text: // CodeMirror, copyright (c) by Marijn Haverbeke and others
  // Distributed under an MIT license: https://codemirror.net/LICENSE
  
  // Yacas mode copyright (c) 2015 by Grzegorz Mazur
  // Loosely based on mathematica mode by Calin Barbat
  
  (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('yacas', function(_config, _parserConfig) {
  
    function words(str) {
      var obj = {}, words = str.split(" ");
      for (var i = 0; i < words.length; ++i) obj[words[i]] = true;
      return obj;
    }
  
    var bodiedOps = words("Assert BackQuote D Defun Deriv For ForEach FromFile " +
                          "FromString Function Integrate InverseTaylor Limit " +
                          "LocalSymbols Macro MacroRule MacroRulePattern " +
                          "NIntegrate Rule RulePattern Subst TD TExplicitSum " +
                          "TSum Taylor Taylor1 Taylor2 Taylor3 ToFile " +
                          "ToStdout ToString TraceRule Until While");
  
    // patterns
    var pFloatForm  = "(?:(?:\\.\\d+|\\d+\\.\\d*|\\d+)(?:[eE][+-]?\\d+)?)";
    var pIdentifier = "(?:[a-zA-Z\\$'][a-zA-Z0-9\\$']*)";
  
    // regular expressions
    var reFloatForm    = new RegExp(pFloatForm);
    var reIdentifier   = new RegExp(pIdentifier);
    var rePattern      = new RegExp(pIdentifier + "?_" + pIdentifier);
    var reFunctionLike = new RegExp(pIdentifier + "\\s*\\(");
  
    function tokenBase(stream, state) {
      var ch;
  
      // get next character
      ch = stream.next();
  
      // string
      if (ch === '"') {
        state.tokenize = tokenString;
        return state.tokenize(stream, state);
      }
  
      // comment
      if (ch === '/') {
        if (stream.eat('*')) {
          state.tokenize = tokenComment;
          return state.tokenize(stream, state);
        }
        if (stream.eat("/")) {
          stream.skipToEnd();
          return "comment";
        }
      }
  
      // go back one character
      stream.backUp(1);
  
      // update scope info
      var m = stream.match(/^(\w+)\s*\(/, false);
      if (m !== null && bodiedOps.hasOwnProperty(m[1]))
        state.scopes.push('bodied');
  
      var scope = currentScope(state);
  
      if (scope === 'bodied' && ch === '[')
        state.scopes.pop();
  
      if (ch === '[' || ch === '{' || ch === '(')
        state.scopes.push(ch);
  
      scope = currentScope(state);
  
      if (scope === '[' && ch === ']' ||
          scope === '{' && ch === '}' ||
          scope === '(' && ch === ')')
        state.scopes.pop();
  
      if (ch === ';') {
        while (scope === 'bodied') {
          state.scopes.pop();
          scope = currentScope(state);
        }
      }
  
      // look for ordered rules
      if (stream.match(/\d+ *#/, true, false)) {
        return 'qualifier';
      }
  
      // look for numbers
      if (stream.match(reFloatForm, true, false)) {
        return 'number';
      }
  
      // look for placeholders
      if (stream.match(rePattern, true, false)) {
        return 'variable-3';
      }
  
      // match all braces separately
      if (stream.match(/(?:\[|\]|{|}|\(|\))/, true, false)) {
        return 'bracket';
      }
  
      // literals looking like function calls
      if (stream.match(reFunctionLike, true, false)) {
        stream.backUp(1);
        return 'variable';
      }
  
      // all other identifiers
      if (stream.match(reIdentifier, true, false)) {
        return 'variable-2';
      }
  
      // operators; note that operators like @@ or /; are matched separately for each symbol.
      if (stream.match(/(?:\\|\+|\-|\*|\/|,|;|\.|:|@|~|=|>|<|&|\||_|`|'|\^|\?|!|%|#)/, true, false)) {
        return 'operator';
      }
  
      // everything else is an error
      return 'error';
    }
  
    function tokenString(stream, state) {
      var next, end = false, escaped = false;
      while ((next = stream.next()) != null) {
        if (next === '"' && !escaped) {
          end = true;
          break;
        }
        escaped = !escaped && next === '\\';
      }
      if (end && !escaped) {
        state.tokenize = tokenBase;
      }
      return 'string';
    };
  
    function tokenComment(stream, state) {
      var prev, next;
      while((next = stream.next()) != null) {
        if (prev === '*' && next === '/') {
          state.tokenize = tokenBase;
          break;
        }
        prev = next;
      }
      return 'comment';
    }
  
    function currentScope(state) {
      var scope = null;
      if (state.scopes.length > 0)
        scope = state.scopes[state.scopes.length - 1];
      return scope;
    }
  
    return {
      startState: function() {
        return {
          tokenize: tokenBase,
          scopes: []
        };
      },
      token: function(stream, state) {
        if (stream.eatSpace()) return null;
        return state.tokenize(stream, state);
      },
      indent: function(state, textAfter) {
        if (state.tokenize !== tokenBase && state.tokenize !== null)
          return CodeMirror.Pass;
  
        var delta = 0;
        if (textAfter === ']' || textAfter === '];' ||
            textAfter === '}' || textAfter === '};' ||
            textAfter === ');')
          delta = -1;
  
        return (state.scopes.length + delta) * _config.indentUnit;
      },
      electricChars: "{}[]();",
      blockCommentStart: "/*",
      blockCommentEnd: "*/",
      lineComment: "//"
    };
  });
  
  CodeMirror.defineMIME('text/x-yacas', {
    name: 'yacas'
  });
  
  });
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