mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-15 15:32:28 +02:00
Convert selector compiler closured code into standalone class
This ensures proper garbage collection once the parser is no longer referenced -- this is important now that the parser is instantiated on-demand only.
This commit is contained in:
Raymond Hill
parent
0ec4c911dd
commit
a211c2c95d
@ -105,6 +105,7 @@ const Parser = class {
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this.reIsLocalhostRedirect = /(?:0\.0\.0\.0|(?:broadcast|local)host|local|ip6-\w+)\b/;
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this.reHostname = /^[^\x00-\x24\x26-\x29\x2B\x2C\x2F\x3A-\x5E\x60\x7B-\x7F]+/;
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this.punycoder = new URL(self.location);
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this.selectorCompiler = new this.SelectorCompiler(this);
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// TODO: reuse for network filtering analysis
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this.result = {
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exception: false,
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@ -299,7 +300,7 @@ const Parser = class {
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this.flavorBits |= BITFlavorExtCosmetic;
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}
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this.result.raw = selector;
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if ( this.compileSelector(selector, this.result) === false ) {
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if ( this.selectorCompiler.compile(selector, this.result) === false ) {
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this.flavorBits |= BITFlavorUnsupported;
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}
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}
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@ -1071,78 +1072,23 @@ const Parser = class {
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// https://github.com/uBlockOrigin/uBlock-issues/issues/89
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// Do not discard unknown pseudo-elements.
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Parser.prototype.compileSelector = (( ) => {
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const reExtendedSyntax = /\[-(?:abp|ext)-[a-z-]+=(['"])(?:.+?)(?:\1)\]/;
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const reExtendedSyntaxParser = /\[-(?:abp|ext)-([a-z-]+)=(['"])(.+?)\2\]/;
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const reParseRegexLiteral = /^\/(.+)\/([imu]+)?$/;
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const translateAdguardCSSInjectionFilter = function(suffix) {
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const matches = /^([^{]+)\{([^}]+)\}\s*$/.exec(suffix);
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if ( matches === null ) { return ''; }
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const selector = matches[1].trim();
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const style = matches[2].trim();
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// Special style directive `remove: true` is converted into a
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// `:remove()` operator.
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if ( /^\s*remove:\s*true[; ]*$/.test(style) ) {
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return `${selector}:remove()`;
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}
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// For some reasons, many of Adguard's plain cosmetic filters are
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// "disguised" as style-based cosmetic filters: convert such filters
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// to plain cosmetic filters.
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return /display\s*:\s*none\s*!important;?$/.test(style)
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? selector
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: `${selector}:style(${style})`;
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};
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const normalizedExtendedSyntaxOperators = new Map([
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[ 'contains', ':has-text' ],
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[ 'has', ':has' ],
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[ 'matches-css', ':matches-css' ],
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[ 'matches-css-after', ':matches-css-after' ],
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[ 'matches-css-before', ':matches-css-before' ],
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]);
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// Return value:
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// 0b00 (0) = not a valid CSS selector
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// 0b01 (1) = valid CSS selector, without pseudo-element
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// 0b11 (3) = valid CSS selector, with pseudo element
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const cssSelectorType = (( ) => {
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// Quick regex-based validation -- most cosmetic filters are of the
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// simple form and in such case a regex is much faster.
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const reSimple = /^[#.][A-Za-z_][\w-]*$/;
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const div = document.createElement('div');
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// Keep in mind:
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// https://github.com/gorhill/uBlock/issues/693
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// https://github.com/gorhill/uBlock/issues/1955
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// https://github.com/gorhill/uBlock/issues/3111
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// Workaround until https://bugzilla.mozilla.org/show_bug.cgi?id=1406817
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// is fixed.
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return s => {
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if ( reSimple.test(s) ) { return 1; }
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const pos = cssPseudoSelector(s);
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if ( pos !== -1 ) {
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return cssSelectorType(s.slice(0, pos)) === 1 ? 3 : 0;
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}
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try {
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div.matches(`${s}, ${s}:not(#foo)`);
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} catch (ex) {
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return 0;
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}
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return 1;
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};
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})();
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const cssPseudoSelector = (( ) => {
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const rePseudo = /:(?::?after|:?before|:[a-z][a-z-]*[a-z])$/;
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return function(s) {
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if ( s.lastIndexOf(':') === -1 ) { return -1; }
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const match = rePseudo.exec(s);
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return match !== null ? match.index : -1;
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};
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})();
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const compileProceduralSelector = (( ) => {
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const reProceduralOperator = new RegExp([
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Parser.prototype.SelectorCompiler = class {
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constructor(parser) {
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this.parser = parser;
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this.reExtendedSyntax = /\[-(?:abp|ext)-[a-z-]+=(['"])(?:.+?)(?:\1)\]/;
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this.reExtendedSyntaxParser = /\[-(?:abp|ext)-([a-z-]+)=(['"])(.+?)\2\]/;
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this.reParseRegexLiteral = /^\/(.+)\/([imu]+)?$/;
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this.normalizedExtendedSyntaxOperators = new Map([
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[ 'contains', ':has-text' ],
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[ 'has', ':has' ],
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[ 'matches-css', ':matches-css' ],
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[ 'matches-css-after', ':matches-css-after' ],
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[ 'matches-css-before', ':matches-css-before' ],
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]);
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this.reSimpleSelector = /^[#.][A-Za-z_][\w-]*$/;
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this.div = document.createElement('div');
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this.rePseudoClass = /:(?::?after|:?before|:[a-z][a-z-]*[a-z])$/;
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this.reProceduralOperator = new RegExp([
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'^(?:',
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[
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'-abp-contains',
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@ -1167,394 +1113,27 @@ Parser.prototype.compileSelector = (( ) => {
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].join('|'),
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')\\('
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].join(''));
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const reEatBackslashes = /\\([()])/g;
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const reEscapeRegex = /[.*+?^${}()|[\]\\]/g;
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const reNeedScope = /^\s*>/;
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const reIsDanglingSelector = /[+>~\s]\s*$/;
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const reIsSiblingSelector = /^\s*[+~]/;
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const regexToRawValue = new Map();
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const isBadRegex = function(s) {
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try {
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void new RegExp(s);
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} catch (ex) {
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isBadRegex.message = ex.toString();
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return true;
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}
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return false;
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};
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// When dealing with literal text, we must first eat _some_
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// backslash characters.
