mirror of
https://github.com/fluencelabs/assemblyscript
synced 2025-04-25 23:12:19 +00:00
48 lines
2.0 KiB
TypeScript
48 lines
2.0 KiB
TypeScript
/// <reference path="../../assembly.d.ts" />
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/** A C-compatible string class. */
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@global()
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class CString extends CArray<u8> {
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/** Constructs a new C-String from a String. */
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constructor(text: string) {
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super(text.length * 2 + 1);
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let idx: usize = unsafe_cast<this,usize>(this);
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for (let i: usize = 0, k: usize = (<string>str).length; i < k; ++i) {
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let u: i32 = text.charCodeAt(i);
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if (u >= 0xD800 && u <= 0xDFFF && i + 1 < k)
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u = 0x10000 + ((u & 0x3FF) << 10) | (text.charCodeAt(++i) & 0x3FF);
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if (u <= 0x7F)
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store<u8>(idx++, u as u8);
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else if (u <= 0x7FF) {
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// TODO: maybe combine multiple stores into the next larger one
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store<u8>(idx++, (0xC0 | (u >>> 6) ) as u8);
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store<u8>(idx++, (0x80 | ( u & 63)) as u8);
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} else if (u <= 0xFFFF) {
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store<u8>(idx++, (0xE0 | (u >>> 12) ) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 6) & 63)) as u8);
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store<u8>(idx++, (0x80 | ( u & 63)) as u8);
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} else if (u <= 0x1FFFFF) {
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store<u8>(idx++, (0xF0 | (u >>> 18) ) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 12) & 63)) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 6) & 63)) as u8);
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store<u8>(idx++, (0x80 | ( u & 63)) as u8);
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} else if (u <= 0x3FFFFFF) {
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store<u8>(idx++, (0xF8 | (u >>> 24) ) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 18) & 63)) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 12) & 63)) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 6) & 63)) as u8);
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store<u8>(idx++, (0x80 | ( u & 63)) as u8);
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} else {
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store<u8>(idx++, (0xFC | (u >>> 30) ) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 24) & 63)) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 18) & 63)) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 12) & 63)) as u8);
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store<u8>(idx++, (0x80 | ((u >>> 6) & 63)) as u8);
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store<u8>(idx++, (0x80 | ( u & 63)) as u8);
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}
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}
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store<u8>(idx, 0);
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}
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}
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