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Diffstat (limited to 'vanilla/node_modules/@acemir/cssom/lib/parse.js')
| -rw-r--r-- | vanilla/node_modules/@acemir/cssom/lib/parse.js | 3332 |
1 files changed, 0 insertions, 3332 deletions
diff --git a/vanilla/node_modules/@acemir/cssom/lib/parse.js b/vanilla/node_modules/@acemir/cssom/lib/parse.js deleted file mode 100644 index 09d4ade..0000000 --- a/vanilla/node_modules/@acemir/cssom/lib/parse.js +++ /dev/null @@ -1,3332 +0,0 @@ -//.CommonJS -var CSSOM = {}; -var regexPatterns = require("./regexPatterns").regexPatterns; -///CommonJS - -/** - * Parses a CSS string and returns a `CSSStyleSheet` object representing the parsed stylesheet. - * - * @param {string} token - The CSS string to parse. - * @param {object} [opts] - Optional parsing options. - * @param {object} [opts.globalObject] - An optional global object to prioritize over the window object. Useful on jsdom webplatform tests. - * @param {Element | ProcessingInstruction} [opts.ownerNode] - The owner node of the stylesheet. - * @param {CSSRule} [opts.ownerRule] - The owner rule of the stylesheet. - * @param {CSSOM.CSSStyleSheet} [opts.styleSheet] - Reuse a style sheet instead of creating a new one (e.g. as `parentStyleSheet`) - * @param {CSSOM.CSSRuleList} [opts.cssRules] - Prepare all rules in this list instead of mutating the style sheet continually - * @param {function|boolean} [errorHandler] - Optional error handler function or `true` to use `console.error`. - * @returns {CSSOM.CSSStyleSheet} The parsed `CSSStyleSheet` object. - */ -CSSOM.parse = function parse(token, opts, errorHandler) { - errorHandler = errorHandler === true ? (console && console.error) : errorHandler; - - var i = 0; - - /** - "before-selector" or - "selector" or - "atRule" or - "atBlock" or - "conditionBlock" or - "before-name" or - "name" or - "before-value" or - "value" - */ - var state = "before-selector"; - - var index; - var buffer = ""; - var valueParenthesisDepth = 0; - var hasUnmatchedQuoteInSelector = false; // Track if current selector has unmatched quote - - var SIGNIFICANT_WHITESPACE = { - "name": true, - "before-name": true, - "selector": true, - "value": true, - "value-parenthesis": true, - "atRule": true, - "importRule-begin": true, - "importRule": true, - "namespaceRule-begin": true, - "namespaceRule": true, - "atBlock": true, - "containerBlock": true, - "conditionBlock": true, - "counterStyleBlock": true, - "propertyBlock": true, - 'documentRule-begin': true, - "scopeBlock": true, - "layerBlock": true, - "pageBlock": true - }; - - var styleSheet; - if (opts && opts.styleSheet) { - styleSheet = opts.styleSheet; - } else { - if (opts && opts.globalObject && opts.globalObject.CSSStyleSheet) { - styleSheet = new opts.globalObject.CSSStyleSheet(); - } else { - styleSheet = new CSSOM.CSSStyleSheet(); - } - styleSheet.__constructed = false; - } - - var topScope; - if (opts && opts.cssRules) { - topScope = { cssRules: opts.cssRules }; - } else { - topScope = styleSheet; - } - - if (opts && opts.ownerNode) { - styleSheet.__ownerNode = opts.ownerNode; - var ownerNodeMedia = opts.ownerNode.media || (opts.ownerNode.getAttribute && opts.ownerNode.getAttribute("media")); - if (ownerNodeMedia) { - styleSheet.media.mediaText = ownerNodeMedia; - } - var ownerNodeTitle = opts.ownerNode.title || (opts.ownerNode.getAttribute && opts.ownerNode.getAttribute("title")); - if (ownerNodeTitle) { - styleSheet.__title = ownerNodeTitle; - } - } - - if (opts && opts.ownerRule) { - styleSheet.__ownerRule = opts.ownerRule; - } - - // @type CSSStyleSheet|CSSMediaRule|CSSContainerRule|CSSSupportsRule|CSSFontFaceRule|CSSKeyframesRule|CSSDocumentRule - var currentScope = topScope; - - // @type CSSMediaRule|CSSContainerRule|CSSSupportsRule|CSSKeyframesRule|CSSDocumentRule - var parentRule; - - var ancestorRules = []; - var prevScope; - - var name, priority = "", styleRule, mediaRule, containerRule, counterStyleRule, propertyRule, supportsRule, importRule, fontFaceRule, keyframesRule, documentRule, hostRule, startingStyleRule, scopeRule, pageRule, layerBlockRule, layerStatementRule, nestedSelectorRule, namespaceRule; - - // Track defined namespace prefixes for validation - var definedNamespacePrefixes = {}; - - // Track which rules have been added - var ruleIdCounter = 0; - var addedToParent = {}; - var addedToTopScope = {}; - var addedToCurrentScope = {}; - - // Helper to get unique ID for tracking rules - function getRuleId(rule) { - if (!rule.__parseId) { - rule.__parseId = ++ruleIdCounter; - } - return rule.__parseId; - } - - // Cache last validation boundary position - // to avoid rescanning the entire token string for each at-rule - var lastValidationBoundary = 0; - - // Pre-compile validation regexes for common at-rules - var validationRegexCache = {}; - function getValidationRegex(atRuleKey) { - if (!validationRegexCache[atRuleKey]) { - var sourceRuleRegExp = atRuleKey === "@import" ? forwardImportRuleValidationRegExp : forwardRuleValidationRegExp; - validationRegexCache[atRuleKey] = new RegExp(atRuleKey + sourceRuleRegExp.source, sourceRuleRegExp.flags); - } - return validationRegexCache[atRuleKey]; - } - - // Import regex patterns from shared module - var atKeyframesRegExp = regexPatterns.atKeyframesRegExp; - var beforeRulePortionRegExp = regexPatterns.beforeRulePortionRegExp; - var beforeRuleValidationRegExp = regexPatterns.beforeRuleValidationRegExp; - var forwardRuleValidationRegExp = regexPatterns.forwardRuleValidationRegExp; - var forwardImportRuleValidationRegExp = regexPatterns.forwardImportRuleValidationRegExp; - - // Pre-compile regexBefore to avoid creating it on every validateAtRule call - var regexBefore = new RegExp(beforeRulePortionRegExp.source, beforeRulePortionRegExp.flags); - var forwardRuleClosingBraceRegExp = regexPatterns.forwardRuleClosingBraceRegExp; - var forwardRuleSemicolonAndOpeningBraceRegExp = regexPatterns.forwardRuleSemicolonAndOpeningBraceRegExp; - var cssCustomIdentifierRegExp = regexPatterns.cssCustomIdentifierRegExp; - var startsWithCombinatorRegExp = regexPatterns.startsWithCombinatorRegExp; - var atPageRuleSelectorRegExp = regexPatterns.atPageRuleSelectorRegExp; - var startsWithHexEscapeRegExp = regexPatterns.startsWithHexEscapeRegExp; - var identStartCharRegExp = regexPatterns.identStartCharRegExp; - var identCharRegExp = regexPatterns.identCharRegExp; - var specialCharsNeedEscapeRegExp = regexPatterns.specialCharsNeedEscapeRegExp; - var combinatorOrSeparatorRegExp = regexPatterns.combinatorOrSeparatorRegExp; - var afterHexEscapeSeparatorRegExp = regexPatterns.afterHexEscapeSeparatorRegExp; - var trailingSpaceSeparatorRegExp = regexPatterns.trailingSpaceSeparatorRegExp; - var endsWithHexEscapeRegExp = regexPatterns.endsWithHexEscapeRegExp; - var attributeSelectorContentRegExp = regexPatterns.attributeSelectorContentRegExp; - var pseudoElementRegExp = regexPatterns.pseudoElementRegExp; - var invalidCombinatorLtGtRegExp = regexPatterns.invalidCombinatorLtGtRegExp; - var invalidCombinatorDoubleGtRegExp = regexPatterns.invalidCombinatorDoubleGtRegExp; - var consecutiveCombinatorsRegExp = regexPatterns.consecutiveCombinatorsRegExp; - var invalidSlottedRegExp = regexPatterns.invalidSlottedRegExp; - var invalidPartRegExp = regexPatterns.invalidPartRegExp; - var invalidCueRegExp = regexPatterns.invalidCueRegExp; - var invalidCueRegionRegExp = regexPatterns.invalidCueRegionRegExp; - var invalidNestingPattern = regexPatterns.invalidNestingPattern; - var emptyPseudoClassRegExp = regexPatterns.emptyPseudoClassRegExp; - var whitespaceNormalizationRegExp = regexPatterns.whitespaceNormalizationRegExp; - var newlineRemovalRegExp = regexPatterns.newlineRemovalRegExp; - var whitespaceAndDotRegExp = regexPatterns.whitespaceAndDotRegExp; - var declarationOrOpenBraceRegExp = regexPatterns.declarationOrOpenBraceRegExp; - var ampersandRegExp = regexPatterns.ampersandRegExp; - var hexEscapeSequenceRegExp = regexPatterns.hexEscapeSequenceRegExp; - var attributeCaseFlagRegExp = regexPatterns.attributeCaseFlagRegExp; - var prependedAmpersandRegExp = regexPatterns.prependedAmpersandRegExp; - var openBraceGlobalRegExp = regexPatterns.openBraceGlobalRegExp; - var closeBraceGlobalRegExp = regexPatterns.closeBraceGlobalRegExp; - var scopePreludeSplitRegExp = regexPatterns.scopePreludeSplitRegExp; - var leadingWhitespaceRegExp = regexPatterns.leadingWhitespaceRegExp; - var doubleQuoteRegExp = regexPatterns.doubleQuoteRegExp; - var backslashRegExp = regexPatterns.backslashRegExp; - - /** - * Searches for the first occurrence of a CSS at-rule statement terminator (`;` or `}`) - * that is not inside a brace block within the given string. Mimics the behavior of a - * regular expression match for such terminators, including any trailing whitespace. - * @param {string} str - The string to search for at-rule statement terminators. - * @returns {object | null} {0: string, index: number} or null if no match is found. - */ - function atRulesStatemenRegExpES5Alternative(ruleSlice) { - for (var i = 0; i < ruleSlice.length; i++) { - var char = ruleSlice[i]; - - if (char === ';' || char === '}') { - // Simulate negative lookbehind: check if there is a { before this position - var sliceBefore = ruleSlice.substring(0, i); - var openBraceIndex = sliceBefore.indexOf('{'); - - if (openBraceIndex === -1) { - // No { found before, so we treat it as a valid match - var match = char; - var j = i + 1; - - while (j < ruleSlice.length && /\s/.test(ruleSlice[j])) { - match += ruleSlice[j]; - j++; - } - - var matchObj = [match]; - matchObj.index = i; - matchObj.input = ruleSlice; - return matchObj; - } - } - } - - return null; - } - - /** - * Finds the first balanced block (including nested braces) in the string, starting from fromIndex. - * Returns an object similar to RegExp.prototype.match output. - * @param {string} str - The string to search. - * @param {number} [fromIndex=0] - The index to start searching from. - * @returns {object|null} - { 0: matchedString, index: startIndex, input: str } or null if not found. - */ - function matchBalancedBlock(str, fromIndex) { - fromIndex = fromIndex || 0; - var openIndex = str.indexOf('{', fromIndex); - if (openIndex === -1) return null; - var depth = 0; - for (var i = openIndex; i < str.length; i++) { - if (str[i] === '{') { - depth++; - } else if (str[i] === '}') { - depth--; - if (depth === 0) { - var matchedString = str.slice(openIndex, i + 1); - return { - 0: matchedString, - index: openIndex, - input: str - }; - } - } - } - return null; - } - - /** - * Advances the index `i` to skip over a balanced block of curly braces in the given string. - * This is typically used to ignore the contents of a CSS rule block. - * - * @param {number} i - The current index in the string to start searching from. - * @param {string} str - The string containing the CSS code. - * @param {number} fromIndex - The index in the string where the balanced block search should begin. - * @returns {number} The updated index after skipping the balanced block. - */ - function ignoreBalancedBlock(i, str, fromIndex) { - var ruleClosingMatch = matchBalancedBlock(str, fromIndex); - if (ruleClosingMatch) { - var ignoreRange = ruleClosingMatch.index + ruleClosingMatch[0].length; - i += ignoreRange; - if (token.charAt(i) === '}') { - i -= 1; - } - } else { - i += str.length; - } - return i; - } - - /** - * Parses the scope prelude and extracts start and end selectors. - * @param {string} preludeContent - The scope prelude content (without @scope keyword) - * @returns {object} Object with startSelector and endSelector properties - */ - function parseScopePrelude(preludeContent) { - var parts = preludeContent.split(scopePreludeSplitRegExp); - - // Restore the parentheses that were consumed by the split - if (parts.length === 2) { - parts[0] = parts[0] + ')'; - parts[1] = '(' + parts[1]; - } - - var hasStart = parts[0] && - parts[0].charAt(0) === '(' && - parts[0].charAt(parts[0].length - 1) === ')'; - var hasEnd = parts[1] && - parts[1].charAt(0) === '(' && - parts[1].charAt(parts[1].length - 1) === ')'; - - // Handle case: @scope to (<end>) - var hasOnlyEnd = !hasStart && - !hasEnd && - parts[0].indexOf('to (') === 0 && - parts[0].charAt(parts[0].length - 1) === ')'; - - var startSelector = ''; - var endSelector = ''; - - if (hasStart) { - startSelector = parts[0].slice(1, -1).trim(); - } - if (hasEnd) { - endSelector = parts[1].slice(1, -1).trim(); - } - if (hasOnlyEnd) { - endSelector = parts[0].slice(4, -1).trim(); - } - - return { - startSelector: startSelector, - endSelector: endSelector, - hasStart: hasStart, - hasEnd: hasEnd, - hasOnlyEnd: hasOnlyEnd - }; - }; - - /** - * Checks if a selector contains pseudo-elements. - * @param {string} selector - The CSS selector to check - * @returns {boolean} True if the selector contains pseudo-elements - */ - function hasPseudoElement(selector) { - // Match only double-colon (::) pseudo-elements - // Also match legacy single-colon pseudo-elements: :before, :after, :first-line, :first-letter - // These must NOT be followed by alphanumeric characters (to avoid matching :before-x or similar) - return pseudoElementRegExp.test(selector); - }; - - /** - * Validates balanced parentheses, brackets, and quotes in a selector. - * - * @param {string} selector - The CSS selector to validate - * @param {boolean} trackAttributes - Whether to track attribute selector context - * @param {boolean} useStack - Whether to use a stack for parentheses (needed for nested validation) - * @returns {boolean} True if the syntax is valid (all brackets, parentheses, and quotes are balanced) - */ - function validateBalancedSyntax(selector, trackAttributes, useStack) { - var parenDepth = 0; - var bracketDepth = 0; - var inSingleQuote = false; - var inDoubleQuote = false; - var inAttr = false; - var stack = useStack ? [] : null; - - for (var i = 0; i < selector.length; i++) { - var char = selector[i]; - - // Handle escape sequences - skip hex escapes or simple escapes - if (char === '\\') { - var escapeLen = getEscapeSequenceLength(selector, i); - if (escapeLen > 0) { - i += escapeLen - 1; // -1 because loop will increment - continue; - } - } - - if (inSingleQuote) { - if (char === "'") { - inSingleQuote = false; - } - } else if (inDoubleQuote) { - if (char === '"') { - inDoubleQuote = false; - } - } else if (trackAttributes && inAttr) { - if (char === "]") { - inAttr = false; - } else if (char === "'") { - inSingleQuote = true; - } else if (char === '"') { - inDoubleQuote = true; - } - } else { - if (trackAttributes && char === "[") { - inAttr = true; - } else if (char === "'") { - inSingleQuote = true; - } else if (char === '"') { - inDoubleQuote = true; - } else if (char === '(') { - if (useStack) { - stack.push("("); - } else { - parenDepth++; - } - } else if (char === ')') { - if (useStack) { - if (!stack.length || stack.pop() !