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const compileText = function(s) {
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const match = reParseRegexLiteral.exec(s);
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let regexDetails;
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if ( match !== null ) {
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regexDetails = match[1];
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if ( isBadRegex(regexDetails) ) { return; }
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if ( match[2] ) {
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regexDetails = [ regexDetails, match[2] ];
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}
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} else {
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regexDetails = s.replace(reEatBackslashes, '$1')
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.replace(reEscapeRegex, '\\$&');
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regexToRawValue.set(regexDetails, s);
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}
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return regexDetails;
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};
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const compileCSSDeclaration = function(s) {
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const pos = s.indexOf(':');
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if ( pos === -1 ) { return; }
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const name = s.slice(0, pos).trim();
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const value = s.slice(pos + 1).trim();
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const match = reParseRegexLiteral.exec(value);
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let regexDetails;
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if ( match !== null ) {
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regexDetails = match[1];
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if ( isBadRegex(regexDetails) ) { return; }
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if ( match[2] ) {
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regexDetails = [ regexDetails, match[2] ];
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}
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} else {
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regexDetails = '^' + value.replace(reEscapeRegex, '\\$&') + '$';
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regexToRawValue.set(regexDetails, value);
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}
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return { name: name, value: regexDetails };
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};
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const compileConditionalSelector = function(s) {
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// https://github.com/AdguardTeam/ExtendedCss/issues/31#issuecomment-302391277
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// Prepend `:scope ` if needed.
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if ( reNeedScope.test(s) ) {
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s = `:scope ${s}`;
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}
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return compile(s);
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};
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const compileInteger = function(s, min = 0, max = 0x7FFFFFFF) {
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if ( /^\d+$/.test(s) === false ) { return; }
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const n = parseInt(s, 10);
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if ( n < min || n >= max ) { return; }
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return n;
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};
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const compileNotSelector = function(s) {
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// https://github.com/uBlockOrigin/uBlock-issues/issues/341#issuecomment-447603588
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// Reject instances of :not() filters for which the argument is
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// a valid CSS selector, otherwise we would be adversely
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// changing the behavior of CSS4's :not().
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if ( cssSelectorType(s) === 0 ) {
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return compileConditionalSelector(s);
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}
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};
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const compileUpwardArgument = function(s) {
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const i = compileInteger(s, 1, 256);
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if ( i !== undefined ) { return i; }
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if ( cssSelectorType(s) === 1 ) { return s; }
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};
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const compileRemoveSelector = function(s) {
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if ( s === '' ) { return s; }
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};
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const compileSpathExpression = function(s) {
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if ( cssSelectorType('*' + s) === 1 ) {
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return s;
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}
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};
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const compileStyleProperties = (( ) => {
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let div;
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// https://github.com/uBlockOrigin/uBlock-issues/issues/668
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return function(s) {
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if ( /url\(|\\/i.test(s) ) { return; }
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if ( div === undefined ) {
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div = document.createElement('div');
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}
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div.style.cssText = s;
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if ( div.style.cssText === '' ) { return; }
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div.style.cssText = '';
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return s;
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};
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})();
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const compileAttrList = function(s) {
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const attrs = s.split('\s*,\s*');
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const out = [];
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for ( const attr of attrs ) {
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if ( attr !== '' ) {
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out.push(attr);
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}
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}
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return out;
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};
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const compileXpathExpression = function(s) {
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try {
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document.createExpression(s, null);
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} catch (e) {
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return;
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}
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return s;
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};
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this.reEatBackslashes = /\\([()])/g;
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this.reEscapeRegex = /[.*+?^${}()|[\]\\]/g;
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this.reNeedScope = /^\s*>/;
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this.reIsDanglingSelector = /[+>~\s]\s*$/;
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this.reIsSiblingSelector = /^\s*[+~]/;
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this.regexToRawValue = new Map();
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// https://github.com/gorhill/uBlock/issues/2793
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const normalizedOperators = new Map([
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this.normalizedOperators = new Map([
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[ ':-abp-contains', ':has-text' ],
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[ ':-abp-has', ':has' ],
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[ ':contains', ':has-text' ],
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[ ':nth-ancestor', ':upward' ],
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[ ':watch-attrs', ':watch-attr' ],
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]);
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const compileArgument = new Map([
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[ ':has', compileConditionalSelector ],
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[ ':has-text', compileText ],
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[ ':if', compileConditionalSelector ],
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[ ':if-not', compileConditionalSelector ],
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[ ':matches-css', compileCSSDeclaration ],
