeFront.namespaceURI == xhtmlNs;
},
// Node type
isElementNode: function () {
return this.isNode() && this.nodeFront.nodeType == nodeConstants.ELEMENT_NODE;
},
isPseudoElementNode: function () {
return this.isNode() && this.nodeFront.isPseudoElement;
},
isAnonymousNode: function () {
return this.isNode() && this.nodeFront.isAnonymous;
},
isAttributeNode: function () {
return this.isNode() && this.nodeFront.nodeType == nodeConstants.ATTRIBUTE_NODE;
},
isTextNode: function () {
return this.isNode() && this.nodeFront.nodeType == nodeConstants.TEXT_NODE;
},
isCDATANode: function () {
return this.isNode() && this.nodeFront.nodeType == nodeConstants.CDATA_SECTION_NODE;
},
isEntityRefNode: function () {
return this.isNode() &&
this.nodeFront.nodeType == nodeConstants.ENTITY_REFERENCE_NODE;
},
isEntityNode: function () {
return this.isNode() && this.nodeFront.nodeType == nodeConstants.ENTITY_NODE;
},
isProcessingInstructionNode: function () {
return this.isNode() &&
this.nodeFront.nodeType == nodeConstants.PROCESSING_INSTRUCTION_NODE;
},
isCommentNode: function () {
return this.isNode() &&
this.nodeFront.nodeType == nodeConstants.PROCESSING_INSTRUCTION_NODE;
},
isDocumentNode: function () {
return this.isNode() && this.nodeFront.nodeType == nodeConstants.DOCUMENT_NODE;
},
/**
* @returns true if the selection is the <body> HTML element.
*/
isBodyNode: function () {
return this.isHTMLNode() &&
this.isConnected() &&
this.nodeFront.nodeName === "BODY";
},
/**
* @returns true if the selection is the <head> HTML element.
*/
isHeadNode: function () {
return this.isHTMLNode() &&
this.isConnected() &&
this.nodeFront.nodeName === "HEAD";
},
isDocumentTypeNode: function () {
return this.isNode() && this.nodeFront.nodeType == nodeConstants.DOCUMENT_TYPE_NODE;
},
isDocumentFragmentNode: function () {
return this.isNode() &&
this.nodeFront.nodeType == nodeConstants.DOCUMENT_FRAGMENT_NODE;
},
isNotationNode: function () {
return this.isNode() && this.nodeFront.nodeType == nodeConstants.NOTATION_NODE;
},
};
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