342 lines
15 KiB
JavaScript
342 lines
15 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- /
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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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Implementation of a service that converts certain vendor-prefixed CSS
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properties to their unprefixed equivalents, for sites on a whitelist. */
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"use strict";
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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function CSSUnprefixingService() {
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}
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CSSUnprefixingService.prototype = {
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// Boilerplate:
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classID: Components.ID("{f0729490-e15c-4a2f-a3fb-99e1cc946b42}"),
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_xpcom_factory: XPCOMUtils.generateSingletonFactory(CSSUnprefixingService),
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QueryInterface: XPCOMUtils.generateQI([Ci.nsICSSUnprefixingService]),
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// See documentation in nsICSSUnprefixingService.idl
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generateUnprefixedDeclaration: function(aPropName, aRightHalfOfDecl,
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aUnprefixedDecl /*out*/) {
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// Convert our input strings to lower-case, for easier string-matching.
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// (NOTE: If we ever need to add support for unprefixing properties that
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// have case-sensitive parts, then we should do these toLowerCase()
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// conversions in a more targeted way, to avoid breaking those properties.)
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aPropName = aPropName.toLowerCase();
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aRightHalfOfDecl = aRightHalfOfDecl.toLowerCase();
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// We have several groups of supported properties:
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// FIRST GROUP: Properties that can just be handled as aliases:
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// ============================================================
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const propertiesThatAreJustAliases = {
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"-webkit-background-size": "background-size",
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"-webkit-box-flex": "flex-grow",
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"-webkit-box-ordinal-group": "order",
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"-webkit-box-sizing": "box-sizing",
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"-webkit-transform": "transform",
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"-webkit-transform-origin": "transform-origin",
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};
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let unprefixedPropName = propertiesThatAreJustAliases[aPropName];
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if (unprefixedPropName !== undefined) {
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aUnprefixedDecl.value = unprefixedPropName + ":" + aRightHalfOfDecl;
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return true;
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}
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// SECOND GROUP: Properties that take a single keyword, where the
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// unprefixed version takes a different (but analogous) set of keywords:
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// =====================================================================
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const propertiesThatNeedKeywordMapping = {
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"-webkit-box-align" : {
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unprefixedPropName : "align-items",
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valueMap : {
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"start" : "flex-start",
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"center" : "center",
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"end" : "flex-end",
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"baseline" : "baseline",
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"stretch" : "stretch"
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}
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},
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"-webkit-box-orient" : {
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unprefixedPropName : "flex-direction",
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valueMap : {
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"horizontal" : "row",
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"inline-axis" : "row",
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"vertical" : "column",
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"block-axis" : "column"
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}
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},
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"-webkit-box-pack" : {
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unprefixedPropName : "justify-content",
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valueMap : {
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"start" : "flex-start",
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"center" : "center",
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"end" : "flex-end",
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"justify" : "space-between"
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}
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},
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};
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let propInfo = propertiesThatNeedKeywordMapping[aPropName];
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if (typeof(propInfo) != "undefined") {
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// Regexp for parsing the right half of a declaration, for keyword-valued
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// properties. Divides the right half of the declaration into:
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// 1) any leading whitespace
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// 2) the property value (one or more alphabetical character or hyphen)
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// 3) anything after that (e.g. "!important", ";")
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// Then we can look up the appropriate unprefixed-property value for the
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// value (part 2), and splice that together with the other parts and with
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// the unprefixed property-name to make the final declaration.
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const keywordValuedPropertyRegexp = /^(\s*)([a-z\-]+)(.*)/;
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let parts = keywordValuedPropertyRegexp.exec(aRightHalfOfDecl);
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if (!parts) {
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// Failed to parse a keyword out of aRightHalfOfDecl. (It probably has
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// no alphabetical characters.)
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return false;
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}
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let mappedKeyword = propInfo.valueMap[parts[2]];
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if (mappedKeyword === undefined) {
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// We found a keyword in aRightHalfOfDecl, but we don't have a mapping
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// to an equivalent keyword for the unprefixed version of the property.
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return false;
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}
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aUnprefixedDecl.value = propInfo.unprefixedPropName + ":" +
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parts[1] + // any leading whitespace
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mappedKeyword +
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parts[3]; // any trailing text (e.g. !important, semicolon, etc)
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return true;
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}
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// THIRD GROUP: Properties that may need arbitrary string-replacement:
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// ===================================================================
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const propertiesThatNeedStringReplacement = {
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// "-webkit-transition" takes a multi-part value. If "-webkit-transform"
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// appears as part of that value, replace it w/ "transform".
