1197 lines
36 KiB
JavaScript
1197 lines
36 KiB
JavaScript
/*eslint-env es6:false*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* This is a relatively lightweight DOMParser that is safe to use in a web
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* worker. This is far from a complete DOM implementation; however, it should
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* contain the minimal set of functionality necessary for Readability.js.
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*
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* Aside from not implementing the full DOM API, there are other quirks to be
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* aware of when using the JSDOMParser:
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*
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* 1) Properly formed HTML/XML must be used. This means you should be extra
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* careful when using this parser on anything received directly from an
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* XMLHttpRequest. Providing a serialized string from an XMLSerializer,
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* however, should be safe (since the browser's XMLSerializer should
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* generate valid HTML/XML). Therefore, if parsing a document from an XHR,
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* the recommended approach is to do the XHR in the main thread, use
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* XMLSerializer.serializeToString() on the responseXML, and pass the
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* resulting string to the worker.
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*
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* 2) Live NodeLists are not supported. DOM methods and properties such as
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* getElementsByTagName() and childNodes return standard arrays. If you
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* want these lists to be updated when nodes are removed or added to the
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* document, you must take care to manually update them yourself.
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*/
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(function (global) {
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// XML only defines these and the numeric ones:
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var entityTable = {
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"lt": "<",
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"gt": ">",
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"amp": "&",
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"quot": '"',
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"apos": "'",
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};
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var reverseEntityTable = {
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"<": "<",
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">": ">",
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"&": "&",
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'"': """,
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"'": "'",
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};
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function encodeTextContentHTML(s) {
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return s.replace(/[&<>]/g, function(x) {
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return reverseEntityTable[x];
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});
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}
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function encodeHTML(s) {
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return s.replace(/[&<>'"]/g, function(x) {
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return reverseEntityTable[x];
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});
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}
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function decodeHTML(str) {
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return str.replace(/&(quot|amp|apos|lt|gt);/g, function(match, tag) {
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return entityTable[tag];
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}).replace(/&#(?:x([0-9a-z]{1,4})|([0-9]{1,4}));/gi, function(match, hex, numStr) {
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var num = parseInt(hex || numStr, hex ? 16 : 10); // read num
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return String.fromCharCode(num);
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});
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}
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// When a style is set in JS, map it to the corresponding CSS attribute
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var styleMap = {
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"alignmentBaseline": "alignment-baseline",
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"background": "background",
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"backgroundAttachment": "background-attachment",
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"backgroundClip": "background-clip",
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"backgroundColor": "background-color",
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"backgroundImage": "background-image",
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"backgroundOrigin": "background-origin",
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"backgroundPosition": "background-position",
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"backgroundPositionX": "background-position-x",
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"backgroundPositionY": "background-position-y",
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"backgroundRepeat": "background-repeat",
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"backgroundRepeatX": "background-repeat-x",
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"backgroundRepeatY": "background-repeat-y",
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"backgroundSize": "background-size",
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"baselineShift": "baseline-shift",
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"border": "border",
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"borderBottom": "border-bottom",
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"borderBottomColor": "border-bottom-color",
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"borderBottomLeftRadius": "border-bottom-left-radius",
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"borderBottomRightRadius": "border-bottom-right-radius",
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"borderBottomStyle": "border-bottom-style",
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"borderBottomWidth": "border-bottom-width",
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"borderCollapse": "border-collapse",
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"borderColor": "border-color",
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"borderImage": "border-image",
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"borderImageOutset": "border-image-outset",
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"borderImageRepeat": "border-image-repeat",
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"borderImageSlice": "border-image-slice",
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"borderImageSource": "border-image-source",
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"borderImageWidth": "border-image-width",
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"borderLeft": "border-left",
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"borderLeftColor": "border-left-color",
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"borderLeftStyle": "border-left-style",
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"borderLeftWidth": "border-left-width",
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"borderRadius": "border-radius",
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"borderRight": "border-right",
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"borderRightColor": "border-right-color",
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"borderRightStyle": "border-right-style",
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"borderRightWidth": "border-right-width",
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"borderSpacing": "border-spacing",
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"borderStyle": "border-style",
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"borderTop": "border-top",
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"borderTopColor": "border-top-color",
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"borderTopLeftRadius": "border-top-left-radius",
