eastasianwidth - npm Package Compare versions

Comparing version 0.1.1 to 0.2.0

eastasianwidth.js

@@ -271,6 +271,12 @@ var eaw = {};
 
+// Split a string considering surrogate-pairs.
+function stringToArray(string) {
+  return string.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]|[^\uD800-\uDFFF]/g) || [];
+}
+
 eaw.length = function(string) {
+  var characters = stringToArray(string);
   var len = 0;
-  for (var i = 0; i < string.length; i++) {
-    len = len + this.characterLength(string.charAt(i));
+  for (var i = 0; i < characters.length; i++) {
+    len = len + this.characterLength(characters[i]);
   }
@@ -281,13 +287,27 @@ return len;
 eaw.slice = function(text, start, end) {
+  textLen = eaw.length(text)
   start = start ? start : 0;
   end = end ? end : 1;
+  if (start < 0) {
+      start = textLen + start;
+  }
+  if (end < 0) {
+      end = textLen + end;
+  }
   var result = '';
-  for (var i = 0; i < text.length; i++) {
-    var char = text.charAt(i);
-    var eawLen = eaw.length(result + char);
-    if (eawLen >= 1 + start && eawLen < 1 + end) {
-      result += char
+  var eawLen = 0;
+  var chars = stringToArray(text);
+  for (var i = 0; i < chars.length; i++) {
+    var char = chars[i];
+    var charLen = eaw.length(char);
+    if (eawLen >= start - (charLen == 2 ? 1 : 0)) {
+        if (eawLen + charLen <= end) {
+            result += char;
+        } else {
+            break;
+        }
     }
+    eawLen += charLen;
   }
   return result;
 };

package.json

 {
   "name": "eastasianwidth",
-  "version": "0.1.1",
+  "version": "0.2.0",
   "description": "Get East Asian Width from a character.",
   "main": "eastasianwidth.js",
+  "files": [
+    "eastasianwidth.js"
+  ],
   "scripts": {
@@ -7,0 +10,0 @@ "test": "mocha"

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Worsened metrics

Total package byte prevSize

13640

decreased by-10.83%

Number of package files

3

decreased by-25%

Lines of code

303

decreased by-13.68%

No dependency changes