Current File : /www/specpages-backup/node_modules/less/lib/less/parser/parser.js.map
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LessError from '../less-error';\nimport tree from '../tree';\nimport visitors from '../visitors';\nimport getParserInput from './parser-input';\nimport * as utils from '../utils';\nimport functionRegistry from '../functions/function-registry';\n\n//\n// less.js - parser\n//\n// A relatively straight-forward predictive parser.\n// There is no tokenization/lexing stage, the input is parsed\n// in one sweep.\n//\n// To make the parser fast enough to run in the browser, several\n// optimization had to be made:\n//\n// - Matching and slicing on a huge input is often cause of slowdowns.\n// The solution is to chunkify the input into smaller strings.\n// The chunks are stored in the `chunks` var,\n// `j` holds the current chunk index, and `currentPos` holds\n// the index of the current chunk in relation to `input`.\n// This gives us an almost 4x speed-up.\n//\n// - In many cases, we don't need to match individual tokens;\n// for example, if a value doesn't hold any variables, operations\n// or dynamic references, the parser can effectively 'skip' it,\n// treating it as a literal.\n// An example would be '1px solid #000' - which evaluates to itself,\n// we don't need to know what the individual components are.\n// The drawback, of course is that you don't get the benefits of\n// syntax-checking on the CSS. This gives us a 50% speed-up in the parser,\n// and a smaller speed-up in the code-gen.\n//\n//\n// Token matching is done with the `$` function, which either takes\n// a terminal string or regexp, or a non-terminal function to call.\n// It also takes care of moving all the indices forwards.\n//\n\nconst Parser = function Parser(context, imports, fileInfo) {\n let parsers;\n const parserInput = getParserInput();\n\n function error(msg, type) {\n throw new LessError(\n {\n index: parserInput.i,\n filename: fileInfo.filename,\n type: type || 'Syntax',\n message: msg\n },\n imports\n );\n }\n\n function expect(arg, msg) {\n // some older browsers return typeof 'function' for RegExp\n const result = (arg instanceof Function) ? arg.call(parsers) : parserInput.$re(arg);\n if (result) {\n return result;\n }\n \n error(msg || (typeof arg === 'string'\n ? `expected '${arg}' got '${parserInput.currentChar()}'`\n : 'unexpected token'));\n }\n\n // Specialization of expect()\n function expectChar(arg, msg) {\n if (parserInput.$char(arg)) {\n return arg;\n }\n error(msg || `expected '${arg}' got '${parserInput.currentChar()}'`);\n }\n\n function getDebugInfo(index) {\n const filename = fileInfo.filename;\n\n return {\n lineNumber: utils.getLocation(index, parserInput.getInput()).line + 1,\n fileName: filename\n };\n }\n\n /**\n * Used after initial parsing to create nodes on the fly\n * \n * @param {String} str - string to parse \n * @param {Array} parseList - array of parsers to run input through e.g. [\"value\", \"important\"]\n * @param {Number} currentIndex - start number to begin indexing\n * @param {Object} fileInfo - fileInfo to attach to created nodes\n */\n function parseNode(str, parseList, currentIndex, fileInfo, callback) {\n let result;\n const returnNodes = [];\n const parser = parserInput;\n\n try {\n parser.start(str, false, function fail(msg, index) {\n callback({\n message: msg,\n index: index + currentIndex\n });\n });\n for (let x = 0, p, i; (p = parseList[x]); x++) {\n i = parser.i;\n result = parsers[p]();\n if (result) {\n try {\n result._index = i + currentIndex;\n result._fileInfo = fileInfo;\n } catch (e) {}\n returnNodes.push(result);\n }\n else {\n returnNodes.push(null);\n }\n }\n\n const endInfo = parser.end();\n if (endInfo.isFinished) {\n callback(null, returnNodes);\n }\n else {\n callback(true, null);\n }\n } catch (e) {\n throw new LessError({\n index: e.index + currentIndex,\n message: e.message\n }, imports, fileInfo.filename);\n }\n }\n\n //\n // The Parser\n //\n return {\n parserInput,\n imports,\n fileInfo,\n parseNode,\n //\n // Parse an input string into an abstract syntax tree,\n // @param str A string containing 'less' markup\n // @param callback call `callback` when done.\n // @param [additionalData] An optional map which can contains vars - a map (key, value) of variables to apply\n //\n parse: function (str, callback, additionalData) {\n let root;\n let error = null;\n let globalVars;\n let modifyVars;\n let ignored;\n let preText = '';\n\n globalVars = (additionalData && additionalData.globalVars) ? `${Parser.serializeVars(additionalData.globalVars)}\\n` : '';\n modifyVars = (additionalData && additionalData.modifyVars) ? `\\n${Parser.serializeVars(additionalData.modifyVars)}` : '';\n\n if (context.pluginManager) {\n const preProcessors = context.pluginManager.getPreProcessors();\n for (let i = 0; i < preProcessors.length; i++) {\n str = preProcessors[i].process(str, { context, imports, fileInfo });\n }\n }\n\n if (globalVars || (additionalData && additionalData.banner)) {\n preText = ((additionalData && additionalData.banner) ? additionalData.banner : '') + globalVars;\n ignored = imports.contentsIgnoredChars;\n ignored[fileInfo.filename] = ignored[fileInfo.filename] || 0;\n ignored[fileInfo.filename] += preText.length;\n }\n\n str = str.replace(/\\r\\n?/g, '\\n');\n // Remove potential UTF Byte Order Mark\n str = preText + str.replace(/^\\uFEFF/, '') + modifyVars;\n imports.contents[fileInfo.filename] = str;\n\n // Start with the primary rule.\n // The whole syntax tree is held under a Ruleset node,\n // with the `root` property set to true, so no `{}` are\n // output. The callback is called when the input is parsed.\n try {\n parserInput.start(str, context.chunkInput, function fail(msg, index) {\n throw new LessError({\n index,\n type: 'Parse',\n message: msg,\n filename: fileInfo.filename\n }, imports);\n });\n\n tree.Node.prototype.parse = this;\n root = new tree.Ruleset(null, this.parsers.primary());\n tree.Node.prototype.rootNode = root;\n root.root = true;\n root.firstRoot = true;\n root.functionRegistry = functionRegistry.inherit();\n \n } catch (e) {\n return callback(new LessError(e, imports, fileInfo.filename));\n }\n\n // If `i` is smaller than the `input.length - 1`,\n // it means the parser wasn't able to parse the whole\n // string, so we've got a parsing error.\n //\n // We try to extract a \\n delimited string,\n // showing the line where the parse error occurred.\n // We split it up into two parts (the part which parsed,\n // and the part which didn't), so we can color them differently.\n const endInfo = parserInput.end();\n if (!endInfo.isFinished) {\n\n let message = endInfo.furthestPossibleErrorMessage;\n\n if (!message) {\n message = 'Unrecognised input';\n if (endInfo.furthestChar === '}') {\n message += '. Possibly missing opening \\'{\\'';\n } else if (endInfo.furthestChar === ')') {\n message += '. Possibly missing opening \\'(\\'';\n } else if (endInfo.furthestReachedEnd) {\n message += '. Possibly missing something';\n }\n }\n\n error = new LessError({\n type: 'Parse',\n message,\n index: endInfo.furthest,\n filename: fileInfo.filename\n }, imports);\n }\n\n const finish = e => {\n e = error || e || imports.error;\n\n if (e) {\n if (!