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"borderTopRightRadius": "border-top-right-radius",
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"borderTopStyle": "border-top-style",
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"borderTopWidth": "border-top-width",
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"borderWidth": "border-width",
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"bottom": "bottom",
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"boxShadow": "box-shadow",
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"boxSizing": "box-sizing",
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"captionSide": "caption-side",
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"clear": "clear",
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"clip": "clip",
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"clipPath": "clip-path",
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"clipRule": "clip-rule",
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"color": "color",
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"colorInterpolation": "color-interpolation",
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"colorInterpolationFilters": "color-interpolation-filters",
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"colorProfile": "color-profile",
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"colorRendering": "color-rendering",
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"content": "content",
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"counterIncrement": "counter-increment",
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"counterReset": "counter-reset",
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"cursor": "cursor",
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"direction": "direction",
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"display": "display",
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"dominantBaseline": "dominant-baseline",
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"emptyCells": "empty-cells",
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"enableBackground": "enable-background",
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"fill": "fill",
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"fillOpacity": "fill-opacity",
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"fillRule": "fill-rule",
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"filter": "filter",
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"cssFloat": "float",
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"floodColor": "flood-color",
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"floodOpacity": "flood-opacity",
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"font": "font",
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"fontFamily": "font-family",
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"fontSize": "font-size",
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"fontStretch": "font-stretch",
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"fontStyle": "font-style",
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"fontVariant": "font-variant",
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"fontWeight": "font-weight",
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"glyphOrientationHorizontal": "glyph-orientation-horizontal",
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"glyphOrientationVertical": "glyph-orientation-vertical",
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"height": "height",
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"imageRendering": "image-rendering",
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"kerning": "kerning",
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"left": "left",
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"letterSpacing": "letter-spacing",
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"lightingColor": "lighting-color",
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"lineHeight": "line-height",
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"listStyle": "list-style",
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"listStyleImage": "list-style-image",
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"listStylePosition": "list-style-position",
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"listStyleType": "list-style-type",
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"margin": "margin",
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"marginBottom": "margin-bottom",
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"marginLeft": "margin-left",
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"marginRight": "margin-right",
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"marginTop": "margin-top",
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"marker": "marker",
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"markerEnd": "marker-end",
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"markerMid": "marker-mid",
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"markerStart": "marker-start",
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"mask": "mask",
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"maxHeight": "max-height",
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"maxWidth": "max-width",
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"minHeight": "min-height",
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"minWidth": "min-width",
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"opacity": "opacity",
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"orphans": "orphans",
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"outline": "outline",
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"outlineColor": "outline-color",
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"outlineOffset": "outline-offset",
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"outlineStyle": "outline-style",
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"outlineWidth": "outline-width",
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"overflow": "overflow",
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"overflowX": "overflow-x",
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"overflowY": "overflow-y",
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"padding": "padding",
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"paddingBottom": "padding-bottom",
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"paddingLeft": "padding-left",
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"paddingRight": "padding-right",
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"paddingTop": "padding-top",
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"page": "page",
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"pageBreakAfter": "page-break-after",
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"pageBreakBefore": "page-break-before",
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"pageBreakInside": "page-break-inside",
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"pointerEvents": "pointer-events",
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"position": "position",
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"quotes": "quotes",
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"resize": "resize",
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"right": "right",
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"shapeRendering": "shape-rendering",
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"size": "size",
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"speak": "speak",
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"src": "src",
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"stopColor": "stop-color",
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"stopOpacity": "stop-opacity",
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"stroke": "stroke",
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"strokeDasharray": "stroke-dasharray",
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"strokeDashoffset": "stroke-dashoffset",
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"strokeLinecap": "stroke-linecap",
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"strokeLinejoin": "stroke-linejoin",
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"strokeMiterlimit": "stroke-miterlimit",
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"strokeOpacity": "stroke-opacity",
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"strokeWidth": "stroke-width",
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"tableLayout": "table-layout",
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"textAlign": "text-align",
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"textAnchor": "text-anchor",
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"textDecoration": "text-decoration",
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"textIndent": "text-indent",
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"textLineThrough": "text-line-through",