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[ ':matches-css-after', compileCSSDeclaration ],
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[ ':matches-css-before', compileCSSDeclaration ],
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[ ':min-text-length', compileInteger ],
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[ ':not', compileNotSelector ],
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[ ':remove', compileRemoveSelector ],
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[ ':spath', compileSpathExpression ],
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[ ':style', compileStyleProperties ],
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[ ':upward', compileUpwardArgument ],
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[ ':watch-attr', compileAttrList ],
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[ ':xpath', compileXpathExpression ],
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]);
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const actionOperators = new Set([
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this.actionOperators = new Set([
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':remove',
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':style',
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]);
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}
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// https://github.com/gorhill/uBlock/issues/2793#issuecomment-333269387
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// Normalize (somewhat) the stringified version of procedural
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// cosmetic filters -- this increase the likelihood of detecting
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// duplicates given that uBO is able to understand syntax specific
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// to other blockers.
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// The normalized string version is what is reported in the logger,
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// by design.
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const decompile = function(compiled) {
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const tasks = compiled.tasks;
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if ( Array.isArray(tasks) === false ) {
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return compiled.selector;
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}
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const raw = [ compiled.selector ];
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let value;
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for ( const task of tasks ) {
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switch ( task[0] ) {
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case ':has':
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case ':if':
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raw.push(`:has(${decompile(task[1])})`);
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break;
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case ':has-text':
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if ( Array.isArray(task[1]) ) {
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value = `/${task[1][0]}/${task[1][1]}`;
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} else {
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value = regexToRawValue.get(task[1]);
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if ( value === undefined ) {
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value = `/${task[1]}/`;
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}
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}
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raw.push(`:has-text(${value})`);
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break;
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case ':matches-css':
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case ':matches-css-after':
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case ':matches-css-before':
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if ( Array.isArray(task[1].value) ) {
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value = `/${task[1].value[0]}/${task[1].value[1]}`;
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} else {
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value = regexToRawValue.get(task[1].value);
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if ( value === undefined ) {
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value = `/${task[1].value}/`;
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}
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}
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raw.push(`${task[0]}(${task[1].name}: ${value})`);
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break;
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case ':not':
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case ':if-not':
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raw.push(`:not(${decompile(task[1])})`);
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break;
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case ':spath':
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raw.push(task[1]);
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break;
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case ':min-text-length':
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case ':remove':
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case ':style':
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case ':upward':
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case ':watch-attr':
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case ':xpath':
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raw.push(`${task[0]}(${task[1]})`);
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break;
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}
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}
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return raw.join('');
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};
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const compile = function(raw, root = false) {
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if ( raw === '' ) { return; }
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const tasks = [];
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const n = raw.length;
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let prefix = '';
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let i = 0;
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let opPrefixBeg = 0;
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let action;
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// TODO: use slices instead of charCodeAt()
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for (;;) {
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let c, match;
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// Advance to next operator.
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while ( i < n ) {
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c = raw.charCodeAt(i++);
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if ( c === 0x3A /* ':' */ ) {
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match = reProceduralOperator.exec(raw.slice(i));
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if ( match !== null ) { break; }
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}
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}
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if ( i === n ) { break; }
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const opNameBeg = i - 1;
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const opNameEnd = i + match[0].length - 1;
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i += match[0].length;
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// Find end of argument: first balanced closing parenthesis.
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// Note: unbalanced parenthesis can be used in a regex literal
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// when they are escaped using `\`.
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// TODO: need to handle quoted parentheses.
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let pcnt = 1;
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while ( i < n ) {
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c = raw.charCodeAt(i++);
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if ( c === 0x5C /* '\\' */ ) {
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if ( i < n ) { i += 1; }
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} else if ( c === 0x28 /* '(' */ ) {
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pcnt +=1 ;
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} else if ( c === 0x29 /* ')' */ ) {
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pcnt -= 1;
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if ( pcnt === 0 ) { break; }
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}
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}
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// Unbalanced parenthesis? An unbalanced parenthesis is fine
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// as long as the last character is a closing parenthesis.
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if ( pcnt !== 0 && c !== 0x29 ) { return; }
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// https://github.com/uBlockOrigin/uBlock-issues/issues/341#issuecomment-447603588
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// Maybe that one operator is a valid CSS selector and if so,
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// then consider it to be part of the prefix.
