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gecko-dev/mobile/android/chrome/content/JSDOMParser.js

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/* 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/. */
/**
* This is a relatively lightweight DOMParser that is safe to use in a web
* worker. This is far from a complete DOM implementation; however, it should
* contain the minimal set of functionality necessary for Readability.js.
*
* Aside from not implementing the full DOM API, there are other quirks to be
* aware of when using the JSDOMParser:
*
* 1) Properly formed HTML/XML must be used. This means you should be extra
* careful when using this parser on anything received directly from an
* XMLHttpRequest. Providing a serialized string from an XMLSerializer,
* however, should be safe (since the browser's XMLSerializer should
* generate valid HTML/XML). Therefore, if parsing a document from an XHR,
* the recommended approach is to do the XHR in the main thread, use
* XMLSerializer.serializeToString() on the responseXML, and pass the
* resulting string to the worker.
*
* 2) Live NodeLists are not supported. DOM methods and properties such as
* getElementsByTagName() and childNodes return standard arrays. If you
* want these lists to be updated when nodes are removed or added to the
* document, you must take care to manually update them yourself.
*/
(function (global) {
function error(m) {
dump("JSDOMParser error: " + m);
}
// When a style is set in JS, map it to the corresponding CSS attribute
let styleMap = {
"alignmentBaseline": "alignment-baseline",
"background": "background",
"backgroundAttachment": "background-attachment",
"backgroundClip": "background-clip",
"backgroundColor": "background-color",
"backgroundImage": "background-image",
"backgroundOrigin": "background-origin",
"backgroundPosition": "background-position",
"backgroundPositionX": "background-position-x",
"backgroundPositionY": "background-position-y",
"backgroundRepeat": "background-repeat",
"backgroundRepeatX": "background-repeat-x",
"backgroundRepeatY": "background-repeat-y",
"backgroundSize": "background-size",
"baselineShift": "baseline-shift",
"border": "border",
"borderBottom": "border-bottom",
"borderBottomColor": "border-bottom-color",
"borderBottomLeftRadius": "border-bottom-left-radius",
"borderBottomRightRadius": "border-bottom-right-radius",
"borderBottomStyle": "border-bottom-style",
"borderBottomWidth": "border-bottom-width",
"borderCollapse": "border-collapse",
"borderColor": "border-color",
"borderImage": "border-image",
"borderImageOutset": "border-image-outset",
"borderImageRepeat": "border-image-repeat",
"borderImageSlice": "border-image-slice",
"borderImageSource": "border-image-source",
"borderImageWidth": "border-image-width",
"borderLeft": "border-left",
"borderLeftColor": "border-left-color",
"borderLeftStyle": "border-left-style",
"borderLeftWidth": "border-left-width",
"borderRadius": "border-radius",
"borderRight": "border-right",
"borderRightColor": "border-right-color",
"borderRightStyle": "border-right-style",
"borderRightWidth": "border-right-width",
"borderSpacing": "border-spacing",
"borderStyle": "border-style",
"borderTop": "border-top",
"borderTopColor": "border-top-color",
"borderTopLeftRadius": "border-top-left-radius",
"borderTopRightRadius": "border-top-right-radius",
"borderTopStyle": "border-top-style",
"borderTopWidth": "border-top-width",
"borderWidth": "border-width",
"bottom": "bottom",
"boxShadow": "box-shadow",
"boxSizing": "box-sizing",
"captionSide": "caption-side",
"clear": "clear",
"clip": "clip",
"clipPath": "clip-path",
"clipRule": "clip-rule",
"color": "color",
"colorInterpolation": "color-interpolation",
"colorInterpolationFilters": "color-interpolation-filters",
"colorProfile": "color-profile",
"colorRendering": "color-rendering",
"content": "content",
"counterIncrement": "counter-increment",
"counterReset": "counter-reset",
"cursor": "cursor",
"direction": "direction",
"display": "display",
"dominantBaseline": "dominant-baseline",
"emptyCells": "empty-cells",
"enableBackground": "enable-background",
"fill": "fill",