== "(") { - return false; - } - } else { - parenDepth--; - if (parenDepth < 0) { - return false; - } - } - } else if (char === '[') { - bracketDepth++; - } else if (char === ']') { - bracketDepth--; - if (bracketDepth < 0) { - return false; - } - } - } - } - - // Check if everything is balanced - if (useStack) { - return stack.length === 0 && bracketDepth === 0 && !inSingleQuote && !inDoubleQuote && !inAttr; - } else { - return parenDepth === 0 && bracketDepth === 0 && !inSingleQuote && !inDoubleQuote; - } - }; - - /** - * Checks for basic syntax errors in selectors (mismatched parentheses, brackets, quotes). - * @param {string} selector - The CSS selector to check - * @returns {boolean} True if there are syntax errors - */ - function hasBasicSyntaxError(selector) { - return !validateBalancedSyntax(selector, false, false); - }; - - /** - * Checks for invalid combinator patterns in selectors. - * @param {string} selector - The CSS selector to check - * @returns {boolean} True if the selector contains invalid combinators - */ - function hasInvalidCombinators(selector) { - // Check for invalid combinator patterns: - // - <> (not a valid combinator) - // - >> (deep descendant combinator, deprecated and invalid) - // - Multiple consecutive combinators like >>, >~, etc. - if (invalidCombinatorLtGtRegExp.test(selector)) return true; - if (invalidCombinatorDoubleGtRegExp.test(selector)) return true; - // Check for other invalid consecutive combinator patterns - if (consecutiveCombinatorsRegExp.test(selector)) return true; - return false; - }; - - /** - * Checks for invalid pseudo-like syntax (function calls without proper pseudo prefix). - * @param {string} selector - The CSS selector to check - * @returns {boolean} True if the selector contains invalid pseudo-like syntax - */ - function hasInvalidPseudoSyntax(selector) { - // Check for specific known pseudo-elements used without : or :: prefix - // Examples: slotted(div), part(name), cue(selector) - // These are ONLY valid as ::slotted(), ::part(), ::cue() - var invalidPatterns = [ - invalidSlottedRegExp, - invalidPartRegExp, - invalidCueRegExp, - invalidCueRegionRegExp - ]; - - for (var i = 0; i < invalidPatterns.length; i++) { - if (invalidPatterns[i].test(selector)) { - return true; - } - } - return false; - }; - - /** - * Checks for invalid nesting selector (&) usage. - * The & selector cannot be directly followed by a type selector without a delimiter. - * Valid: &.class, &#id, &[attr], &:hover, &::before, & div, &>div - * Invalid: &div, &span - * @param {string} selector - The CSS selector to check - * @returns {boolean} True if the selector contains invalid & usage - */ - function hasInvalidNestingSelector(selector) { - // Check for & followed directly by a letter (type selector) without any delimiter - // This regex matches & followed by a letter (start of type selector) that's not preceded by an escape - // We need to exclude valid cases like &.class, &#id, &[attr], &:pseudo, &::pseudo, & (with space), &> - return invalidNestingPattern.test(selector); - }; - - /** - * Checks if an at-rule can be nested based on parent chain validation. - * Used for at-rules like `@counter-style`, `@property` and `@font-face` rules that can only be nested inside - * `CSSScopeRule` or `CSSConditionRule` without `CSSStyleRule` in parent chain. - * @returns {boolean} `true` if nesting is allowed, `false` otherwise - */ - function canAtRuleBeNested() { - if (currentScope === topScope) { - return true; // Top-level is always allowed - } - - var hasStyleRuleInChain = false; - var hasValidParent = false; - - // Check currentScope - if (currentScope.constructor.name === 'CSSStyleRule') { - hasStyleRuleInChain = true; - } else if (currentScope instanceof CSSOM.CSSScopeRule || currentScope instanceof CSSOM.CSSConditionRule) { - hasValidParent = true; - } - - // Check ancestorRules for CSSStyleRule - if (!hasStyleRuleInChain) { - for (var j = 0; j < ancestorRules.length; j++) { - if (ancestorRules[j].constructor.name === 'CSSStyleRule') { - hasStyleRuleInChain = true; - break; - } - if (ancestorRules[j] instanceof CSSOM.CSSScopeRule || ancestorRules[j] instanceof CSSOM.CSSConditionRule) { - hasValidParent = true; - } - } - } - - // Allow nesting if we have a valid parent and no style rule in the chain - return hasValidParent && !hasStyleRuleInChain; - } - - function validateAtRule(atRuleKey, validCallback, cannotBeNested) { - var isValid = false; - // Use cached regex instead of creating new one each time - var ruleRegExp = getValidationRegex(atRuleKey); - // Only slice what we need for validation (max 100 chars) - // since we only check match at position 0 - var lookAheadLength = Math.min(100, token.length - i); - var ruleSlice = token.slice(i, i + lookAheadLength); - // Not all rules can be nested, if the rule cannot be nested and is in the root scope, do not perform the check - var shouldPerformCheck = cannotBeNested && currentScope !== topScope ? false : true; - // First, check if there is no invalid characters just after the at-rule - if (shouldPerformCheck && ruleSlice.search(ruleRegExp) === 0) { - // Only scan from the last known validation boundary - var searchStart = Math.max(0, lastValidationBoundary); - var beforeSlice = token.slice(searchStart, i); - - // Use pre-compiled regex instead of creating new one each time - var matches = beforeSlice.match(regexBefore); - var lastI = matches ? searchStart + beforeSlice.lastIndexOf(matches[matches.length - 1]) : searchStart; - var toCheckSlice = token.slice(lastI, i); - // Check if we don't have any invalid in the portion before the `at-rule` and the closest allowed character - var checkedSlice = toCheckSlice.search(beforeRuleValidationRegExp); - if (checkedSlice === 0) { - isValid = true; - // Update the validation boundary cache to this position - lastValidationBoundary = lastI; - } - } - - // Additional validation for @scope rule - if (isValid && atRuleKey === "@scope") { - var openBraceIndex = ruleSlice.indexOf('{'); - if (openBraceIndex !== -1) { - // Extract the rule prelude (everything between the at-rule and {) - var rulePrelude = ruleSlice.slice(0, openBraceIndex).trim(); - - // Skip past at-rule keyword and whitespace - var preludeContent = rulePrelude.slice("@scope".length).trim(); - - if (preludeContent.length > 0) { - // Parse the scope prelude - var parsedScopePrelude = parseScopePrelude(preludeContent); - var startSelector = parsedScopePrelude.startSelector; - var endSelector = parsedScopePrelude.endSelector; - var hasStart = parsedScopePrelude.hasStart; - var hasEnd = parsedScopePrelude.hasEnd; - var hasOnlyEnd = parsedScopePrelude.hasOnlyEnd; - - // Validation rules for @scope: - // 1. Empty selectors in parentheses are invalid: @scope () {} or @scope (.a) to () {} - if ((hasStart && startSelector === '') || (hasEnd && endSelector === '') || (hasOnlyEnd && endSelector === '')) { - isValid = false; - } - // 2. Pseudo-elements are invalid in scope selectors - else if ((startSelector && hasPseudoElement(startSelector)) || (endSelector && hasPseudoElement(endSelector))) { - isValid = false; - } - // 3. Basic syntax errors (mismatched parens, brackets, quotes) - else if ((startSelector && hasBasicSyntaxError(startSelector)) || (endSelector && hasBasicSyntaxError(endSelector))) { - isValid = false; - } - // 4. Invalid combinator patterns - else if ((startSelector && hasInvalidCombinators(startSelector)) || (endSelector && hasInvalidCombinators(endSelector))) { - isValid = false; - } - // 5. Invalid pseudo-like syntax (function without : or :: prefix) - else if ((startSelector && hasInvalidPseudoSyntax(startSelector)) || (endSelector && hasInvalidPseudoSyntax(endSelector))) { - isValid = false; - } - // 6. Invalid structure (no proper parentheses found when prelude is not empty) - else if (!hasStart && !hasOnlyEnd) { - isValid = false; - } - } - // Empty prelude (@scope {}) is valid - } - } - - if (isValid && atRuleKey === "@page") { - var openBraceIndex = ruleSlice.indexOf('{'); - if (openBraceIndex !== -1) { - // Extract the rule prelude (everything between the at-rule and {) - var rulePrelude = ruleSlice.slice(0, openBraceIndex).trim(); - - // Skip past at-rule keyword and whitespace - var preludeContent = rulePrelude.slice("@page".length).trim(); - - if (preludeContent.length > 0) { - var trimmedValue = preludeContent.trim(); - - // Empty selector is valid for @page - if (trimmedValue !== '') { - // Parse @page selectorText for page name and pseudo-pages - // Valid formats: - // - (empty - no name, no pseudo-page) - // - :left, :right, :first, :blank (pseudo-page only) - // - named (named page only) - // - named:first (named page with single pseudo-page) - // - named:first:left (named page with multiple pseudo-pages) - var match = trimmedValue.match(atPageRuleSelectorRegExp); - if (match) { - var pageName = match[1] || ''; - var pseudoPages = match[2] || ''; - - // Validate page name if present - if (pageName) { - if (!cssCustomIdentifierRegExp.test(pageName)) { - isValid = false; - } - } - - // Validate pseudo-pages if present - if (pseudoPages) { - var pseudos = pseudoPages.split(':').filter(function (p) { return p; }); - var validPseudos = ['left', 'right', 'first', 'blank']; - var allValid = true; - for (var j = 0; j < pseudos.length; j++) { - if (validPseudos.indexOf(pseudos[j].toLowerCase()) === -1) { - allValid = false; - break; - } - } - - if (!allValid) { - isValid = false; - } - } - } else { - isValid = false; - } - } - - } - } - } - - if (!isValid) { - // If it's invalid the browser will simply ignore the entire invalid block - // Use regex to find the closing brace of the invalid rule - - // Regex used above is not ES5 compliant. Using alternative. - // var ruleStatementMatch = ruleSlice.match(atRulesStatemenRegExp); // - var ruleStatementMatch = atRulesStatemenRegExpES5Alternative(ruleSlice); - - // If it's a statement inside a nested rule, ignore only the statement - if (ruleStatementMatch && currentScope !