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{ Next, ToString } from \"./types\";\nimport { quoteKey, isValidVariableName } from \"./quote\";\n\n/**\n * Used in function stringification.\n */\n/* istanbul ignore next */\nconst METHOD_NAMES_ARE_QUOTED =\n {\n \" \"() {\n /* Empty. */\n },\n }[\" \"]\n .toString()\n .charAt(0) === '\"';\n\nconst FUNCTION_PREFIXES = {\n Function: \"function \",\n GeneratorFunction: \"function* \",\n AsyncFunction: \"async function \",\n AsyncGeneratorFunction: \"async function* \",\n};\n\nconst METHOD_PREFIXES = {\n Function: \"\",\n GeneratorFunction: \"*\",\n AsyncFunction: \"async \",\n AsyncGeneratorFunction: \"async *\",\n};\n\nconst TOKENS_PRECEDING_REGEXPS = new Set(\n (\n \"case delete else in instanceof new return throw typeof void \" +\n \", ; : + - ! ~ & | ^ * / % < > ? =\"\n ).split(\" \")\n);\n\n/**\n * Track function parser usage.\n */\nexport const USED_METHOD_KEY = new WeakSet<(...args: unknown[]) => unknown>();\n\n/**\n * Stringify a function.\n */\nexport const functionToString: ToString = (fn, space, next, key) => {\n const name = typeof key === \"string\" ? key : undefined;\n\n // Track in function parser for object stringify to avoid duplicate output.\n if (name !== undefined) USED_METHOD_KEY.add(fn);\n\n return new FunctionParser(fn, space, next, name).stringify();\n};\n\n/**\n * Rewrite a stringified function to remove initial indentation.\n */\nexport function dedentFunction(fnString: string) {\n let found: string | undefined;\n\n for (const line of fnString.split(\"\\n\").slice(1)) {\n const m = /^[\\s\\t]+/.exec(line);\n if (!m) return fnString; // Early exit without indent.\n\n const [str] = m;\n\n if (found === undefined) found = str;\n else if (str.length < found.length) found = str;\n }\n\n return found ? fnString.split(`\\n${found}`).join(\"\\n\") : fnString;\n}\n\n/**\n * Function parser and stringify.\n */\nexport class FunctionParser {\n fnString: string;\n fnType: keyof typeof FUNCTION_PREFIXES;\n keyQuote: string | undefined;\n keyPrefix: string;\n isMethodCandidate: boolean;\n\n pos = 0;\n hadKeyword = false;\n\n constructor(\n public fn: (...args: unknown[]) => unknown,\n public indent: string,\n public next: Next,\n public key?: string\n ) {\n this.fnString = Function.prototype.toString.call(fn);\n this.fnType = fn.constructor.name as keyof typeof FUNCTION_PREFIXES;\n this.keyQuote = key === undefined ? \"\" : quoteKey(key, next);\n this.keyPrefix =\n key === undefined ? \"\" : `${this.keyQuote}:${indent ? \" \" : \"\"}`;\n this.isMethodCandidate =\n key === undefined ? false : this.fn.name === \"\" || this.fn.name === key;\n }\n\n stringify() {\n const value = this.tryParse();\n\n // If we can't stringify this function, return a void expression; for\n // bonus help with debugging, include the function as a string literal.\n if (!value) {\n return `${this.keyPrefix}void ${this.next(this.fnString)}`;\n }\n\n return dedentFunction(value);\n }\n\n getPrefix() {\n if (this.isMethodCandidate && !this.hadKeyword) {\n return METHOD_PREFIXES[this.fnType] + this.keyQuote;\n }\n\n return this.keyPrefix + FUNCTION_PREFIXES[this.fnType];\n }\n\n tryParse() {\n if (this.fnString[this.fnString.length - 1] !== \"}\") {\n // Must be an arrow function.\n return this.keyPrefix + this.fnString;\n }\n\n // Attempt to remove function prefix.\n if (this.fn.name) {\n const result = this.tryStrippingName();\n if (result) return result;\n }\n\n // Support class expressions.\n const prevPos = this.pos;\n if (this.consumeSyntax() === \"class\") return this.fnString;\n this.pos = prevPos;\n\n if (this.tryParsePrefixTokens()) {\n const result = this.tryStrippingName();\n if (result) return result;\n\n let offset = this.pos;\n\n switch (this.consumeSyntax(\"WORD_LIKE\")) {\n case \"WORD_LIKE\":\n if (this.isMethodCandidate && !this.hadKeyword) {\n offset = this.pos;\n }\n case \"()\":\n if (this.fnString.substr(this.pos, 2) === \"=>\") {\n return this.keyPrefix + this.fnString;\n }\n\n this.pos = offset;\n case '\"':\n case \"'\":\n case \"[]\":\n return this.getPrefix() + this.fnString.substr(this.pos);\n }\n }\n }\n\n /**\n * Attempt to parse the function from the current position by first stripping\n * the function's name from the front. This is not a fool-proof method on all\n * JavaScript engines, but yields good results on Node.js 4 (and slightly\n * less good results on Node.js 6 and 8).\n */\n tryStrippingName() {\n if (METHOD_NAMES_ARE_QUOTED) {\n // ... then this approach is unnecessary and yields false positives.