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if ( cssSelectorType(raw.slice(opNameBeg, i)) === 1 ) {
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continue;
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}
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// Extract and remember operator details.
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let operator = raw.slice(opNameBeg, opNameEnd);
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operator = normalizedOperators.get(operator) || operator;
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// Action operator can only be used as trailing operator in the
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// root task list.
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// Per-operator arguments validation
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const args = compileArgument.get(operator)(
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raw.slice(opNameEnd + 1, i - 1)
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);
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if ( args === undefined ) { return; }
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if ( opPrefixBeg === 0 ) {
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prefix = raw.slice(0, opNameBeg);
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} else if ( opNameBeg !== opPrefixBeg ) {
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if ( action !== undefined ) { return; }
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const spath = compileSpathExpression(
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raw.slice(opPrefixBeg, opNameBeg)
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);
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if ( spath === undefined ) { return; }
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tasks.push([ ':spath', spath ]);
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}
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if ( action !== undefined ) { return; }
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tasks.push([ operator, args ]);
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if ( actionOperators.has(operator) ) {
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if ( root === false ) { return; }
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action = operator.slice(1);
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}
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opPrefixBeg = i;
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if ( i === n ) { break; }
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}
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// No task found: then we have a CSS selector.
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// At least one task found: nothing should be left to parse.
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if ( tasks.length === 0 ) {
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prefix = raw;
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} else if ( opPrefixBeg < n ) {
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if ( action !== undefined ) { return; }
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const spath = compileSpathExpression(raw.slice(opPrefixBeg));
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if ( spath === undefined ) { return; }
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tasks.push([ ':spath', spath ]);
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}
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// https://github.com/NanoAdblocker/NanoCore/issues/1#issuecomment-354394894
|
||||
// https://www.reddit.com/r/uBlockOrigin/comments/c6iem5/
|
||||
// Convert sibling-selector prefix into :spath operator, but
|
||||
// only if context is not the root.
|
||||
if ( prefix !== '' ) {
|
||||
if ( reIsDanglingSelector.test(prefix) && tasks.length !== 0 ) {
|
||||
prefix += ' *';
|
||||
}
|
||||
if ( cssSelectorType(prefix) === 0 ) {
|
||||
if (
|
||||
root ||
|
||||
reIsSiblingSelector.test(prefix) === false ||
|
||||
compileSpathExpression(prefix) === undefined
|
||||
) {
|
||||
return;
|
||||
}
|
||||
tasks.unshift([ ':spath', prefix ]);
|
||||
prefix = '';
|
||||
}
|
||||
}
|
||||
|
||||
const out = { selector: prefix };
|
||||
|
||||
if ( tasks.length !== 0 ) {
|
||||
out.tasks = tasks;
|
||||
}
|
||||
|
||||
// Expose action to take in root descriptor.
|
||||
//
|
||||
// https://github.com/uBlockOrigin/uBlock-issues/issues/961
|
||||
// https://github.com/uBlockOrigin/uBlock-issues/issues/382
|
||||
// For the time being, `style` action can't be used in a
|
||||
// procedural selector.
|
||||
if ( action !== undefined ) {
|
||||
if ( tasks.length > 1 && action === 'style' ) { return; }
|
||||
out.action = action;
|
||||
}
|
||||
|
||||
// Pseudo-selectors are valid only when used in a root task list.
|
||||
if ( prefix !== '' ) {
|
||||
const pos = cssPseudoSelector(prefix);
|
||||
if ( pos !== -1 ) {
|
||||
if ( root === false ) { return; }
|
||||
out.pseudo = pos;
|
||||
}
|
||||
}
|
||||
|
||||
return out;
|
||||
};
|
||||
|
||||
const entryPoint = function(raw) {
|
||||
const compiled = compile(raw, true);
|
||||
if ( compiled !== undefined ) {
|
||||
compiled.raw = decompile(compiled);
|
||||
}
|
||||
return compiled;
|
||||
};
|
||||
|
||||
entryPoint.reset = function() {
|
||||
regexToRawValue.clear();
|
||||
};
|
||||
|
||||
return entryPoint;
|
||||
})();
|
||||
|
||||
const entryPoint = function(raw, out) {
|
||||
compile(raw, out) {
|
||||
// https://github.com/gorhill/uBlock/issues/952
|
||||
// Find out whether we are dealing with an Adguard-specific cosmetic
|
||||
// filter, and if so, translate it if supported, or discard it if not
|
||||
@ -1563,16 +1142,16 @@ Parser.prototype.compileSelector = (( ) => {
|
||||
// character is `$`, `%` or `?`, otherwise it's not a cosmetic
|
||||
// filter.
|
||||
// Adguard's style injection: translate to uBO's format.