"fillOpacity": "fill-opacity",
"fillRule": "fill-rule",
"filter": "filter",
"cssFloat": "float",
"floodColor": "flood-color",
"floodOpacity": "flood-opacity",
"font": "font",
"fontFamily": "font-family",
"fontSize": "font-size",
"fontStretch": "font-stretch",
"fontStyle": "font-style",
"fontVariant": "font-variant",
"fontWeight": "font-weight",
"glyphOrientationHorizontal": "glyph-orientation-horizontal",
"glyphOrientationVertical": "glyph-orientation-vertical",
"height": "height",
"imageRendering": "image-rendering",
"kerning": "kerning",
"left": "left",
"letterSpacing": "letter-spacing",
"lightingColor": "lighting-color",
"lineHeight": "line-height",
"listStyle": "list-style",
"listStyleImage": "list-style-image",
"listStylePosition": "list-style-position",
"listStyleType": "list-style-type",
"margin": "margin",
"marginBottom": "margin-bottom",
"marginLeft": "margin-left",
"marginRight": "margin-right",
"marginTop": "margin-top",
"marker": "marker",
"markerEnd": "marker-end",
"markerMid": "marker-mid",
"markerStart": "marker-start",
"mask": "mask",
"maxHeight": "max-height",
"maxWidth": "max-width",
"minHeight": "min-height",
"minWidth": "min-width",
"opacity": "opacity",
"orphans": "orphans",
"outline": "outline",
"outlineColor": "outline-color",
"outlineOffset": "outline-offset",
"outlineStyle": "outline-style",
"outlineWidth": "outline-width",
"overflow": "overflow",
"overflowX": "overflow-x",
"overflowY": "overflow-y",
"padding": "padding",
"paddingBottom": "padding-bottom",
"paddingLeft": "padding-left",
"paddingRight": "padding-right",
"paddingTop": "padding-top",
"page": "page",
"pageBreakAfter": "page-break-after",
"pageBreakBefore": "page-break-before",
"pageBreakInside": "page-break-inside",
"pointerEvents": "pointer-events",
"position": "position",
"quotes": "quotes",
"resize": "resize",
"right": "right",
"shapeRendering": "shape-rendering",
"size": "size",
"speak": "speak",
"src": "src",
"stopColor": "stop-color",
"stopOpacity": "stop-opacity",
"stroke": "stroke",
"strokeDasharray": "stroke-dasharray",
"strokeDashoffset": "stroke-dashoffset",
"strokeLinecap": "stroke-linecap",
"strokeLinejoin": "stroke-linejoin",
"strokeMiterlimit": "stroke-miterlimit",
"strokeOpacity": "stroke-opacity",
"strokeWidth": "stroke-width",
"tableLayout": "table-layout",
"textAlign": "text-align",
"textAnchor": "text-anchor",
"textDecoration": "text-decoration",
"textIndent": "text-indent",
"textLineThrough": "text-line-through",
"textLineThroughColor": "text-line-through-color",
"textLineThroughMode": "text-line-through-mode",
"textLineThroughStyle": "text-line-through-style",
"textLineThroughWidth": "text-line-through-width",
"textOverflow": "text-overflow",
"textOverline": "text-overline",
"textOverlineColor": "text-overline-color",
"textOverlineMode": "text-overline-mode",
"textOverlineStyle": "text-overline-style",
"textOverlineWidth": "text-overline-width",
"textRendering": "text-rendering",
"textShadow": "text-shadow",
"textTransform": "text-transform",
"textUnderline": "text-underline",
"textUnderlineColor": "text-underline-color",
"textUnderlineMode": "text-underline-mode",
"textUnderlineStyle": "text-underline-style",
"textUnderlineWidth": "text-underline-width",
"top": "top",
"unicodeBidi": "unicode-bidi",
"unicodeRange": "unicode-range",
"vectorEffect": "vector-effect",
"verticalAlign": "vertical-align",
"visibility": "visibility",
"whiteSpace": "white-space",
"widows": "widows",
"width": "width",
"wordBreak": "word-break",
"wordSpacing": "word-spacing",
"wordWrap": "word-wrap",
"writingMode": "writing-mode",
"zIndex": "z-index",
"zoom": "zoom",
};
// Elements that can be self-closing
let voidElems = {
"area": true,
"base": true,
"br": true,
"col": true,
"command": true,
"embed": true,
"hr": true,
"img": true,
"input": true,
"link": true,
"meta": true,
"param": true,
"source": true,
};
// See http://www.w3schools.com/dom/dom_nodetype.asp
let nodeTypes = {
ELEMENT_NODE: 1,
ATTRIBUTE_NODE: 2,
TEXT_NODE: 3,
CDATA_SECTION_NODE: 4,
ENTITY_REFERENCE_NODE: 5,
ENTITY_NODE: 6,
PROCESSING_INSTRUCTION_NODE: 7,
COMMENT_NODE: 8,
DOCUMENT_NODE: 9,
DOCUMENT_TYPE_NODE: 10,
