sheetjs/modules/src/util.ts
2022-01-31 06:41:23 -05:00

48 lines
1.7 KiB
TypeScript

/*! sheetjs (C) 2013-present SheetJS -- http://sheetjs.com */
var u8_to_dataview = (array: Uint8Array): DataView => new DataView(array.buffer, array.byteOffset, array.byteLength);
export { u8_to_dataview };
var u8str = (u8: Uint8Array): string => /* Buffer.isBuffer(u8) ? u8.toString() :*/ new TextDecoder().decode(u8);
export { u8str };
var u8concat = (u8a: Uint8Array[]): Uint8Array => {
var len = u8a.reduce((acc: number, x: Uint8Array) => acc + x.length, 0);
var out = new Uint8Array(len);
var off = 0;
u8a.forEach(u8 => { out.set(u8, off); off += u8.length; });
return out;
};
export { u8concat };
var indent = (str: string, depth: number /* = 1 */): string => str.split(/\n/g).map(x => x && " ".repeat(depth) + x).join("\n");
export { indent };
function u8indexOf(u8: Uint8Array, data: string | number | Uint8Array, byteOffset?: number): number {
//if(Buffer.isBuffer(u8)) return u8.indexOf(data, byteOffset);
if(typeof data == "number") return u8.indexOf(data, byteOffset);
var l = byteOffset;
if(typeof data == "string") {
outs: while((l = u8.indexOf(data.charCodeAt(0), l)) > -1) {
++l;
for(var j = 1; j < data.length; ++j) if(u8[l+j-1] != data.charCodeAt(j)) continue outs;
return l - 1;
}
} else {
outb: while((l = u8.indexOf(data[0], l)) > -1) {
++l;
for(var j = 1; j < data.length; ++j) if(u8[l+j-1] != data[j]) continue outb;
return l - 1;
}
}
return -1;
}
export { u8indexOf };
/* Hopefully one day this will be added to the language */
var popcnt = (x: number): number => {
x -= ((x >> 1) & 0x55555555);
x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
return (((x + (x >> 4)) & 0x0F0F0F0F) * 0x01010101) >>> 24;
};
export { popcnt };