(e instanceof LessError)) {\n e = new LessError(e, imports, fileInfo.filename);\n }\n\n return callback(e);\n }\n else {\n return callback(null, root);\n }\n };\n\n if (context.processImports !== false) {\n new visitors.ImportVisitor(imports, finish)\n .run(root);\n } else {\n return finish();\n }\n },\n\n //\n // Here in, the parsing rules/functions\n //\n // The basic structure of the syntax tree generated is as follows:\n //\n // Ruleset -> Declaration -> Value -> Expression -> Entity\n //\n // Here's some Less code:\n //\n // .class {\n // color: #fff;\n // border: 1px solid #000;\n // width: @w + 4px;\n // > .child {...}\n // }\n //\n // And here's what the parse tree might look like:\n //\n // Ruleset (Selector '.class', [\n // Declaration (\"color\", Value ([Expression [Color #fff]]))\n // Declaration (\"border\", Value ([Expression [Dimension 1px][Keyword \"solid\"][Color #000]]))\n // Declaration (\"width\", Value ([Expression [Operation \" + \" [Variable \"@w\"][Dimension 4px]]]))\n // Ruleset (Selector [Element '>', '.child'], [...])\n // ])\n //\n // In general, most rules will try to parse a token with the `$re()` function, and if the return\n // value is truly, will return a new node, of the relevant type. Sometimes, we need to check\n // first, before parsing, that's when we use `peek()`.\n //\n parsers: parsers = {\n //\n // The `primary` rule is the *entry* and *exit* point of the parser.\n // The rules here can appear at any level of the parse tree.\n //\n // The recursive nature of the grammar is an interplay between the `block`\n // rule, which represents `{ ... }`, the `ruleset` rule, and this `primary` rule,\n // as represented by this simplified grammar:\n //\n // primary → (ruleset | declaration)+\n // ruleset → selector+ block\n // block → '{' primary '}'\n //\n // Only at one point is the primary rule not called from the\n // block rule: at the root level.\n //\n primary: function () {\n const mixin = this.mixin;\n let root = [];\n let node;\n\n while (true) {\n while (true) {\n node = this.comment();\n if (!node) { break; }\n root.push(node);\n }\n // always process comments before deciding if finished\n if (parserInput.finished) {\n break;\n }\n if (parserInput.peek('}')) {\n break;\n }\n\n node = this.extendRule();\n if (node) {\n root = root.concat(node);\n continue;\n }\n\n node = mixin.definition() || this.declaration() || mixin.call(false, false) || \n this.ruleset() || this.variableCall() || this.entities.call() || this.atrule();\n if (node) {\n root.push(node);\n } else {\n let foundSemiColon = false;\n while (parserInput.$char(';')) {\n foundSemiColon = true;\n }\n if (!foundSemiColon) {\n break;\n }\n }\n }\n\n return root;\n },\n\n // comments are collected by the main parsing mechanism and then assigned to nodes\n // where the current structure allows it\n comment: function () {\n if (parserInput.commentStore.length) {\n const comment = parserInput.commentStore.shift();\n return new(tree.Comment)(comment.text, comment.isLineComment, comment.index, fileInfo);\n }\n },\n\n //\n // Entities are tokens which can be found inside an Expression\n //\n entities: {\n mixinLookup: function() {\n return parsers.mixin.call(true, true);\n },\n //\n // A string, which supports escaping \" and '\n //\n // \"milky way\" 'he\\'s the one!'\n //\n quoted: function (forceEscaped) {\n let str;\n const index = parserInput.i;\n let isEscaped = false;\n\n parserInput.save();\n if (parserInput.$char('~')) {\n isEscaped = true;\n } else if (forceEscaped) {\n parserInput.restore();\n return;\n }\n\n str = parserInput.$quoted();\n if (!str) {\n parserInput.restore();\n return;\n }\n parserInput.forget();\n\n return new(tree.Quoted)(str.charAt(0), str.substr(1, str.length - 2), isEscaped, index, fileInfo);\n },\n\n //\n // A catch-all word, such as:\n //\n // black border-collapse\n //\n keyword: function () {\n const k = parserInput.$char('%') || parserInput.$re(/^\\[?(?:[\\w-]|\\\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+\\]?/);\n if (k) {\n return tree.Color.fromKeyword(k) || new(tree.Keyword)(k);\n }\n },\n\n //\n // A function call\n //\n // rgb(255, 0, 255)\n //\n // The arguments are parsed with the `entities.arguments` parser.\n //\n call: function () {\n let name;\n let args;\n let func;\n const index = parserInput.i;\n\n // http://jsperf.com/case-insensitive-regex-vs-strtolower-then-regex/18\n if (parserInput.peek(/^url\\(/i)) {\n return;\n }\n\n parserInput.save();\n\n name = parserInput.$re(/^([\\w-]+|%|progid:[\\w\\.]+)\\(/);\n if (!name) {\n parserInput.forget(); \n return;\n }\n\n name = name[1];\n func = this.customFuncCall(name);\n if (func) {\n args = func.parse();\n if (args && func.stop) {\n parserInput.forget();\n return args;\n }\n }\n\n args = this.arguments(args);\n\n if (!parserInput.$char(')')) {\n parserInput.restore('Could not parse call arguments or missing \\')\\'');\n return;\n }\n\n parserInput.forget();\n\n return new(tree.Call)(name, args, index, fileInfo);\n },\n \n //\n // Parsing rules for functions with non-standard args, e.g.:\n //\n // boolean(not(2 > 1))\n //\n // This is a quick prototype, to be modified/improved when\n // more custom-parsed funcs come (e.g. `selector(...)`)\n //\n\n customFuncCall: function (name) {\n /* Ideally the table is to be moved out of here for faster perf.,\n but it's quite tricky since it relies on all these `parsers`\n and `expect` available only here */\n return {\n alpha: f(parsers.ieAlpha, true),\n boolean: f(condition),\n 'if': f(condition)\n }[name.toLowerCase()];\n\n function f(parse, stop) {\n return {\n parse, // parsing function\n stop // when true - stop after parse() and return its result, \n // otherwise continue for plain args\n };\n }\n \n function condition() {\n return [expect(parsers.condition, 'expected condition')];\n }\n },\n\n arguments: function (prevArgs) {\n let argsComma = prevArgs || [];\n const argsSemiColon = [];\n let isSemiColonSeparated;\n let value;\n\n parserInput.save();\n\n while (true) {\n if (prevArgs) {\n prevArgs = false;\n } else {\n value = parsers.detachedRuleset() || this.assignment() || parsers.expression();\n if (!value) {\n break;\n }\n\n if (value.value && value.value.length == 1) {\n value = value.value[0];\n }\n\n argsComma.push(value);\n }\n\n if (parserInput.$char(',')) {\n continue;\n }\n\n if (parserInput.$char(';') || isSemiColonSeparated) {\n isSemiColonSeparated = true;\n value = (argsComma.length < 1) ? argsComma[0]\n : new tree.Value(argsComma);\n argsSemiColon.push(value);\n argsComma = [];\n }\n }\n\n parserInput.forget();\n return isSemiColonSeparated ? argsSemiColon : argsComma;\n },\n literal: function () {\n return this.dimension() ||\n this.color() ||\n this.quoted() ||\n this.unicodeDescriptor();\n },\n\n // Assignments are argument entities for calls.