47 lines
1.8 KiB
JavaScript
47 lines
1.8 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.readBufferedLines = void 0;
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const LINE_TOKENIZER_REGEXP = /[^\n]+\n?|\n/g;
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/**
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* Reads lines from given buffer.
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* @param buf Buffer to read lines from.
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* @param size Size of data available in buffer.
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* @param allocatedBufferSize Maximum buffer storage.
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* @param rest Part of a line that was split at buffer boundary in a previous read.
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* Will be added to result.
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* @param restLines Lines that remain unprocessed from a previous read due to unbalanced buffers.
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* Will be added to result.
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*/
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function readBufferedLines(buf, size, allocatedBufferSize, rest, restLines) {
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if (size === 0 && rest.length === 0) {
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return { lines: [...restLines], rest: '', reachedEof: true };
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}
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if (size === 0) {
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return { lines: [...restLines, rest], rest: '', reachedEof: true };
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}
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const fileContent = rest + buf.toString('utf8', 0, size);
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const lines = [...restLines, ...fileContent.match(LINE_TOKENIZER_REGEXP)];
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const reachedEof = size < allocatedBufferSize;
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if (reachedEof) {
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return {
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lines, rest: '', reachedEof: true
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};
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}
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return removeLastLine(lines);
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}
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exports.readBufferedLines = readBufferedLines;
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/**
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* Last line is usually incomplete because our buffer rarely matches exactly the end of a line.
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* So we remove it from the line batch.
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* The deleted line is returned as the 'rest' parameter and will be incorporate at the beginning
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* of next read operation.
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*/
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function removeLastLine(lines) {
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const lastLine = lines[lines.length - 1];
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return {
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lines: lines.slice(0, lines.length - 1),
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rest: lastLine,
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reachedEof: false
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};
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}
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//# sourceMappingURL=readBufferedLines.js.map
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