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29 lines
842 B
Plaintext
29 lines
842 B
Plaintext
import { Transform } from './index.js';
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import { Block, Line } from '../primitives.js';
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import { rewireSource } from '../util.js';
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const pull = (offset: number) => (str) => str.slice(offset);
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const push = (offset: number) => {
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const space = ''.padStart(offset, ' ');
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return (str) => str + space;
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};
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export default function indent(pos: number): Transform {
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let shift: (string: string) => string;
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const pad = (start: string) => {
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if (shift === undefined) {
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const offset = pos - start.length;
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shift = offset > 0 ? push(offset) : pull(-offset);
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}
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return shift(start);
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};
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const update = (line: Line): Line => ({
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...line,
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tokens: { ...line.tokens, start: pad(line.tokens.start) },
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});
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return ({ source, ...fields }: Block): Block =>
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rewireSource({ ...fields, source: source.map(update) });
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}
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