import OutputStream from './output-stream';
export function* stringDecoder(view, start) {
let length = 0;
let index = 0;
let shift = 0;
let addr = start;
while (true) {
const byte = view.getUint8(addr, true);
length |= (byte & 0x7f) << shift;
addr += 1;
if ((byte & 0x80) === 0) {
break;
}
shift += 7;
}
let result = 0;
while (index < length) {
result = 0;
shift = 0;
while (true) {
const byte = view.getUint8(addr, true);
result |= (byte & 0x7f) << shift;
addr += 1;
if ((byte & 0x80) === 0) {
break;
}
shift += 7;
}
index += 1;
yield result;
}
}
export function stringEncoder(value) {
const resultStream = new OutputStream();
const characterStream = new OutputStream();
characterStream.push('varuint32', value.length, value);
let i = 0;
for (i = 0; i < value.length; i++) {
characterStream.push('varuint32', value.codePointAt(i), value[i]);
}
resultStream.write(characterStream);
return resultStream;
}
export const getText = memory => ptr => {
let text = '';
const decoder = stringDecoder(new DataView(memory.buffer), ptr);
let iterator = decoder.next();
while (!iterator.done) {
text += String.fromCodePoint(iterator.value);
iterator = decoder.next();
}
return text;
};
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