== topScope) { - var ignoreEnd = ruleStatementMatch[0].indexOf(";"); - i += ruleStatementMatch.index + ignoreEnd; - return; - } - - // Check if there's a semicolon before the invalid at-rule and the first opening brace - if (atRuleKey === "@layer") { - var ruleSemicolonAndOpeningBraceMatch = ruleSlice.match(forwardRuleSemicolonAndOpeningBraceRegExp); - if (ruleSemicolonAndOpeningBraceMatch && ruleSemicolonAndOpeningBraceMatch[1] === ";") { - // Ignore the rule block until the semicolon - i += ruleSemicolonAndOpeningBraceMatch.index + ruleSemicolonAndOpeningBraceMatch[0].length; - state = "before-selector"; - return; - } - } - - // Ignore the entire rule block (if it's a statement it should ignore the statement plus the next block) - i = ignoreBalancedBlock(i, ruleSlice); - state = "before-selector"; - } else { - validCallback.call(this); - } - } - - // Helper functions for looseSelectorValidator - // Defined outside to avoid recreation on every validation call - - /** - * Check if character is a valid identifier start - * @param {string} c - Character to check - * @returns {boolean} - */ - function isIdentStart(c) { - return /[a-zA-Z_\u00A0-\uFFFF]/.test(c); - } - - /** - * Check if character is a valid identifier character - * @param {string} c - Character to check - * @returns {boolean} - */ - function isIdentChar(c) { - return /[a-zA-Z0-9_\u00A0-\uFFFF\-]/.test(c); - } - - /** - * Helper function to validate CSS selector syntax without regex backtracking. - * Iteratively parses the selector string to identify valid components. - * - * Supports: - * - Escaped characters (e.g., .class\!, #id\@name) - * - Namespace selectors (ns|element, *|element, |element) - * - All standard CSS selectors (class, ID, type, attribute, pseudo, etc.) - * - Combinators (>, +, ~, whitespace) - * - Nesting selector (&) - * - * This approach eliminates exponential backtracking by using explicit character-by-character - * parsing instead of nested quantifiers in regex. - * - * @param {string} selector - The selector to validate - * @returns {boolean} - True if valid selector syntax - */ - function looseSelectorValidator(selector) { - if (!selector || selector.length === 0) { - return false; - } - - var i = 0; - var len = selector.length; - var hasMatchedComponent = false; - - // Helper: Skip escaped character (backslash + hex escape or any char) - function skipEscape() { - if (i < len && selector[i] === '\\') { - var escapeLen = getEscapeSequenceLength(selector, i); - if (escapeLen > 0) { - i += escapeLen; // Skip entire escape sequence - return true; - } - } - return false; - } - - // Helper: Parse identifier (with possible escapes) - function parseIdentifier() { - var start = i; - while (i < len) { - if (skipEscape()) { - continue; - } else if (isIdentChar(selector[i])) { - i++; - } else { - break; - } - } - return i > start; - } - - // Helper: Parse namespace prefix (optional) - function parseNamespace() { - var start = i; - - // Match: *| or identifier| or | - if (i < len && selector[i] === '*') { - i++; - } else if (i < len && (isIdentStart(selector[i]) || selector[i] === '\\')) { - parseIdentifier(); - } - - if (i < len && selector[i] === '|') { - i++; - return true; - } - - // Rollback if no pipe found - i = start; - return false; - } - - // Helper: Parse pseudo-class/element arguments (with balanced parens) - function parsePseudoArgs() { - if (i >= len || selector[i] !== '(') { - return false; - } - - i++; // Skip opening paren - var depth = 1; - var inString = false; - var stringChar = ''; - - while (i < len && depth > 0) { - var c = selector[i]; - - if (c === '\\' && i + 1 < len) { - i += 2; // Skip escaped character - } else if (!inString && (c === '"' || c === '\'')) { - inString = true; - stringChar = c; - i++; - } else if (inString && c === stringChar) { - inString = false; - i++; - } else if (!inString && c === '(') { - depth++; - i++; - } else if (!inString && c === ')') { - depth--; - i++; - } else { - i++; - } - } - - return depth === 0; - } - - // Main parsing loop - while (i < len) { - var matched = false; - var start = i; - - // Skip whitespace - while (i < len && /\s/.test(selector[i])) { - i++; - } - if (i > start) { - hasMatchedComponent = true; - continue; - } - - // Match combinators: >, +, ~ - if (i < len && /[>+~]/.test(selector[i])) { - i++; - hasMatchedComponent = true; - // Skip trailing whitespace - while (i < len && /\s/.test(selector[i])) { - i++; - } - continue; - } - - // Match nesting selector: & - if (i < len && selector[i] === '&') { - i++; - hasMatchedComponent = true; - matched = true; - } - // Match class selector: .identifier - else if (i < len && selector[i] === '.') { - i++; - if (parseIdentifier()) { - hasMatchedComponent = true; - matched = true; - } - } - // Match ID selector: #identifier - else if (i < len && selector[i] === '#') { - i++; - if (parseIdentifier()) { - hasMatchedComponent = true; - matched = true; - } - } - // Match pseudo-class/element: :identifier or ::identifier - else if (i < len && selector[i] === ':') { - i++; - if (i < len && selector[i] === ':') { - i++; // Pseudo-element - } - if (parseIdentifier()) { - parsePseudoArgs(); // Optional arguments - hasMatchedComponent = true; - matched = true; - } - } - // Match attribute selector: [...] - else if (i < len && selector[i] === '[') { - i++; - var depth = 1; - while (i < len && depth > 0) { - if (selector[i] === '\\') { - i += 2; - } else if (selector[i] === '\'') { - i++; - while (i < len && selector[i] !== '\'') { - if (selector[i] === '\\') i += 2; - else i++; - } - if (i < len) i++; // Skip closing quote - } else if (selector[i] === '"') { - i++; - while (i < len && selector[i] !== '"') { - if (selector[i] === '\\') i += 2; - else i++; - } - if (i < len) i++; // Skip closing quote - } else if (selector[i] === '[') { - depth++; - i++; - } else if (selector[i] === ']') { - depth--; - i++; - } else { - i++; - } - } - if (depth === 0) { - hasMatchedComponent = true; - matched = true; - } - } - // Match type selector with optional namespace: [namespace|]identifier - else if (i < len && (isIdentStart(selector[i]) || selector[i] === '\\' || selector[i] === '*' || selector[i] === '|')) { - parseNamespace(); // Optional namespace prefix - - if (i < len && selector[i] === '*') { - i++; // Universal selector - hasMatchedComponent = true; - matched = true; - } else if (i < len && (isIdentStart(selector[i]) || selector[i] === '\\')) { - if (parseIdentifier()) { - hasMatchedComponent = true; - matched = true; - } - } - } - - // If no match found, invalid selector - if (!matched && i === start) { - return false; - } - } - - return hasMatchedComponent; - } - - /** - * Validates a basic CSS selector, allowing for deeply nested balanced parentheses in pseudo-classes. - * This function replaces the previous basicSelectorRegExp. - * - * This function matches: - * - Type selectors (e.g., `div`, `span`) - * - Universal selector (`*`) - * - Namespace selectors (e.g., `*|div`, `custom|div`, `|div`) - * - ID selectors (e.g., `#header`, `#a\ b`, `#åèiöú`) - * - Class selectors (e.g., `.container`, `.a\ b`, `.åèiöú`) - * - Attribute selectors (e.g., `[type="text"]`) - * - Pseudo-classes and pseudo-elements (e.g., `:hover`, `::before`, `:nth-child(2)`) - * - Pseudo-classes with nested parentheses, including cases where parentheses are nested inside arguments, - * such as `:has(.sel:nth-child(3n))` - * - The parent selector (`&`) - * - Combinators (`>`, `+`, `~`) with optional whitespace - * - Whitespace (descendant combinator) - * - * Unicode and escape sequences are allowed in identifiers. - * - * @param {string} selector - * @returns {boolean} - */ - function basicSelectorValidator(selector) { - // Guard against extremely long selectors to prevent potential regex performance issues - // Reasonable selectors are typically under 1000 characters - if (selector.length > 10000) { - return false; - } - - // Validate balanced syntax with attribute tracking and stack-based parentheses matching - if (!validateBalancedSyntax(selector, true, true)) { - return false; - } - - // Check for invalid combinator patterns - if (hasInvalidCombinators(selector)) { - return false; - } - - // Check for invalid pseudo-like syntax - if (hasInvalidPseudoSyntax(selector)) { - return false; - } - - // Check for invalid nesting selector (&) usage - if (hasInvalidNestingSelector(selector)) { - return false; - } - - // Check for invalid pseudo-class usage with quoted strings - // Pseudo-classes like :lang(), :dir(), :nth-*() should not accept quoted strings - // Using iterative parsing instead of regex to avoid exponential backtracking - var noQuotesPseudos = ['lang', 'dir', 'nth-child', 'nth-last-child', 'nth-of-type', 'nth-last-of-type']; - - for (var idx = 0; idx < selector.length; idx++) { - // Look for pseudo-class/element start - if (selector[idx] === ':') { - var pseudoStart = idx; - idx++; - - // Skip second colon for pseudo-elements - if (idx < selector.length && selector[idx] === ':') { - idx++; - } - - // Extract pseudo name - var nameStart = idx; - while (idx < selector.length && /[a-zA-Z0-9\-]/.test(selector[idx])) { - idx++; - } - - if (idx === nameStart) { - continue; // No name found - } - - var pseudoName = selector.substring(nameStart, idx).toLowerCase(); - - // Check if this pseudo has arguments - if (idx < selector.length && selector[idx] === '(') { - idx++; - var contentStart = idx; - var depth = 1; - - // Find matching closing paren (handle nesting) - while (idx < selector.length && depth > 0) { - if (selector[idx] === '\\') { - idx += 2; // Skip escaped character - } else if (selector[idx] === '(') { - depth++; - idx++; - } else if (selector[idx] === ')') { - depth--; - idx++; - } else { - idx++; - } - } - - if (depth === 0) { - var pseudoContent = selector.substring(contentStart, idx - 1); - - // Check if this pseudo should not have quoted strings - for (var j = 0; j < noQuotesPseudos.length; j++) { - if (pseudoName === noQuotesPseudos[j] && /['"]/.test(pseudoContent)) { - return false; - } - } - } - } - } - } - - // Use the iterative validator to avoid regex backtracking issues - return looseSelectorValidator(selector); - } - - /** - * Regular expression to match CSS pseudo-classes with arguments. - * - * Matches patterns like `:pseudo-class(argument)`, capturing the pseudo-class name and its argument. - * - * Capture groups: - * 1. The pseudo-class name (letters and hyphens). - * 2. The argument inside the parentheses (can contain nested parentheses, quoted strings, and other characters.). - * - * Global flag (`g`) is used to find all matches in the input string. - * - * Example matches: - * - :nth-child(2n+1) - * - :has(.sel:nth-child(3n)) - * - :not(".foo, .bar") - * - * REPLACED WITH FUNCTION to avoid exponential backtracking. - */ - - /** - * Extract pseudo-classes with arguments from a selector using iterative parsing. - * Replaces the previous globalPseudoClassRegExp to avoid exponential backtracking. - * - * Handles: - * - Regular content without parentheses or quotes - * - Single-quoted strings - * - Double-quoted strings - * - Nested parentheses (arbitrary depth) - * - * @param {string} selector - The CSS selector to parse - * @returns {Array} Array of matches, each with: [fullMatch, pseudoName, pseudoArgs, startIndex] - */ - function extractPseudoClasses(selector) { - var matches = []; - - for (var i = 0; i < selector.length; i++) { - // Look for pseudo-class start (single or double colon) - if (selector[i] === ':') { - var pseudoStart = i; - i++; - - // Skip second colon for pseudo-elements (::) - if (i < selector.length && selector[i] === ':') { - i++; - } - - // Extract pseudo name - var nameStart = i; - while (i < selector.length && /[a-zA-Z\-]/.test(selector[i])) { - i++; - } - - if (i === nameStart) { - continue; // No name found - } - - var pseudoName = selector.substring(nameStart, i); - - // Check if this pseudo has arguments - if (i < selector.length && selector[i] === '(') { - i++; - var argsStart = i; - var depth = 1; - var inSingleQuote = false; - var inDoubleQuote = false; - - // Find matching closing paren (handle nesting and strings) - while (i < selector.length && depth > 0) { - var ch = selector[i]; - - if (ch === '\\') { - i += 2; // Skip escaped character - } else if (ch === "'" && !inDoubleQuote) { - inSingleQuote = !inSingleQuote; - i++; - } else if (ch === '"' && !inSingleQuote) { - inDoubleQuote = !inDoubleQuote; - i++; - } else if (ch === '(' && !inSingleQuote && !inDoubleQuote) { - depth++; - i++; - } else if (ch === ')' && !inSingleQuote && !inDoubleQuote) { - depth--; - i++; - } else { - i++; - } - } - - if (depth === 0) { - var pseudoArgs = selector.substring(argsStart, i - 1); - var fullMatch = selector.substring(pseudoStart, i); - - // Store match in same format as regex: [fullMatch, pseudoName, pseudoArgs, startIndex] - matches.push([fullMatch, pseudoName, pseudoArgs, pseudoStart]); - } - - // Move back one since loop will increment - i--; - } - } - } - - return matches; - } - - /** - * Parses a CSS selector string and splits it into parts, handling nested parentheses. - * - * This function is useful for splitting selectors that may contain nested function-like - * syntax (e.g., :not(.foo, .bar)), ensuring that commas inside parentheses do not split - * the selector. - * - * @param {string} selector - The CSS selector string to parse. - * @returns {string[]} An array of selector parts, split by top-level commas, with whitespace trimmed. - */ - function parseAndSplitNestedSelectors(selector) { - var depth = 0; // Track parenthesis nesting depth - var buffer = ""; // Accumulate characters for current selector part - var parts = []; // Array of split selector parts - var inSingleQuote = false; // Track if we're inside single quotes - var inDoubleQuote = false; // Track if we're inside double quotes - var i, char; - - for (i = 0; i < selector.length; i++) { - char = selector.charAt(i); - - // Handle escape sequences - skip them entirely - if (char === '\\' && i + 1 < selector.length) { - buffer += char; - i++; - buffer += selector.charAt(i); - continue; - } - - // Handle single quote strings - if (char === "'" && !inDoubleQuote) { - inSingleQuote = !inSingleQuote; - buffer += char; - } - // Handle double quote strings - else if (char === '"' && !inSingleQuote) { - inDoubleQuote = !inDoubleQuote; - buffer += char; - } - // Process characters outside of quoted strings - else if (!inSingleQuote && !inDoubleQuote) { - if (char === '(') { - // Entering a nested level (e.g., :is(...)) - depth++; - buffer += char; - } else if (char === ')') { - // Exiting a nested level - depth--; - buffer += char; - } else if (char === ',' && depth === 0) { - // Found a top-level comma separator - split here - // Note: escaped commas (\,) are already