DOCUMENT_FRAGMENT_NODE: 11,
NOTATION_NODE: 12
};
function getElementsByTagName(tag) {
tag = tag.toUpperCase();
let elems = [];
let allTags = (tag === "*");
function getElems(node) {
let length = node.childNodes.length;
for (let i = 0; i < length; i++) {
let child = node.childNodes[i];
if (child.nodeType !== 1)
continue;
if (allTags || (child.tagName === tag))
elems.push(child);
getElems(child);
}
}
getElems(this);
return elems;
}
let Node = function () {};
Node.prototype = {
attributes: null,
childNodes: null,
localName: null,
nodeName: null,
parentNode: null,
textContent: null,
get firstChild() {
return this.childNodes[0] || null;
},
get nextSibling() {
if (this.parentNode) {
let childNodes = this.parentNode.childNodes;
return childNodes[childNodes.indexOf(this) + 1] || null;
}
return null;
},
appendChild: function (child) {
if (child.parentNode) {
child.parentNode.removeChild(child);
}
this.childNodes.push(child);
child.parentNode = this;
},
removeChild: function (child) {
let childNodes = this.childNodes;
let childIndex = childNodes.indexOf(child);
if (childIndex === -1) {
throw "removeChild: node not found";
} else {
child.parentNode = null;
return childNodes.splice(childIndex, 1)[0];
}
},
replaceChild: function (newNode, oldNode) {
let childNodes = this.childNodes;
let childIndex = childNodes.indexOf(oldNode);
if (childIndex === -1) {
throw "replaceChild: node not found";
} else {
if (newNode.parentNode)
newNode.parentNode.removeChild(newNode);
childNodes[childIndex] = newNode;
newNode.parentNode = this;
oldNode.parentNode = null;
return oldNode;
}
}
};
for (let i in nodeTypes) {
Node[i] = Node.prototype[i] = nodeTypes[i];
}
let Attribute = function (name, value) {
this.name = name;
this.value = value;
};
let Comment = function () {
this.childNodes = [];
};
Comment.prototype = {
__proto__: Node.prototype,
nodeName: "#comment",
nodeType: Node.COMMENT_NODE
};
let Text = function () {
this.childNodes = [];
};
Text.prototype = {
__proto__: Node.prototype,
nodeName: "#text",
nodeType: Node.TEXT_NODE,
textContent: ""
}
let Document = function () {
this.styleSheets = [];
this.childNodes = [];
};
Document.prototype = {
__proto__: Node.prototype,
nodeName: "#document",
nodeType: Node.DOCUMENT_NODE,
title: "",
getElementsByTagName: getElementsByTagName,
getElementById: function (id) {
function getElem(node) {
let length = node.childNodes.length;
if (node.id === id)
return node;
for (let i = 0; i < length; i++) {
let el = getElem(node.childNodes[i]);
if (el)
return el;
}
return null;
}
return getElem(this);
},
createElement: function (tag) {
let node = new Element(tag);
return node;
}
};
let Element = function (tag) {
this.attributes = [];
this.childNodes = [];
this.localName = tag.toLowerCase();
this.tagName = tag.toUpperCase();
this.style = new Style(this);
};
Element.prototype = {
__proto__: Node.prototype,
nodeType: Node.ELEMENT_NODE,
getElementsByTagName: getElementsByTagName,
get className() {
return this.getAttribute("class") || "";
},
set className(str) {
this.setAttribute("class", str);
},
get id() {
return this.getAttribute("id") || "";
},
set id(str) {
this.setAttribute("id", str);
},
get href() {
return this.getAttribute("href") || "";
},
set href(str) {
this.setAttribute("href", str);
},
get src() {
return this.getAttribute("src") || "";
},
set src(str) {
this.setAttribute("src", str);
},
get nodeName() {
return this.tagName;
},
get innerHTML() {
function getHTML(node) {
let i = 0;
for (i = 0; i < node.childNodes.length; i++) {
let child = node.childNodes[i];
if (child.localName) {
arr.push("<" + child.localName);
// serialize attribute list
for (let j = 0; j < child.attributes.length; j++) {
let attr = child.attributes[j];
let quote = (attr.value.indexOf('"') === -1 ? '"' : "'");
arr.push(" " + attr.name + '=' + quote + attr.value + quote);
}
if (child.localName in voidElems) {
// if this is a self-closing element, end it here
arr.push("/>");
} else {
// otherwise, add its children
arr.push(">");
getHTML(child);
arr.push("</" + child.localName + ">");
}
} else {
arr.push(child.textContent);
}
}
}
// Using Array.join() avoids the overhead from lazy string concatenation.