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// And regardless, we unprefix the "-webkit-transition" property-name.
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// (We could handle other prefixed properties in addition to 'transform'
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// here, but in practice "-webkit-transform" is the main one that's
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// likely to be transitioned & that we're concerned about supporting.)
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"-webkit-transition": {
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unprefixedPropName : "transition",
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stringMap : {
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"-webkit-transform" : "transform",
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}
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},
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};
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propInfo = propertiesThatNeedStringReplacement[aPropName];
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if (typeof(propInfo) != "undefined") {
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let newRightHalf = aRightHalfOfDecl;
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for (let strToReplace in propInfo.stringMap) {
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let replacement = propInfo.stringMap[strToReplace];
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newRightHalf = newRightHalf.split(strToReplace).join(replacement);
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}
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aUnprefixedDecl.value = propInfo.unprefixedPropName + ":" + newRightHalf;
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return true;
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}
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// No known mapping for property aPropName.
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return false;
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},
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// See documentation in nsICSSUnprefixingService.idl
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generateUnprefixedGradientValue: function(aPrefixedFuncName,
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aPrefixedFuncBody,
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aUnprefixedFuncName, /*[out]*/
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aUnprefixedFuncBody /*[out]*/) {
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var unprefixedFuncName, newValue;
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if (aPrefixedFuncName == "-webkit-gradient") {
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// Create expression for oldGradientParser:
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var parts = this.oldGradientParser(aPrefixedFuncBody);
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var type = parts[0].name;
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newValue = this.standardizeOldGradientArgs(type, parts.slice(1));
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unprefixedFuncName = type + "-gradient";
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}else{ // we're dealing with more modern syntax - should be somewhat easier, at least for linear gradients.
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// Fix three things: remove -webkit-, add 'to ' before reversed top/bottom keywords (linear) or 'at ' before position keywords (radial), recalculate deg-values
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// -webkit-linear-gradient( [ [ <angle> | [top | bottom] || [left | right] ],]? <color-stop>[, <color-stop>]+);
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if (aPrefixedFuncName != "-webkit-linear-gradient" &&
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aPrefixedFuncName != "-webkit-radial-gradient") {
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// Unrecognized prefixed gradient type
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return false;
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}
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unprefixedFuncName = aPrefixedFuncName.replace(/-webkit-/, '');
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// Keywords top, bottom, left, right: can be stand-alone or combined pairwise but in any order ('top left' or 'left top')
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// These give the starting edge or corner in the -webkit syntax. The standardised equivalent is 'to ' plus opposite values for linear gradients, 'at ' plus same values for radial gradients
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if(unprefixedFuncName.indexOf('linear') > -1){
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newValue = aPrefixedFuncBody.replace(/(top|bottom|left|right)+\s*(top|bottom|left|right)*/, function(str){
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var words = str.split(/\s+/);
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for(var i=0; i<words.length; i++){
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switch(words[i].toLowerCase()){
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case 'top':
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words[i] = 'bottom';
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break;
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case 'bottom':
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words[i] = 'top';
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break;
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case 'left':
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words[i] = 'right';
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break;
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case 'right':
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words[i] = 'left';
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}
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}
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str = words.join(' ');
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return ( 'to ' + str);
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});
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}else{
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newValue = aPrefixedFuncBody.replace(/(top|bottom|left|right)+\s/, 'at $1 ');
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}
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newValue = newValue.replace(/\d+deg/, function (val) {
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return (360 - (parseInt(val)-90))+'deg';
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});
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}
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aUnprefixedFuncName.value = unprefixedFuncName;
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aUnprefixedFuncBody.value = newValue;
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return true;
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},
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// Helpers for generateUnprefixedGradientValue():
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// ----------------------------------------------
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oldGradientParser : function(str){
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/** This method takes a legacy -webkit-gradient() method call and parses it
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to pull out the values, function names and their arguments.
