47 lines
1.7 KiB
JavaScript
47 lines
1.7 KiB
JavaScript
import { Markers } from '../primitives.js';
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import { seedTokens, splitSpace, splitCR } from '../util.js';
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export default function getParser({ startLine = 0, markers = Markers, } = {}) {
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let block = null;
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let num = startLine;
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return function parseSource(source) {
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let rest = source;
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const tokens = seedTokens();
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[tokens.lineEnd, rest] = splitCR(rest);
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[tokens.start, rest] = splitSpace(rest);
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if (block === null &&
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rest.startsWith(markers.start) &&
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!rest.startsWith(markers.nostart)) {
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block = [];
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tokens.delimiter = rest.slice(0, markers.start.length);
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rest = rest.slice(markers.start.length);
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[tokens.postDelimiter, rest] = splitSpace(rest);
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}
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if (block === null) {
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num++;
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return null;
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}
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const isClosed = rest.trimRight().endsWith(markers.end);
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if (tokens.delimiter === '' &&
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rest.startsWith(markers.delim) &&
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!rest.startsWith(markers.end)) {
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tokens.delimiter = markers.delim;
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rest = rest.slice(markers.delim.length);
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[tokens.postDelimiter, rest] = splitSpace(rest);
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}
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if (isClosed) {
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const trimmed = rest.trimRight();
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tokens.end = rest.slice(trimmed.length - markers.end.length);
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rest = trimmed.slice(0, -markers.end.length);
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}
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tokens.description = rest;
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block.push({ number: num, source, tokens });
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num++;
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if (isClosed) {
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const result = block.slice();
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block = null;
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return result;
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}
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return null;
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};
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}
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