\n // They are present in ie filter properties as shown below.\n //\n // filter: progid:DXImageTransform.Microsoft.Alpha( *opacity=50* )\n //\n\n assignment: function () {\n let key;\n let value;\n parserInput.save();\n key = parserInput.$re(/^\\w+(?=\\s?=)/i);\n if (!key) {\n parserInput.restore();\n return;\n }\n if (!parserInput.$char('=')) {\n parserInput.restore();\n return;\n }\n value = parsers.entity();\n if (value) {\n parserInput.forget();\n return new(tree.Assignment)(key, value);\n } else {\n parserInput.restore();\n }\n },\n\n //\n // Parse url() tokens\n //\n // We use a specific rule for urls, because they don't really behave like\n // standard function calls. The difference is that the argument doesn't have\n // to be enclosed within a string, so it can't be parsed as an Expression.\n //\n url: function () {\n let value;\n const index = parserInput.i;\n\n parserInput.autoCommentAbsorb = false;\n\n if (!parserInput.$str('url(')) {\n parserInput.autoCommentAbsorb = true;\n return;\n }\n\n value = this.quoted() || this.variable() || this.property() ||\n parserInput.$re(/^(?:(?:\\\\[\\(\\)'\"])|[^\\(\\)'\"])+/) || '';\n\n parserInput.autoCommentAbsorb = true;\n\n expectChar(')');\n\n return new(tree.URL)((value.value != null || \n value instanceof tree.Variable || \n value instanceof tree.Property) ?\n value : new(tree.Anonymous)(value, index), index, fileInfo);\n },\n\n //\n // A Variable entity, such as `@fink`, in\n //\n // width: @fink + 2px\n //\n // We use a different parser for variable definitions,\n // see `parsers.variable`.\n //\n variable: function () {\n let ch;\n let name;\n const index = parserInput.i;\n\n parserInput.save();\n if (parserInput.currentChar() === '@' && (name = parserInput.$re(/^@@?[\\w-]+/))) {\n ch = parserInput.currentChar();\n if (ch === '(' || ch === '[' && !parserInput.prevChar().match(/^\\s/)) {\n // this may be a VariableCall lookup\n const result = parsers.variableCall(name);\n if (result) {\n parserInput.forget();\n return result;\n }\n }\n parserInput.forget();\n return new(tree.Variable)(name, index, fileInfo);\n }\n parserInput.restore();\n },\n\n // A variable entity using the protective {} e.g. @{var}\n variableCurly: function () {\n let curly;\n const index = parserInput.i;\n\n if (parserInput.currentChar() === '@' && (curly = parserInput.$re(/^@\\{([\\w-]+)\\}/))) {\n return new(tree.Variable)(`@${curly[1]}`, index, fileInfo);\n }\n },\n //\n // A Property accessor, such as `$color`, in\n //\n // background-color: $color\n //\n property: function () {\n let name;\n const index = parserInput.i;\n\n if (parserInput.currentChar() === '$' && (name = parserInput.$re(/^\\$[\\w-]+/))) {\n return new(tree.Property)(name, index, fileInfo);\n }\n },\n\n // A property entity useing the protective {} e.g. ${prop}\n propertyCurly: function () {\n let curly;\n const index = parserInput.i;\n\n if (parserInput.currentChar() === '$' && (curly = parserInput.$re(/^\\$\\{([\\w-]+)\\}/))) {\n return new(tree.Property)(`$${curly[1]}`, index, fileInfo);\n }\n },\n //\n // A Hexadecimal color\n //\n // #4F3C2F\n //\n // `rgb` and `hsl` colors are parsed through the `entities.call` parser.\n //\n color: function () {\n let rgb;\n parserInput.save();\n\n if (parserInput.currentChar() === '#' && (rgb = parserInput.$re(/^#([A-Fa-f0-9]{8}|[A-Fa-f0-9]{6}|[A-Fa-f0-9]{3,4})([\\w.#\\[])?/))) {\n if (!rgb[2]) {\n parserInput.forget();\n return new(tree.Color)(rgb[1], undefined, rgb[0]);\n } \n }\n parserInput.restore();\n },\n\n colorKeyword: function () {\n parserInput.save();\n const autoCommentAbsorb = parserInput.autoCommentAbsorb;\n parserInput.autoCommentAbsorb = false;\n const k = parserInput.$re(/^[_A-Za-z-][_A-Za-z0-9-]+/);\n parserInput.autoCommentAbsorb = autoCommentAbsorb;\n if (!k) {\n parserInput.forget();\n return;\n }\n parserInput.restore();\n const color = tree.Color.fromKeyword(k);\n if (color) {\n parserInput.$str(k);\n return color;\n }\n },\n\n //\n // A Dimension, that is, a number and a unit\n //\n // 0.5em 95%\n //\n dimension: function () {\n if (parserInput.peekNotNumeric()) {\n return;\n }\n\n const value = parserInput.$re(/^([+-]?\\d*\\.?\\d+)(%|[a-z_]+)?/i);\n if (value) {\n return new(tree.Dimension)(value[1], value[2]);\n }\n },\n\n //\n // A unicode descriptor, as is used in unicode-range\n //\n // U+0?? or U+00A1-00A9\n //\n unicodeDescriptor: function () {\n let ud;\n\n ud = parserInput.$re(/^U\\+[0-9a-fA-F?]+(\\-[0-9a-fA-F?]+)?/);\n if (ud) {\n return new(tree.UnicodeDescriptor)(ud[0]);\n }\n },\n\n //\n // JavaScript code to be evaluated\n //\n // `window.location.href`\n //\n javascript: function () {\n let js;\n const index = parserInput.i;\n\n parserInput.save();\n\n const escape = parserInput.$char('~');\n const jsQuote = parserInput.$char('`');\n\n if (!jsQuote) {\n parserInput.restore();\n return;\n }\n\n js = parserInput.$re(/^[^`]*`/);\n if (js) {\n parserInput.forget();\n return new(tree.JavaScript)(js.substr(0, js.length - 1), Boolean(escape), index, fileInfo);\n }\n parserInput.restore('invalid javascript definition');\n }\n },\n\n //\n // The variable part of a variable definition. Used in the `rule` parser\n //\n // @fink:\n //\n variable: function () {\n let name;\n\n if (parserInput.currentChar() === '@' && (name = parserInput.$re(/^(@[\\w-]+)\\s*:/))) { return name[1]; }\n },\n\n //\n // Call a variable value to retrieve a detached ruleset\n // or a value from a detached ruleset's rules.\n //\n // @fink();\n // @fink;\n // color: @fink[@color];\n //\n variableCall: function (parsedName) {\n let lookups;\n const i = parserInput.i;\n const inValue = !!parsedName;\n let name = parsedName;\n\n parserInput.save();\n\n if (name || (parserInput.currentChar() === '@'\n && (name = parserInput.$re(/^(@[\\w-]+)(\\(\\s*\\))?/)))) {\n\n lookups = this.mixin.ruleLookups();\n\n if (!lookups && ((inValue && parserInput.$str('()') !== '()') || (name[2] !== '()'))) {\n parserInput.restore('Missing \\'[...]\\' lookup in variable call');\n return;\n }\n\n if (!inValue) {\n name = name[1];\n }\n\n const call = new tree.VariableCall(name, i, fileInfo);\n if (!inValue && parsers.end()) {\n parserInput.forget();\n return call;\n }\n else {\n parserInput.forget();\n return new tree.NamespaceValue(call, lookups, i, fileInfo);\n }\n }\n\n parserInput.restore();\n },\n\n //\n // extend syntax - used to extend selectors\n //\n extend: function(isRule) {\n let elements;\n let e;\n const index = parserInput.i;\n let option;\n let extendList;\n let extend;\n\n if (!parserInput.$str(isRule ? '&:extend(' : ':extend(')) {\n return;\n }\n\n do {\n option = null;\n elements = null;\n while (!(option = parserInput.$re(/^(all)(?