1 files changed, 65 insertions, 0 deletions
diff --git a/js/lib/from-code-point.js b/js/lib/from-code-point.js
new file mode 100644
index 0000000..bf1dd99
--- /dev/null
+++ b/js/lib/from-code-point.js
@@ -0,0 +1,65 @@
+// polyfill for fromCodePoint:
+// https://github.com/mathiasbynens/String.fromCodePoint
+/*! http://mths.be/fromcodepoint v0.2.1 by @mathias */
+if (!String.fromCodePoint) {
+    (function() {
+        var defineProperty = (function() {
+            // IE 8 only supports `Object.defineProperty` on DOM elements
+            try {
+                var object = {};
+                var $defineProperty = Object.defineProperty;
+                var result = $defineProperty(object, object, object) && $defineProperty;
+            } catch(error) {}
+            return result;
+        }());
+        var stringFromCharCode = String.fromCharCode;
+        var floor = Math.floor;
+        var fromCodePoint = function(_) {
+            var MAX_SIZE = 0x4000;
+            var codeUnits = [];
+            var highSurrogate;
+            var lowSurrogate;
+            var index = -1;
+            var length = arguments.length;
+            if (!length) {
+                return '';
+            }
+            var result = '';
+            while (++index < length) {
+                var codePoint = Number(arguments[index]);
+                if (
+                    !isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
+                        codePoint < 0 || // not a valid Unicode code point
+                        codePoint > 0x10FFFF || // not a valid Unicode code point
+                        floor(codePoint) != codePoint // not an integer
+                ) {
+                    return String.fromCharCode(0xFFFD);
+                }
+                if (codePoint <= 0xFFFF) { // BMP code point
+                    codeUnits.push(codePoint);
+                } else { // Astral code point; split in surrogate halves
+                    // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
+                    codePoint -= 0x10000;
+                    highSurrogate = (codePoint >> 10) + 0xD800;
+                    lowSurrogate = (codePoint % 0x400) + 0xDC00;
+                    codeUnits.push(highSurrogate, lowSurrogate);
+                }
+                if (index + 1 == length || codeUnits.length > MAX_SIZE) {
+                    result += stringFromCharCode.apply(null, codeUnits);
+                    codeUnits.length = 0;
+                }
+            }
+            return result;
+        };
+        if (defineProperty) {
+            defineProperty(String, 'fromCodePoint', {
+                'value': fromCodePoint,
+                'configurable': true,
+                'writable': true
+            });
+        } else {
+            String.fromCodePoint = fromCodePoint;
+        }
+    }());
+}
+