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index.html 0000644 00000004612 15030252327 0006543 0 ustar 00 <!doctype html> <html> <head> <title>CodeMirror: EBNF Mode</title> <meta charset="utf-8"/> <link rel=stylesheet href="../../doc/docs.css"> <link rel="stylesheet" href="../../lib/codemirror.css"> <script src="../../lib/codemirror.js"></script> <script src="../javascript/javascript.js"></script> <script src="ebnf.js"></script> <style>.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style> </head> <body> <div id=nav> <a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a> <ul> <li><a href="../../index.html">Home</a> <li><a href="../../doc/manual.html">Manual</a> <li><a href="https://github.com/codemirror/codemirror">Code</a> </ul> <ul> <li><a href="../index.html">Language modes</a> <li><a class=active href="#">EBNF Mode</a> </ul> </div> <article> <h2>EBNF Mode (bracesMode setting = "javascript")</h2> <form><textarea id="code" name="code"> /* description: Parses end executes mathematical expressions. */ /* lexical grammar */ %lex %% \s+ /* skip whitespace */ [0-9]+("."[0-9]+)?\b return 'NUMBER'; "*" return '*'; "/" return '/'; "-" return '-'; "+" return '+'; "^" return '^'; "(" return '('; ")" return ')'; "PI" return 'PI'; "E" return 'E'; <<EOF>> return 'EOF'; /lex /* operator associations and precedence */ %left '+' '-' %left '*' '/' %left '^' %left UMINUS %start expressions %% /* language grammar */ expressions : e EOF {print($1); return $1;} ; e : e '+' e {$$ = $1+$3;} | e '-' e {$$ = $1-$3;} | e '*' e {$$ = $1*$3;} | e '/' e {$$ = $1/$3;} | e '^' e {$$ = Math.pow($1, $3);} | '-' e %prec UMINUS {$$ = -$2;} | '(' e ')' {$$ = $2;} | NUMBER {$$ = Number(yytext);} | E {$$ = Math.E;} | PI {$$ = Math.PI;} ;</textarea></form> <script> var editor = CodeMirror.fromTextArea(document.getElementById("code"), { mode: {name: "ebnf"}, lineNumbers: true, bracesMode: 'javascript' }); </script> <h3>The EBNF Mode</h3> <p> Created by <a href="https://github.com/robertleeplummerjr">Robert Plummer</a></p> </article> </body> </html> ebnf.js 0000644 00000013706 15030252327 0006022 0 ustar 00 // CodeMirror, copyright (c) by Marijn Haverbeke and others // Distributed under an MIT license: https://codemirror.net/LICENSE (function(mod) { if (typeof exports == "object" && typeof module == "object") // CommonJS mod(require("../../lib/codemirror")); else if (typeof define == "function" && define.amd) // AMD define(["../../lib/codemirror"], mod); else // Plain browser env mod(CodeMirror); })(function(CodeMirror) { "use strict"; CodeMirror.defineMode("ebnf", function (config) { var commentType = {slash: 0, parenthesis: 1}; var stateType = {comment: 0, _string: 1, characterClass: 2}; var bracesMode = null; if (config.bracesMode) bracesMode = CodeMirror.getMode(config, config.bracesMode); return { startState: function () { return { stringType: null, commentType: null, braced: 0, lhs: true, localState: null, stack: [], inDefinition: false }; }, token: function (stream, state) { if (!stream) return; //check for state changes if (state.stack.length === 0) { //strings if ((stream.peek() == '"') || (stream.peek() == "'")) { state.stringType = stream.peek(); stream.next(); // Skip quote state.stack.unshift(stateType._string); } else if (stream.match(/^\/\*/)) { //comments starting with /* state.stack.unshift(stateType.comment); state.commentType = commentType.slash; } else if (stream.match(/^\(\*/)) { //comments starting with (* state.stack.unshift(stateType.comment); state.commentType = commentType.parenthesis; } } //return state //stack has switch (state.stack[0]) { case stateType._string: while (state.stack[0] === stateType._string && !stream.eol()) { if (stream.peek() === state.stringType) { stream.next(); // Skip quote state.stack.shift(); // Clear flag } else if (stream.peek() === "\\") { stream.next(); stream.next(); } else { stream.match(/^.[^\\\"\']*/); } } return state.lhs ? "property string" : "string"; // Token style case stateType.comment: while (state.stack[0] === stateType.comment && !stream.eol()) { if (state.commentType === commentType.slash && stream.match(/\*\//)) { state.stack.shift(); // Clear flag state.commentType = null; } else if (state.commentType === commentType.parenthesis && stream.match(/\*\)/)) { state.stack.shift(); // Clear flag state.commentType = null; } else { stream.match(/^.[^\*]*/); } } return "comment"; case stateType.characterClass: while (state.stack[0] === stateType.characterClass && !stream.eol()) { if (!(stream.match(/^[^\]\\]+/) || stream.match(/^\\./))) { state.stack.shift(); } } return "operator"; } var peek = stream.peek(); if (bracesMode !== null && (state.braced || peek === "{")) { if (state.localState === null) state.localState = CodeMirror.startState(bracesMode); var token = bracesMode.token(stream, state.localState), text = stream.current(); if (!token) { for (var i = 0; i < text.length; i++) { if (text[i] === "{") { if (state.braced === 0) { token = "matchingbracket"; } state.braced++; } else if (text[i] === "}") { state.braced--; if (state.braced === 0) { token = "matchingbracket"; } } } } return token; } //no stack switch (peek) { case "[": stream.next(); state.stack.unshift(stateType.characterClass); return "bracket"; case ":": case "|": case ";": stream.next(); return "operator"; case "%": if (stream.match("%%")) { return "header"; } else if (stream.match(/[%][A-Za-z]+/)) { return "keyword"; } else if (stream.match(/[%][}]/)) { return "matchingbracket"; } break; case "/": if (stream.match(/[\/][A-Za-z]+/)) { return "keyword"; } case "\\": if (stream.match(/[\][a-z]+/)) { return "string-2"; } case ".": if (stream.match(".")) { return "atom"; } case "*": case "-": case "+": case "^": if (stream.match(peek)) { return "atom"; } case "$": if (stream.match("$$")) { return "builtin"; } else if (stream.match(/[$][0-9]+/)) { return "variable-3"; } case "<": if (stream.match(/<<[a-zA-Z_]+>>/)) { return "builtin"; } } if (stream.match(/^\/\//)) { stream.skipToEnd(); return "comment"; } else if (stream.match(/return/)) { return "operator"; } else if (stream.match(/^[a-zA-Z_][a-zA-Z0-9_]*/)) { if (stream.match(/(?=[\(.])/)) { return "variable"; } else if (stream.match(/(?=[\s\n]*[:=])/)) { return "def"; } return "variable-2"; } else if (["[", "]", "(", ")"].indexOf(stream.peek()) != -1) { stream.next(); return "bracket"; } else if (!stream.eatSpace()) { stream.next(); } return null; } }; }); CodeMirror.defineMIME("text/x-ebnf", "ebnf"); });
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