=\\s*(\\)|,))/))) {\n e = this.element();\n if (!e) {\n break;\n }\n if (elements) {\n elements.push(e);\n } else {\n elements = [ e ];\n }\n }\n\n option = option && option[1];\n if (!elements) {\n error('Missing target selector for :extend().');\n }\n extend = new(tree.Extend)(new(tree.Selector)(elements), option, index, fileInfo);\n if (extendList) {\n extendList.push(extend);\n } else {\n extendList = [ extend ];\n }\n } while (parserInput.$char(','));\n\n expect(/^\\)/);\n\n if (isRule) {\n expect(/^;/);\n }\n\n return extendList;\n },\n\n //\n // extendRule - used in a rule to extend all the parent selectors\n //\n extendRule: function() {\n return this.extend(true);\n },\n\n //\n // Mixins\n //\n mixin: {\n //\n // A Mixin call, with an optional argument list\n //\n // #mixins > .square(#fff);\n // #mixins.square(#fff);\n // .rounded(4px, black);\n // .button;\n //\n // We can lookup / return a value using the lookup syntax:\n //\n // color: #mixin.square(#fff)[@color];\n //\n // The `while` loop is there because mixins can be\n // namespaced, but we only support the child and descendant\n // selector for now.\n //\n call: function (inValue, getLookup) {\n const s = parserInput.currentChar();\n let important = false;\n let lookups;\n const index = parserInput.i;\n let elements;\n let args;\n let hasParens;\n\n if (s !== '.' && s !== '#') { return; }\n\n parserInput.save(); // stop us absorbing part of an invalid selector\n\n elements = this.elements();\n\n if (elements) {\n if (parserInput.$char('(')) {\n args = this.args(true).args;\n expectChar(')');\n hasParens = true;\n }\n\n if (getLookup !== false) {\n lookups = this.ruleLookups();\n }\n if (getLookup === true && !lookups) {\n parserInput.restore();\n return;\n }\n\n if (inValue && !lookups && !hasParens) {\n // This isn't a valid in-value mixin call\n parserInput.restore();\n return;\n }\n\n if (!inValue && parsers.important()) {\n important = true;\n }\n\n if (inValue || parsers.end()) {\n parserInput.forget();\n const mixin = new(tree.mixin.Call)(elements, args, index, fileInfo, !lookups && important);\n if (lookups) {\n return new tree.NamespaceValue(mixin, lookups);\n }\n else {\n return mixin;\n }\n }\n }\n\n parserInput.restore();\n },\n /**\n * Matching elements for mixins\n * (Start with . or # and can have > )\n */\n elements: function() {\n let elements;\n let e;\n let c;\n let elem;\n let elemIndex;\n const re = /^[#.](?:[\\w-]|\\\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/;\n while (true) {\n elemIndex = parserInput.i;\n e = parserInput.$re(re);\n \n if (!e) {\n break;\n }\n elem = new(tree.Element)(c, e, false, elemIndex, fileInfo);\n if (elements) {\n elements.push(elem);\n } else {\n elements = [ elem ];\n }\n c = parserInput.$char('>');\n }\n return elements;\n },\n args: function (isCall) {\n const entities = parsers.entities;\n const returner = { args:null, variadic: false };\n let expressions = [];\n const argsSemiColon = [];\n const argsComma = [];\n let isSemiColonSeparated;\n let expressionContainsNamed;\n let name;\n let nameLoop;\n let value;\n let arg;\n let expand;\n let hasSep = true;\n\n parserInput.save();\n\n while (true) {\n if (isCall) {\n arg = parsers.detachedRuleset() || parsers.expression();\n } else {\n parserInput.commentStore.length = 0;\n if (parserInput.$str('...')) {\n returner.variadic = true;\n if (parserInput.$char(';') && !isSemiColonSeparated) {\n isSemiColonSeparated = true;\n }\n (isSemiColonSeparated ? argsSemiColon : argsComma)\n .push({ variadic: true });\n break;\n }\n arg = entities.variable() || entities.property() || entities.literal() || entities.keyword() || this.call(true);\n }\n\n if (!arg || !hasSep) {\n break;\n }\n\n nameLoop = null;\n if (arg.throwAwayComments) {\n arg.throwAwayComments();\n }\n value = arg;\n let val = null;\n\n if (isCall) {\n // Variable\n if (arg.value && arg.value.length == 1) {\n val = arg.value[0];\n }\n } else {\n val = arg;\n }\n\n if (val && (val instanceof tree.Variable || val instanceof tree.Property)) {\n if (parserInput.$char(':')) {\n if (expressions.length > 0) {\n if (isSemiColonSeparated) {\n error('Cannot mix ; and , as delimiter types');\n }\n expressionContainsNamed = true;\n }\n\n value = parsers.detachedRuleset() || parsers.expression();\n\n if (!value) {\n if (isCall) {\n error('could not understand value for named argument');\n } else {\n parserInput.restore();\n returner.args = [];\n return returner;\n }\n }\n nameLoop = (name = val.name);\n } else if (parserInput.$str('...')) {\n if (!isCall) {\n returner.variadic = true;\n if (parserInput.$char(';') && !isSemiColonSeparated) {\n isSemiColonSeparated = true;\n }\n (isSemiColonSeparated ? argsSemiColon : argsComma)\n .push({ name: arg.name, variadic: true });\n break;\n } else {\n expand = true;\n }\n } else if (!isCall) {\n name = nameLoop = val.name;\n value = null;\n }\n }\n\n if (value) {\n expressions.push(value);\n }\n\n argsComma.push({ name:nameLoop, value, expand });\n\n if (parserInput.$char(',')) {\n hasSep = true;\n continue;\n }\n hasSep = parserInput.$char(';') === ';';\n\n if (hasSep || isSemiColonSeparated) {\n\n if (expressionContainsNamed) {\n error('Cannot mix ; and , as delimiter types');\n }\n\n isSemiColonSeparated = true;\n\n if (expressions.length > 1) {\n value = new(tree.Value)(expressions);\n }\n argsSemiColon.push({ name, value, expand });\n\n name = null;\n expressions = [];\n expressionContainsNamed = false;\n }\n }\n\n parserInput.forget();\n returner.args = isSemiColonSeparated ? argsSemiColon : argsComma;\n return returner;\n },\n //\n // A Mixin definition, with a list of parameters\n //\n // .rounded (@radius: 2px, @color) {\n // ...\n // }\n //\n // Until we have a finer grained state-machine, we have to\n // do a look-ahead, to make sure we don't have a mixin call.\n // See the `rule` function for more information.\n //\n // We start by matching `.rounded (`, and then proceed on to\n // the argument list, which has optional default values.\n // We store the parameters in `params`, with a `value` key,\n // if there is a value, such as in the case of `@radius`.\n //\n // Once we've got our params list, and a closing `)`, we parse\n // the `{...}` block.\n //\n definition: function () {\n let name;\n let params = [];\n let match;\n let ruleset;\n let cond;\n let variadic = false;\n if ((parserInput.currentChar() !== '.' && parserInput.currentChar() !== '#') ||\n parserInput.peek(/^[^{]*\\}/)) {\n return;\n }\n\n parserInput.save();\n\n match = parserInput.$re(/^([#.](?:[\\w-]|\\\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+)\\s*\\(/);\n if (match) {\n name = match[1];\n\n const argInfo = this.args(false);\n params = argInfo.args;\n variadic = argInfo.variadic;\n\n // .mixincall(\"@{a}\");\n // looks a bit like a mixin definition..\n // also\n // .mixincall(@a: {rule: set;});\n // so we have to be nice and restore\n if (!parserInput.$char(')')) {\n parserInput.restore('Missing closing \\')\\'');\n return;\n }\n\n parserInput.commentStore.length = 0;\n\n if (parserInput.