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[TS] Use TextEncoder and TextDecoder (#7400)

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* [TS] Use TextEncoder

TextEncoder is well supported these days, see https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder#browser_compatibility.

* Reuse instance

* Also use TextDecoder

* Forgot to add text_decoder_ member

Co-authored-by: Derek Bailey <derekbailey@google.com>
This commit is contained in:
Björn Harrtell
2022-08-07 00:00:30 +02:00
committed by GitHub
parent 30d76198c7
commit 950444a343
2 changed files with 11 additions and 90 deletions
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36
ts/builder.ts
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@@ -24,6 +24,7 @@ export class Builder {
private force_defaults = false;
private string_maps: Map<string | Uint8Array, number> | null = null;
private text_encoder = new TextEncoder();
/**
* Create a FlatBufferBuilder.
@@ -531,40 +532,7 @@ export class Builder {
if (s instanceof Uint8Array) {
utf8 = s;
} else {
utf8 = [];
let i = 0;
while (i < s.length) {
let codePoint;
// Decode UTF-16
const a = s.charCodeAt(i++);
if (a < 0xD800 || a >= 0xDC00) {
codePoint = a;
} else {
const b = s.charCodeAt(i++);
codePoint = (a << 10) + b + (0x10000 - (0xD800 << 10) - 0xDC00);
}
// Encode UTF-8
if (codePoint < 0x80) {
utf8.push(codePoint);
} else {
if (codePoint < 0x800) {
utf8.push(((codePoint >> 6) & 0x1F) | 0xC0);
} else {
if (codePoint < 0x10000) {
utf8.push(((codePoint >> 12) & 0x0F) | 0xE0);
} else {
utf8.push(
((codePoint >> 18) & 0x07) | 0xF0,
((codePoint >> 12) & 0x3F) | 0x80);
}
utf8.push(((codePoint >> 6) & 0x3F) | 0x80);
}
utf8.push((codePoint & 0x3F) | 0x80);
}
}
utf8 = this.text_encoder.encode(s);
}
this.addInt8(0);