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i < words.length; ++i) obj[words[i]] = true;\n    return obj;\n  }\n\n  var bodiedOps = words(\"Assert BackQuote D Defun Deriv For ForEach FromFile \" +\n                        \"FromString Function Integrate InverseTaylor Limit \" +\n                        \"LocalSymbols Macro MacroRule MacroRulePattern \" +\n                        \"NIntegrate Rule RulePattern Subst TD TExplicitSum \" +\n                        \"TSum Taylor Taylor1 Taylor2 Taylor3 ToFile \" +\n                        \"ToStdout ToString TraceRule Until While\");\n\n  // patterns\n  var pFloatForm  = \"(?:(?:\\\\.\\\\d+|\\\\d+\\\\.\\\\d*|\\\\d+)(?:[eE][+-]?\\\\d+)?)\";\n  var pIdentifier = \"(?:[a-zA-Z\\\\$'][a-zA-Z0-9\\\\$']*)\";\n\n  // regular expressions\n  var reFloatForm    = new RegExp(pFloatForm);\n  var reIdentifier   = new RegExp(pIdentifier);\n  var rePattern      = new RegExp(pIdentifier + \"?_\" + pIdentifier);\n  var reFunctionLike = new RegExp(pIdentifier + \"\\\\s*\\\\(\");\n\n  function tokenBase(stream, state) {\n    var ch;\n\n    // get next character\n    ch = stream.next();\n\n    // string\n    if (ch === '\"') {\n      state.tokenize = tokenString;\n      return state.tokenize(stream, state);\n    }\n\n    // comment\n    if (ch === '/') {\n      if (stream.eat('*')) {\n        state.tokenize = tokenComment;\n        return state.tokenize(stream, state);\n      }\n      if (stream.eat(\"/\")) {\n        stream.skipToEnd();\n        return \"comment\";\n      }\n    }\n\n    // go back one character\n    stream.backUp(1);\n\n    // update scope info\n    var m = stream.match(/^(\\w+)\\s*\\(/, false);\n    if (m !== null && bodiedOps.hasOwnProperty(m[1]))\n      state.scopes.push('bodied');\n\n    var scope = currentScope(state);\n\n    if (scope === 'bodied' && ch === '[')\n      state.scopes.pop();\n\n    if (ch === '[' || ch === '{' || ch === '(')\n      state.scopes.push(ch);\n\n    scope = currentScope(state);\n\n    if (scope === '[' && ch === ']' ||\n        scope === '{' && ch === '}' ||\n        scope === '(' && ch === ')')\n      state.scopes.pop();\n\n    if (ch === ';') {\n      while (scope === 'bodied') {\n        state.scopes.pop();\n        scope = currentScope(state);\n      }\n    }\n\n    // look for ordered rules\n    if (stream.match(/\\d+ *#/, true, false)) {\n      return 'qualifier';\n    }\n\n    // look for numbers\n    if (stream.match(reFloatForm, true, false)) {\n      return 'number';\n    }\n\n    // look for placeholders\n    if (stream.match(rePattern, true, false)) {\n      return 'variable-3';\n    }\n\n    // match all braces separately\n    if (stream.match(/(?:\\[|\\]|{|}|\\(|\\))/, true, false)) {\n      return 'bracket';\n    }\n\n    // literals looking like function calls\n    if (stream.match(reFunctionLike, true, false)) {\n      stream.backUp(1);\n      return 'variable';\n    }\n\n    // all other identifiers\n    if (stream.match(reIdentifier, true, false)) {\n      return 'variable-2';\n    }\n\n    // operators; 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