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"textLineThroughColor": "text-line-through-color",
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"textLineThroughMode": "text-line-through-mode",
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"textLineThroughStyle": "text-line-through-style",
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"textLineThroughWidth": "text-line-through-width",
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"textOverflow": "text-overflow",
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"textOverline": "text-overline",
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"textOverlineColor": "text-overline-color",
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"textOverlineMode": "text-overline-mode",
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"textOverlineStyle": "text-overline-style",
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"textOverlineWidth": "text-overline-width",
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"textRendering": "text-rendering",
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"textShadow": "text-shadow",
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"textTransform": "text-transform",
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"textUnderline": "text-underline",
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"textUnderlineColor": "text-underline-color",
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"textUnderlineMode": "text-underline-mode",
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"textUnderlineStyle": "text-underline-style",
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"textUnderlineWidth": "text-underline-width",
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"top": "top",
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"unicodeBidi": "unicode-bidi",
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"unicodeRange": "unicode-range",
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"vectorEffect": "vector-effect",
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"verticalAlign": "vertical-align",
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"visibility": "visibility",
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"whiteSpace": "white-space",
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"widows": "widows",
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"width": "width",
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"wordBreak": "word-break",
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"wordSpacing": "word-spacing",
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"wordWrap": "word-wrap",
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"writingMode": "writing-mode",
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"zIndex": "z-index",
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"zoom": "zoom",
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};
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// Elements that can be self-closing
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var voidElems = {
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"area": true,
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"base": true,
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"br": true,
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"col": true,
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"command": true,
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"embed": true,
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"hr": true,
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"img": true,
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"input": true,
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"link": true,
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"meta": true,
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"param": true,
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"source": true,
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"wbr": true
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};
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var whitespace = [" ", "\t", "\n", "\r"];
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// See https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
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var nodeTypes = {
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ELEMENT_NODE: 1,
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ATTRIBUTE_NODE: 2,
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TEXT_NODE: 3,
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CDATA_SECTION_NODE: 4,
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ENTITY_REFERENCE_NODE: 5,
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ENTITY_NODE: 6,
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PROCESSING_INSTRUCTION_NODE: 7,
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COMMENT_NODE: 8,
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DOCUMENT_NODE: 9,
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DOCUMENT_TYPE_NODE: 10,
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DOCUMENT_FRAGMENT_NODE: 11,
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NOTATION_NODE: 12
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};
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function getElementsByTagName(tag) {
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tag = tag.toUpperCase();
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var elems = [];
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var allTags = (tag === "*");
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function getElems(node) {
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var length = node.children.length;
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for (var i = 0; i < length; i++) {
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var child = node.children[i];
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if (allTags || (child.tagName === tag))
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elems.push(child);
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getElems(child);
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}
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}
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getElems(this);
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elems._isLiveNodeList = true;
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return elems;
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}
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var Node = function () {};
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Node.prototype = {
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attributes: null,
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childNodes: null,
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localName: null,
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nodeName: null,
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parentNode: null,
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textContent: null,
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nextSibling: null,
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previousSibling: null,
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get firstChild() {
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return this.childNodes[0] || null;
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},
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get firstElementChild() {
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return this.children[0] || null;
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},
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get lastChild() {
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return this.childNodes[this.childNodes.length - 1] || null;
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},
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get lastElementChild() {
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return this.children[this.children.length - 1] || null;
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},
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appendChild: function (child) {
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if (child.parentNode) {
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child.parentNode.removeChild(child);
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}
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var last = this.lastChild;
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if (last)
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last.nextSibling = child;
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child.previousSibling = last;
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if (child.nodeType === Node.ELEMENT_NODE) {
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child.previousElementSibling = this.children[this.children.length - 1] || null;