handled above - if (buffer.trim()) { - parts.push(buffer.trim()); - } - buffer = ""; - } else { - // Regular character - add to buffer - buffer += char; - } - } - // Characters inside quoted strings - add to buffer - else { - buffer += char; - } - } - - // Add any remaining content in buffer as the last part - var trimmed = buffer.trim(); - if (trimmed) { - // Preserve trailing space if selector ends with hex escape - var endsWithHexEscape = endsWithHexEscapeRegExp.test(buffer); - parts.push(endsWithHexEscape ? buffer.replace(leadingWhitespaceRegExp, '') : trimmed); - } - - return parts; - } - - /** - * Validates a CSS selector string, including handling of nested selectors within certain pseudo-classes. - * - * This function checks if the provided selector is valid according to the rules defined by - * `basicSelectorValidator`. For pseudo-classes that accept selector lists (such as :not, :is, :has, :where), - * it recursively validates each nested selector using the same validation logic. - * - * @param {string} selector - The CSS selector string to validate. - * @returns {boolean} Returns `true` if the selector is valid, otherwise `false`. - */ - - // Cache to store validated selectors (previously a ES6 Map, now an ES5-compliant object) - var validatedSelectorsCache = {}; - - // Only pseudo-classes that accept selector lists should recurse - var selectorListPseudoClasses = { - 'not': true, - 'is': true, - 'has': true, - 'where': true - }; - - function validateSelector(selector) { - if (validatedSelectorsCache.hasOwnProperty(selector)) { - return validatedSelectorsCache[selector]; - } - - // Use function-based parsing to extract pseudo-classes (avoids backtracking) - var pseudoClassMatches = extractPseudoClasses(selector); - - for (var j = 0; j < pseudoClassMatches.length; j++) { - var pseudoClass = pseudoClassMatches[j][1]; - if (selectorListPseudoClasses.hasOwnProperty(pseudoClass)) { - var nestedSelectors = parseAndSplitNestedSelectors(pseudoClassMatches[j][2]); - - // Check if ANY selector in the list contains & (nesting selector) - // If so, skip validation for the entire selector list since & will be replaced at runtime - var hasAmpersand = false; - for (var k = 0; k < nestedSelectors.length; k++) { - if (ampersandRegExp.test(nestedSelectors[k])) { - hasAmpersand = true; - break; - } - } - - // If any selector has &, skip validation for this entire pseudo-class - if (hasAmpersand) { - continue; - } - - // Otherwise, validate each selector normally - for (var i = 0; i < nestedSelectors.length; i++) { - var nestedSelector = nestedSelectors[i]; - if (!validatedSelectorsCache.hasOwnProperty(nestedSelector)) { - var nestedSelectorValidation = validateSelector(nestedSelector); - validatedSelectorsCache[nestedSelector] = nestedSelectorValidation; - if (!nestedSelectorValidation) { - validatedSelectorsCache[selector] = false; - return false; - } - } else if (!validatedSelectorsCache[nestedSelector]) { - validatedSelectorsCache[selector] = false; - return false; - } - } - } - } - - var basicSelectorValidation = basicSelectorValidator(selector); - validatedSelectorsCache[selector] = basicSelectorValidation; - - return basicSelectorValidation; - } - - /** - * Validates namespace selectors by checking if the namespace prefix is defined. - * - * @param {string} selector - The CSS selector to validate - * @returns {boolean} Returns true if the namespace is valid, false otherwise - */ - function validateNamespaceSelector(selector) { - // Check if selector contains a namespace prefix - // We need to ignore pipes inside attribute selectors - var pipeIndex = -1; - var inAttr = false; - var inSingleQuote = false; - var inDoubleQuote = false; - - for (var i = 0; i < selector.length; i++) { - var char = selector[i]; - - // Handle escape sequences - skip hex escapes or simple escapes - if (char === '\\') { - var escapeLen = getEscapeSequenceLength(selector, i); - if (escapeLen > 0) { - i += escapeLen - 1; // -1 because loop will increment - continue; - } - } - - if (inSingleQuote) { - if (char === "'") { - inSingleQuote = false; - } - } else if (inDoubleQuote) { - if (char === '"') { - inDoubleQuote = false; - } - } else if (inAttr) { - if (char === "]") { - inAttr = false; - } else if (char === "'") { - inSingleQuote = true; - } else if (char === '"') { - inDoubleQuote = true; - } - } else { - if (char === "[") { - inAttr = true; - } else if (char === "|" && !inAttr) { - // This is a namespace separator, not an attribute operator - pipeIndex = i; - break; - } - } - } - - if (pipeIndex === -1) { - return true; // No namespace, always valid - } - - var namespacePrefix = selector.substring(0, pipeIndex); - - // Universal namespace (*|) and default namespace (|) are always valid - if (namespacePrefix === '*' || namespacePrefix === '') { - return true; - } - - // Check if the custom namespace prefix is defined - return definedNamespacePrefixes.hasOwnProperty(namespacePrefix); - } - - /** - * Normalizes escape sequences in a selector to match browser behavior. - * Decodes escape sequences and re-encodes them in canonical form. - * - * @param {string} selector - The selector to normalize - * @returns {string} Normalized selector - */ - function normalizeSelectorEscapes(selector) { - var result = ''; - var i = 0; - var nextChar = ''; - - // Track context for identifier boundaries - var inIdentifier = false; - var inAttribute = false; - var attributeDepth = 0; - var needsEscapeForIdent = false; - var lastWasHexEscape = false; - - while (i < selector.length) { - var char = selector[i]; - - // Track attribute selector context - if (char === '[' && !inAttribute) { - inAttribute = true; - attributeDepth = 1; - result += char; - i++; - needsEscapeForIdent = false; - inIdentifier = false; - lastWasHexEscape = false; - continue; - } - - if (inAttribute) { - if (char === '[') attributeDepth++; - if (char === ']') { - attributeDepth--; - if (attributeDepth === 0) inAttribute = false; - } - // Don't normalize escapes inside attribute selectors - if (char === '\\' && i + 1 < selector.length) { - var escapeLen = getEscapeSequenceLength(selector, i); - result += selector.substr(i, escapeLen); - i += escapeLen; - } else { - result += char; - i++; - } - lastWasHexEscape = false; - continue; - } - - // Handle escape sequences - if (char === '\\') { - var escapeLen = getEscapeSequenceLength(selector, i); - if (escapeLen > 0) { - var escapeSeq = selector.substr(i, escapeLen); - var decoded = decodeEscapeSequence(escapeSeq); - var wasHexEscape = startsWithHexEscapeRegExp.test(escapeSeq); - var hadTerminatingSpace = wasHexEscape && escapeSeq[escapeLen - 1] === ' '; - nextChar = selector[i + escapeLen] || ''; - - // Check if this character needs escaping - var needsEscape = false; - var useHexEscape = false; - - if (needsEscapeForIdent) { - // At start of identifier (after . # or -) - // Digits must be escaped, letters/underscore/_/- don't need escaping - if (isDigit(decoded)) { - needsEscape = true; - useHexEscape = true; - } else if (decoded === '-') { - // Dash at identifier start: keep escaped if it's the only character, - // otherwise it can be decoded - var remainingSelector = selector.substring(i + escapeLen); - var hasMoreIdentChars = remainingSelector && identCharRegExp.test(remainingSelector[0]); - needsEscape = !hasMoreIdentChars; - } else if (!identStartCharRegExp.test(decoded)) { - needsEscape = true; - } - } else { - if (specialCharsNeedEscapeRegExp.test(decoded)) { - needsEscape = true; - } - } - - if (needsEscape) { - if (useHexEscape) { - // Use normalized hex escape - var codePoint = decoded.charCodeAt(0); - var hex = codePoint.toString(16); - result += '\\' + hex; - // Add space if next char could continue the hex sequence, - // or if at end of selector (to disambiguate the escape) - if (isHexDigit(nextChar) || !nextChar || afterHexEscapeSeparatorRegExp.test(nextChar)) { - result += ' '; - lastWasHexEscape = false; - } else { - lastWasHexEscape = true; - } - } else { - // Use simple character escape - result += '\\' + decoded; - lastWasHexEscape = false; - } - } else { - // No escape needed, use the character directly - // But if previous was hex escape (without terminating space) and this is alphanumeric, add space - if (lastWasHexEscape && !hadTerminatingSpace && isAlphanumeric(decoded)) { - result += ' '; - } - result += decoded; - // Preserve terminating space at end of selector (when followed by non-ident char) - if (hadTerminatingSpace && (!nextChar || afterHexEscapeSeparatorRegExp.test(nextChar))) { - result += ' '; - } - lastWasHexEscape = false; - } - - i += escapeLen; - // After processing escape, check if we're still needing ident validation - // Only stay in needsEscapeForIdent state if decoded was '-' - needsEscapeForIdent = needsEscapeForIdent && decoded === '-'; - inIdentifier = true; - continue; - } - } - - // Handle regular characters - if (char === '.' || char === '#') { - result += char; - needsEscapeForIdent = true; - inIdentifier = false; - lastWasHexEscape = false; - i++; - } else if (char === '-' && needsEscapeForIdent) { - // Dash after . or # - next char must be valid ident start or digit (which needs escaping) - result += char; - needsEscapeForIdent = true; - lastWasHexEscape = false; - i++; - } else if (isDigit(char) && needsEscapeForIdent) { - // Digit at identifier start must be hex escaped - var codePoint = char.charCodeAt(0); - var hex = codePoint.toString(16); - result += '\\' + hex; - nextChar = selector[i + 1] || ''; - // Add space if next char could continue the hex sequence, - // or if at end of selector (to disambiguate the escape) - if (isHexDigit(nextChar) || !nextChar || afterHexEscapeSeparatorRegExp.test(nextChar)) { - result += ' '; - lastWasHexEscape = false; - } else { - lastWasHexEscape = true; - } - needsEscapeForIdent = false; - inIdentifier = true; - i++; - } else if (char === ':' || combinatorOrSeparatorRegExp.test(char)) { - // Combinators, separators, and pseudo-class markers reset identifier state - // Preserve trailing space from hex escape - if (!(char === ' ' && lastWasHexEscape && result[result.length - 1] === ' ')) { - result += char; - } - needsEscapeForIdent = false; - inIdentifier = false; - lastWasHexEscape = false; - i++; - } else if (isLetter(char) && lastWasHexEscape) { - // Letter after hex escape needs a space separator - result += ' ' + char; - needsEscapeForIdent = false; - inIdentifier = true; - lastWasHexEscape = false; - i++; - } else if (char === ' ' && lastWasHexEscape) { - // Trailing space - keep it if at end or before non-ident char - nextChar = selector[i + 1] || ''; - if (!nextChar || trailingSpaceSeparatorRegExp.test(nextChar)) { - result += char; - } - needsEscapeForIdent = false; - inIdentifier = false; - lastWasHexEscape = false; - i++; - } else { - result += char; - needsEscapeForIdent = false; - inIdentifier = true; - lastWasHexEscape = false; - i++; - } - } - - return result; - } - - /** - * Helper function to decode all escape sequences in a string. - * - * @param {string} str - The string to decode - * @returns {string} The decoded string - */ - function decodeEscapeSequencesInString(str) { - var result = ''; - for (var i = 0; i < str.length; i++) { - if (str[i] === '\\' && i + 1 < str.length) { - // Get the escape sequence length - var escapeLen = getEscapeSequenceLength(str, i); - if (escapeLen > 0) { - var escapeSeq = str.substr(i, escapeLen); - var decoded = decodeEscapeSequence(escapeSeq); - result += decoded; - i += escapeLen - 1; // -1 because loop will increment - continue; - } - } - result += str[i]; - } - return result; - } - - /** - * Decodes a CSS escape sequence to its character value. - * - * @param {string} escapeSeq - The escape sequence (including backslash) - * @returns {string} The decoded character - */ - function decodeEscapeSequence(escapeSeq) { - if (escapeSeq.length < 2 || escapeSeq[0] !