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   1  // CodeMirror, copyright (c) by Marijn Haverbeke and others
   2  // Distributed under an MIT license: https://codemirror.net/5/LICENSE
   3  
   4  (function(mod) {
   5    if (typeof exports == "object" && typeof module == "object") // CommonJS
   6      mod(require("../../lib/codemirror"));
   7    else if (typeof define == "function" && define.amd) // AMD
   8      define(["../../lib/codemirror"], mod);
   9    else // Plain browser env
  10      mod(CodeMirror);
  11  })(function(CodeMirror) {
  12  "use strict";
  13  
  14  CodeMirror.defineMode("go", function(config) {
  15    var indentUnit = config.indentUnit;
  16  
  17    var keywords = {
  18      "break":true, "case":true, "chan":true, "const":true, "continue":true,
  19      "default":true, "defer":true, "else":true, "fallthrough":true, "for":true,
  20      "func":true, "go":true, "goto":true, "if":true, "import":true,
  21      "interface":true, "map":true, "package":true, "range":true, "return":true,
  22      "select":true, "struct":true, "switch":true, "type":true, "var":true,
  23      "bool":true, "byte":true, "complex64":true, "complex128":true,
  24      "float32":true, "float64":true, "int8":true, "int16":true, "int32":true,
  25      "int64":true, "string":true, "uint8":true, "uint16":true, "uint32":true,
  26      "uint64":true, "int":true, "uint":true, "uintptr":true, "error": true,
  27      "rune":true
  28    };
  29  
  30    var atoms = {
  31      "true":true, "false":true, "iota":true, "nil":true, "append":true,
  32      "cap":true, "close":true, "complex":true, "copy":true, "delete":true, "imag":true,
  33      "len":true, "make":true, "new":true, "panic":true, "print":true,
  34      "println":true, "real":true, "recover":true
  35    };
  36  
  37    var isOperatorChar = /[+\-*&^%:=<>!|\/]/;
  38  
  39    var curPunc;
  40  
  41    function tokenBase(stream, state) {
  42      var ch = stream.next();
  43      if (ch == '"' || ch == "'" || ch == "`") {
  44        state.tokenize = tokenString(ch);
  45        return state.tokenize(stream, state);
  46      }
  47      if (/[\d\.]/.test(ch)) {
  48        if (ch == ".") {
  49          stream.match(/^[0-9]+([eE][\-+]?[0-9]+)?/);
  50        } else if (ch == "0") {
  51          stream.match(/^[xX][0-9a-fA-F]+/) || stream.match(/^0[0-7]+/);
  52        } else {
  53          stream.match(/^[0-9]*\.?[0-9]*([eE][\-+]?[0-9]+)?/);
  54        }
  55        return "number";
  56      }
  57      if (/[\[\]{}\(\),;\:\.]/.test(ch)) {
  58        curPunc = ch;
  59        return null;
  60      }
  61      if (ch == "/") {
  62        if (stream.eat("*")) {
  63          state.tokenize = tokenComment;
  64          return tokenComment(stream, state);
  65        }
  66        if (stream.eat("/")) {
  67          stream.skipToEnd();
  68          return "comment";
  69        }
  70      }
  71      if (isOperatorChar.test(ch)) {
  72        stream.eatWhile(isOperatorChar);
  73        return "operator";
  74      }
  75      stream.eatWhile(/[\w\$_\xa1-\uffff]/);
  76      var cur = stream.current();
  77      if (keywords.propertyIsEnumerable(cur)) {
  78        if (cur == "case" || cur == "default") curPunc = "case";
  79        return "keyword";
  80      }
  81      if (atoms.propertyIsEnumerable(cur)) return "atom";
  82      return "variable";
  83    }
  84  
  85    function tokenString(quote) {
  86      return function(stream, state) {
  87        var escaped = false, next, end = false;
  88        while ((next = stream.next()) != null) {
  89          if (next == quote && !escaped) {end = true; break;}
  90          escaped = !escaped && quote != "`" && next == "\\";
  91        }
  92        if (end || !(escaped || quote == "`"))
  93          state.tokenize = tokenBase;
  94        return "string";
  95      };
  96    }
  97  
  98    function tokenComment(stream, state) {
  99      var maybeEnd = false, ch;
 100      while (ch = stream.next()) {
 101        if (ch == "/" && maybeEnd) {
 102          state.tokenize = tokenBase;
 103          break;
 104        }
 105        maybeEnd = (ch == "*");
 106      }
 107      return "comment";
 108    }
 109  
 110    function Context(indented, column, type, align, prev) {
 111      this.indented = indented;
 112      this.column = column;
 113      this.type = type;
 114      this.align = align;
 115      this.prev = prev;
 116    }
 117    function pushContext(state, col, type) {
 118      return state.context = new Context(state.indented, col, type, null, state.context);
 119    }
 120    function popContext(state) {
 121      if (!state.context.prev) return;
 122      var t = state.context.type;
 123      if (t == ")" || t == "]" || t == "}")
 124        state.indented = state.context.indented;
 125      return state.context = state.context.prev;
 126    }
 127  
 128    // Interface
 129  
 130    return {
 131      startState: function(basecolumn) {
 132        return {
 133          tokenize: null,
 134          context: new Context((basecolumn || 0) - indentUnit, 0, "top", false),
 135          indented: 0,
 136          startOfLine: true
 137        };
 138      },
 139  
 140      token: function(stream, state) {
 141        var ctx = state.context;
 142        if (stream.sol()) {
 143          if (ctx.align == null) ctx.align = false;
 144          state.indented = stream.indentation();
 145          state.startOfLine = true;
 146          if (ctx.type == "case") ctx.type = "}";
 147        }
 148        if (stream.eatSpace()) return null;
 149        curPunc = null;
 150        var style = (state.tokenize || tokenBase)(stream, state);
 151        if (style == "comment") return style;
 152        if (ctx.align == null) ctx.align = true;
 153  
 154        if (curPunc == "{") pushContext(state, stream.column(), "}");
 155        else if (curPunc == "[") pushContext(state, stream.column(), "]");
 156        else if (curPunc == "(") pushContext(state, stream.column(), ")");
 157        else if (curPunc == "case") ctx.type = "case";
 158        else if (curPunc == "}" && ctx.type == "}") popContext(state);
 159        else if (curPunc == ctx.type) popContext(state);
 160        state.startOfLine = false;
 161        return style;
 162      },
 163  
 164      indent: function(state, textAfter) {
 165        if (state.tokenize != tokenBase && state.tokenize != null) return CodeMirror.Pass;
 166        var ctx = state.context, firstChar = textAfter && textAfter.charAt(0);
 167        if (ctx.type == "case" && /^(?:case|default)\b/.test(textAfter)) {
 168          state.context.type = "}";
 169          return ctx.indented;
 170        }
 171        var closing = firstChar == ctx.type;
 172        if (ctx.align) return ctx.column + (closing ? 0 : 1);
 173        else return ctx.indented + (closing ? 0 : indentUnit);
 174      },
 175  
 176      electricChars: "{}):",
 177      closeBrackets: "()[]{}''\"\"``",
 178      fold: "brace",
 179      blockCommentStart: "/*",
 180      blockCommentEnd: "*/",
 181      lineComment: "//"
 182    };
 183  });
 184  
 185  CodeMirror.defineMIME("text/x-go", "go");
 186  
 187  });