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this.children.push(child);
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child.previousElementSibling && (child.previousElementSibling.nextElementSibling = child);
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}
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this.childNodes.push(child);
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child.parentNode = this;
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},
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removeChild: function (child) {
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var childNodes = this.childNodes;
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var childIndex = childNodes.indexOf(child);
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if (childIndex === -1) {
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throw "removeChild: node not found";
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} else {
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child.parentNode = null;
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var prev = child.previousSibling;
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var next = child.nextSibling;
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if (prev)
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prev.nextSibling = next;
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if (next)
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next.previousSibling = prev;
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if (child.nodeType === Node.ELEMENT_NODE) {
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prev = child.previousElementSibling;
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next = child.nextElementSibling;
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if (prev)
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prev.nextElementSibling = next;
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if (next)
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next.previousElementSibling = prev;
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this.children.splice(this.children.indexOf(child), 1);
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}
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child.previousSibling = child.nextSibling = null;
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child.previousElementSibling = child.nextElementSibling = null;
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return childNodes.splice(childIndex, 1)[0];
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}
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},
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replaceChild: function (newNode, oldNode) {
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var childNodes = this.childNodes;
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var childIndex = childNodes.indexOf(oldNode);
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if (childIndex === -1) {
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throw "replaceChild: node not found";
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} else {
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// This will take care of updating the new node if it was somewhere else before:
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if (newNode.parentNode)
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newNode.parentNode.removeChild(newNode);
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childNodes[childIndex] = newNode;
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// update the new node's sibling properties, and its new siblings' sibling properties
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newNode.nextSibling = oldNode.nextSibling;
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newNode.previousSibling = oldNode.previousSibling;
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if (newNode.nextSibling)
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newNode.nextSibling.previousSibling = newNode;
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if (newNode.previousSibling)
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newNode.previousSibling.nextSibling = newNode;
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newNode.parentNode = this;
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// Now deal with elements before we clear out those values for the old node,
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// because it can help us take shortcuts here:
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if (newNode.nodeType === Node.ELEMENT_NODE) {
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if (oldNode.nodeType === Node.ELEMENT_NODE) {
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// Both were elements, which makes this easier, we just swap things out:
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newNode.previousElementSibling = oldNode.previousElementSibling;
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newNode.nextElementSibling = oldNode.nextElementSibling;
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if (newNode.previousElementSibling)
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newNode.previousElementSibling.nextElementSibling = newNode;
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if (newNode.nextElementSibling)
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newNode.nextElementSibling.previousElementSibling = newNode;
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this.children[this.children.indexOf(oldNode)] = newNode;
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} else {
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// Hard way:
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newNode.previousElementSibling = (function() {
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for (var i = childIndex - 1; i >= 0; i--) {
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if (childNodes[i].nodeType === Node.ELEMENT_NODE)
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return childNodes[i];
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}
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return null;
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})();
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if (newNode.previousElementSibling) {
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newNode.nextElementSibling = newNode.previousElementSibling.nextElementSibling;
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} else {
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newNode.nextElementSibling = (function() {
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for (var i = childIndex + 1; i < childNodes.length; i++) {
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if (childNodes[i].nodeType === Node.ELEMENT_NODE)
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return childNodes[i];
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}
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return null;
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})();
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}
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if (newNode.previousElementSibling)
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newNode.previousElementSibling.nextElementSibling = newNode;
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if (newNode.nextElementSibling)
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newNode.nextElementSibling.previousElementSibling = newNode;
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if (newNode.nextElementSibling)
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this.children.splice(this.children.indexOf(newNode.nextElementSibling), 0, newNode);
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else
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this.children.push(newNode);
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}
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} else if (oldNode.nodeType === Node.ELEMENT_NODE) {
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// new node is not an element node.
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// if the old one was, update its element siblings:
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if (oldNode.previousElementSibling)
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oldNode.previousElementSibling.nextElementSibling = oldNode.nextElementSibling;
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if (oldNode.nextElementSibling)
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oldNode.nextElementSibling.previousElementSibling = oldNode.previousElementSibling;
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this.children.splice(this.children.indexOf(oldNode), 1);
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// If the old node wasn't an element, neither the new nor the old node was an element,
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// and the children array and its members shouldn't need any updating.
