jmuehlner commented on code in PR #853:
URL: https://github.com/apache/guacamole-client/pull/853#discussion_r1186353027
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guacamole-common-js/src/main/webapp/modules/Parser.js:
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@@ -157,3 +241,74 @@ Guacamole.Parser = function() {
this.oninstruction = null;
};
+
+/**
+ * Returns the number of Unicode codepoints (not code units) within the given
+ * string. If character offsets are provided, only codepoints between those
+ * offsets are counted. Unlike the length property of a string, this function
+ * counts proper surrogate pairs as a single codepoint. High and low surrogate
+ * characters that are not part of a proper surrogate pair are counted
+ * separately as individual codepoints.
+ *
+ * @param {!string} str
+ * The string whose contents should be inspected.
+ *
+ * @param {number} [start=0]
+ * The index of the location in the given string where codepoint counting
+ * should start. If omitted, counting will begin at the start of the
+ * string.
+ *
+ * @param {number} [end]
+ * The index of the first location in the given string after where counting
+ * should stop (the character after the last character being counted). If
+ * omitted, all characters after the start location will be counted.
+ *
+ * @returns {!number}
+ * The number of Unicode codepoints within the requested portion of the
+ * given string.
+ */
+Guacamole.Parser.codePointCount = function codePointCount(str, start, end) {
+ str = str.substring(start || 0, end);
+ var surrogatePairs = str.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g);
Review Comment:
A quick comment (or commented constant) on what this regex is doing would be
cool.
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