|
||||
if ( hasBits(this.flavorBits, BITFlavorExtStyle) ) {
|
||||
raw = translateAdguardCSSInjectionFilter(raw);
|
||||
if ( hasBits(this.parser.flavorBits, BITFlavorExtStyle) ) {
|
||||
raw = this.translateAdguardCSSInjectionFilter(raw);
|
||||
if ( raw === '' ) { return false; }
|
||||
out.raw = raw;
|
||||
}
|
||||
|
||||
let extendedSyntax = false;
|
||||
const selectorType = cssSelectorType(raw);
|
||||
const selectorType = this.cssSelectorType(raw);
|
||||
if ( selectorType !== 0 ) {
|
||||
extendedSyntax = reExtendedSyntax.test(raw);
|
||||
extendedSyntax = this.reExtendedSyntax.test(raw);
|
||||
if ( extendedSyntax === false ) {
|
||||
out.pseudoclass = selectorType === 3;
|
||||
out.compiled = raw;
|
||||
@ -1592,18 +1171,18 @@ Parser.prototype.compileSelector = (( ) => {
|
||||
// See https://issues.adblockplus.org/ticket/5287
|
||||
if ( extendedSyntax ) {
|
||||
let matches;
|
||||
while ( (matches = reExtendedSyntaxParser.exec(raw)) !== null ) {
|
||||
const operator = normalizedExtendedSyntaxOperators.get(matches[1]);
|
||||
while ( (matches = this.reExtendedSyntaxParser.exec(raw)) !== null ) {
|
||||
const operator = this.normalizedExtendedSyntaxOperators.get(matches[1]);
|
||||
if ( operator === undefined ) { return false; }
|
||||
raw = raw.slice(0, matches.index) +
|
||||
operator + '(' + matches[3] + ')' +
|
||||
raw.slice(matches.index + matches[0].length);
|
||||
}
|
||||
return entryPoint.call(this, raw, out);
|
||||
return this.compile(raw, out);
|
||||
}
|
||||
|
||||
// Procedural selector?
|
||||
const compiled = compileProceduralSelector(raw);
|
||||
const compiled = this.compileProceduralSelector(raw);
|
||||
if ( compiled === undefined ) { return false; }
|
||||
|
||||
if ( compiled.pseudo !== undefined ) {
|
||||
@ -1612,10 +1191,430 @@ Parser.prototype.compileSelector = (( ) => {
|
||||
|
||||
out.compiled = JSON.stringify(compiled);
|
||||
return true;
|
||||
};
|
||||
}
|
||||
|
||||
return entryPoint;
|
||||
})();
|
||||
translateAdguardCSSInjectionFilter(suffix) {
|
||||
const matches = /^([^{]+)\{([^}]+)\}\s*$/.exec(suffix);
|
||||
if ( matches === null ) { return ''; }
|
||||
const selector = matches[1].trim();
|
||||
const style = matches[2].trim();
|
||||
// Special style directive `remove: true` is converted into a
|
||||
// `:remove()` operator.
|
||||
if ( /^\s*remove:\s*true[; ]*$/.test(style) ) {
|
||||
return `${selector}:remove()`;
|
||||
}
|
||||
// For some reasons, many of Adguard's plain cosmetic filters are
|
||||
// "disguised" as style-based cosmetic filters: convert such filters
|
||||
// to plain cosmetic filters.
|
||||
return /display\s*:\s*none\s*!important;?$/.test(style)
|
||||
? selector
|
||||
: `${selector}:style(${style})`;
|
||||
}
|
||||
|
||||
// Return value:
|
||||
// 0b00 (0) = not a valid CSS selector
|
||||
// 0b01 (1) = valid CSS selector, without pseudo-element
|
||||
// 0b11 (3) = valid CSS selector, with pseudo element
|
||||
//
|
||||
// Quick regex-based validation -- most cosmetic filters are of the
|
||||
// simple form and in such case a regex is much faster.
|
||||
// Keep in mind:
|
||||
// https://github.com/gorhill/uBlock/issues/693
|
||||
// https://github.com/gorhill/uBlock/issues/1955
|
||||
// https://github.com/gorhill/uBlock/issues/3111
|
||||
// Workaround until https://bugzilla.mozilla.org/show_bug.cgi?id=1406817
|
||||
// is fixed.
|
||||
cssSelectorType(s) {
|
||||
if ( this.reSimpleSelector.test(s) ) { return 1; }
|
||||
const pos = this.cssPseudoSelector(s);
|
||||
if ( pos !== -1 ) {
|
||||
return this.cssSelectorType(s.slice(0, pos)) === 1 ? 3 : 0;
|
||||
}
|
||||
try {
|
||||
this.div.matches(`${s}, ${s}:not(#foo)`);
|
||||
} catch (ex) {
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
|
||||
cssPseudoSelector(s) {
|
||||
if ( s.lastIndexOf(':') === -1 ) { return -1; }
|
||||
const match = this.rePseudoClass.exec(s);
|
||||
return match !== null ? match.index : -1;
|
||||
}
|
||||
|
||||
compileProceduralSelector(raw) {
|
||||
const compiled = this.compileProcedural(raw, true);
|
||||
if ( compiled !== undefined ) {
|
||||
compiled.raw = this.decompileProcedural(compiled);
|
||||
}
|
||||
return compiled;
|
||||
}
|
||||
|
||||
isBadRegex(s) {
|
||||
try {
|
||||
void new RegExp(s);
|
||||
} catch (ex) {
|
||||
this.isBadRegex.message = ex.toString();
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
// When dealing with literal text, we must first eat _some_
|
||||
// backslash characters.
