Rewriting Project

1 files changed, 47 insertions, 0 deletions

diff --git a/node_modules/utf8-byte-length/browser.js b/node_modules/utf8-byte-length/browser.js
new file mode 100644
index 0000000..a093731
--- /dev/null
+++ b/node_modules/utf8-byte-length/browser.js
@@ -0,0 +1,47 @@
+'use strict';
+
+function isHighSurrogate(codePoint) {
+  return codePoint >= 0xd800 && codePoint <= 0xdbff;
+}
+
+function isLowSurrogate(codePoint) {
+  return codePoint >= 0xdc00 && codePoint <= 0xdfff;
+}
+
+// Truncate string by size in bytes
+module.exports = function getByteLength(string) {
+  if (typeof string !== "string") {
+    throw new Error("Input must be string");
+  }
+
+  var charLength = string.length;
+  var byteLength = 0;
+  var codePoint = null;
+  var prevCodePoint = null;
+  for (var i = 0; i < charLength; i++) {
+    codePoint = string.charCodeAt(i);
+    // handle 4-byte non-BMP chars
+    // low surrogate
+    if (isLowSurrogate(codePoint)) {
+      // when parsing previous hi-surrogate, 3 is added to byteLength
+      if (prevCodePoint != null && isHighSurrogate(prevCodePoint)) {
+        byteLength += 1;
+      }
+      else {
+        byteLength += 3;
+      }
+    }
+    else if (codePoint <= 0x7f ) {
+      byteLength += 1;
+    }
+    else if (codePoint >= 0x80 && codePoint <= 0x7ff) {
+      byteLength += 2;
+    }
+    else if (codePoint >= 0x800 && codePoint <= 0xffff) {
+      byteLength += 3;
+    }
+    prevCodePoint = codePoint;
+  }
+
+  return byteLength;
+};