// See http://blog.cdleary.com/2012/01/string-representation-in-spidermonkey/#ropes
let arr = [];
getHTML(this);
return arr.join("");
},
set innerHTML(html) {
let parser = new JSDOMParser();
let node = parser.parse(html);
for (let i = this.childNodes.length; --i >= 0;) {
this.childNodes[i].parentNode = null;
}
this.childNodes = node.childNodes;
for (let i = this.childNodes.length; --i >= 0;) {
this.childNodes[i].parentNode = this;
}
},
set textContent(text) {
// clear parentNodes for existing children
for (let i = this.childNodes.length; --i >= 0;) {
this.childNodes[i].parentNode = null;
}
let node = new Text();
this.childNodes = [ node ];
node.textContent = text;
node.parentNode = this;
},
get textContent() {
function getText(node) {
let nodes = node.childNodes;
for (let i = 0; i < nodes.length; i++) {
let child = nodes[i];
if (child.nodeType === 3) {
text.push(child.textContent);
} else {
getText(child);
}
}
}
// Using Array.join() avoids the overhead from lazy string concatenation.
// See http://blog.cdleary.com/2012/01/string-representation-in-spidermonkey/#ropes
let text = [];
getText(this);
return text.join("");
},
getAttribute: function (name) {
for (let i = this.attributes.length; --i >= 0;) {
let attr = this.attributes[i];
if (attr.name === name)
return attr.value;
}
return undefined;
},
setAttribute: function (name, value) {
for (let i = this.attributes.length; --i >= 0;) {
let attr = this.attributes[i];
if (attr.name === name) {
attr.value = value;
return;
}
}
this.attributes.push(new Attribute(name, value));
},
removeAttribute: function (name) {
for (let i = this.attributes.length; --i >= 0;) {
let attr = this.attributes[i];
if (attr.name === name) {
this.attributes.splice(i, 1);
break;
}
}
}
};
let Style = function (node) {
this.node = node;
};
// getStyle() and setStyle() use the style attribute string directly. This
// won't be very efficient if there are a lot of style manipulations, but
// it's the easiest way to make sure the style attribute string and the JS
// style property stay in sync. Readability.js doesn't do many style
// manipulations, so this should be okay.
Style.prototype = {
getStyle: function (styleName) {
let attr = this.node.getAttribute("style");
if (!attr)
return undefined;
let styles = attr.value.split(";");
for (let i = 0; i < styles.length; i++) {
let style = styles[i].split(":");
let name = style[0].trim();
if (name === styleName)
return style[1].trim();
}
return undefined;
},
setStyle: function (styleName, styleValue) {
let attr = this.node.getAttribute("style");
let value = (attr ? attr.value : "");
let index = 0;
do {
let next = value.indexOf(";", index) + 1;
let length = next - index - 1;
let style = (length > 0 ? value.substr(index, length) : value.substr(index));
if (style.substr(0, style.indexOf(":")).trim() === styleName) {
value = value.substr(0, index).trim() + (next ? " " + value.substr(next).trim() : "");
break;
}
index = next;
} while (index);
value += " " + styleName + ": " + styleValue + ";";
this.node.setAttribute("style", value.trim());
}
};
// For each item in styleMap, define a getter and setter on the style
// property.
for (let jsName in styleMap) {
(function (cssName) {
Style.prototype.__defineGetter__(jsName, function () {
return this.getStyle(cssName);
});
Style.prototype.__defineSetter__(jsName, function (value) {
this.setStyle(cssName, value);
});
}) (styleMap[jsName]);
}
let JSDOMParser = function () {
this.currentChar = 0;
};
JSDOMParser.prototype = {
/**
* Look at the next character without advancing the index.
*/
peekNext: function () {
return this.html[this.currentChar];
},
/**
* Get the next character and advance the index.
*/
nextChar: function () {
return this.html[this.currentChar++];
},
/**
* Called after a quote character is read. This finds the next quote
* character and returns the text string in between.
*/
readString: function (quote) {
let str;
let n = this.html.indexOf(quote, this.currentChar);
if (n === -1) {
this.currentChar = this.html.length;
str = null;
} else {
str = this.html.substring(this.currentChar, n);
this.currentChar = n + 1;
}
return str;
},
/**
* Called when parsing a node. This finds the next name/value attribute
* pair and adds the result to the attributes list.
*/
readAttribute: function (node) {
let name = "";
let n = this.html.indexOf("=", this.currentChar);
if (n === -1) {
this.currentChar = this.html.length;
} else {
// Read until a '=' character is hit; this will be the attribute key
name = this.html.substring(this.currentChar, n);
this.currentChar = n + 1;
}
if (!name)
return;
// After a '=', we should see a '"' for the attribute value
let c = this.nextChar();
if (c !== '"' && c !== "'") {
error("expecting '\"'");
return;
}
// Read the attribute value (and consume the matching quote)
let value = this.readString(c);
if (!value)
return;
node.attributes.push(new Attribute(name, value));
return;
},
/**
* Parses and returns an Element node. This is called after a '<' has been
* read.