$str('when')) { // Guard\n cond = expect(parsers.conditions, 'expected condition');\n }\n\n ruleset = parsers.block();\n\n if (ruleset) {\n parserInput.forget();\n return new(tree.mixin.Definition)(name, params, ruleset, cond, variadic);\n } else {\n parserInput.restore();\n }\n } else {\n parserInput.restore();\n }\n },\n \n ruleLookups: function() {\n let rule;\n let args;\n const lookups = [];\n\n if (parserInput.currentChar() !== '[') { \n return;\n }\n\n while (true) {\n parserInput.save();\n args = null;\n rule = this.lookupValue();\n if (!rule && rule !== '') {\n parserInput.restore();\n break;\n }\n lookups.push(rule);\n parserInput.forget();\n }\n if (lookups.length > 0) {\n return lookups;\n }\n },\n \n lookupValue: function() {\n parserInput.save();\n \n if (!parserInput.$char('[')) { \n parserInput.restore();\n return;\n }\n \n const name = parserInput.$re(/^(?:[@$]{0,2})[_a-zA-Z0-9-]*/);\n \n if (!parserInput.$char(']')) {\n parserInput.restore();\n return;\n } \n\n if (name || name === '') {\n parserInput.forget();\n return name;\n }\n \n parserInput.restore();\n }\n },\n //\n // Entities are the smallest recognized token,\n // and can be found inside a rule's value.\n //\n entity: function () {\n const entities = this.entities;\n\n return this.comment() || entities.literal() || entities.variable() || entities.url() ||\n entities.property() || entities.call() || entities.keyword() || this.mixin.call(true) ||\n entities.javascript();\n },\n\n //\n // A Declaration terminator. Note that we use `peek()` to check for '}',\n // because the `block` rule will be expecting it, but we still need to make sure\n // it's there, if ';' was omitted.\n //\n end: function () {\n return parserInput.$char(';') || parserInput.peek('}');\n },\n\n //\n // IE's alpha function\n //\n // alpha(opacity=88)\n //\n ieAlpha: function () {\n let value;\n\n // http://jsperf.com/case-insensitive-regex-vs-strtolower-then-regex/18\n if (!parserInput.$re(/^opacity=/i)) { return; }\n value = parserInput.$re(/^\\d+/);\n if (!value) {\n value = expect(parsers.entities.variable, 'Could not parse alpha');\n value = `@{${value.name.slice(1)}}`;\n }\n expectChar(')');\n return new tree.Quoted('', `alpha(opacity=${value})`);\n },\n\n //\n // A Selector Element\n //\n // div\n // + h1\n // #socks\n // input[type=\"text\"]\n //\n // Elements are the building blocks for Selectors,\n // they are made out of a `Combinator` (see combinator rule),\n // and an element name, such as a tag a class, or `*`.\n //\n element: function () {\n let e;\n let c;\n let v;\n const index = parserInput.i;\n\n c = this.combinator();\n\n e = parserInput.$re(/^(?:\\d+\\.\\d+|\\d+)%/) ||\n parserInput.$re(/^(?:[.#]?|:*)(?:[\\w-]|[^\\x00-\\x9f]|\\\\(?:[A-Fa-f0-9]{1,6} ?|[^A-Fa-f0-9]))+/) ||\n parserInput.$char('*') || parserInput.$char('&') || this.attribute() ||\n parserInput.$re(/^\\([^&()@]+\\)/) || parserInput.$re(/^[\\.#:](?=@)/) ||\n this.entities.variableCurly();\n\n if (!e) {\n parserInput.save();\n if (parserInput.$char('(')) {\n if ((v = this.selector(false)) && parserInput.$char(')')) {\n e = new(tree.Paren)(v);\n parserInput.forget();\n } else {\n parserInput.restore('Missing closing \\')\\'');\n }\n } else {\n parserInput.forget();\n }\n }\n\n if (e) { return new(tree.Element)(c, e, e instanceof tree.Variable, index, fileInfo); }\n },\n\n //\n // Combinators combine elements together, in a Selector.\n //\n // Because our parser isn't white-space sensitive, special care\n // has to be taken, when parsing the descendant combinator, ` `,\n // as it's an empty space. We have to check the previous character\n // in the input, to see if it's a ` ` character. More info on how\n // we deal with this in *combinator.js*.\n //\n combinator: function () {\n let c = parserInput.currentChar();\n\n if (c === '/') {\n parserInput.save();\n const slashedCombinator = parserInput.$re(/^\\/[a-z]+\\//i);\n if (slashedCombinator) {\n parserInput.forget();\n return new(tree.Combinator)(slashedCombinator);\n }\n parserInput.restore();\n }\n\n if (c === '>' || c === '+' || c === '~' || c === '|' || c === '^') {\n parserInput.i++;\n if (c === '^' && parserInput.currentChar() === '^') {\n c = '^^';\n parserInput.i++;\n }\n while (parserInput.isWhitespace()) { parserInput.i++; }\n return new(tree.Combinator)(c);\n } else if (parserInput.isWhitespace(-1)) {\n return new(tree.Combinator)(' ');\n } else {\n return new(tree.Combinator)(null);\n }\n },\n //\n // A CSS Selector\n // with less extensions e.g. the ability to extend and guard\n //\n // .class > div + h1\n // li a:hover\n //\n // Selectors are made out of one or more Elements, see above.\n //\n selector: function (isLess) {\n const index = parserInput.i;\n let elements;\n let extendList;\n let c;\n let e;\n let allExtends;\n let when;\n let condition;\n isLess = isLess !== false;\n while ((isLess && (extendList = this.extend())) || (isLess && (when = parserInput.$str('when'))) || (e = this.element())) {\n if (when) {\n condition = expect(this.conditions, 'expected condition');\n } else if (condition) {\n error('CSS guard can only be used at the end of selector');\n } else if (extendList) {\n if (allExtends) {\n allExtends = allExtends.concat(extendList);\n } else {\n allExtends = extendList;\n }\n } else {\n if (allExtends) { error('Extend can only be used at the end of selector'); }\n c = parserInput.currentChar();\n if (elements) {\n elements.push(e);\n } else {\n elements = [ e ];\n }\n e = null;\n }\n if (c === '{' || c === '}' || c === ';' || c === ',' || c === ')') {\n break;\n }\n }\n\n if (elements) { return new(tree.Selector)(elements, allExtends, condition, index, fileInfo); }\n if (allExtends) { error('Extend must be used to extend a selector, it cannot be used on its own'); }\n },\n selectors: function () {\n let s;\n let selectors;\n while (true) {\n s = this.selector();\n if (!s) {\n break;\n }\n if (selectors) {\n selectors.push(s);\n } else {\n selectors = [ s ];\n }\n parserInput.commentStore.length = 0;\n if (s.condition && selectors.length > 1) {\n error(\"Guards are only currently allowed on a single selector.\");\n }\n if (!parserInput.$char(',')) { break; }\n if (s.condition) {\n error(\"Guards are only currently allowed on a single selector.\");\n }\n parserInput.commentStore.length = 0;\n }\n return selectors;\n },\n attribute: function () {\n if (!parserInput.$char('[')) { return; }\n\n const entities = this.entities;\n let key;\n let val;\n let op;\n\n if (!(key = entities.variableCurly())) {\n key = expect(/^(?:[_A-Za-z0-9-\\*]*\\|)?(?:[_A-Za-z0-9-]|\\\\.)+/);\n }\n\n op = parserInput.$re(/^[|~*$^]?=/);\n if (op) {\n val = entities.quoted() || parserInput.$re(/^[0-9]+%/) || parserInput.$re(/^[\\w-]+/) || entities.variableCurly();\n }\n\n expectChar(']');\n\n return new(tree.Attribute)(key, op, val);\n },\n\n //\n // The `block` rule is used by `ruleset` and `mixin.definition`.\n // It's a wrapper around the `primary` rule, with added `{}`.\n //\n block: function () {\n let content;\n if (parserInput.