performance #1956 added highlightSizeThreshold option disable highlight when length more than highlightSizeThreshold

lib/highlight.9.1.0.pack_extended.js

@@ -0,0 +1,34 @@
+'use strict';
+
+(function () {
+    var configure, highlightBlock;
+
+    configure = hljs.configure;
+    // "extending" hljs.configure method
+    hljs.configure = function _configure (options) {
+        var size = options.highlightSizeThreshold;
+
+        // added highlightSizeThreshold option to set maximum size
+        // of processed string. Set to null if not a number
+        hljs.highlightSizeThreshold = size === +size ? size : null;
+
+        configure.call(this, options);
+    };
+
+    highlightBlock = hljs.highlightBlock;
+
+    // "extending" hljs.highlightBlock method
+    hljs.highlightBlock = function _highlightBlock (el) {
+        var innerHTML = el.innerHTML;
+        var size = hljs.highlightSizeThreshold;
+
+        // check if highlightSizeThreshold is not set or element innerHTML
+        // is less than set option highlightSizeThreshold
+        if (size == null || size > innerHTML.length) {
+            // proceed with hljs.highlightBlock
+            highlightBlock.call(hljs, el);
+        }
+    };
+
+})();
+