MORE CODE REVIEW

src/reader.ts

@@ -388,91 +388,3 @@ export const readAllLines = (slice: FileSlice, length: number, options?: {
 
 	return lines;
 };
-
-export class LineReader {
-	getReader: () => MaybePromise<Reader>;
-	ignore?: (line: string) => boolean;
-	reader: Reader | null = null;
-	textDecoder = new TextDecoder();
-	currentLineNumber = 0; // 1-based
-	readPos = 0;
-	reachedEnd = false;
-	lineBuffer = '';
-
-	constructor(getReader: () => MaybePromise<Reader>, ignore?: (line: string) => boolean) {
-		this.getReader = getReader;
-		this.ignore = ignore;
-	}
-
-	readNextLine(): MaybePromise<string | null> {
-		if (this.reachedEnd) {
-			return null;
-		}
-
-		const line = this.extractLineFromBuffer();
-		if (line !== null) {
-			return line;
-		}
-
-		return (async () => {
-			if (!this.reader) {
-				let reader = this.getReader();
-				if (reader instanceof Promise) reader = await reader;
-
-				this.reader = reader;
-			}
-
-			while (true) {
-				let slice = this.reader.requestSliceRange(this.readPos, 0, 1024);
-				if (slice instanceof Promise) slice = await slice;
-
-				if (!slice || slice.length === 0) {
-					this.reachedEnd = true;
-					const line = this.lineBuffer.trim();
-					this.lineBuffer = '';
-
-					if (line) {
-						this.currentLineNumber++;
-					}
-
-					if (!line || this.ignore?.(line)) {
-						return null;
-					}
-
-					return line;
-				}
-
-				const bytes = readBytes(slice, slice.length);
-				this.readPos += bytes.length;
-
-				this.lineBuffer += this.textDecoder.decode(bytes, { stream: true });
-
-				const line = this.extractLineFromBuffer();
-				if (line !== null) {
-					return line;
-				}
-			}
-		})();
-	}
-
-	extractLineFromBuffer() {
-		assert(!this.reachedEnd);
-
-		while (true) {
-			const newlineIndex = this.lineBuffer.indexOf('\n');
-			if (newlineIndex === -1) {
-				return null;
-			}
-
-			const line = this.lineBuffer.slice(0, newlineIndex).trim();
-			this.lineBuffer = this.lineBuffer.slice(newlineIndex + 1);
-			this.currentLineNumber++;
-
-			if (this.ignore?.(line)) {
-				continue;
-			}
-
-			return line;
-		}
-	}
-}