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codemirror/lib/util/match-highlighter.js

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+// Define match-highlighter commands. Depends on searchcursor.js
+// Use by attaching the following function call to the cursorActivity event:
+	//myCodeMirror.matchHighlight(minChars);
+// And including a special span.CodeMirror-matchhighlight css class (also optionally a separate one for .CodeMirror-focused -- see demo matchhighlighter.html)
+
+(function() {
+  var DEFAULT_MIN_CHARS = 2;
+  
+  function MatchHighlightState() {
+	this.marked = [];
+  }
+  function getMatchHighlightState(cm) {
+	return cm._matchHighlightState || (cm._matchHighlightState = new MatchHighlightState());
+  }
+  
+  function clearMarks(cm) {
+	var state = getMatchHighlightState(cm);
+	for (var i = 0; i < state.marked.length; ++i)
+		state.marked[i].clear();
+	state.marked = [];
+  }
+  
+  function markDocument(cm, className, minChars) {
+    clearMarks(cm);
+	minChars = (typeof minChars !== 'undefined' ? minChars : DEFAULT_MIN_CHARS);
+	if (cm.somethingSelected() && cm.getSelection().replace(/^\s+|\s+$/g, "").length >= minChars) {
+		var state = getMatchHighlightState(cm);
+		var query = cm.getSelection();
+		cm.operation(function() {
+			if (cm.lineCount() < 2000) { // This is too expensive on big documents.
+			  for (var cursor = cm.getSearchCursor(query); cursor.findNext();) {
+				//Only apply matchhighlight to the matches other than the one actually selected
+				if (cursor.from().line !== cm.getCursor(true).line ||
+                                    cursor.from().ch !== cm.getCursor(true).ch)
+					state.marked.push(cm.markText(cursor.from(), cursor.to(),
+                                                                      {className: className}));
+			  }
+			}
+		  });
+	}
+  }
+
+  CodeMirror.defineExtension("matchHighlight", function(className, minChars) {
+    markDocument(this, className, minChars);
+  });
+})();