$char('{') && (content = this.primary()) && parserInput.$char('}')) {\n return content;\n }\n },\n\n blockRuleset: function() {\n let block = this.block();\n\n if (block) {\n block = new tree.Ruleset(null, block);\n }\n return block;\n },\n\n detachedRuleset: function() {\n let argInfo;\n let params;\n let variadic;\n\n parserInput.save();\n if (parserInput.$re(/^[.#]\\(/)) {\n /**\n * DR args currently only implemented for each() function, and not \n * yet settable as `@dr: #(@arg) {}`\n * This should be done when DRs are merged with mixins.\n * See: https://github.com/less/less-meta/issues/16\n */\n argInfo = this.mixin.args(false);\n params = argInfo.args;\n variadic = argInfo.variadic;\n if (!parserInput.$char(')')) {\n parserInput.restore();\n return;\n }\n }\n const blockRuleset = this.blockRuleset();\n if (blockRuleset) {\n parserInput.forget();\n if (params) {\n return new tree.mixin.Definition(null, params, blockRuleset, null, variadic);\n }\n return new tree.DetachedRuleset(blockRuleset);\n }\n parserInput.restore();\n },\n\n //\n // div, .class, body > p {...}\n //\n ruleset: function () {\n let selectors;\n let rules;\n let debugInfo;\n\n parserInput.save();\n\n if (context.dumpLineNumbers) {\n debugInfo = getDebugInfo(parserInput.i);\n }\n\n selectors = this.selectors();\n\n if (selectors && (rules = this.block())) {\n parserInput.forget();\n const ruleset = new(tree.Ruleset)(selectors, rules, context.strictImports);\n if (context.dumpLineNumbers) {\n ruleset.debugInfo = debugInfo;\n }\n return ruleset;\n } else {\n parserInput.restore();\n }\n },\n declaration: function () {\n let name;\n let value;\n const index = parserInput.i;\n let hasDR;\n const c = parserInput.currentChar();\n let important;\n let merge;\n let isVariable;\n\n if (c === '.' || c === '#' || c === '&' || c === ':') { return; }\n\n parserInput.save();\n\n name = this.variable() || this.ruleProperty();\n if (name) {\n isVariable = typeof name === 'string';\n\n if (isVariable) {\n value = this.detachedRuleset();\n if (value) {\n hasDR = true;\n }\n }\n\n parserInput.commentStore.length = 0;\n if (!value) {\n // a name returned by this.ruleProperty() is always an array of the form:\n // [string-1, ..., string-n, \"\"] or [string-1, ..., string-n, \"+\"]\n // where each item is a tree.Keyword or tree.Variable\n merge = !isVariable && name.length > 1 && name.pop().value;\n\n // Custom property values get permissive parsing\n if (name[0].value && name[0].value.slice(0, 2) === '--') {\n value = this.permissiveValue();\n }\n // Try to store values as anonymous\n // If we need the value later we'll re-parse it in ruleset.parseValue\n else {\n value = this.anonymousValue();\n }\n if (value) {\n parserInput.forget();\n // anonymous values absorb the end ';' which is required for them to work\n return new(tree.Declaration)(name, value, false, merge, index, fileInfo);\n }\n\n if (!value) {\n value = this.value();\n }\n\n if (value) {\n important = this.important();\n } else if (isVariable) {\n // As a last resort, try permissiveValue\n value = this.permissiveValue();\n }\n }\n\n if (value && (this.end() || hasDR)) {\n parserInput.forget();\n return new(tree.Declaration)(name, value, important, merge, index, fileInfo);\n }\n else {\n parserInput.restore();\n }\n } else {\n parserInput.restore();\n }\n },\n anonymousValue: function () {\n const index = parserInput.i;\n const match = parserInput.$re(/^([^.#@\\$+\\/'\"*`(;{}-]*);/);\n if (match) {\n return new(tree.Anonymous)(match[1], index);\n }\n },\n /**\n * Used for custom properties, at-rules, and variables (as fallback)\n * Parses almost anything inside of {} [] () \"\" blocks\n * until it reaches outer-most tokens.\n * \n * First, it will try to parse comments and entities to reach\n * the end. This is mostly like the Expression parser except no\n * math is allowed.\n */\n permissiveValue: function (untilTokens) {\n let i;\n let e;\n let done;\n let value;\n const tok = untilTokens || ';';\n const index = parserInput.i;\n const result = [];\n\n function testCurrentChar() {\n const char = parserInput.currentChar();\n if (typeof tok === 'string') {\n return char === tok;\n } else {\n return tok.test(char);\n }\n }\n if (testCurrentChar()) {\n return;\n }\n value = [];\n do {\n e = this.comment();\n if (e) {\n value.push(e);\n continue;\n }\n e = this.entity();\n if (e) {\n value.push(e);\n }\n } while (e);\n\n done = testCurrentChar();\n\n if (value.length > 0) {\n value = new(tree.Expression)(value);\n if (done) {\n return value;\n }\n else {\n result.push(value);\n }\n // Preserve space before $parseUntil as it will not\n if (parserInput.prevChar() === ' ') {\n result.push(new tree.Anonymous(' ', index));\n }\n }\n parserInput.save();\n\n value = parserInput.$parseUntil(tok);\n\n if (value) {\n if (typeof value === 'string') {\n error(`Expected '${value}'`, 'Parse');\n }\n if (value.length === 1 && value[0] === ' ') {\n parserInput.forget();\n return new tree.Anonymous('', index);\n }\n let item;\n for (i = 0; i < value.length; i++) {\n item = value[i];\n if (Array.isArray(item)) {\n // Treat actual quotes as normal quoted values\n result.push(new tree.Quoted(item[0], item[1], true, index, fileInfo));\n }\n else {\n if (i === value.length - 1) {\n item = item.trim();\n }\n // Treat like quoted values, but replace vars like unquoted expressions\n const quote = new tree.Quoted('\\'', item, true, index, fileInfo);\n quote.variableRegex = /@([\\w-]+)/g;\n quote.propRegex = /\\$([\\w-]+)/g;\n result.push(quote);\n }\n }\n parserInput.forget();\n return new tree.Expression(result, true);\n }\n parserInput.restore();\n },\n\n //\n // An @import atrule\n //\n // @import \"lib\";\n //\n // Depending on our environment, importing is done differently:\n // In the browser, it's an XHR request, in Node, it would be a\n // file-system operation. The function used for importing is\n // stored in `import`, which we pass to the Import constructor.\n //\n 'import': function () {\n let path;\n let features;\n const index = parserInput.i;\n\n const dir = parserInput.$re(/^@import?\\s+/);\n\n if (dir) {\n const options = (dir ? this.importOptions() : null) || {};\n\n if ((path = this.entities.quoted() || this.entities.url())) {\n features = this.mediaFeatures();\n\n if (!parserInput.$char(';')) {\n parserInput.i = index;\n error('missing semi-colon or unrecognised media features on import');\n }\n features = features && new(tree.Value)(features);\n return new(tree.Import)(path, features, options, index, fileInfo);\n }\n else {\n parserInput.i = index;\n error('malformed import statement');\n }\n }\n },\n\n importOptions: function() {\n let o;\n const options = {};\n let optionName;\n let value;\n\n // list of options, surrounded by parens\n if (!parserInput.$char('(')) { return null; }\n do {\n o = this.importOption();\n if (o) {\n optionName = o;\n value = true;\n switch (optionName) {\n case 'css':\n optionName = 'less';\n value = false;\n break;\n case 'once':\n optionName = 'multiple';\n value = false;\n break;\n }\n options[optionName] = value;\n if (!parserInput.