|
||||
compileText(s) {
|
||||
const match = this.reParseRegexLiteral.exec(s);
|
||||
let regexDetails;
|
||||
if ( match !== null ) {
|
||||
regexDetails = match[1];
|
||||
if ( this.isBadRegex(regexDetails) ) { return; }
|
||||
if ( match[2] ) {
|
||||
regexDetails = [ regexDetails, match[2] ];
|
||||
}
|
||||
} else {
|
||||
regexDetails = s.replace(this.reEatBackslashes, '$1')
|
||||
.replace(this.reEscapeRegex, '\\$&');
|
||||
this.regexToRawValue.set(regexDetails, s);
|
||||
}
|
||||
return regexDetails;
|
||||
}
|
||||
|
||||
compileCSSDeclaration(s) {
|
||||
const pos = s.indexOf(':');
|
||||
if ( pos === -1 ) { return; }
|
||||
const name = s.slice(0, pos).trim();
|
||||
const value = s.slice(pos + 1).trim();
|
||||
const match = this.reParseRegexLiteral.exec(value);
|
||||
let regexDetails;
|
||||
if ( match !== null ) {
|
||||
regexDetails = match[1];
|
||||
if ( this.isBadRegex(regexDetails) ) { return; }
|
||||
if ( match[2] ) {
|
||||
regexDetails = [ regexDetails, match[2] ];
|
||||
}
|
||||
} else {
|
||||
regexDetails = '^' + value.replace(this.reEscapeRegex, '\\$&') + '$';
|
||||
this.regexToRawValue.set(regexDetails, value);
|
||||
}
|
||||
return { name: name, value: regexDetails };
|
||||
}
|
||||
|
||||
compileConditionalSelector(s) {
|
||||
// https://github.com/AdguardTeam/ExtendedCss/issues/31#issuecomment-302391277
|
||||
// Prepend `:scope ` if needed.
|
||||
if ( this.reNeedScope.test(s) ) {
|
||||
s = `:scope ${s}`;
|
||||
}
|
||||
return this.compileProcedural(s);
|
||||
}
|
||||
|
||||
compileInteger(s, min = 0, max = 0x7FFFFFFF) {
|
||||
if ( /^\d+$/.test(s) === false ) { return; }
|
||||
const n = parseInt(s, 10);
|
||||
if ( n < min || n >= max ) { return; }
|
||||
return n;
|
||||
}
|
||||
|
||||
compileNotSelector(s) {
|
||||
// https://github.com/uBlockOrigin/uBlock-issues/issues/341#issuecomment-447603588
|
||||
// Reject instances of :not() filters for which the argument is
|
||||
// a valid CSS selector, otherwise we would be adversely
|
||||
// changing the behavior of CSS4's :not().
|
||||
if ( this.cssSelectorType(s) === 0 ) {
|
||||
return this.compileConditionalSelector(s);
|
||||
}
|
||||
}
|
||||
|
||||
compileUpwardArgument(s) {
|
||||
const i = this.compileInteger(s, 1, 256);
|
||||
if ( i !== undefined ) { return i; }
|
||||
if ( this.cssSelectorType(s) === 1 ) { return s; }
|
||||
}
|
||||
|
||||
compileRemoveSelector(s) {
|
||||
if ( s === '' ) { return s; }
|
||||
}
|
||||
|
||||
compileSpathExpression(s) {
|
||||
if ( this.cssSelectorType('*' + s) === 1 ) {
|
||||
return s;
|
||||
}
|
||||
}
|
||||
|
||||
// https://github.com/uBlockOrigin/uBlock-issues/issues/668
|
||||
compileStyleProperties(s) {
|
||||
if ( /url\(|\\/i.test(s) ) { return; }
|
||||
this.div.style.cssText = s;
|
||||
if ( this.div.style.cssText === '' ) { return; }
|
||||
this.div.style.cssText = '';
|
||||
return s;
|
||||
}
|
||||
|
||||
compileAttrList(s) {
|
||||
const attrs = s.split('\s*,\s*');
|
||||
const out = [];
|
||||
for ( const attr of attrs ) {
|
||||
if ( attr !== '' ) {
|
||||
out.push(attr);
|
||||
}
|
||||
}
|
||||
return out;
|
||||
}
|
||||
|
||||
compileXpathExpression(s) {
|
||||
try {
|
||||
document.createExpression(s, null);
|
||||
} catch (e) {
|
||||
return;
|
||||
}
|
||||
return s;
|
||||
}
|
||||
|
||||
// https://github.com/gorhill/uBlock/issues/2793#issuecomment-333269387
|
||||
// Normalize (somewhat) the stringified version of procedural
|
||||
// cosmetic filters -- this increase the likelihood of detecting
|
||||
// duplicates given that uBO is able to understand syntax specific
|
||||
// to other blockers.