*
* @returns an array; the first index of the array is the parsed node;
* the second index is a boolean indicating whether this is a void
* Element
*/
makeElementNode: function () {
let c = this.nextChar();
// Read the Element tag name
let tag = "";
while (c !== " " && c !== ">" && c !== "/") {
if (c === undefined)
return null;
tag += c;
c = this.nextChar();
}
if (!tag)
return null;
let node = new Element(tag);
// Read Element attributes
while (c !== "/" && c !== ">") {
if (c === undefined)
return null;
while (this.match(" "));
c = this.nextChar();
if (c !== "/" && c !== ">") {
--this.currentChar;
this.readAttribute(node);
}
}
// If this is a self-closing tag, read '/>'
let closed = tag in voidElems;
if (c === "/") {
closed = true;
c = this.nextChar();
if (c !== ">") {
error("expected '>'");
return null;
}
}
return [node, closed];
},
/**
* If the current input matches this string, advance the input index;
* otherwise, do nothing.
*
* @returns whether input matched string
*/
match: function (str) {
let strlen = str.length;
if (this.html.substr(this.currentChar, strlen) === str) {
this.currentChar += strlen;
return true;
}
return false;
},
/**
* Searches the input until a string is found and discards all input up to
* and including the matched string.
*/
discardTo: function (str) {
let index = this.html.indexOf(str, this.currentChar) + str.length;
if (index === -1)
this.currentChar = this.html.length;
this.currentChar = index;
},
/**
* Reads child nodes for the given node.
*/
readChildren: function (node) {
let child;
while (child = this.readNode()) {
// Don't keep Comment nodes
if (child.nodeType !== 8) {
node.childNodes.push(child);
child.parentNode = node;
}
}
},
/**
* Reads the next child node from the input. If we're reading a closing
* tag, or if we've reached the end of input, return null.
*
* @returns the node
*/
readNode: function () {
let c = this.nextChar();
if (c === undefined)
return null;
// Read any text as Text node
if (c !== "<") {
--this.currentChar;
let node = new Text();
let n = this.html.indexOf("<", this.currentChar);
if (n === -1) {
node.textContent = this.html.substring(this.currentChar, this.html.length);
this.currentChar = this.html.length;
} else {
node.textContent = this.html.substring(this.currentChar, n);
this.currentChar = n;
}
return node;
}
c = this.peekNext();
// Read Comment node. Normally, Comment nodes know their inner
// textContent, but we don't really care about Comment nodes (we throw
// them away in readChildren()). So just returning an empty Comment node
// here is sufficient.
if (c === "!" || c === "?") {
this.currentChar++;
if (this.match("--")) {
this.discardTo("-->");
} else {
let c = this.nextChar();
while (c !== ">") {
if (c === undefined)
return null;
if (c === '"' || c === "'")
this.readString(c);
c = this.nextChar();
}
}
return new Comment();
}
// If we're reading a closing tag, return null. This means we've reached
// the end of this set of child nodes.
if (c === "/") {
--this.currentChar;
return null;
}
// Otherwise, we're looking at an Element node
let result = this.makeElementNode();
if (result === null)
return null;
let [node, closed] = result;
let localName = node.localName;
// If this isn't a void Element, read its child nodes
if (!closed) {
this.readChildren(node);
let closingTag = "</" + localName + ">";
if (!this.match(closingTag)) {
error("expected '" + closingTag + "'");
return null;
}
}
if (localName === "title") {
this.doc.title = node.textContent.trim();
} else if (localName === "head") {
this.doc.head = node;
} else if (localName === "body") {
this.doc.body = node;
} else if (localName === "html") {
this.doc.documentElement = node;
}
return node;
},
/**
* Parses an HTML string and returns a JS implementation of the Document.
*/
parse: function (html) {
this.html = html;
let doc = this.doc = new Document();
this.readChildren(doc);
// If this is an HTML document, remove root-level children except for the
// <html> node
if (doc.documentElement) {
for (let i = doc.childNodes.length; --i >= 0;) {
let child = doc.childNodes[i];
if (child !== doc.documentElement) {
doc.removeChild(child);
}
}
}
return doc;
}
};
// Attach the standard DOM types to the global scope
global.Node = Node;
global.Comment = Comment;
global.Document = Document;
global.Element = Element;
global.Text = Text;
// Attach JSDOMParser to the global scope
global.JSDOMParser = JSDOMParser;
}) (this);
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