japanese-string-utils
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The utils convert Japanese strings to other forms, such as Hiragana, Katakana, Full-width, Half-width, numeric and others.
30 lines (20 loc) • 551 B
text/typescript
// Ａ -> A
// １ -> 1
export function toAscii( value: string ): string {
const charArray: number[] = [];
for ( let i = value.length - 1; 0 <= i; i -- ) {
const charCode = charArray[ i ] = value.charCodeAt( i );
switch ( true ) {
case ( charCode <= 0xff5e && 0xff01 <= charCode ) :
charArray[ i ] -= 0xfee0;
break;
case ( charCode === 0x3000 ):
charArray[ i ] = 0x0020;
break;
case ( charCode === 0x30FC ):
charArray[ i ] = 0x002D;
break;
}
}
return String.fromCharCode.apply( null, charArray );
}