\n return;\n }\n\n let start = this.pos;\n const prefix = this.fnString.substr(this.pos, this.fn.name.length);\n\n if (prefix === this.fn.name) {\n this.pos += prefix.length;\n\n if (\n this.consumeSyntax() === \"()\" &&\n this.consumeSyntax() === \"{}\" &&\n this.pos === this.fnString.length\n ) {\n // Don't include the function's name if it will be included in the\n // prefix, or if it's invalid as a name in a function expression.\n if (this.isMethodCandidate || !isValidVariableName(prefix)) {\n start += prefix.length;\n }\n\n return this.getPrefix() + this.fnString.substr(start);\n }\n }\n\n this.pos = start;\n }\n\n /**\n * Attempt to advance the parser past the keywords expected to be at the\n * start of this function's definition. This method sets `this.hadKeyword`\n * based on whether or not a `function` keyword is consumed.\n */\n tryParsePrefixTokens(): boolean {\n let posPrev = this.pos;\n\n this.hadKeyword = false;\n\n switch (this.fnType) {\n case \"AsyncFunction\":\n if (this.consumeSyntax() !== \"async\") return false;\n\n posPrev = this.pos;\n case \"Function\":\n if (this.consumeSyntax() === \"function\") {\n this.hadKeyword = true;\n } else {\n this.pos = posPrev;\n }\n return true;\n case \"AsyncGeneratorFunction\":\n if (this.consumeSyntax() !== \"async\") return false;\n case \"GeneratorFunction\":\n let token = this.consumeSyntax();\n\n if (token === \"function\") {\n token = this.consumeSyntax();\n this.hadKeyword = true;\n }\n\n return token === \"*\";\n }\n }\n\n /**\n * Advance the parser past one element of JavaScript syntax. This could be a\n * matched pair of delimiters, like braces or parentheses, or an atomic unit\n * like a keyword, variable, or operator. Return a normalized string\n * representation of the element parsed--for example, returns '{}' for a\n * matched pair of braces. Comments and whitespace are skipped.\n *\n * (This isn't a full parser, so the token scanning logic used here is as\n * simple as it can be. As a consequence, some things that are one token in\n * JavaScript, like decimal number literals or most multi-character operators\n * like '&&', are split into more than one token here. However, awareness of\n * some multi-character sequences like '=>' is necessary, so we match the few\n * of them that we care about.)\n */\n consumeSyntax(wordLikeToken?: string) {\n const m = this.consumeMatch(\n /^(?:([A-Za-z_0-9$\\xA0-\\uFFFF]+)|=>|\\+\\+|\\-\\-|.)/\n );\n\n if (!m) return;\n\n const [token, match] = m;\n this.consumeWhitespace();\n\n if (match) return wordLikeToken || match;\n\n switch (token) {\n case \"(\":\n return this.consumeSyntaxUntil(\"(\", \")\");\n case \"[\":\n return this.consumeSyntaxUntil(\"[\", \"]\");\n case \"{\":\n return this.consumeSyntaxUntil(\"{\", \"}\");\n case \"`\":\n return this.consumeTemplate();\n case '\"':\n return this.consumeRegExp(/^(?:[^\\\\\"]|\\\\.)*\"/, '\"');\n case \"'\":\n return this.consumeRegExp(/^(?:[^\\\\']|\\\\.)*'/, \"'\");\n }\n\n return token;\n }\n\n consumeSyntaxUntil(startToken: string, endToken: string): string | undefined {\n let isRegExpAllowed = true;\n\n for (;;) {\n const token = this.consumeSyntax();\n if (token === endToken) return startToken + endToken;\n if (!token || token === \")\" || token === \"]\" || token === \"}\") return;\n\n if (\n token === \"/\" &&\n isRegExpAllowed &&\n this.consumeMatch(/^(?:\\\\.|[^\\\\\\/\\n[]|\\[(?:\\\\.|[^\\]])*\\])+\\/[a-z]*/)\n ) {\n isRegExpAllowed = false;\n this.consumeWhitespace();\n } else {\n isRegExpAllowed = TOKENS_PRECEDING_REGEXPS.has(token);\n }\n }\n }\n\n consumeMatch(re: RegExp) {\n const m = re.exec(this.fnString.substr(this.pos));\n if (m) this.pos += m[0].length;\n return m;\n }\n\n /**\n * Advance the parser past an arbitrary regular expression. Return `token`,\n * or the match object of the regexp.\n */\n consumeRegExp(re: RegExp, token: string): string | undefined {\n const m = re.exec(this.fnString.substr(this.pos));\n if (!m) return;\n this.pos += m[0].length;\n this.consumeWhitespace();\n return token;\n }\n\n /**\n * Advance the parser past a template string.\n */\n consumeTemplate() {\n for (;;) {\n this.consumeMatch(/^(?:[^`$\\\\]|\\\\.|\\$(?!{))*/);\n\n if (this.fnString[this.pos] === \"`\") {\n this.pos++;\n this.consumeWhitespace();\n return \"`\";\n }\n\n if (this.fnString.substr(this.pos, 2) === \"${\") {\n this.pos += 2;\n this.consumeWhitespace();\n\n if (this.consumeSyntaxUntil(\"{\", \"}\")) continue;\n }\n\n return;\n }\n }\n\n /**\n * Advance the parser past any whitespace or comments.\n */\n consumeWhitespace() {\n this.consumeMatch(/^(?:\\s|\\/\\/.*|\\/\\*[^]*?\\*\\/)*/);\n }\n}\n"]} |