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}
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oldNode.parentNode = null;
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oldNode.previousSibling = null;
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oldNode.nextSibling = null;
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if (oldNode.nodeType === Node.ELEMENT_NODE) {
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oldNode.previousElementSibling = null;
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oldNode.nextElementSibling = null;
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}
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return oldNode;
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}
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},
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__JSDOMParser__: true,
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};
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for (var nodeType in nodeTypes) {
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Node[nodeType] = Node.prototype[nodeType] = nodeTypes[nodeType];
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}
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var Attribute = function (name, value) {
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this.name = name;
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this._value = value;
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};
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Attribute.prototype = {
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|
get value() {
|
|
return this._value;
|
|
},
|
|
setValue: function(newValue) {
|
|
this._value = newValue;
|
|
},
|
|
getEncodedValue: function() {
|
|
return encodeHTML(this._value);
|
|
},
|
|
};
|
|
|
|
var Comment = function () {
|
|
this.childNodes = [];
|
|
};
|
|
|
|
Comment.prototype = {
|
|
__proto__: Node.prototype,
|
|
|
|
nodeName: "#comment",
|
|
nodeType: Node.COMMENT_NODE
|
|
};
|
|
|
|
var Text = function () {
|
|
this.childNodes = [];
|
|
};
|
|
|
|
Text.prototype = {
|
|
__proto__: Node.prototype,
|
|
|
|
nodeName: "#text",
|
|
nodeType: Node.TEXT_NODE,
|
|
get textContent() {
|
|
if (typeof this._textContent === "undefined") {
|
|
this._textContent = decodeHTML(this._innerHTML || "");
|
|
}
|
|
return this._textContent;
|
|
},
|
|
get innerHTML() {
|
|
if (typeof this._innerHTML === "undefined") {
|
|
this._innerHTML = encodeTextContentHTML(this._textContent || "");
|
|
}
|
|
return this._innerHTML;
|
|
},
|
|
|
|
set innerHTML(newHTML) {
|
|
this._innerHTML = newHTML;
|
|
delete this._textContent;
|
|
},
|
|
set textContent(newText) {
|
|
this._textContent = newText;
|
|
delete this._innerHTML;
|
|
},
|
|
};
|
|
|
|
var Document = function (url) {
|
|
this.documentURI = url;
|
|
this.styleSheets = [];
|
|
this.childNodes = [];
|
|
this.children = [];
|
|
};
|
|
|
|
Document.prototype = {
|
|
__proto__: Node.prototype,
|
|
|
|
nodeName: "#document",
|
|
nodeType: Node.DOCUMENT_NODE,
|
|
title: "",
|
|
|
|
getElementsByTagName: getElementsByTagName,
|
|
|
|
getElementById: function (id) {
|
|
function getElem(node) {
|
|
var length = node.children.length;
|
|
if (node.id === id)
|
|
return node;
|
|
for (var i = 0; i < length; i++) {
|
|
var el = getElem(node.children[i]);
|
|
if (el)
|
|
return el;
|
|
}
|
|
return null;
|
|
}
|
|
return getElem(this);
|
|
},
|
|
|
|
createElement: function (tag) {
|
|
var node = new Element(tag);
|
|
return node;
|
|
},
|
|
|
|
createTextNode: function (text) {
|
|
var node = new Text();
|
|
node.textContent = text;
|
|
return node;
|
|
},
|
|
|
|
get baseURI() {
|
|
if (!this.hasOwnProperty("_baseURI")) {
|
|
this._baseURI = this.documentURI;
|
|
var baseElements = this.getElementsByTagName("base");
|
|
var href = baseElements[0] && baseElements[0].getAttribute("href");
|
|
if (href) {
|
|
try {
|
|
this._baseURI = (new URL(href, this._baseURI)).href;
|
|
} catch (ex) {/* Just fall back to documentURI */}
|
|
}
|
|
}
|
|
return this._baseURI;
|
|
},
|
|
};
|
|
|
|
var Element = function (tag) {
|
|
// We use this to find the closing tag.