$char(',')) { break; }\n }\n } while (o);\n expectChar(')');\n return options;\n },\n\n importOption: function() {\n const opt = parserInput.$re(/^(less|css|multiple|once|inline|reference|optional)/);\n if (opt) {\n return opt[1];\n }\n },\n\n mediaFeature: function () {\n const entities = this.entities;\n const nodes = [];\n let e;\n let p;\n parserInput.save();\n do {\n e = entities.keyword() || entities.variable() || entities.mixinLookup();\n if (e) {\n nodes.push(e);\n } else if (parserInput.$char('(')) {\n p = this.property();\n e = this.value();\n if (parserInput.$char(')')) {\n if (p && e) {\n nodes.push(new(tree.Paren)(new(tree.Declaration)(p, e, null, null, parserInput.i, fileInfo, true)));\n } else if (e) {\n nodes.push(new(tree.Paren)(e));\n } else {\n error('badly formed media feature definition');\n }\n } else {\n error('Missing closing \\')\\'', 'Parse');\n }\n }\n } while (e);\n\n parserInput.forget();\n if (nodes.length > 0) {\n return new(tree.Expression)(nodes);\n }\n },\n\n mediaFeatures: function () {\n const entities = this.entities;\n const features = [];\n let e;\n do {\n e = this.mediaFeature();\n if (e) {\n features.push(e);\n if (!parserInput.$char(',')) { break; }\n } else {\n e = entities.variable() || entities.mixinLookup();\n if (e) {\n features.push(e);\n if (!parserInput.$char(',')) { break; }\n }\n }\n } while (e);\n\n return features.length > 0 ? features : null;\n },\n\n media: function () {\n let features;\n let rules;\n let media;\n let debugInfo;\n const index = parserInput.i;\n\n if (context.dumpLineNumbers) {\n debugInfo = getDebugInfo(index);\n }\n\n parserInput.save();\n\n if (parserInput.$str('@media')) {\n features = this.mediaFeatures();\n\n rules = this.block();\n\n if (!rules) {\n error('media definitions require block statements after any features');\n }\n\n parserInput.forget();\n\n media = new(tree.Media)(rules, features, index, fileInfo);\n if (context.dumpLineNumbers) {\n media.debugInfo = debugInfo;\n }\n\n return media;\n }\n\n parserInput.restore();\n },\n\n //\n\n // A @plugin directive, used to import plugins dynamically.\n //\n // @plugin (args) \"lib\";\n //\n plugin: function () {\n let path;\n let args;\n let options;\n const index = parserInput.i;\n const dir = parserInput.$re(/^@plugin?\\s+/);\n\n if (dir) {\n args = this.pluginArgs();\n\n if (args) {\n options = {\n pluginArgs: args,\n isPlugin: true\n };\n }\n else {\n options = { isPlugin: true };\n }\n\n if ((path = this.entities.quoted() || this.entities.url())) {\n\n if (!parserInput.$char(';')) {\n parserInput.i = index;\n error('missing semi-colon on @plugin');\n }\n return new(tree.Import)(path, null, options, index, fileInfo);\n }\n else {\n parserInput.i = index;\n error('malformed @plugin statement');\n }\n }\n },\n\n pluginArgs: function() {\n // list of options, surrounded by parens\n parserInput.save();\n if (!parserInput.$char('(')) {\n parserInput.restore();\n return null;\n }\n const args = parserInput.$re(/^\\s*([^\\);]+)\\)\\s*/);\n if (args[1]) {\n parserInput.forget();\n return args[1].trim();\n }\n else { \n parserInput.restore();\n return null;\n }\n },\n\n //\n // A CSS AtRule\n //\n // @charset \"utf-8\";\n //\n atrule: function () {\n const index = parserInput.i;\n let name;\n let value;\n let rules;\n let nonVendorSpecificName;\n let hasIdentifier;\n let hasExpression;\n let hasUnknown;\n let hasBlock = true;\n let isRooted = true;\n\n if (parserInput.currentChar() !== '@') { return; }\n\n value = this['import']() || this.plugin() || this.media();\n if (value) {\n return value;\n }\n\n parserInput.save();\n\n name = parserInput.$re(/^@[a-z-]+/);\n\n if (!name) { return; }\n\n nonVendorSpecificName = name;\n if (name.charAt(1) == '-' && name.indexOf('-', 2) > 0) {\n nonVendorSpecificName = `@${name.slice(name.indexOf('-', 2) + 1)}`;\n }\n\n switch (nonVendorSpecificName) {\n case '@charset':\n hasIdentifier = true;\n hasBlock = false;\n break;\n case '@namespace':\n hasExpression = true;\n hasBlock = false;\n break;\n case '@keyframes':\n case '@counter-style':\n hasIdentifier = true;\n break;\n case '@document':\n case '@supports':\n hasUnknown = true;\n isRooted = false;\n break;\n default:\n hasUnknown = true;\n break;\n }\n\n parserInput.commentStore.length = 0;\n\n if (hasIdentifier) {\n value = this.entity();\n if (!value) {\n error(`expected ${name} identifier`);\n }\n } else if (hasExpression) {\n value = this.expression();\n if (!value) {\n error(`expected ${name} expression`);\n }\n } else if (hasUnknown) {\n value = this.permissiveValue(/^[{;]/);\n hasBlock = (parserInput.currentChar() === '{');\n if (!value) {\n if (!hasBlock && parserInput.currentChar() !== ';') {\n error(`${name} rule is missing block or ending semi-colon`);\n }\n }\n else if (!value.value) {\n value = null;\n }\n }\n\n if (hasBlock) {\n rules = this.blockRuleset();\n }\n\n if (rules || (!hasBlock && value && parserInput.$char(';'))) {\n parserInput.forget();\n return new(tree.AtRule)(name, value, rules, index, fileInfo,\n context.dumpLineNumbers ? getDebugInfo(index) : null,\n isRooted\n );\n }\n\n parserInput.restore('at-rule options not recognised');\n },\n\n //\n // A Value is a comma-delimited list of Expressions\n //\n // font-family: Baskerville, Georgia, serif;\n //\n // In a Rule, a Value represents everything after the `:`,\n // and before the `;`.\n //\n value: function () {\n let e;\n const expressions = [];\n const index = parserInput.i;\n\n do {\n e = this.expression();\n if (e) {\n expressions.push(e);\n if (!parserInput.$char(',')) { break; }\n }\n } while (e);\n\n if (expressions.length > 0) {\n return new(tree.Value)(expressions, index);\n }\n },\n important: function () {\n if (parserInput.currentChar() === '!') {\n return parserInput.$re(/^! *important/);\n }\n },\n sub: function () {\n let a;\n let e;\n\n parserInput.save();\n if (parserInput.$char('(')) {\n a = this.addition();\n if (a && parserInput.$char(')')) {\n parserInput.forget();\n e = new(tree.Expression)([a]);\n e.parens = true;\n return e;\n }\n parserInput.restore('Expected \\')\\'');\n return;\n }\n parserInput.restore();\n },\n multiplication: function () {\n let m;\n let a;\n let op;\n let operation;\n let isSpaced;\n m = this.operand();\n if (m) {\n isSpaced = parserInput.isWhitespace(-1);\n while (true) {\n if (parserInput.peek(/^\\/[*\\/]/)) {\n break;\n }\n\n parserInput.save();\n\n op = parserInput.$char('/') || parserInput.$char('*') || parserInput.$str('./');\n\n if (!op) { parserInput.forget(); break; }\n\n a = this.operand();\n\n if (!a) { parserInput.restore(); break; }\n parserInput.forget();\n\n m.parensInOp = true;\n a.parensInOp = true;\n operation = new(tree.Operation)(op, [operation || m, a], isSpaced);\n isSpaced = parserInput.isWhitespace(-1);\n }\n return operation || m;\n }\n },\n addition: function () {\n let m;\n let a;\n let op;\n let operation;\n let isSpaced;\n m = this.multiplication();\n if (m) {\n isSpaced = parserInput.isWhitespace(-1);\n while (true) {\n op = parserInput.