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GUACAMOLE-615: Clarify/document internals of JS implementation of codePointCount().

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Mike Jumper
2023-05-05 11:12:37 -07:00
parent 38f7b09efb
commit 5374163c95
1 changed files with 11 additions and 0 deletions
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11
guacamole-common-js/src/main/webapp/modules/Parser.js
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@@ -268,9 +268,20 @@ Guacamole.Parser = function Parser() {
* given string. * given string.
*/ */
Guacamole.Parser.codePointCount = function codePointCount(str, start, end) { Guacamole.Parser.codePointCount = function codePointCount(str, start, end) {
// Count only characters within the specified region
str = str.substring(start || 0, end); str = str.substring(start || 0, end);
// Locate each proper Unicode surrogate pair (one high surrogate followed
// by one low surrogate)
var surrogatePairs = str.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g); var surrogatePairs = str.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g);
// Each surrogate pair represents a single codepoint but is represented by
// two characters in a JavaScript string, and thus is counted twice toward
// string length. Subtracting the number of surrogate pairs adjusts that
// length value such that it gives us the number of codepoints.
return str.length - (surrogatePairs ? surrogatePairs.length : 0); return str.length - (surrogatePairs ? surrogatePairs.length : 0);
}; };
/** /**