|
|
this._matchingTag = tag;
|
|
// We're explicitly a non-namespace aware parser, we just pretend it's all HTML.
|
|
var lastColonIndex = tag.lastIndexOf(":");
|
|
if (lastColonIndex != -1) {
|
|
tag = tag.substring(lastColonIndex + 1);
|
|
}
|
|
this.attributes = [];
|
|
this.childNodes = [];
|
|
this.children = [];
|
|
this.nextElementSibling = this.previousElementSibling = null;
|
|
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 srcset() {
|
|
return this.getAttribute("srcset") || "";
|
|
},
|
|
|
|
set srcset(str) {
|
|
this.setAttribute("srcset", str);
|
|
},
|
|
|
|
get nodeName() {
|
|
return this.tagName;
|
|
},
|
|
|
|
get innerHTML() {
|
|
function getHTML(node) {
|
|
var i = 0;
|
|
for (i = 0; i < node.childNodes.length; i++) {
|
|
var child = node.childNodes[i];
|
|
if (child.localName) {
|
|
arr.push("<" + child.localName);
|
|
|
|
// serialize attribute list
|
|
for (var j = 0; j < child.attributes.length; j++) {
|
|
var attr = child.attributes[j];
|
|
// the attribute value will be HTML escaped.
|
|
var val = attr.getEncodedValue();
|
|
var quote = (val.indexOf('"') === -1 ? '"' : "'");
|
|
arr.push(" " + attr.name + "=" + quote + val + quote);
|
|
}
|
|
|
|
if (child.localName in voidElems && !child.childNodes.length) {
|
|
// 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 {
|
|
// This is a text node, so asking for innerHTML won't recurse.
|
|
arr.push(child.innerHTML);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Using Array.join() avoids the overhead from lazy string concatenation.
|
|
var arr = [];
|
|
getHTML(this);
|
|
return arr.join("");
|
|
},
|
|
|
|
set innerHTML(html) {
|
|
var parser = new JSDOMParser();
|
|
var node = parser.parse(html);
|
|
var i;
|
|
for (i = this.childNodes.length; --i >= 0;) {
|
|
this.childNodes[i].parentNode = null;
|
|
}
|
|
this.childNodes = node.childNodes;
|
|
this.children = node.children;
|
|
for (i = this.childNodes.length; --i >= 0;) {
|
|
this.childNodes[i].parentNode = this;
|
|
}
|
|
},
|
|
|
|
set textContent(text) {
|
|
// clear parentNodes for existing children
|
|
for (var i = this.childNodes.length; --i >= 0;) {
|
|
this.childNodes[i].parentNode = null;
|
|
}
|
|
|
|
var node = new Text();
|
|
this.childNodes = [ node ];
|
|
this.children = [];
|
|
node.textContent = text;
|
|
node.parentNode = this;
|
|
},
|
|
|
|
get textContent() {
|
|
function getText(node) {
|
|
var nodes = node.childNodes;
|
|
for (var i = 0; i < nodes.length; i++) {
|
|
var 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
|
|
var text = [];
|
|
getText(this);
|
|
return text.join("");
|
|
},
|
|
|
|
getAttribute: function (name) {
|
|
for (var i = this.attributes.length; --i >= 0;) {
|
|
var attr = this.attributes[i];
|
|
if (attr.name === name) {
|
|
return attr.value;
|
|
}
|
|
}
|
|
return undefined;
|
|
},
|
|
|
|
setAttribute: function (name, value) {
|
|
for (var i = this.attributes.length; --i >= 0;) {
|
|
var attr = this.attributes[i];
|
|
if (attr.name === name) {
|
|
attr.setValue(value);
|
|
return;
|
|
}
|
|
}
|
|
this.attributes.push(new Attribute(name, value));
|
|
},
|
|
|
|
removeAttribute: function (name) {
|
|
for (var i = this.attributes.length; --i >= 0;) {
|
|
var attr = this.attributes[i];
|
|
