@effect-ts/system
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Effect-TS is a zero dependency set of libraries to write highly productive, purely functional TypeScript at scale.
68 lines (63 loc) • 2.76 kB
JavaScript
// ets_tracing: off
import * as CK from "../../../../Collections/Immutable/Chunk/index.mjs";
import * as Tp from "../../../../Collections/Immutable/Tuple/index.mjs";
import { pipe } from "../../../../Function/index.mjs";
import * as O from "../../../../Option/index.mjs";
import * as CH from "../../Channel/index.mjs";
import * as C from "../core.mjs";
/**
* Splits strings on newlines. Handles both Windows newlines (`\r\n`) and UNIX newlines (`\n`).
*/
export function splitLines(self) {
const next = (leftover, wasSplitCRLF) => CH.readWithCause(incomingChunk => {
const buffer = CK.builder();
let inCRLF = wasSplitCRLF;
let carry = O.getOrElse_(leftover, () => "");
CK.forEach_(incomingChunk, string => {
const concatenated = carry + string;
if (string.length > 0) {
const continueFrom = inCRLF && carry.length > 0 ? carry.length - 1 : carry.length;
return (({
tuple: [sliceStart, _, midCRLF]
}) => {
carry = concatenated.slice(sliceStart);
inCRLF = midCRLF;
})(CK.reduce_(CK.drop_(CK.zipWithIndex(CK.from(concatenated)), continueFrom), Tp.tuple(0, false, inCRLF), ({
tuple: [sliceStart, skipNext, midCRLF]
}, {
tuple: [char, index]
}) => {
if (skipNext) {
return Tp.tuple(sliceStart, false, false);
} else {
switch (char) {
case "\n":
{
buffer.append(concatenated.slice(sliceStart, index));
return Tp.tuple(index + 1, false, midCRLF);
}
case "\r":
{
if (index + 1 < concatenated.length && concatenated[index + 1] === "\n") {
buffer.append(concatenated.slice(sliceStart, index));
return Tp.tuple(index + 2, true, false);
} else if (index === concatenated.length - 1) {
return Tp.tuple(sliceStart, false, true);
} else {
return Tp.tuple(index, false, false);
}
}
default:
{
return Tp.tuple(sliceStart, false, midCRLF);
}
}
}
}));
}
});
return CH.zipRight_(CH.write(buffer.build()), next(carry.length > 0 ? O.some(carry) : O.none, inCRLF));
}, halt => O.fold_(leftover, () => CH.failCause(halt), value => CH.zipRight_(CH.write(CK.single(value)), CH.failCause(halt))), done => O.fold_(leftover, () => CH.end(done), value => CH.zipRight_(CH.write(CK.single(value)), CH.end(done))));
return new C.Stream(self.channel[">>>"](next(O.none, false)));
}
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