|
||||
// The normalized string version is what is reported in the logger,
|
||||
// by design.
|
||||
decompileProcedural(compiled) {
|
||||
const tasks = compiled.tasks;
|
||||
if ( Array.isArray(tasks) === false ) {
|
||||
return compiled.selector;
|
||||
}
|
||||
const raw = [ compiled.selector ];
|
||||
let value;
|
||||
for ( const task of tasks ) {
|
||||
switch ( task[0] ) {
|
||||
case ':has':
|
||||
case ':if':
|
||||
raw.push(`:has(${this.decompileProcedural(task[1])})`);
|
||||
break;
|
||||
case ':has-text':
|
||||
if ( Array.isArray(task[1]) ) {
|
||||
value = `/${task[1][0]}/${task[1][1]}`;
|
||||
} else {
|
||||
value = this.regexToRawValue.get(task[1]);
|
||||
if ( value === undefined ) {
|
||||
value = `/${task[1]}/`;
|
||||
}
|
||||
}
|
||||
raw.push(`:has-text(${value})`);
|
||||
break;
|
||||
case ':matches-css':
|
||||
case ':matches-css-after':
|
||||
case ':matches-css-before':
|
||||
if ( Array.isArray(task[1].value) ) {
|
||||
value = `/${task[1].value[0]}/${task[1].value[1]}`;
|
||||
} else {
|
||||
value = this.regexToRawValue.get(task[1].value);
|
||||
if ( value === undefined ) {
|
||||
value = `/${task[1].value}/`;
|
||||
}
|
||||
}
|
||||
raw.push(`${task[0]}(${task[1].name}: ${value})`);
|
||||
break;
|
||||
case ':not':
|
||||
case ':if-not':
|
||||
raw.push(`:not(${this.decompileProcedural(task[1])})`);
|
||||
break;
|
||||
case ':spath':
|
||||
raw.push(task[1]);
|
||||
break;
|
||||
case ':min-text-length':
|
||||
case ':remove':
|
||||
case ':style':
|
||||
case ':upward':
|
||||
case ':watch-attr':
|
||||
case ':xpath':
|
||||
raw.push(`${task[0]}(${task[1]})`);
|
||||
break;
|
||||
}
|
||||
}
|
||||
return raw.join('');
|
||||
}
|
||||
|
||||
compileProcedural(raw, root = false) {
|
||||
if ( raw === '' ) { return; }
|
||||
|
||||
const tasks = [];
|
||||
const n = raw.length;
|
||||
let prefix = '';
|
||||
let i = 0;
|
||||
let opPrefixBeg = 0;
|
||||
let action;
|
||||
|
||||
// TODO: use slices instead of charCodeAt()
|
||||
for (;;) {
|
||||
let c, match;
|
||||
// Advance to next operator.
|
||||
while ( i < n ) {
|
||||
c = raw.charCodeAt(i++);
|
||||
if ( c === 0x3A /* ':' */ ) {
|
||||
match = this.reProceduralOperator.exec(raw.slice(i));
|
||||
if ( match !== null ) { break; }
|
||||
}
|
||||
}
|
||||
if ( i === n ) { break; }
|
||||
const opNameBeg = i - 1;
|
||||
const opNameEnd = i + match[0].length - 1;
|
||||
i += match[0].length;
|
||||
// Find end of argument: first balanced closing parenthesis.
|
||||
// Note: unbalanced parenthesis can be used in a regex literal
|
||||
// when they are escaped using `\`.
|
||||
// TODO: need to handle quoted parentheses.
|
||||
let pcnt = 1;
|
||||
while ( i < n ) {
|
||||
c = raw.charCodeAt(i++);
|
||||
if ( c === 0x5C /* '\\' */ ) {
|
||||
if ( i < n ) { i += 1; }
|
||||
} else if ( c === 0x28 /* '(' */ ) {
|
||||
pcnt +=1 ;
|
||||
} else if ( c === 0x29 /* ')' */ ) {
|
||||
pcnt -= 1;
|
||||
if ( pcnt === 0 ) { break; }
|
||||
}
|
||||
}
|
||||
// Unbalanced parenthesis? An unbalanced parenthesis is fine
|
||||
// as long as the last character is a closing parenthesis.
|
||||
if ( pcnt !== 0 && c !== 0x29 ) { return; }
|
||||
// https://github.com/uBlockOrigin/uBlock-issues/issues/341#issuecomment-447603588
|
||||
// Maybe that one operator is a valid CSS selector and if so,
|
||||
// then consider it to be part of the prefix.
|
||||
if ( this.cssSelectorType(raw.slice(opNameBeg, i)) === 1 ) {
|
||||
continue;
|
||||
}
|
||||
// Extract and remember operator details.
|
||||
let operator = raw.slice(opNameBeg, opNameEnd);
|
||||
operator = this.normalizedOperators.get(operator) || operator;
|
||||
// Action operator can only be used as trailing operator in the
|
||||
// root task list.