== '\\') { - return escapeSeq; - } - - var content = escapeSeq.substring(1); - - // Check if it's a hex escape - var hexMatch = content.match(hexEscapeSequenceRegExp); - if (hexMatch) { - var codePoint = parseInt(hexMatch[1], 16); - // Handle surrogate pairs for code points > 0xFFFF - if (codePoint > 0xFFFF) { - // Convert to surrogate pair - codePoint -= 0x10000; - var high = 0xD800 + (codePoint >> 10); - var low = 0xDC00 + (codePoint & 0x3FF); - return String.fromCharCode(high, low); - } - return String.fromCharCode(codePoint); - } - - // Simple escape - return the character after backslash - return content[0] || ''; - } - - /** - * Normalizes attribute selectors by ensuring values are properly quoted with double quotes. - * Examples: - * [attr=value] -> [attr="value"] - * [attr="value"] -> [attr="value"] (unchanged) - * [attr='value'] -> [attr="value"] (converted to double quotes) - * - * @param {string} selector - The selector to normalize - * @returns {string|null} Normalized selector, or null if invalid - */ - function normalizeAttributeSelectors(selector) { - var result = ''; - var i = 0; - - while (i < selector.length) { - // Look for attribute selector start - if (selector[i] === '[') { - result += '['; - i++; - - var attrContent = ''; - var depth = 1; - - // Find the closing bracket, handling nested brackets and escapes - while (i < selector.length && depth > 0) { - if (selector[i] === '\\' && i + 1 < selector.length) { - attrContent += selector.substring(i, i + 2); - i += 2; - continue; - } - if (selector[i] === '[') depth++; - if (selector[i] === ']') { - depth--; - if (depth === 0) break; - } - attrContent += selector[i]; - i++; - } - - // Normalize the attribute content - var normalized = normalizeAttributeContent(attrContent); - if (normalized === null) { - // Invalid attribute selector (e.g., unclosed quote) - return null; - } - result += normalized; - if (i < selector.length && selector[i] === ']') { - result += ']'; - i++; - } - } else { - result += selector[i]; - i++; - } - } - - return result; - } - - /** - * Processes a quoted attribute value by checking for proper closure and decoding escape sequences. - * @param {string} trimmedValue - The quoted value (with quotes) - * @param {string} quoteChar - The quote character ('"' or "'") - * @param {string} attrName - The attribute name - * @param {string} operator - The attribute operator - * @param {string} flag - Optional case-sensitivity flag - * @returns {string|null} Normalized attribute content, or null if invalid - */ - function processQuotedAttributeValue(trimmedValue, quoteChar, attrName, operator, flag) { - // Check if the closing quote is properly closed (not escaped) - if (trimmedValue.length < 2) { - return null; // Too short - } - // Find the actual closing quote (not escaped) - var i = 1; - var foundClose = false; - while (i < trimmedValue.length) { - if (trimmedValue[i] === '\\' && i + 1 < trimmedValue.length) { - // Skip escape sequence - var escapeLen = getEscapeSequenceLength(trimmedValue, i); - i += escapeLen; - continue; - } - if (trimmedValue[i] === quoteChar) { - // Found closing quote - foundClose = (i === trimmedValue.length - 1); - break; - } - i++; - } - if (!foundClose) { - return null; // Unclosed quote - invalid - } - // Extract inner value and decode escape sequences - var innerValue = trimmedValue.slice(1, -1); - var decodedValue = decodeEscapeSequencesInString(innerValue); - // If decoded value contains quotes, we need to escape them - var escapedValue = decodedValue.replace(doubleQuoteRegExp, '\\"'); - return attrName + operator + '"' + escapedValue + '"' + (flag ? ' ' + flag : ''); - } - - /** - * Normalizes the content inside an attribute selector. - * @param {string} content - The content between [ and ] - * @returns {string} Normalized content, or null if invalid - */ - function normalizeAttributeContent(content) { - // Match: attribute-name [operator] [value] [flag] - var match = content.match(attributeSelectorContentRegExp); - - if (!match) { - // No operator (e.g., [disabled]) or malformed - return as is - return content; - } - - var attrName = match[1]; - var operator = match[2]; - var valueAndFlag = match[3].trim(); // Trim here instead of in regex - - // Check if there's a case-sensitivity flag (i or s) at the end - var flagMatch = valueAndFlag.match(attributeCaseFlagRegExp); - var value = flagMatch ? flagMatch[1] : valueAndFlag; - var flag = flagMatch ? flagMatch[2] : ''; - - // Check for unclosed quotes - this makes the selector invalid - var trimmedValue = value.trim(); - var firstChar = trimmedValue[0]; - - if (firstChar === '"') { - return processQuotedAttributeValue(trimmedValue, '"', attrName, operator, flag); - } - - if (firstChar === "'") { - return processQuotedAttributeValue(trimmedValue, "'", attrName, operator, flag); - } - - // Check for unescaped special characters in unquoted values - // Escaped special characters are valid (e.g., \` is valid, but ` is not) - var hasUnescapedSpecialChar = false; - for (var i = 0; i < trimmedValue.length; i++) { - var char = trimmedValue[i]; - if (char === '\\' && i + 1 < trimmedValue.length) { - // Skip the entire escape sequence - var escapeLen = getEscapeSequenceLength(trimmedValue, i); - if (escapeLen > 0) { - i += escapeLen - 1; // -1 because loop will increment - continue; - } - } - // Check if this is an unescaped special character - if (specialCharsNeedEscapeRegExp.test(char)) { - hasUnescapedSpecialChar = true; - break; - } - } - - if (hasUnescapedSpecialChar) { - return null; // Unescaped special characters not allowed in unquoted attribute values - } - - // Decode escape sequences in the value before quoting - // Inside quotes, special characters don't need escaping - var decodedValue = decodeEscapeSequencesInString(trimmedValue); - - // If the decoded value contains double quotes, escape them for the output - // (since we're using double quotes as delimiters) - var escapedValue = decodedValue.replace(backslashRegExp, '\\\\').replace(doubleQuoteRegExp, '\\"'); - - // Unquoted value - add double quotes with decoded and re-escaped content - return attrName + operator + '"' + escapedValue + '"' + (flag ? ' ' + flag : ''); - } - - /** - * Processes a CSS selector text - * - * @param {string} selectorText - The CSS selector text to process - * @returns {string} The processed selector text with normalized whitespace and invalid selectors removed - */ - function processSelectorText(selectorText) { - // Normalize whitespace first - var normalized = selectorText.replace(whitespaceNormalizationRegExp, function (match, _, newline) { - if (newline) return " "; - return match; - }); - - // Normalize escape sequences to match browser behavior - normalized = normalizeSelectorEscapes(normalized); - - // Normalize attribute selectors (add quotes to unquoted values) - // Returns null if invalid (e.g., unclosed quotes) - normalized = normalizeAttributeSelectors(normalized); - if (normalized === null) { - return ''; // Invalid selector - return empty to trigger validation failure - } - - // Recursively process pseudo-classes to handle nesting - return processNestedPseudoClasses(normalized); - } - - /** - * Recursively processes pseudo-classes to filter invalid selectors - * - * @param {string} selectorText - The CSS selector text to process - * @param {number} depth - Current recursion depth (to prevent infinite loops) - * @returns {string} The processed selector text with invalid selectors removed - */ - function processNestedPseudoClasses(selectorText, depth) { - // Prevent infinite recursion - if (typeof depth === 'undefined') { - depth = 0; - } - if (depth > 10) { - return selectorText; - } - - var pseudoClassMatches = extractPseudoClasses(selectorText); - - // If no pseudo-classes found, return as-is - if (pseudoClassMatches.length === 0) { - return selectorText; - } - - // Build result by processing matches from right to left (to preserve positions) - var result = selectorText; - - for (var j = pseudoClassMatches.length - 1; j >= 0; j--) { - var pseudoClass = pseudoClassMatches[j][1]; - if (selectorListPseudoClasses.hasOwnProperty(pseudoClass)) { - var fullMatch = pseudoClassMatches[j][0]; - var pseudoArgs = pseudoClassMatches[j][2]; - var matchStart = pseudoClassMatches[j][3]; - - // Check if ANY selector contains & BEFORE processing - var nestedSelectorsRaw = parseAndSplitNestedSelectors(pseudoArgs); - var hasAmpersand = false; - for (var k = 0; k < nestedSelectorsRaw.length; k++) { - if (ampersandRegExp.test(nestedSelectorsRaw[k])) { - hasAmpersand = true; - break; - } - } - - // If & is present, skip all processing (keep everything unchanged) - if (hasAmpersand) { - continue; - } - - // Recursively process the arguments - var processedArgs = processNestedPseudoClasses(pseudoArgs, depth + 1); - var nestedSelectors = parseAndSplitNestedSelectors(processedArgs); - - // Filter out invalid selectors - var validSelectors = []; - for (var i = 0; i < nestedSelectors.length; i++) { - var nestedSelector = nestedSelectors[i]; - if (basicSelectorValidator(nestedSelector)) { - validSelectors.push(nestedSelector); - } - } - - // Reconstruct the pseudo-class with only valid selectors - var newArgs = validSelectors.join(', '); - var newPseudoClass = ':' + pseudoClass + '(' + newArgs + ')'; - - // Replace in the result string using position (processing right to left preserves positions) - result = result.substring(0, matchStart) + newPseudoClass + result.substring(matchStart + fullMatch.length); - } - } - - return result; - - return normalized; - } - - /** - * Checks if a selector contains newlines inside quoted strings. - * Uses iterative parsing to avoid regex backtracking issues. - * @param {string} selectorText - The selector to check - * @returns {boolean} True if newlines found inside quotes - */ - function hasNewlineInQuotedString(selectorText) { - for (var i = 0; i < selectorText.length; i++) { - var char = selectorText[i]; - - // Start of single-quoted string - if (char === "'") { - i++; - while (i < selectorText.length) { - if (selectorText[i] === '\\' && i + 1 < selectorText.length) { - // Skip escape sequence - i += 2; - continue; - } - if (selectorText[i] === "'") { - // End of string - break; - } - if (selectorText[i] === '\r' || selectorText[i] === '\n') { - return true; - } - i++; - } - } - // Start of double-quoted string - else if (char === '"') { - i++; - while (i < selectorText.length) { - if (selectorText[i] === '\\' && i + 1 < selectorText.length) { - // Skip escape sequence - i += 2; - continue; - } - if (selectorText[i] === '"') { - // End of string - break; - } - if (selectorText[i] === '\r' || selectorText[i] === '\n') { - return true; - } - i++; - } - } - } - return false; - } - - /** - * Checks if a given CSS selector text is valid by splitting it by commas - * and validating each individual selector using the `validateSelector` function. - * - * @param {string} selectorText - The CSS selector text to validate. Can contain multiple selectors separated by commas. - * @returns {boolean} Returns true if all selectors are valid, otherwise false. - */ - function isValidSelectorText(selectorText) { - // TODO: The same validations here needs to be reused in CSSStyleRule.selectorText setter - // TODO: Move these validation logic to a shared function to be reused in CSSStyleRule.selectorText setter - - // Check for empty or whitespace-only selector - if (!selectorText || selectorText.trim() === '') { - return false; - } - - // Check for empty selector lists in pseudo-classes (e.g., :is(), :not(), :where(), :has()) - // These are invalid after filtering out invalid selectors - if (emptyPseudoClassRegExp.test(selectorText)) { - return false; - } - - // Check for newlines inside single or double quotes - // Uses helper function to avoid regex security issues - if (hasNewlineInQuotedString(selectorText)) { - return false; - } - - // Split selectorText by commas and validate each part - var selectors = parseAndSplitNestedSelectors(selectorText); - for (var i = 0; i < selectors.length; i++) { - var selector = selectors[i].trim(); - if (!validateSelector(selector) || !validateNamespaceSelector(selector)) { - return false; - } - } - return true; - } - - function pushToAncestorRules(rule) { - ancestorRules.push(rule); - } - - function parseError(message, isNested) { - var lines = token.substring(0, i).split('\n'); - var lineCount = lines.length; - var charCount = lines.pop().length + 1; - var error = new Error(message + ' (line ' + lineCount + ', char ' + charCount + ')'); - error.line = lineCount; - /* jshint sub : true */ - error['char'] = charCount; - error.styleSheet = styleSheet; - error.isNested = !!isNested; - // Print the error but continue parsing the sheet - try { - throw error; - } catch (e) { - errorHandler && errorHandler(e); - } - }; - - /** - * Handles invalid selectors with unmatched quotes by skipping the entire rule block. - * @param {string} nextState - The parser state to transition to after skipping - */ - function handleUnmatchedQuoteInSelector(nextState) { - // parseError('Invalid selector with unmatched quote: ' + buffer.trim()); - // Skip this entire invalid rule including its block - var ruleClosingMatch = token.slice(i).match(forwardRuleClosingBraceRegExp); - if (ruleClosingMatch) { - i += ruleClosingMatch.index + ruleClosingMatch[0].length - 1; - } - styleRule = null; - buffer = ""; - hasUnmatchedQuoteInSelector = false; // Reset flag - state = nextState; - } - - // Helper functions to check character types - function isSelectorStartChar(char) { - return '.:#&*['.indexOf(char) !== -1; - } - - function isWhitespaceChar(char) { - return ' \t\n\r'.indexOf(char) !== -1; - } - - // Helper functions for character type checking (faster than regex for single chars) - function isDigit(char) { - var code = char.charCodeAt(0); - return code >= 0x0030 && code <= 0x0039; // 0-9 - } - - function isHexDigit(char) { - if (!char) return false; - var code = char.charCodeAt(0); - return (code >= 0x0030 && code <= 0x0039) || // 0-9 - (code >= 0x0041 && code <= 0x0046) || // A-F - (code >= 0x0061 && code <= 0x0066); // a-f - } - - function isLetter(char) { - if (!char) return false; - var code = char.charCodeAt(0); - return (code >= 0x0041 && code <= 0x005A) || // A-Z - (code >= 0x0061 && code <= 0x007A); // a-z - } - - function isAlphanumeric(char) { - var code = char.charCodeAt(0); - return (code >= 0x0030 && code <= 0x0039) || // 0-9 - (code >= 0x0041 && code <= 0x005A) || // A-Z - (code >= 0x0061 && code <= 0x007A); // a-z - } - - /** - * Get the length of an escape sequence starting at the given position. - * CSS escape sequences are: - * - Backslash followed by 1-6 hex digits, optionally followed by a whitespace (consumed) - * - Backslash followed by any non-hex character - * @param {string} str - The string to check - * @param {number} pos - Position of the backslash - * @returns {number} Number of characters in the escape sequence (including backslash) - */ - function getEscapeSequenceLength(str, pos) { - if (str[pos] !