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server/util/mb_strwidth.ts

@@ -0,0 +1,24 @@
+//https://gist.github.com/demouth/3217440
+/**
+ * mb_strwidth
+ * @see http://php.net/manual/function.mb-strwidth.php
+ */
+export function mb_strwidth(str: string): number {
+    const l = str.length;
+    let length = 0;
+    for (let i = 0; i < l; i++) {
+        const c = str.charCodeAt(i);
+        if (0x0000 <= c && c <= 0x0019) {
+            length += 0;
+        } else if (0x0020 <= c && c <= 0x1FFF) {
+            length += 1;
+        } else if (0x2000 <= c && c <= 0xFF60) {
+            length += 2;
+        } else if (0xFF61 <= c && c <= 0xFF9F) {
+            length += 1;
+        } else if (0xFFA0 <= c) {
+            length += 2;
+        }
+    }
+    return length;
+}