|
||||
// Per-operator arguments validation
|
||||
const args = this.compileArgument(
|
||||
operator,
|
||||
raw.slice(opNameEnd + 1, i - 1)
|
||||
);
|
||||
if ( args === undefined ) { return; }
|
||||
if ( opPrefixBeg === 0 ) {
|
||||
prefix = raw.slice(0, opNameBeg);
|
||||
} else if ( opNameBeg !== opPrefixBeg ) {
|
||||
if ( action !== undefined ) { return; }
|
||||
const spath = this.compileSpathExpression(
|
||||
raw.slice(opPrefixBeg, opNameBeg)
|
||||
);
|
||||
if ( spath === undefined ) { return; }
|
||||
tasks.push([ ':spath', spath ]);
|
||||
}
|
||||
if ( action !== undefined ) { return; }
|
||||
tasks.push([ operator, args ]);
|
||||
if ( this.actionOperators.has(operator) ) {
|
||||
if ( root === false ) { return; }
|
||||
action = operator.slice(1);
|
||||
}
|
||||
opPrefixBeg = i;
|
||||
if ( i === n ) { break; }
|
||||
}
|
||||
|
||||
// No task found: then we have a CSS selector.
|
||||
// At least one task found: nothing should be left to parse.
|
||||
if ( tasks.length === 0 ) {
|
||||
prefix = raw;
|
||||
} else if ( opPrefixBeg < n ) {
|
||||
if ( action !== undefined ) { return; }
|
||||
const spath = this.compileSpathExpression(raw.slice(opPrefixBeg));
|
||||
if ( spath === undefined ) { return; }
|
||||
tasks.push([ ':spath', spath ]);
|
||||
}
|
||||
|
||||
// https://github.com/NanoAdblocker/NanoCore/issues/1#issuecomment-354394894
|
||||
// https://www.reddit.com/r/uBlockOrigin/comments/c6iem5/
|
||||
// Convert sibling-selector prefix into :spath operator, but
|
||||
// only if context is not the root.
|
||||
if ( prefix !== '' ) {
|
||||
if ( this.reIsDanglingSelector.test(prefix) && tasks.length !== 0 ) {
|
||||
prefix += ' *';
|
||||
}
|
||||
if ( this.cssSelectorType(prefix) === 0 ) {
|
||||
if (
|
||||
root ||
|
||||
this.reIsSiblingSelector.test(prefix) === false ||
|
||||
this.compileSpathExpression(prefix) === undefined
|
||||
) {
|
||||
return;
|
||||
}
|
||||
tasks.unshift([ ':spath', prefix ]);
|
||||
prefix = '';
|
||||
}
|
||||
}
|
||||
|
||||
const out = { selector: prefix };
|
||||
|
||||
if ( tasks.length !== 0 ) {
|
||||
out.tasks = tasks;
|
||||
}
|
||||
|
||||
// Expose action to take in root descriptor.
|
||||
//
|
||||
// https://github.com/uBlockOrigin/uBlock-issues/issues/961
|
||||
// https://github.com/uBlockOrigin/uBlock-issues/issues/382
|
||||
// For the time being, `style` action can't be used in a
|
||||
// procedural selector.
|
||||
if ( action !== undefined ) {
|
||||
if ( tasks.length > 1 && action === 'style' ) { return; }
|
||||
out.action = action;
|
||||
}
|
||||
|
||||
// Pseudo-selectors are valid only when used in a root task list.
|
||||
if ( prefix !== '' ) {
|
||||
const pos = this.cssPseudoSelector(prefix);
|
||||
if ( pos !== -1 ) {
|
||||
if ( root === false ) { return; }
|
||||
out.pseudo = pos;
|
||||
}
|
||||
}
|
||||
|
||||
return out;
|
||||
}
|
||||
|
||||
compileArgument(operator, args) {
|
||||
switch ( operator ) {
|
||||
case ':has':
|
||||
return this.compileConditionalSelector(args);
|
||||
case ':has-text':
|
||||
return this.compileText(args);
|
||||
case ':if':
|
||||
return this.compileConditionalSelector(args);
|
||||
case ':if-not':
|
||||
return this.compileConditionalSelector(args);
|
||||
case ':matches-css':
|
||||
return this.compileCSSDeclaration(args);
|
||||
case ':matches-css-after':
|
||||
return this.compileCSSDeclaration(args);
|
||||
case ':matches-css-before':
|
||||
return this.compileCSSDeclaration(args);
|
||||
case ':min-text-length':
|
||||
return this.compileInteger(args);
|
||||
case ':not':
|
||||
return this.compileNotSelector(args);
|
||||
case ':remove':
|
||||
return this.compileRemoveSelector(args);
|
||||
case ':spath':
|
||||
return this.compileSpathExpression(args);
|
||||
case ':style':
|
||||
return this.compileStyleProperties(args);
|
||||
case ':upward':
|
||||
return this.compileUpwardArgument(args);
|
||||
case ':watch-attr':
|
||||
return this.compileAttrList(args);
|
||||
case ':xpath':
|
||||
return this.compileXpathExpression(args);
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
/******************************************************************************/
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user