== '\\' || pos + 1 >= str.length) { - return 0; - } - - var nextChar = str[pos + 1]; - - // Check if it's a hex escape - if (isHexDigit(nextChar)) { - var hexLength = 1; - // Count up to 6 hex digits - while (hexLength < 6 && pos + 1 + hexLength < str.length && isHexDigit(str[pos + 1 + hexLength])) { - hexLength++; - } - // Check if followed by optional whitespace (which gets consumed) - if (pos + 1 + hexLength < str.length && isWhitespaceChar(str[pos + 1 + hexLength])) { - return 1 + hexLength + 1; // backslash + hex digits + whitespace - } - return 1 + hexLength; // backslash + hex digits - } - - // Simple escape: backslash + any character - return 2; - } - - /** - * Check if a string contains an unescaped occurrence of a specific character - * @param {string} str - The string to search - * @param {string} char - The character to look for - * @returns {boolean} True if the character appears unescaped - */ - function containsUnescaped(str, char) { - for (var i = 0; i < str.length; i++) { - if (str[i] === '\\') { - var escapeLen = getEscapeSequenceLength(str, i); - if (escapeLen > 0) { - i += escapeLen - 1; // -1 because loop will increment - continue; - } - } - if (str[i] === char) { - return true; - } - } - return false; - } - - var endingIndex = token.length - 1; - var initialEndingIndex = endingIndex; - - for (var character; (character = token.charAt(i)); i++) { - if (i === endingIndex) { - switch (state) { - case "importRule": - case "namespaceRule": - case "layerBlock": - if (character !== ";") { - token += ";"; - endingIndex += 1; - } - break; - case "value": - if (character !== "}") { - if (character === ";") { - token += "}" - } else { - token += ";"; - } - endingIndex += 1; - break; - } - case "name": - case "before-name": - if (character === "}") { - token += " " - } else { - token += "}" - } - endingIndex += 1 - break; - case "before-selector": - if (character !== "}" && currentScope !== styleSheet) { - token += "}" - endingIndex += 1 - break; - } - } - } - - // Handle escape sequences before processing special characters - // CSS escape sequences: \HHHHHH (1-6 hex digits) optionally followed by whitespace, or \ + any char - if (character === '\\' && i + 1 < token.length) { - var escapeLen = getEscapeSequenceLength(token, i); - if (escapeLen > 0) { - buffer += token.substr(i, escapeLen); - i += escapeLen - 1; // -1 because loop will increment - continue; - } - } - - switch (character) { - - case " ": - case "\t": - case "\r": - case "\n": - case "\f": - if (SIGNIFICANT_WHITESPACE[state]) { - buffer += character; - } - break; - - // String - case '"': - index = i + 1; - do { - index = token.indexOf('"', index) + 1; - if (!index) { - parseError('Unmatched "'); - // If we're parsing a selector, flag it as invalid - if (state === "selector" || state === "atRule") { - hasUnmatchedQuoteInSelector = true; - } - } - } while (token[index - 2] === '\\'); - if (index === 0) { - break; - } - buffer += token.slice(i, index); - i = index - 1; - switch (state) { - case 'before-value': - state = 'value'; - break; - case 'importRule-begin': - state = 'importRule'; - if (i === endingIndex) { - token += ';' - } - break; - case 'namespaceRule-begin': - state = 'namespaceRule'; - if (i === endingIndex) { - token += ';' - } - break; - } - break; - - case "'": - index = i + 1; - do { - index = token.indexOf("'", index) + 1; - if (!index) { - parseError("Unmatched '"); - // If we're parsing a selector, flag it as invalid - if (state === "selector" || state === "atRule") { - hasUnmatchedQuoteInSelector = true; - } - } - } while (token[index - 2] === '\\'); - if (index === 0) { - break; - } - buffer += token.slice(i, index); - i = index - 1; - switch (state) { - case 'before-value': - state = 'value'; - break; - case 'importRule-begin': - state = 'importRule'; - break; - case 'namespaceRule-begin': - state = 'namespaceRule'; - break; - } - break; - - // Comment - case "/": - if (token.charAt(i + 1) === "*") { - i += 2; - index = token.indexOf("*/", i); - if (index === -1) { - i = token.length - 1; - buffer = ""; - } else { - i = index + 1; - } - } else { - buffer += character; - } - if (state === "importRule-begin") { - buffer += " "; - state = "importRule"; - } - if (state === "namespaceRule-begin") { - buffer += " "; - state = "namespaceRule"; - } - break; - - // At-rule - case "@": - if (nestedSelectorRule) { - if (styleRule && styleRule.constructor.name === "CSSNestedDeclarations") { - currentScope.cssRules.push(styleRule); - } - // Only reset styleRule to parent if styleRule is not the nestedSelectorRule itself - // This preserves nested selectors when followed immediately by @-rules - if (styleRule !== nestedSelectorRule && nestedSelectorRule.parentRule && nestedSelectorRule.parentRule.constructor.name === "CSSStyleRule") { - styleRule = nestedSelectorRule.parentRule; - } - // Don't reset nestedSelectorRule here - preserve it through @-rules - } - if (token.indexOf("@-moz-document", i) === i) { - validateAtRule("@-moz-document", function () { - state = "documentRule-begin"; - documentRule = new CSSOM.CSSDocumentRule(); - documentRule.__starts = i; - i += "-moz-document".length; - }); - buffer = ""; - break; - } else if (token.indexOf("@media", i) === i) { - validateAtRule("@media", function () { - state = "atBlock"; - mediaRule = new CSSOM.CSSMediaRule(); - mediaRule.__starts = i; - i += "media".length; - }); - buffer = ""; - break; - } else if (token.indexOf("@container", i) === i) { - validateAtRule("@container", function () { - state = "containerBlock"; - containerRule = new CSSOM.CSSContainerRule(); - containerRule.__starts = i; - i += "container".length; - }); - buffer = ""; - break; - } else if (token.indexOf("@counter-style", i) === i) { - buffer = ""; - // @counter-style can be nested only inside CSSScopeRule or CSSConditionRule - // and only if there's no CSSStyleRule in the parent chain - var cannotBeNested = !canAtRuleBeNested(); - validateAtRule("@counter-style", function () { - state = "counterStyleBlock" - counterStyleRule = new CSSOM.CSSCounterStyleRule(); - counterStyleRule.__starts = i; - i += "counter-style".length; - }, cannotBeNested); - break; - } else if (token.indexOf("@property", i) === i) { - buffer = ""; - // @property can be nested only inside CSSScopeRule or CSSConditionRule - // and only if there's no CSSStyleRule in the parent chain - var cannotBeNested = !canAtRuleBeNested(); - validateAtRule("@property", function () { - state = "propertyBlock" - propertyRule = new CSSOM.CSSPropertyRule(); - propertyRule.__starts = i; - i += "property".length; - }, cannotBeNested); - break; - } else if (token.indexOf("@scope", i) === i) { - validateAtRule("@scope", function () { - state = "scopeBlock"; - scopeRule = new CSSOM.CSSScopeRule(); - scopeRule.__starts = i; - i += "scope".length; - }); - buffer = ""; - break; - } else if (token.indexOf("@layer", i) === i) { - validateAtRule("@layer", function () { - state = "layerBlock" - layerBlockRule = new CSSOM.CSSLayerBlockRule(); - layerBlockRule.__starts = i; - i += "layer".length; - }); - buffer = ""; - break; - } else if (token.indexOf("@page", i) === i) { - validateAtRule("@page", function () { - state = "pageBlock" - pageRule = new CSSOM.CSSPageRule(); - pageRule.__starts = i; - i += "page".length; - }); - buffer = ""; - break; - } else if (token.indexOf("@supports", i) === i) { - validateAtRule("@supports", function () { - state = "conditionBlock"; - supportsRule = new CSSOM.CSSSupportsRule(); - supportsRule.__starts = i; - i += "supports".length; - }); - buffer = ""; - break; - } else if (token.indexOf("@host", i) === i) { - validateAtRule("@host", function () { - state = "hostRule-begin"; - i += "host".length; - hostRule = new CSSOM.CSSHostRule(); - hostRule.__starts = i; - }); - buffer = ""; - break; - } else if (token.indexOf("@starting-style", i) === i) { - validateAtRule("@starting-style", function () { - state = "startingStyleRule-begin"; - i += "starting-style".length; - startingStyleRule = new CSSOM.CSSStartingStyleRule(); - startingStyleRule.__starts = i; - }); - buffer = ""; - break; - } else if (token.indexOf("@import", i) === i) { - buffer = ""; - validateAtRule("@import", function () { - state = "importRule-begin"; - i += "import".length; - buffer += "@import"; - }, true); - break; - } else if (token.indexOf("@namespace", i) === i) { - buffer = ""; - validateAtRule("@namespace", function () { - state = "namespaceRule-begin"; - i += "namespace".length; - buffer += "@namespace"; - }, true); - break; - } else if (token.indexOf("@font-face", i) === i) { - buffer = ""; - // @font-face can be nested only inside CSSScopeRule or CSSConditionRule - // and only if there's no CSSStyleRule in the parent chain - var cannotBeNested = !canAtRuleBeNested(); - validateAtRule("@font-face", function () { - state = "fontFaceRule-begin"; - i += "font-face".length; - fontFaceRule = new CSSOM.CSSFontFaceRule(); - fontFaceRule.__starts = i; - }, cannotBeNested); - break; - } else { - // Reset lastIndex before using global regex (shared instance) - atKeyframesRegExp.lastIndex = i; - var matchKeyframes = atKeyframesRegExp.exec(token); - if (matchKeyframes && matchKeyframes.index === i) { - state = "keyframesRule-begin"; - keyframesRule = new CSSOM.CSSKeyframesRule(); - keyframesRule.__starts = i; - keyframesRule._vendorPrefix = matchKeyframes[1]; // Will come out as undefined if no prefix was found - i += matchKeyframes[0].length - 1; - buffer = ""; - break; - } else if (state === "selector") { - state = "atRule"; - } - } - buffer += character; - break; - - case "{": - if (currentScope === topScope) { - nestedSelectorRule = null; - } - if (state === 'before-selector') { - parseError("Unexpected {"); - i = ignoreBalancedBlock(i, token.slice(i)); - break; - } - if (state === "selector" || state === "atRule") { - if (!nestedSelectorRule && containsUnescaped(buffer, ";")) { - var ruleClosingMatch = token.slice(i).match(forwardRuleClosingBraceRegExp); - if (ruleClosingMatch) { - styleRule = null; - buffer = ""; - state = "before-selector"; - i += ruleClosingMatch.index + ruleClosingMatch[0].length; - break; - } - } - - // Ensure styleRule exists before trying to set properties on it - if (!styleRule) { - styleRule = new CSSOM.CSSStyleRule(); - styleRule.__starts = i; - } - - // Check if tokenizer detected an unmatched quote BEFORE setting up the rule - if (hasUnmatchedQuoteInSelector) { - handleUnmatchedQuoteInSelector("before-selector"); - break; - } - - var originalParentRule = parentRule; - - if (parentRule) { - styleRule.__parentRule = parentRule; - pushToAncestorRules(parentRule); - } - - currentScope = parentRule = styleRule; - - var processedSelectorText = processSelectorText(buffer.trim()); - // In a nested selector, ensure each selector contains '&' at the beginning, except for selectors that already have '&' somewhere - if (originalParentRule && originalParentRule.constructor.name === "CSSStyleRule") { - styleRule.selectorText = parseAndSplitNestedSelectors(processedSelectorText).map(function (sel) { - // Add & at the beginning if there's no & in the selector, or if it starts with a combinator - return (sel.indexOf('&') === -1 || startsWithCombinatorRegExp.test(sel)) ? '& ' + sel : sel; - }).join(', '); - } else { - // Normalize comma spacing: split by commas and rejoin with ", " - styleRule.selectorText = parseAndSplitNestedSelectors(processedSelectorText).join(', '); - } - styleRule.style.__starts = i; - styleRule.__parentStyleSheet = styleSheet; - buffer = ""; - state = "before-name"; - } else if (state === "atBlock") { - mediaRule.media.mediaText = buffer.trim(); - - if (parentRule) { - mediaRule.__parentRule = parentRule; - pushToAncestorRules(parentRule); - // If entering @media from within a CSSStyleRule, set nestedSelectorRule - // so that & selectors and declarations work correctly inside - if (parentRule.constructor.name === "CSSStyleRule" && !nestedSelectorRule) { - nestedSelectorRule = parentRule; - } - } - - currentScope = parentRule = mediaRule; - pushToAncestorRules(mediaRule); - mediaRule.__parentStyleSheet = styleSheet; - - // Don't reset styleRule to null if it's a nested CSSStyleRule that will contain this @-rule - if (!styleRule || styleRule.constructor.name !== "CSSStyleRule" || !styleRule.__parentRule) { - styleRule = null; // Reset styleRule when entering @-rule - } - - buffer = ""; - state = "before-selector"; - } else if (state === "containerBlock") { - containerRule.__conditionText = buffer.trim(); - - if (parentRule) { - containerRule.__parentRule = parentRule; - pushToAncestorRules(parentRule); - if (parentRule.constructor.name === "CSSStyleRule" && !nestedSelectorRule) { - nestedSelectorRule = parentRule; - } - } - currentScope = parentRule = containerRule; - pushToAncestorRules(containerRule); - containerRule.