makefile.js

/*
 *  This file is part of CoCalc: Copyright © 2020 Sagemath, Inc.
 *  License: MS-RSL – see LICENSE.md for details
 */

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE
// derived from https://github.com/notepadqq/CodeMirror/blob/d790fc39c1a5f06aa66415110b8ebe3026df665a/mode/makefile/makefile.js

import * as CodeMirror from "codemirror";

CodeMirror.defineMode('makefile', function() {

  var words = {};

  function tokenBase(stream, state) {
    if (stream.eatSpace()) return null;

    var sol = stream.sol();
    var ch = stream.next();
    var cur = stream.current();

    if (ch === '@') { return "atom"; }

    if (sol) {

      if (ch === '#') {
        if (stream.eat('!')) {
          stream.skipToEnd();
          return 'meta';
        }
        stream.skipToEnd();
        return 'tag';
      }

      // if, ifdef, ifndef, ifeq, ifneq
      if (ch === 'i' && (stream.match('f ') || stream.match('fdef ') || stream.match('fndef ') || stream.match('feq (') || stream.match('fneq ('))) {
        stream.skipToEnd();
        return "bracket";
      }
      // else, endif
      if (ch === 'e' && (stream.match('lse') || stream.match('ndif'))) { return "bracket"; }
      // include
      if (ch === 'i' && stream.match('nclude ')) { return "string"; }
      // -include
      if (ch === '-' && stream.match('include ')) { return "string"; }
      // vpath
      if (ch === 'v' && stream.match('path ')) { return "string"; }

      // makros
      if ((stream.match(/^[\w]+[\s]+/) || stream.match(/^[\w]+/)) &&
         (stream.peek() === '=' ||
         ((stream.match('?') || stream.match('+') || stream.match('-')) && stream.peek() === '='))
         ) { return "variable-2"; }

      // Makefile targets
      if ( stream.eat(':') || stream.match(/^[\w]+:/) || stream.match(/^(.)+[\w]+:/) ||
          (ch === '$' && stream.match(/^\(+[\w]+\)+/) && stream.eat(':'))
         ) {
        if (stream.peek() === '=') {
          return "variable-2";
        } else {
          return "header";
        }
      }

    } else {

      if (ch === '*') { return "quote"; }
      if (ch === '%') { return 'atom'; }
      if (ch === '\\' && stream.eol()) { return "comment"; }
      if (ch === '#') {
        stream.skipToEnd();
        return 'tag';
      }

      if ((stream.eat(':') || stream.eat('+')) && stream.peek('=')) { return "variable-2"; }

      if (ch === '$' && stream.eat('$') && stream.match(/^[\w]+/)) { return "variable-2"; }
      if (ch === '$' && stream.eat('(')) {
        state.tokens.unshift(tokenDollar);
        return tokenize(stream, state);
      }
      if (ch === '$' && stream.eat('{')) {
        state.tokens.unshift(tokenDollarB);
        return tokenize(stream, state);
      }
      if (ch === '$' && (stream.eat('@') || stream.eat('<') || stream.eat('^'))) { return "quote"; }

      if (ch === '\'' || ch === '"' || ch === '`') {
        state.tokens.unshift(tokenString(ch));
        return tokenize(stream, state);
      }
    }

    stream.eatWhile(/[\w-]/);
    return words.hasOwnProperty(cur) ? words[cur] : null;
  }

  function tokenString(quote) {
    return function(stream, state) {
      var next, end = false, escaped = false;
      while ((next = stream.next()) != null) {
        if (next === quote && !escaped) {
          end = true;
          break;
        }
      }
      if (end || !escaped) {
        state.tokens.shift();
      }
      return ((quote === ')' || quote === '}') ? 'variable-2' : 'string');
    };
  };

  var tokenDollar = function(stream, state) {
    if (state.tokens.length > 1) stream.eat('$');
    state.tokens[0] = tokenString(')');
    return tokenize(stream, state);
  };
  var tokenDollarB = function(stream, state) {
    if (state.tokens.length > 1) stream.eat('$');
    state.tokens[0] = tokenString('}');
    return tokenize(stream, state);
  };

  function tokenize(stream, state) {
    return (state.tokens[0] || tokenBase) (stream, state);
  };

  return {
    startState: function() {return {tokens:[]};},
    token: function(stream, state) {
      return tokenize(stream, state);
    },
  lineComment: "#"
  };
});

CodeMirror.defineMIME('text/x-makefile', 'makefile');