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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"), require("../fold/xml-fold"));
   7    else if (typeof define == "function" && define.amd) // AMD
   8      define(["../../lib/codemirror", "../fold/xml-fold"], mod);
   9    else // Plain browser env
  10      mod(CodeMirror);
  11  })(function(CodeMirror) {
  12    "use strict";
  13  
  14    CodeMirror.defineOption("matchTags", false, function(cm, val, old) {
  15      if (old && old != CodeMirror.Init) {
  16        cm.off("cursorActivity", doMatchTags);
  17        cm.off("viewportChange", maybeUpdateMatch);
  18        clear(cm);
  19      }
  20      if (val) {
  21        cm.state.matchBothTags = typeof val == "object" && val.bothTags;
  22        cm.on("cursorActivity", doMatchTags);
  23        cm.on("viewportChange", maybeUpdateMatch);
  24        doMatchTags(cm);
  25      }
  26    });
  27  
  28    function clear(cm) {
  29      if (cm.state.tagHit) cm.state.tagHit.clear();
  30      if (cm.state.tagOther) cm.state.tagOther.clear();
  31      cm.state.tagHit = cm.state.tagOther = null;
  32    }
  33  
  34    function doMatchTags(cm) {
  35      cm.state.failedTagMatch = false;
  36      cm.operation(function() {
  37        clear(cm);
  38        if (cm.somethingSelected()) return;
  39        var cur = cm.getCursor(), range = cm.getViewport();
  40        range.from = Math.min(range.from, cur.line); range.to = Math.max(cur.line + 1, range.to);
  41        var match = CodeMirror.findMatchingTag(cm, cur, range);
  42        if (!match) return;
  43        if (cm.state.matchBothTags) {
  44          var hit = match.at == "open" ? match.open : match.close;
  45          if (hit) cm.state.tagHit = cm.markText(hit.from, hit.to, {className: "CodeMirror-matchingtag"});
  46        }
  47        var other = match.at == "close" ? match.open : match.close;
  48        if (other)
  49          cm.state.tagOther = cm.markText(other.from, other.to, {className: "CodeMirror-matchingtag"});
  50        else
  51          cm.state.failedTagMatch = true;
  52      });
  53    }
  54  
  55    function maybeUpdateMatch(cm) {
  56      if (cm.state.failedTagMatch) doMatchTags(cm);
  57    }
  58  
  59    CodeMirror.commands.toMatchingTag = function(cm) {
  60      var found = CodeMirror.findMatchingTag(cm, cm.getCursor());
  61      if (found) {
  62        var other = found.at == "close" ? found.open : found.close;
  63        if (other) cm.extendSelection(other.to, other.from);
  64      }
  65    };
  66  });