__parentStyleSheet = styleSheet; - styleRule = null; // Reset styleRule when entering @-rule - buffer = ""; - state = "before-selector"; - } else if (state === "counterStyleBlock") { - var counterStyleName = buffer.trim().replace(newlineRemovalRegExp, ""); - // Validate: name cannot be empty, contain whitespace, or contain dots - var isValidCounterStyleName = counterStyleName.length > 0 && !whitespaceAndDotRegExp.test(counterStyleName); - - if (isValidCounterStyleName) { - counterStyleRule.name = counterStyleName; - if (parentRule) { - counterStyleRule.__parentRule = parentRule; - } - counterStyleRule.__parentStyleSheet = styleSheet; - styleRule = counterStyleRule; - } - buffer = ""; - } else if (state === "propertyBlock") { - var propertyName = buffer.trim().replace(newlineRemovalRegExp, ""); - // Validate: name must start with -- (custom property) - var isValidPropertyName = propertyName.indexOf("--") === 0; - - if (isValidPropertyName) { - propertyRule.__name = propertyName; - if (parentRule) { - propertyRule.__parentRule = parentRule; - } - propertyRule.__parentStyleSheet = styleSheet; - styleRule = propertyRule; - } - buffer = ""; - } else if (state === "conditionBlock") { - supportsRule.__conditionText = buffer.trim(); - - if (parentRule) { - supportsRule.__parentRule = parentRule; - pushToAncestorRules(parentRule); - if (parentRule.constructor.name === "CSSStyleRule" && !nestedSelectorRule) { - nestedSelectorRule = parentRule; - } - } - - currentScope = parentRule = supportsRule; - pushToAncestorRules(supportsRule); - supportsRule.__parentStyleSheet = styleSheet; - styleRule = null; // Reset styleRule when entering @-rule - buffer = ""; - state = "before-selector"; - } else if (state === "scopeBlock") { - var parsedScopePrelude = parseScopePrelude(buffer.trim()); - - if (parsedScopePrelude.hasStart) { - scopeRule.__start = parsedScopePrelude.startSelector; - } - if (parsedScopePrelude.hasEnd) { - scopeRule.__end = parsedScopePrelude.endSelector; - } - if (parsedScopePrelude.hasOnlyEnd) { - scopeRule.__end = parsedScopePrelude.endSelector; - } - - if (parentRule) { - scopeRule.__parentRule = parentRule; - pushToAncestorRules(parentRule); - if (parentRule.constructor.name === "CSSStyleRule" && !nestedSelectorRule) { - nestedSelectorRule = parentRule; - } - } - currentScope = parentRule = scopeRule; - pushToAncestorRules(scopeRule); - scopeRule.__parentStyleSheet = styleSheet; - styleRule = null; // Reset styleRule when entering @-rule - buffer = ""; - state = "before-selector"; - } else if (state === "layerBlock") { - layerBlockRule.name = buffer.trim(); - - var isValidName = layerBlockRule.name.length === 0 || layerBlockRule.name.match(cssCustomIdentifierRegExp) !== null; - - if (isValidName) { - if (parentRule) { - layerBlockRule.__parentRule = parentRule; - pushToAncestorRules(parentRule); - if (parentRule.constructor.name === "CSSStyleRule" && !nestedSelectorRule) { - nestedSelectorRule = parentRule; - } - } - - currentScope = parentRule = layerBlockRule; - pushToAncestorRules(layerBlockRule); - layerBlockRule.__parentStyleSheet = styleSheet; - } - styleRule = null; // Reset styleRule when entering @-rule - buffer = ""; - state = "before-selector"; - } else if (state === "pageBlock") { - pageRule.selectorText = buffer.trim(); - - if (parentRule) { - pageRule.__parentRule = parentRule; - pushToAncestorRules(parentRule); - } - - currentScope = parentRule = pageRule; - pageRule.__parentStyleSheet = styleSheet; - styleRule = pageRule; - buffer = ""; - state = "before-name"; - } else if (state === "hostRule-begin") { - if (parentRule) { - pushToAncestorRules(parentRule); - } - - currentScope = parentRule = hostRule; - pushToAncestorRules(hostRule); - hostRule.__parentStyleSheet = styleSheet; - buffer = ""; - state = "before-selector"; - } else if (state === "startingStyleRule-begin") { - if (parentRule) { - startingStyleRule.__parentRule = parentRule; - pushToAncestorRules(parentRule); - if (parentRule.constructor.name === "CSSStyleRule" && !nestedSelectorRule) { - nestedSelectorRule = parentRule; - } - } - - currentScope = parentRule = startingStyleRule; - pushToAncestorRules(startingStyleRule); - startingStyleRule.__parentStyleSheet = styleSheet; - styleRule = null; // Reset styleRule when entering @-rule - buffer = ""; - state = "before-selector"; - - } else if (state === "fontFaceRule-begin") { - if (parentRule) { - fontFaceRule.__parentRule = parentRule; - } - fontFaceRule.__parentStyleSheet = styleSheet; - styleRule = fontFaceRule; - buffer = ""; - state = "before-name"; - } else if (state === "keyframesRule-begin") { - keyframesRule.name = buffer.trim(); - if (parentRule) { - pushToAncestorRules(parentRule); - keyframesRule.__parentRule = parentRule; - } - keyframesRule.__parentStyleSheet = styleSheet; - currentScope = parentRule = keyframesRule; - buffer = ""; - state = "keyframeRule-begin"; - } else if (state === "keyframeRule-begin") { - styleRule = new CSSOM.CSSKeyframeRule(); - styleRule.keyText = buffer.trim(); - styleRule.__starts = i; - buffer = ""; - state = "before-name"; - } else if (state === "documentRule-begin") { - // FIXME: what if this '{' is in the url text of the match function? - documentRule.matcher.matcherText = buffer.trim(); - if (parentRule) { - pushToAncestorRules(parentRule); - documentRule.__parentRule = parentRule; - } - currentScope = parentRule = documentRule; - pushToAncestorRules(documentRule); - documentRule.__parentStyleSheet = styleSheet; - buffer = ""; - state = "before-selector"; - } else if (state === "before-name" || state === "name") { - // @font-face and similar rules don't support nested selectors - // If we encounter a nested selector block inside them, skip it - if (styleRule.constructor.name === "CSSFontFaceRule" || - styleRule.constructor.name === "CSSKeyframeRule" || - (styleRule.constructor.name === "CSSPageRule" && parentRule === styleRule)) { - // Skip the nested block - var ruleClosingMatch = token.slice(i).match(forwardRuleClosingBraceRegExp); - if (ruleClosingMatch) { - i += ruleClosingMatch.index + ruleClosingMatch[0].length - 1; - buffer = ""; - state = "before-name"; - break; - } - } - - if (styleRule.constructor.name === "CSSNestedDeclarations") { - if (styleRule.style.length) { - parentRule.cssRules.push(styleRule); - styleRule.__parentRule = parentRule; - styleRule.__parentStyleSheet = styleSheet; - pushToAncestorRules(parentRule); - } else { - // If the styleRule is empty, we can assume that it's a nested selector - pushToAncestorRules(parentRule); - } - } else { - currentScope = parentRule = styleRule; - pushToAncestorRules(parentRule); - styleRule.__parentStyleSheet = styleSheet; - } - - styleRule = new CSSOM.CSSStyleRule(); - - // Check if tokenizer detected an unmatched quote BEFORE setting up the rule - if (hasUnmatchedQuoteInSelector) { - handleUnmatchedQuoteInSelector("before-name"); - break; - } - - var processedSelectorText = processSelectorText(buffer.trim()); - // In a nested selector, ensure each selector contains '&' at the beginning, except for selectors that already have '&' somewhere - if (parentRule.constructor.name === "CSSScopeRule" || (parentRule.constructor.name !== "CSSStyleRule" && parentRule.parentRule === null)) { - // Normalize comma spacing: split by commas and rejoin with ", " - styleRule.selectorText = parseAndSplitNestedSelectors(processedSelectorText).join(', '); - } else { - styleRule.selectorText = parseAndSplitNestedSelectors(processedSelectorText).map(function (sel) { - // Add & at the beginning if there's no & in the selector, or if it starts with a combinator - return (sel.indexOf('&') === -1 || startsWithCombinatorRegExp.test(sel)) ? '& ' + sel : sel; - }).join(', '); - } - styleRule.style.__starts = i - buffer.length; - styleRule.__parentRule = parentRule; - // Only set nestedSelectorRule if we're directly inside a CSSStyleRule or CSSScopeRule, - // not inside other grouping rules like @media/@supports - if (parentRule.constructor.name === "CSSStyleRule" || parentRule.constructor.name === "CSSScopeRule") { - nestedSelectorRule = styleRule; - } - - // Set __parentStyleSheet for the new nested styleRule - styleRule.__parentStyleSheet = styleSheet; - - // Update currentScope and parentRule to the new nested styleRule - // so that subsequent content (like @-rules) will be children of this rule - currentScope = parentRule = styleRule; - - buffer = ""; - state = "before-name"; - } - break; - - case ":": - if (state === "name") { - // It can be a nested selector, let's check - var openBraceBeforeMatch = token.slice(i).match(declarationOrOpenBraceRegExp); - var hasOpenBraceBefore = openBraceBeforeMatch && openBraceBeforeMatch[0] === '{'; - if (hasOpenBraceBefore) { - // Is a selector - buffer += character; - } else { - // Is a declaration - name = buffer.trim(); - buffer = ""; - state = "before-value"; - } - } else { - buffer += character; - } - break; - - case "(": - if (state === 'value') { - // ie css expression mode - if (buffer.trim() === 'expression') { - var info = (new CSSOM.CSSValueExpression(token, i)).parse(); - - if (info.error) { - parseError(info.error); - } else { - buffer += info.expression; - i = info.idx; - } - } else { - state = 'value-parenthesis'; - //always ensure this is reset to 1 on transition - //from value to value-parenthesis - valueParenthesisDepth = 1; - buffer += character; - } - } else if (state === 'value-parenthesis') { - valueParenthesisDepth++; - buffer += character; - } else { - buffer += character; - } - break; - - case ")": - if (state === 'value-parenthesis') { - valueParenthesisDepth--; - if (valueParenthesisDepth === 0) state = 'value'; - } - buffer += character; - break; - - case "!": - if (state === "value" && token.indexOf("!important", i) === i) { - priority = "important"; - i += "important".length; - } else { - buffer += character; - } - break; - - case ";": - switch (state) { - case "before-value": - case "before-name": - parseError("Unexpected ;"); - buffer = ""; - state = "before-name"; - break; - case "value": - styleRule.style.setProperty(name, buffer.trim(), priority, parseError); - priority = ""; - buffer = ""; - state = "before-name"; - break; - case "atRule": - buffer = ""; - state = "before-selector"; - break; - case "importRule": - var isValid = topScope.cssRules.length === 0 || topScope.cssRules.some(function (rule) { - return ['CSSImportRule', 'CSSLayerStatementRule'].indexOf(rule.constructor.name) !== -1 - }); - if (isValid) { - importRule = new CSSOM.CSSImportRule(); - if (opts && opts.globalObject && opts.globalObject.CSSStyleSheet) { - importRule.__styleSheet = new opts.globalObject.CSSStyleSheet(); - } - importRule.styleSheet.__constructed = false; - importRule.__parentStyleSheet = importRule.styleSheet.__parentStyleSheet = styleSheet; - importRule.parse(buffer + character); - topScope.cssRules.push(importRule); - } - buffer = ""; - state = "before-selector"; - break; - case "namespaceRule": - var isValid = topScope.cssRules.length === 0 || topScope.cssRules.every(function (rule) { - return ['CSSImportRule', 'CSSLayerStatementRule', 'CSSNamespaceRule'].indexOf(rule.constructor.name) !== -1 - }); - if (isValid) { - try { - // Validate namespace syntax before creating the rule - var testNamespaceRule = new CSSOM.CSSNamespaceRule(); - testNamespaceRule.parse(buffer + character); - - namespaceRule = testNamespaceRule; - namespaceRule.__parentStyleSheet = styleSheet; - topScope.cssRules.push(namespaceRule); - - // Track the namespace prefix for validation - if (namespaceRule.prefix) { - definedNamespacePrefixes[namespaceRule.prefix] = namespaceRule.namespaceURI; - } - } catch (e) { - parseError(e.message); - } - } - buffer = ""; - state = "before-selector"; - break; - case "layerBlock": - var nameListStr = buffer.trim().split(",").map(function (name) { - return name.trim(); - }); - var isInvalid = nameListStr.some(function (name) { - return name.trim().match(cssCustomIdentifierRegExp) === null; - }); - - // Check if there's a CSSStyleRule in the parent chain - var hasStyleRuleParent = false; - if (parentRule) { - var checkParent = parentRule; - while (checkParent) { - if (checkParent.constructor.name === "CSSStyleRule") { - hasStyleRuleParent = true; - break; - } - checkParent = checkParent.__parentRule; - } - } - - if (!isInvalid && !hasStyleRuleParent) { - layerStatementRule = new CSSOM.CSSLayerStatementRule(); - layerStatementRule.__parentStyleSheet = styleSheet; - layerStatementRule.__starts = layerBlockRule.__starts; - layerStatementRule.__ends = i; - layerStatementRule.nameList = nameListStr; - - // Add to parent rule if nested, otherwise to top scope - if (parentRule) { - layerStatementRule.__parentRule = parentRule; - parentRule.cssRules.push(layerStatementRule); - } else { - topScope.cssRules.push(layerStatementRule); - } - } - buffer = ""; - state = "before-selector"; - break; - default: - buffer += character; - break; - } - break; - - case "}": - if (state === "counterStyleBlock") { - // FIXME : Implement missing properties on CSSCounterStyleRule interface and update parse method - // For now it's just assigning entire rule text - if (counterStyleRule.name) { - // Only process if name was set (valid) - counterStyleRule.parse("@counter-style " + counterStyleRule.name + " { " + buffer + " }"); - counterStyleRule.