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class TokenRegex { constructor(name, regexLiteral, flags) { this.name = name; this.expression = xRegExp(regexLiteral, flags); } get lastIndex() { return this.expression.lastIndex; } set lastIndex(index) { this.expression.lastIndex = index; } reset() { this.lastIndex = 0; return this; } exec(program) { let match = this.expression.exec(program); if (match !== null) { return { type: this.name, value: match[1], start: this.lastIndex - match[1].length + 1, end: this.lastIndex }; } return null; } test(program) { let savedIndex = this.lastIndex; const result = this.exec(program); this.lastIndex = savedIndex; return result !== null; } } const WHITES = new TokenRegex( "WHITE", `(\\s+| # Spaces [#;].*| # Single-line comments \\/\\*[^]*?\\*\\/ # Multiline comments )`, `yx` ); const NEWLINE = new TokenRegex( "NEWLINE", `(\\r? # Carriage return (for compatibility) \\n # Newline char )` ); const NUMBER = new TokenRegex( "NUMBER", `([-+]? # Sign \\d* # Digits \\.?\\d+ # Decimals (?:[eE][-+]?\\d+)? # Exp notatio )`, "yx" ); const STRING = new TokenRegex( "STRING", `"([^"\\\\]* # Any character except 'escaped "' )"`, "yx" ); const WORD = new TokenRegex( "WORD", `(\\[\\]| # [] is a reserved word for arrays :=| # := is a reserved word for 'define' [^\\s\\(\\)\\{\\}\\[\\]\\.,:"]+ # Avoid some chars )`, "yx" ); const LP = new TokenRegex( "LP", `([\\(\\{\\[\\.] # ({[ are synonyms )`, "yx" ); const RP = new TokenRegex( "RP", `([\\)\\}\\]] # }}] are synonyms )`, "yx" ); const COMMA = new TokenRegex( "COMMA", `(,| # comma :(?!=) # a : that isn't followed by a = (:= is word) )`, "yx" ); const REGEX = new TokenRegex( "REGEX", `(r/[^]*?/ # body of the regex [nsxAgimuy]* # flags )`, "yx" ); module.exports = { WHITES, NEWLINE, NUMBER, STRING, WORD, LP, RP, COMMA, REGEX, TokenRegex }; </code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc(1.1.0)<img src="./image/esdoc-logo-mini-black.png"></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>