if (attr.name === name) {
|
|
this.attributes.splice(i, 1);
|
|
break;
|
|
}
|
|
}
|
|
},
|
|
|
|
hasAttribute: function (name) {
|
|
return this.attributes.some(function (attr) {
|
|
return attr.name == name;
|
|
});
|
|
},
|
|
};
|
|
|
|
var 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) {
|
|
var attr = this.node.getAttribute("style");
|
|
if (!attr)
|
|
return undefined;
|
|
|
|
var styles = attr.split(";");
|
|
for (var i = 0; i < styles.length; i++) {
|
|
var style = styles[i].split(":");
|
|
var name = style[0].trim();
|
|
if (name === styleName)
|
|
return style[1].trim();
|
|
}
|
|
|
|
return undefined;
|
|
},
|
|
|
|
setStyle: function (styleName, styleValue) {
|
|
var value = this.node.getAttribute("style") || "";
|
|
var index = 0;
|
|
do {
|
|
var next = value.indexOf(";", index) + 1;
|
|
var length = next - index - 1;
|
|
var 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 (var 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]);
|
|
}
|
|
|
|
var JSDOMParser = function () {
|
|
this.currentChar = 0;
|
|
|
|
// In makeElementNode() we build up many strings one char at a time. Using
|
|
// += for this results in lots of short-lived intermediate strings. It's
|
|
// better to build an array of single-char strings and then join() them
|
|
// together at the end. And reusing a single array (i.e. |this.strBuf|)
|
|
// over and over for this purpose uses less memory than using a new array
|
|
// for each string.
|
|
this.strBuf = [];
|
|
|
|
// Similarly, we reuse this array to return the two arguments from
|
|
// makeElementNode(), which saves us from having to allocate a new array
|
|
// every time.
|
|
this.retPair = [];
|
|
|
|
this.errorState = "";
|
|
};
|
|
|
|
JSDOMParser.prototype = {
|
|
error: function(m) {
|
|
if (typeof dump !== "undefined") {
|
|
dump("JSDOMParser error: " + m + "\n");
|
|
} else if (typeof console !== "undefined") {
|
|
console.log("JSDOMParser error: " + m + "\n");
|
|
}
|
|
this.errorState += m + "\n";
|
|
},
|
|
|
|
/**
|
|
* 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) {
|
|
var str;
|
|
var 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) {
|
|
var name = "";
|
|
|
|
var 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
|
|
var c = this.nextChar();
|
|
if (c !== '"' && c !== "'") {
|
|
this.error("Error reading attribute " + name + ", expecting '\"'");
|
|
return;
|
|
}
|
|
|
|
// Read the attribute value (and consume the matching quote)
|
|
var value = this.readString(c);
|
|
|
|
node.attributes.push(new Attribute(name, decodeHTML(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 (retPair) {
|
|
var c = this.nextChar();
|
|
|
|
// Read the Element tag name
|
|
var strBuf = this.strBuf;
|
|
strBuf.length = 0;
|
|
while (whitespace.indexOf(c) == -1 && c !== ">" && c !== "/") {
|
|
if (c === undefined)
|
|
return false;
|
|
strBuf.push(c);
|
|
c = this.nextChar();
|
|
}
|
|
var tag = strBuf.join("");
|
|
|
|
if (!tag)
|
|
return false;
|
|
|
|
var node = new Element(tag);
|
|
|
|
// Read Element attributes
|
|
while (c !== "/" && c !== ">") {
|
|
if (c === undefined)
|
|
return false;
|
|
while (whitespace.indexOf(this.html[this.currentChar++]) != -1) {
|
|
// Advance cursor to first non-whitespace char.
