text: ﻿// CodeMirror, copyright (c) by Marijn Haverbeke and others
  // Distributed under an MIT license: http://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) {
    var DEFAULT_BRACKETS = "()[]{}''\"\"";
    var DEFAULT_TRIPLES = "'\"";
    var DEFAULT_EXPLODE_ON_ENTER = "[]{}";
    var SPACE_CHAR_REGEX = /\s/;
  
    var Pos = CodeMirror.Pos;
  
    CodeMirror.defineOption("autoCloseBrackets", false, function(cm, val, old) {
      if (old != CodeMirror.Init && old)
        cm.removeKeyMap("autoCloseBrackets");
      if (!val) return;
      var pairs = DEFAULT_BRACKETS, triples = DEFAULT_TRIPLES, explode = DEFAULT_EXPLODE_ON_ENTER;
      if (typeof val == "string") pairs = val;
      else if (typeof val == "object") {
        if (val.pairs != null) pairs = val.pairs;
        if (val.triples != null) triples = val.triples;
        if (val.explode != null) explode = val.explode;
      }
      var map = buildKeymap(pairs, triples);
      if (explode) map.Enter = buildExplodeHandler(explode);
      cm.addKeyMap(map);
    });
  
    function charsAround(cm, pos) {
      var str = cm.getRange(Pos(pos.line, pos.ch - 1),
                            Pos(pos.line, pos.ch + 1));
      return str.length == 2 ? str : null;
    }
  
    // Project the token type that will exists after the given char is
    // typed, and use it to determine whether it would cause the start
    // of a string token.
    function enteringString(cm, pos, ch) {
      var line = cm.getLine(pos.line);
      var token = cm.getTokenAt(pos);
      if (/\bstring2?\b/.test(token.type)) return false;
      var stream = new CodeMirror.StringStream(line.slice(0, pos.ch) + ch + line.slice(pos.ch), 4);
      stream.pos = stream.start = token.start;
      for (;;) {
        var type1 = cm.getMode().token(stream, token.state);
        if (stream.pos >= pos.ch + 1) return /\bstring2?\b/.test(type1);
        stream.start = stream.pos;
      }
    }
  
    function buildKeymap(pairs, triples) {
      var map = {
        name : "autoCloseBrackets",
        Backspace: function(cm) {
          if (cm.getOption("disableInput")) return CodeMirror.Pass;
          var ranges = cm.listSelections();
          for (var i = 0; i < ranges.length; i++) {
            if (!ranges[i].empty()) return CodeMirror.Pass;
            var around = charsAround(cm, ranges[i].head);
            if (!around || pairs.indexOf(around) % 2 != 0) return CodeMirror.Pass;
          }
          for (var i = ranges.length - 1; i >= 0; i--) {
            var cur = ranges[i].head;
            cm.replaceRange("", Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1));
          }
        }
      };
      var closingBrackets = "";
      for (var i = 0; i < pairs.length; i += 2) (function(left, right) {
        closingBrackets += right;
        map["'" + left + "'"] = function(cm) {
          if (cm.getOption("disableInput")) return CodeMirror.Pass;
          var ranges = cm.listSelections(), type, next;
          for (var i = 0; i < ranges.length; i++) {
            var range = ranges[i], cur = range.head, curType;
            var next = cm.getRange(cur, Pos(cur.line, cur.ch + 1));
            if (!range.empty()) {
              curType = "surround";
            } else if (left == right && next == right) {
              if (cm.getRange(cur, Pos(cur.line, cur.ch + 3)) == left + left + left)
                curType = "skipThree";
              else
                curType = "skip";
            } else if (left == right && cur.ch > 1 && triples.indexOf(left) >= 0 &&
                       cm.getRange(Pos(cur.line, cur.ch - 2), cur) == left + left &&
                       (cur.ch <= 2 || cm.getRange(Pos(cur.line, cur.ch - 3), Pos(cur.line, cur.ch - 2)) != left)) {
              curType = "addFour";
            } else if (left == '"' || left == "'") {
              if (!CodeMirror.isWordChar(next) && enteringString(cm, cur, left)) curType = "both";
              else return CodeMirror.Pass;
            } else if (cm.getLine(cur.line).length == cur.ch || closingBrackets.indexOf(next) >= 0 || SPACE_CHAR_REGEX.test(next)) {
              curType = "both";
            } else {
              return CodeMirror.Pass;
            }
            if (!type) type = curType;
            else if (type != curType) return CodeMirror.Pass;
          }
  
          cm.operation(function() {
            if (type == "skip") {
              cm.execCommand("goCharRight");
            } else if (type == "skipThree") {
              for (var i = 0; i < 3; i++)
                cm.execCommand("goCharRight");
            } else if (type == "surround") {
              var sels = cm.getSelections();
              for (var i = 0; i < sels.length; i++)
                sels[i] = left + sels[i] + right;
              cm.replaceSelections(sels, "around");
            } else if (type == "both") {
              cm.replaceSelection(left + right, null);
              cm.execCommand("goCharLeft");
            } else if (type == "addFour") {
              cm.replaceSelection(left + left + left + left, "before");
              cm.execCommand("goCharRight");
            }
          });
        };
        if (left != right) map["'" + right + "'"] = function(cm) {
          var ranges = cm.listSelections();
          for (var i = 0; i < ranges.length; i++) {
            var range = ranges[i];
            if (!range.empty() ||
                cm.getRange(range.head, Pos(range.head.line, range.head.ch + 1)) != right)
              return CodeMirror.Pass;
          }
          cm.execCommand("goCharRight");
        };
      })(pairs.charAt(i), pairs.charAt(i + 1));
      return map;
    }
  
    function buildExplodeHandler(pairs) {
      return function(cm) {
        if (cm.getOption("disableInput")) return CodeMirror.Pass;
        var ranges = cm.listSelections();
        for (var i = 0; i < ranges.length; i++) {
          if (!ranges[i].empty()) return CodeMirror.Pass;
          var around = charsAround(cm, ranges[i].head);
          if (!around || pairs.indexOf(around) % 2 != 0) return CodeMirror.Pass;
        }
        cm.operation(function() {
          cm.replaceSelection("\n\n", null);
          cm.execCommand("goCharLeft");
          ranges = cm.listSelections();
          for (var i = 0; i < ranges.length; i++) {
            var line = ranges[i].head.line;
            cm.indentLine(line, null, true);
            cm.indentLine(line + 1, null, true);
          }
        });
      };
    }
  });
  
  