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) {
    "use strict";
  
    var Pos = CodeMirror.Pos;
    function cmp(a, b) { return a.line - b.line || a.ch - b.ch; }
  
    var nameStartChar = "A-Z_a-z\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02FF\\u0370-\\u037D\\u037F-\\u1FFF\\u200C-\\u200D\\u2070-\\u218F\\u2C00-\\u2FEF\\u3001-\\uD7FF\\uF900-\\uFDCF\\uFDF0-\\uFFFD";
    var nameChar = nameStartChar + "\-\:\.0-9\\u00B7\\u0300-\\u036F\\u203F-\\u2040";
    var xmlTagStart = new RegExp("<(/?)([" + nameStartChar + "][" + nameChar + "]*)", "g");
  
    function Iter(cm, line, ch, range) {
      this.line = line; this.ch = ch;
      this.cm = cm; this.text = cm.getLine(line);
      this.min = range ? Math.max(range.from, cm.firstLine()) : cm.firstLine();
      this.max = range ? Math.min(range.to - 1, cm.lastLine()) : cm.lastLine();
    }
  
    function tagAt(iter, ch) {
      var type = iter.cm.getTokenTypeAt(Pos(iter.line, ch));
      return type && /\btag\b/.test(type);
    }
  
    function nextLine(iter) {
      if (iter.line >= iter.max) return;
      iter.ch = 0;
      iter.text = iter.cm.getLine(++iter.line);
      return true;
    }
    function prevLine(iter) {
      if (iter.line <= iter.min) return;
      iter.text = iter.cm.getLine(--iter.line);
      iter.ch = iter.text.length;
      return true;
    }
  
    function toTagEnd(iter) {
      for (;;) {
        var gt = iter.text.indexOf(">", iter.ch);
        if (gt == -1) { if (nextLine(iter)) continue; else return; }
        if (!tagAt(iter, gt + 1)) { iter.ch = gt + 1; continue; }
        var lastSlash = iter.text.lastIndexOf("/", gt);
        var selfClose = lastSlash > -1 && !/\S/.test(iter.text.slice(lastSlash + 1, gt));
        iter.ch = gt + 1;
        return selfClose ? "selfClose" : "regular";
      }
    }
    function toTagStart(iter) {
      for (;;) {
        var lt = iter.ch ? iter.text.lastIndexOf("<", iter.ch - 1) : -1;
        if (lt == -1) { if (prevLine(iter)) continue; else return; }
        if (!tagAt(iter, lt + 1)) { iter.ch = lt; continue; }
        xmlTagStart.lastIndex = lt;
        iter.ch = lt;
        var match = xmlTagStart.exec(iter.text);
        if (match && match.index == lt) return match;
      }
    }
  
    function toNextTag(iter) {
      for (;;) {
        xmlTagStart.lastIndex = iter.ch;
        var found = xmlTagStart.exec(iter.text);
        if (!found) { if (nextLine(iter)) continue; else return; }
        if (!tagAt(iter, found.index + 1)) { iter.ch = found.index + 1; continue; }
        iter.ch = found.index + found[0].length;
        return found;
      }
    }
    function toPrevTag(iter) {
      for (;;) {
        var gt = iter.ch ? iter.text.lastIndexOf(">", iter.ch - 1) : -1;
        if (gt == -1) { if (prevLine(iter)) continue; else return; }
        if (!tagAt(iter, gt + 1)) { iter.ch = gt; continue; }
        var lastSlash = iter.text.lastIndexOf("/", gt);
        var selfClose = lastSlash > -1 && !/\S/.test(iter.text.slice(lastSlash + 1, gt));
        iter.ch = gt + 1;
        return selfClose ? "selfClose" : "regular";
      }
    }
  
    function findMatchingClose(iter, tag) {
      var stack = [];
      for (;;) {
        var next = toNextTag(iter), end, startLine = iter.line, startCh = iter.ch - (next ? next[0].length : 0);
        if (!next || !(end = toTagEnd(iter))) return;
        if (end == "selfClose") continue;
        if (next[1]) { // closing tag
          for (var i = stack.length - 1; i >= 0; --i) if (stack[i] == next[2]) {
            stack.length = i;
            break;
          }
          if (i < 0 && (!tag || tag == next[2])) return {
            tag: next[2],
            from: Pos(startLine, startCh),
            to: Pos(iter.line, iter.ch)
          };
        } else { // opening tag
          stack.push(next[2]);
        }
      }
    }
    function findMatchingOpen(iter, tag) {
      var stack = [];
      for (;;) {
        var prev = toPrevTag(iter);
        if (!prev) return;
        if (prev == "selfClose") { toTagStart(iter); continue; }
        var endLine = iter.line, endCh = iter.ch;
        var start = toTagStart(iter);
        if (!start) return;
        if (start[1]) { // closing tag
          stack.push(start[2]);
        } else { // opening tag
          for (var i = stack.length - 1; i >= 0; --i) if (stack[i] == start[2]) {
            stack.length = i;
            break;
          }
          if (i < 0 && (!tag || tag == start[2])) return {
            tag: start[2],
            from: Pos(iter.line, iter.ch),
            to: Pos(endLine, endCh)
          };
        }
      }
    }
  
    CodeMirror.registerHelper("fold", "xml", function(cm, start) {
      var iter = new Iter(cm, start.line, 0);
      for (;;) {
        var openTag = toNextTag(iter), end;
        if (!openTag || iter.line != start.line || !(end = toTagEnd(iter))) return;
        if (!openTag[1] && end != "selfClose") {
          var startPos = Pos(iter.line, iter.ch);
          var endPos = findMatchingClose(iter, openTag[2]);
          return endPos && {from: startPos, to: endPos.from};
        }
      }
    });
    CodeMirror.findMatchingTag = function(cm, pos, range) {
      var iter = new Iter(cm, pos.line, pos.ch, range);
      if (iter.text.indexOf(">") == -1 && iter.text.indexOf("<") == -1) return;
      var end = toTagEnd(iter), to = end && Pos(iter.line, iter.ch);
      var start = end && toTagStart(iter);
      if (!end || !start || cmp(iter, pos) > 0) return;
      var here = {from: Pos(iter.line, iter.ch), to: to, tag: start[2]};
      if (end == "selfClose") return {open: here, close: null, at: "open"};
  
      if (start[1]) { // closing tag
        return {open: findMatchingOpen(iter, start[2]), close: here, at: "close"};
      } else { // opening tag
        iter = new Iter(cm, to.line, to.ch, range);
        return {open: here, close: findMatchingClose(iter, start[2]), at: "open"};
      }
    };
  
    CodeMirror.findEnclosingTag = function(cm, pos, range) {
      var iter = new Iter(cm, pos.line, pos.ch, range);
      for (;;) {
        var open = findMatchingOpen(iter);
        if (!open) break;
        var forward = new Iter(cm, pos.line, pos.ch, range);
        var close = findMatchingClose(forward, open.tag);
        if (close) return {open: open, close: close};
      }
    };
  
    // Used by addon/edit/closetag.js
    CodeMirror.scanForClosingTag = function(cm, pos, name, end) {
      var iter = new Iter(cm, pos.line, pos.ch, end ? {from: 0, to: end} : null);
      return findMatchingClose(iter, name);
    };
  });