|
|
}
|
|
this.currentChar--;
|
|
c = this.nextChar();
|
|
if (c !== "/" && c !== ">") {
|
|
--this.currentChar;
|
|
this.readAttribute(node);
|
|
}
|
|
}
|
|
|
|
// If this is a self-closing tag, read '/>'
|
|
var closed = false;
|
|
if (c === "/") {
|
|
closed = true;
|
|
c = this.nextChar();
|
|
if (c !== ">") {
|
|
this.error("expected '>' to close " + tag);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
retPair[0] = node;
|
|
retPair[1] = closed;
|
|
return true;
|
|
},
|
|
|
|
/**
|
|
* If the current input matches this string, advance the input index;
|
|
* otherwise, do nothing.
|
|
*
|
|
* @returns whether input matched string
|
|
*/
|
|
match: function (str) {
|
|
var strlen = str.length;
|
|
if (this.html.substr(this.currentChar, strlen).toLowerCase() === str.toLowerCase()) {
|
|
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) {
|
|
var 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) {
|
|
var child;
|
|
while ((child = this.readNode())) {
|
|
// Don't keep Comment nodes
|
|
if (child.nodeType !== 8) {
|
|
node.appendChild(child);
|
|
}
|
|
}
|
|
},
|
|
|
|
discardNextComment: function() {
|
|
if (this.match("--")) {
|
|
this.discardTo("-->");
|
|
} else {
|
|
var c = this.nextChar();
|
|
while (c !== ">") {
|
|
if (c === undefined)
|
|
return null;
|
|
if (c === '"' || c === "'")
|
|
this.readString(c);
|
|
c = this.nextChar();
|
|
}
|
|
}
|
|
return new Comment();
|
|
},
|
|
|
|
|
|
/**
|
|
* 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 () {
|
|
var c = this.nextChar();
|
|
|
|
if (c === undefined)
|
|
return null;
|
|
|
|
// Read any text as Text node
|
|
var textNode;
|
|
if (c !== "<") {
|
|
--this.currentChar;
|
|
textNode = new Text();
|
|
var n = this.html.indexOf("<", this.currentChar);
|
|
if (n === -1) {
|
|
textNode.innerHTML = this.html.substring(this.currentChar, this.html.length);
|
|
this.currentChar = this.html.length;
|
|
} else {
|
|
textNode.innerHTML = this.html.substring(this.currentChar, n);
|
|
this.currentChar = n;
|
|
}
|
|
return textNode;
|
|
}
|
|
|
|
if (this.match("![CDATA[")) {
|
|
var endChar = this.html.indexOf("]]>", this.currentChar);
|
|
if (endChar === -1) {
|
|
this.error("unclosed CDATA section");
|
|
return null;
|
|
}
|
|
textNode = new Text();
|
|
textNode.textContent = this.html.substring(this.currentChar, endChar);
|
|
this.currentChar = endChar + ("]]>").length;
|
|
return textNode;
|
|
}
|
|
|
|
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 === "?") {
|
|
// We're still before the ! or ? that is starting this comment:
|
|
this.currentChar++;
|
|
return this.discardNextComment();
|
|
}
|
|
|
|
// 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
|
|
var result = this.makeElementNode(this.retPair);
|
|
if (!result)
|
|
return null;
|
|
|
|
var node = this.retPair[0];
|
|
var closed = this.retPair[1];
|
|
var localName = node.localName;
|
|
|
|
// If this isn't a void Element, read its child nodes
|
|
if (!closed) {
|
|
this.readChildren(node);
|
|
var closingTag = "</" + node._matchingTag + ">";
|
|
if (!this.match(closingTag)) {
|
|
this.error("expected '" + closingTag + "' and got " + this.html.substr(this.currentChar, closingTag.length));
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// Only use the first title, because SVG might have other
|
|
// title elements which we don't care about (medium.com
|
|
// does this, at least).
|
|
if (localName === "title" && !this.doc.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, url) {
|
|
this.html = html;
|
|
var doc = this.doc = new Document(url);
|
|
this.readChildren(doc);
|
|
|
|
// If this is an HTML document, remove root-level children except for the
|
|
// <html> node
|
|
if (doc.documentElement) {
|
|
for (var i = doc.childNodes.length; --i >= 0;) {
|
|
var 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);
|
|
|
|
if (typeof module === "object") {
|
|
module.exports = this.JSDOMParser;
|
|
}
|