__ends = i + 1; - // Add to parent's cssRules - if (counterStyleRule.__parentRule) { - counterStyleRule.__parentRule.cssRules.push(counterStyleRule); - } else { - topScope.cssRules.push(counterStyleRule); - } - } - // Restore currentScope to parent after closing this rule - if (counterStyleRule.__parentRule) { - currentScope = counterStyleRule.__parentRule; - } - styleRule = null; - buffer = ""; - state = "before-selector"; - break; - } - if (state === "propertyBlock") { - // Only process if name was set (valid) - if (propertyRule.__name) { - var parseSuccess = propertyRule.parse("@property " + propertyRule.__name + " { " + buffer + " }"); - // Only add the rule if parse was successful (syntax, inherits, and initial-value validation passed) - if (parseSuccess) { - propertyRule.__ends = i + 1; - // Add to parent's cssRules - if (propertyRule.__parentRule) { - propertyRule.__parentRule.cssRules.push(propertyRule); - } else { - topScope.cssRules.push(propertyRule); - } - } - } - // Restore currentScope to parent after closing this rule - if (propertyRule.__parentRule) { - currentScope = propertyRule.__parentRule; - } - styleRule = null; - buffer = ""; - state = "before-selector"; - break; - } - switch (state) { - case "value": - styleRule.style.setProperty(name, buffer.trim(), priority, parseError); - priority = ""; - /* falls through */ - case "before-value": - case "before-name": - case "name": - styleRule.__ends = i + 1; - - if (parentRule === styleRule) { - parentRule = ancestorRules.pop() - } - - if (parentRule) { - styleRule.__parentRule = parentRule; - } - styleRule.__parentStyleSheet = styleSheet; - - if (currentScope === styleRule) { - currentScope = parentRule || topScope; - } - - if (styleRule.constructor.name === "CSSStyleRule" && !isValidSelectorText(styleRule.selectorText)) { - if (styleRule === nestedSelectorRule) { - nestedSelectorRule = null; - } - parseError('Invalid CSSStyleRule (selectorText = "' + styleRule.selectorText + '")', styleRule.parentRule !== null); - } else { - if (styleRule.parentRule) { - styleRule.parentRule.cssRules.push(styleRule); - } else { - currentScope.cssRules.push(styleRule); - } - } - buffer = ""; - if (currentScope.constructor === CSSOM.CSSKeyframesRule) { - state = "keyframeRule-begin"; - } else { - state = "before-selector"; - } - - if (styleRule.constructor.name === "CSSNestedDeclarations") { - if (currentScope !== topScope) { - // Only set nestedSelectorRule if currentScope is CSSStyleRule or CSSScopeRule - // Not for other grouping rules like @media/@supports - if (currentScope.constructor.name === "CSSStyleRule" || currentScope.constructor.name === "CSSScopeRule") { - nestedSelectorRule = currentScope; - } - } - styleRule = null; - } else { - // Update nestedSelectorRule when closing a CSSStyleRule - if (styleRule === nestedSelectorRule) { - var selector = styleRule.selectorText && styleRule.selectorText.trim(); - // Check if this is proper nesting (&.class, &:pseudo) vs prepended & (& :is, & .class with space) - // Prepended & has pattern "& X" where X starts with : or . - var isPrependedAmpersand = selector && selector.match(prependedAmpersandRegExp); - - // Check if parent is a grouping rule that can contain nested selectors - var isGroupingRule = currentScope && currentScope instanceof CSSOM.CSSGroupingRule; - - if (!isPrependedAmpersand && isGroupingRule) { - // Proper nesting - set nestedSelectorRule to parent for more nested selectors - // But only if it's a CSSStyleRule or CSSScopeRule, not other grouping rules like @media - if (currentScope.constructor.name === "CSSStyleRule" || currentScope.constructor.name === "CSSScopeRule") { - nestedSelectorRule = currentScope; - } - // If currentScope is another type of grouping rule (like @media), keep nestedSelectorRule unchanged - } else { - // Prepended & or not nested in grouping rule - reset to prevent CSSNestedDeclarations - nestedSelectorRule = null; - } - } else if (nestedSelectorRule && currentScope instanceof CSSOM.CSSGroupingRule) { - // When closing a nested rule that's not the nestedSelectorRule itself, - // maintain nestedSelectorRule if we're still inside a grouping rule - // This ensures declarations after nested selectors inside @media/@supports etc. work correctly - } - styleRule = null; - break; - } - case "keyframeRule-begin": - case "before-selector": - case "selector": - // End of media/supports/document rule. - if (!parentRule) { - parseError("Unexpected }"); - - var hasPreviousStyleRule = currentScope.cssRules.length && currentScope.cssRules[currentScope.cssRules.length - 1].constructor.name === "CSSStyleRule"; - if (hasPreviousStyleRule) { - i = ignoreBalancedBlock(i, token.slice(i), 1); - } - - break; - } - - // Find the actual parent rule by popping from ancestor stack - while (ancestorRules.length > 0) { - parentRule = ancestorRules.pop(); - - // Skip if we popped the current scope itself (happens because we push both rule and parent) - if (parentRule === currentScope) { - continue; - } - - // Only process valid grouping rules - if (!(parentRule instanceof CSSOM.CSSGroupingRule && (parentRule.constructor.name !== 'CSSStyleRule' || parentRule.__parentRule))) { - continue; - } - - // Determine if we're closing a special nested selector context - var isClosingNestedSelectorContext = nestedSelectorRule && - (currentScope === nestedSelectorRule || nestedSelectorRule.__parentRule === currentScope); - - if (isClosingNestedSelectorContext) { - // Closing the nestedSelectorRule or its direct container - if (nestedSelectorRule.parentRule) { - // Add nestedSelectorRule to its parent and update scope - prevScope = nestedSelectorRule; - currentScope = nestedSelectorRule.parentRule; - // Use object lookup instead of O(n) indexOf - var scopeId = getRuleId(prevScope); - if (!addedToCurrentScope[scopeId]) { - currentScope.cssRules.push(prevScope); - addedToCurrentScope[scopeId] = true; - } - nestedSelectorRule = currentScope; - // Stop here to preserve context for sibling selectors - break; - } else { - // Top-level CSSStyleRule with nested grouping rule - prevScope = currentScope; - var actualParent = ancestorRules.length > 0 ? ancestorRules[ancestorRules.length - 1] : nestedSelectorRule; - if (actualParent !== prevScope) { - actualParent.cssRules.push(prevScope); - } - currentScope = actualParent; - parentRule = actualParent; - break; - } - } else { - // Regular case: add currentScope to parentRule - prevScope = currentScope; - if (parentRule !== prevScope) { - parentRule.cssRules.push(prevScope); - } - break; - } - } - - // If currentScope has a __parentRule and wasn't added yet, add it - if (ancestorRules.length === 0 && currentScope.__parentRule && currentScope.__parentRule.cssRules) { - // Use object lookup instead of O(n) findIndex - var parentId = getRuleId(currentScope); - if (!addedToParent[parentId]) { - currentScope.__parentRule.cssRules.push(currentScope); - addedToParent[parentId] = true; - } - } - - // Only handle top-level rule closing if we processed all ancestors - if (ancestorRules.length === 0 && currentScope.parentRule == null) { - currentScope.__ends = i + 1; - // Use object lookup instead of O(n) findIndex - var topId = getRuleId(currentScope); - if (currentScope !== topScope && !addedToTopScope[topId]) { - topScope.cssRules.push(currentScope); - addedToTopScope[topId] = true; - } - currentScope = topScope; - if (nestedSelectorRule === parentRule) { - // Check if this selector is really starting inside another selector - var nestedSelectorTokenToCurrentSelectorToken = token.slice(nestedSelectorRule.__starts, i + 1); - var openingBraceMatch = nestedSelectorTokenToCurrentSelectorToken.match(openBraceGlobalRegExp); - var closingBraceMatch = nestedSelectorTokenToCurrentSelectorToken.match(closeBraceGlobalRegExp); - var openingBraceLen = openingBraceMatch && openingBraceMatch.length; - var closingBraceLen = closingBraceMatch && closingBraceMatch.length; - - if (openingBraceLen === closingBraceLen) { - // If the number of opening and closing braces are equal, we can assume that the new selector is starting outside the nestedSelectorRule - nestedSelectorRule.__ends = i + 1; - nestedSelectorRule = null; - parentRule = null; - } - } else { - parentRule = null; - } - } else { - currentScope = parentRule; - } - - buffer = ""; - state = "before-selector"; - break; - } - break; - - default: - switch (state) { - case "before-selector": - state = "selector"; - if ((styleRule || scopeRule) && parentRule) { - // Assuming it's a declaration inside Nested Selector OR a Nested Declaration - // If Declaration inside Nested Selector let's keep the same styleRule - if (!isSelectorStartChar(character) && !isWhitespaceChar(character) && parentRule instanceof CSSOM.CSSGroupingRule) { - // parentRule.__parentRule = styleRule; - state = "before-name"; - if (styleRule !== parentRule) { - styleRule = new CSSOM.CSSNestedDeclarations(); - styleRule.__starts = i; - } - } - - } else if (nestedSelectorRule && parentRule && parentRule instanceof CSSOM.CSSGroupingRule) { - if (isSelectorStartChar(character)) { - // If starting with a selector character, create CSSStyleRule instead of CSSNestedDeclarations - styleRule = new CSSOM.CSSStyleRule(); - styleRule.__starts = i; - } else if (!isWhitespaceChar(character)) { - // Starting a declaration (not whitespace, not a selector) - state = "before-name"; - // Check if we should create CSSNestedDeclarations - // This happens if: parent has cssRules OR nestedSelectorRule exists (indicating CSSStyleRule in hierarchy) - if (parentRule.cssRules.length || nestedSelectorRule) { - currentScope = parentRule; - // Only set nestedSelectorRule if parentRule is CSSStyleRule or CSSScopeRule - if (parentRule.constructor.name === "CSSStyleRule" || parentRule.constructor.name === "CSSScopeRule") { - nestedSelectorRule = parentRule; - } - styleRule = new CSSOM.CSSNestedDeclarations(); - styleRule.__starts = i; - } else { - if (parentRule.constructor.name === "CSSStyleRule") { - styleRule = parentRule; - } else { - styleRule = new CSSOM.CSSStyleRule(); - styleRule.__starts = i; - } - } - } - } - break; - case "before-name": - state = "name"; - break; - case "before-value": - state = "value"; - break; - case "importRule-begin": - state = "importRule"; - break; - case "namespaceRule-begin": - state = "namespaceRule"; - break; - } - buffer += character; - break; - } - - // Auto-close all unclosed nested structures - // Check AFTER processing the character, at the ORIGINAL ending index - // Only add closing braces if CSS is incomplete (not at top scope) - if (i === initialEndingIndex && (currentScope !== topScope || ancestorRules.length > 0)) { - var needsClosing = ancestorRules.length; - if (currentScope !== topScope && ancestorRules.indexOf(currentScope) === -1) { - needsClosing += 1; - } - // Add closing braces for all unclosed structures - for (var closeIdx = 0; closeIdx < needsClosing; closeIdx++) { - token += "}"; - endingIndex += 1; - } - } - } - - if (buffer.trim() !== "") { - parseError("Unexpected end of input"); - } - - return styleSheet; -}; - - -//.CommonJS -exports.parse = CSSOM.parse; -// The following modules cannot be included sooner due to the mutual dependency with parse.js -CSSOM.CSSStyleSheet = require("./CSSStyleSheet").CSSStyleSheet; -CSSOM.CSSStyleRule = require("./CSSStyleRule").CSSStyleRule; -CSSOM.CSSNestedDeclarations = require("./CSSNestedDeclarations").CSSNestedDeclarations; -CSSOM.CSSImportRule = require("./CSSImportRule").CSSImportRule; -CSSOM.CSSNamespaceRule = require("./CSSNamespaceRule").CSSNamespaceRule; -CSSOM.CSSGroupingRule = require("./CSSGroupingRule").CSSGroupingRule; -CSSOM.CSSMediaRule = require("./CSSMediaRule").CSSMediaRule; -CSSOM.CSSCounterStyleRule = require("./CSSCounterStyleRule").CSSCounterStyleRule; -CSSOM.CSSPropertyRule = require("./CSSPropertyRule").CSSPropertyRule; -CSSOM.CSSContainerRule = require("./CSSContainerRule").CSSContainerRule; -CSSOM.CSSConditionRule = require("./CSSConditionRule").CSSConditionRule; -CSSOM.CSSSupportsRule = require("./CSSSupportsRule").CSSSupportsRule; -CSSOM.CSSFontFaceRule = require("./CSSFontFaceRule").CSSFontFaceRule; -CSSOM.CSSHostRule = require("./CSSHostRule").CSSHostRule; -CSSOM.CSSStartingStyleRule = require("./CSSStartingStyleRule").CSSStartingStyleRule; -CSSOM.CSSStyleDeclaration = require('./CSSStyleDeclaration').CSSStyleDeclaration; -CSSOM.CSSKeyframeRule = require('./CSSKeyframeRule').CSSKeyframeRule; -CSSOM.CSSKeyframesRule = require('./CSSKeyframesRule').CSSKeyframesRule; -CSSOM.CSSValueExpression = require('./CSSValueExpression').CSSValueExpression; -CSSOM.CSSDocumentRule = require('./CSSDocumentRule').CSSDocumentRule; -CSSOM.CSSScopeRule = require('./CSSScopeRule').CSSScopeRule; -CSSOM.CSSLayerBlockRule = require("./CSSLayerBlockRule").CSSLayerBlockRule; -CSSOM.CSSLayerStatementRule = require("./CSSLayerStatementRule").CSSLayerStatementRule; -CSSOM.CSSPageRule = require("./CSSPageRule").CSSPageRule; -// Use cssstyle if available -require("./cssstyleTryCatchBlock"); -///CommonJS |