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It returns something like [{name:'-webkit-gradient',args:[{name:'linear'}, {name:'top left'} ... ]}]
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*/
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var objs = [{}], path=[], current, word='', separator_chars = [',', '(', ')'];
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current = objs[0], path[0] = objs;
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//str = str.replace(/\s*\(/g, '('); // sorry, ws in front of ( would make parsing a lot harder
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for(var i = 0; i < str.length; i++){
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if(separator_chars.indexOf(str[i]) === -1){
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word += str[i];
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}else{ // now we have a "separator" - presumably we've also got a "word" or value
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current.name = word.trim();
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//GM_log(word+' '+path.length+' '+str[i])
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word = '';
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if(str[i] === '('){ // we assume the 'word' is a function, for example -webkit-gradient() or rgb(), so we create a place to record the arguments
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if(!('args' in current)){
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current.args = [];
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}
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current.args.push({});
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path.push(current.args);
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current = current.args[current.args.length - 1];
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path.push(current);
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}else if(str[i] === ')'){ // function is ended, no more arguments - go back to appending details to the previous branch of the tree
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current = path.pop(); // drop 'current'
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current = path.pop(); // drop 'args' reference
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}else{
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path.pop(); // remove 'current' object from path, we have no arguments to add
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var current_parent = path[path.length - 1] || objs; // last object on current path refers to array that contained the previous "current"
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current_parent.push({}); // we need a new object to hold this "word" or value
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current = current_parent[current_parent.length - 1]; // that object is now the 'current'
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path.push(current);
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//GM_log(path.length)
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}
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}
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}
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return objs;
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},
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/* Given an array of args for "-webkit-gradient(...)" returned by
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* oldGradientParser(), this function constructs a string representing the
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* equivalent arguments for a standard "linear-gradient(...)" or
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* "radial-gradient(...)" expression.
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*
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* @param type Either 'linear' or 'radial'.
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* @param args An array of args for a "-webkit-gradient(...)" expression,
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* provided by oldGradientParser() (not including gradient type).
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*/
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standardizeOldGradientArgs : function(type, args){
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var stdArgStr = "";
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var stops = [];
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if(/^linear/.test(type)){
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// linear gradient, args 1 and 2 tend to be start/end keywords
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var points = [].concat(args[0].name.split(/\s+/), args[1].name.split(/\s+/)); // example: [left, top, right, top]
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// Old webkit syntax "uses a two-point syntax that lets you explicitly state where a linear gradient starts and ends"
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// if start/end keywords are percentages, let's massage the values a little more..
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var rxPercTest = /\d+\%/;
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if(rxPercTest.test(points[0]) || points[0] == 0){
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var startX = parseInt(points[0]), startY = parseInt(points[1]), endX = parseInt(points[2]), endY = parseInt(points[3]);
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stdArgStr += ((Math.atan2(endY- startY, endX - startX)) * (180 / Math.PI)+90) + 'deg';
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}else{
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if(points[1] === points[3]){ // both 'top' or 'bottom, this linear gradient goes left-right
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stdArgStr += 'to ' + points[2];
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}else if(points[0] === points[2]){ // both 'left' or 'right', this linear gradient goes top-bottom
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stdArgStr += 'to ' + points[3];
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}else if(points[1] === 'top'){ // diagonal gradient - from top left to opposite corner is 135deg
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stdArgStr += '135deg';
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}else{
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stdArgStr += '45deg';
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}
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}
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}else if(/^radial/i.test(type)){ // oooh, radial gradients..
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stdArgStr += 'circle ' + args[3].name.replace(/(\d+)$/, '$1px') + ' at ' + args[0].name.replace(/(\d+) /, '$1px ').replace(/(\d+)$/, '$1px');
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}
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var toColor;
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for(var j = type === 'linear' ? 2 : 4; j < args.length; j++){
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var position, color, colorIndex;
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if(args[j].name === 'color-stop'){
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position = args[j].args[0].name;
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colorIndex = 1;
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}else if (args[j].name === 'to') {
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position = '100%';
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colorIndex = 0;
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}else if (args[j].name === 'from') {
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position = '0%';
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colorIndex = 0;
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};
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if (position.indexOf('%') === -1) { // original Safari syntax had 0.5 equivalent to 50%
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position = (parseFloat(position) * 100) +'%';
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};
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color = args[j].args[colorIndex].name;
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if (args[j].args[colorIndex].args) { // the color is itself a function call, like rgb()
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color += '(' + this.colorValue(args[j].args[colorIndex].args) + ')';
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};
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if (args[j].name === 'from'){
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stops.unshift(color + ' ' + position);
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}else if(args[j].name === 'to'){
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toColor = color;
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}else{
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stops.push(color + ' ' + position);
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}
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}
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// translating values to right syntax
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for(var j = 0; j < stops.length; j++){
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stdArgStr += ', ' + stops[j];
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}
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if(toColor){
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stdArgStr += ', ' + toColor + ' 100%';
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}
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return stdArgStr;
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},
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colorValue: function(obj){
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var ar = [];
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for (var i = 0; i < obj.length; i++) {
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ar.push(obj[i].name);
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};
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return ar.join(', ');
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},
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};
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this.NSGetFactory = XPCOMUtils.generateNSGetFactory([CSSUnprefixingService]);
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