$re(/^[-+]\\s+/) || (!isSpaced && (parserInput.$char('+') || parserInput.$char('-')));\n if (!op) {\n break;\n }\n a = this.multiplication();\n if (!a) {\n break;\n }\n\n m.parensInOp = true;\n a.parensInOp = true;\n operation = new(tree.Operation)(op, [operation || m, a], isSpaced);\n isSpaced = parserInput.isWhitespace(-1);\n }\n return operation || m;\n }\n },\n conditions: function () {\n let a;\n let b;\n const index = parserInput.i;\n let condition;\n\n a = this.condition(true);\n if (a) {\n while (true) {\n if (!parserInput.peek(/^,\\s*(not\\s*)?\\(/) || !parserInput.$char(',')) {\n break;\n }\n b = this.condition(true);\n if (!b) {\n break;\n }\n condition = new(tree.Condition)('or', condition || a, b, index);\n }\n return condition || a;\n }\n },\n condition: function (needsParens) {\n let result;\n let logical;\n let next;\n function or() {\n return parserInput.$str('or');\n }\n\n result = this.conditionAnd(needsParens);\n if (!result) {\n return ;\n }\n logical = or();\n if (logical) {\n next = this.condition(needsParens);\n if (next) {\n result = new(tree.Condition)(logical, result, next);\n } else {\n return ;\n }\n }\n return result;\n },\n conditionAnd: function (needsParens) {\n let result;\n let logical;\n let next;\n const self = this;\n function insideCondition() {\n const cond = self.negatedCondition(needsParens) || self.parenthesisCondition(needsParens);\n if (!cond && !needsParens) {\n return self.atomicCondition(needsParens);\n }\n return cond;\n }\n function and() {\n return parserInput.$str('and');\n }\n\n result = insideCondition();\n if (!result) {\n return ;\n }\n logical = and();\n if (logical) {\n next = this.conditionAnd(needsParens);\n if (next) {\n result = new(tree.Condition)(logical, result, next);\n } else {\n return ;\n }\n }\n return result;\n },\n negatedCondition: function (needsParens) {\n if (parserInput.$str('not')) {\n const result = this.parenthesisCondition(needsParens);\n if (result) {\n result.negate = !result.negate;\n }\n return result;\n }\n },\n parenthesisCondition: function (needsParens) {\n function tryConditionFollowedByParenthesis(me) {\n let body;\n parserInput.save();\n body = me.condition(needsParens);\n if (!body) {\n parserInput.restore();\n return ;\n }\n if (!parserInput.$char(')')) {\n parserInput.restore();\n return ;\n }\n parserInput.forget();\n return body;\n }\n\n let body;\n parserInput.save();\n if (!parserInput.$str('(')) {\n parserInput.restore();\n return ;\n }\n body = tryConditionFollowedByParenthesis(this);\n if (body) {\n parserInput.forget();\n return body;\n }\n\n body = this.atomicCondition(needsParens);\n if (!body) {\n parserInput.restore();\n return ;\n }\n if (!parserInput.$char(')')) {\n parserInput.restore(`expected ')' got '${parserInput.currentChar()}'`);\n return ;\n }\n parserInput.forget();\n return body;\n },\n atomicCondition: function (needsParens) {\n const entities = this.entities;\n const index = parserInput.i;\n let a;\n let b;\n let c;\n let op;\n\n function cond() {\n return this.addition() || entities.keyword() || entities.quoted() || entities.mixinLookup();\n }\n cond = cond.bind(this);\n\n a = cond();\n if (a) {\n if (parserInput.$char('>')) {\n if (parserInput.$char('=')) {\n op = '>=';\n } else {\n op = '>';\n }\n } else\n if (parserInput.$char('<')) {\n if (parserInput.$char('=')) {\n op = '<=';\n } else {\n op = '<';\n }\n } else\n if (parserInput.$char('=')) {\n if (parserInput.$char('>')) {\n op = '=>';\n } else if (parserInput.$char('<')) {\n op = '=<';\n } else {\n op = '=';\n }\n }\n if (op) {\n b = cond();\n if (b) {\n c = new(tree.Condition)(op, a, b, index, false);\n } else {\n error('expected expression');\n }\n } else {\n c = new(tree.Condition)('=', a, new(tree.Keyword)('true'), index, false);\n }\n return c;\n }\n },\n\n //\n // An operand is anything that can be part of an operation,\n // such as a Color, or a Variable\n //\n operand: function () {\n const entities = this.entities;\n let negate;\n\n if (parserInput.peek(/^-[@\\$\\(]/)) {\n negate = parserInput.$char('-');\n }\n\n let o = this.sub() || entities.dimension() ||\n entities.color() || entities.variable() ||\n entities.property() || entities.call() ||\n entities.quoted(true) || entities.colorKeyword() ||\n entities.mixinLookup();\n\n if (negate) {\n o.parensInOp = true;\n o = new(tree.Negative)(o);\n }\n\n return o;\n },\n\n //\n // Expressions either represent mathematical operations,\n // or white-space delimited Entities.\n //\n // 1px solid black\n // @var * 2\n //\n expression: function () {\n const entities = [];\n let e;\n let delim;\n const index = parserInput.i;\n\n do {\n e = this.comment();\n if (e) {\n entities.push(e);\n continue;\n }\n e = this.addition() || this.entity();\n\n if (e instanceof tree.Comment) {\n e = null;\n }\n\n if (e) {\n entities.push(e);\n // operations do not allow keyword \"/\" dimension (e.g. small/20px) so we support that here\n if (!parserInput.peek(/^\\/[\\/*]/)) {\n delim = parserInput.$char('/');\n if (delim) {\n entities.push(new(tree.Anonymous)(delim, index));\n }\n }\n }\n } while (e);\n if (entities.length > 0) {\n return new(tree.Expression)(entities);\n }\n },\n property: function () {\n const name = parserInput.$re(/^(\\*?-?[_a-zA-Z0-9-]+)\\s*:/);\n if (name) {\n return name[1];\n }\n },\n ruleProperty: function () {\n let name = [];\n const index = [];\n let s;\n let k;\n\n parserInput.save();\n\n const simpleProperty = parserInput.$re(/^([_a-zA-Z0-9-]+)\\s*:/);\n if (simpleProperty) {\n name = [new(tree.Keyword)(simpleProperty[1])];\n parserInput.forget();\n return name;\n }\n\n function match(re) {\n const i = parserInput.i;\n const chunk = parserInput.$re(re);\n if (chunk) {\n index.push(i);\n return name.push(chunk[1]);\n }\n }\n\n match(/^(\\*?)/);\n while (true) {\n if (!match(/^((?:[\\w-]+)|(?:[@\\$]\\{[\\w-]+\\}))/)) {\n break;\n }\n }\n\n if ((name.length > 1) && match(/^((?:\\+_|\\+)?)\\s*:/)) {\n parserInput.forget();\n\n // at last, we have the complete match now. move forward,\n // convert name particles to tree objects and return:\n if (name[0] === '') {\n name.shift();\n index.shift();\n }\n for (k = 0; k < name.length; k++) {\n s = name[k];\n name[k] = (s.charAt(0) !== '@' && s.charAt(0) !== '$') ?\n new(tree.Keyword)(s) :\n (s.charAt(0) === '@' ?\n new(tree.Variable)(`@${s.slice(2, -1)}`, index[k], fileInfo) :\n new(tree.Property)(`$${s.slice(2, -1)}`, index[k], fileInfo));\n }\n return name;\n }\n parserInput.restore();\n }\n }\n };\n};\nParser.serializeVars = vars => {\n let s = '';\n\n for (const name in vars) {\n if (Object.hasOwnProperty.call(vars, name)) {\n const value = vars[name];\n s += `${((name[0] === '@') ? '' : '@') + name}: ${value}${(String(value).slice(-1) === ';') ? '' : ';'}`;\n }\n }\n\n return s;\n};\n\nexport default Parser;\n"]}
Mini Shell