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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, 3332 insertions, 0 deletions
diff --git a/vanilla/node_modules/@acemir/cssom/lib/parse.js b/vanilla/node_modules/@acemir/cssom/lib/parse.js new file mode 100644 index 0000000..09d4ade --- /dev/null +++ b/vanilla/node_modules/@acemir/cssom/lib/parse.js @@ -0,0 +1,3332 @@ +//.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 |