58 lines
1.4 KiB
JavaScript
58 lines
1.4 KiB
JavaScript
/**
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* @typedef {import('../types.js').CreateTracker} CreateTracker
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* @typedef {import('../types.js').TrackCurrent} TrackCurrent
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* @typedef {import('../types.js').TrackMove} TrackMove
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* @typedef {import('../types.js').TrackShift} TrackShift
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*/
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/**
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* Track positional info in the output.
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*
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* @type {CreateTracker}
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*/
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export function track(config) {
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// Defaults are used to prevent crashes when older utilities somehow activate
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// this code.
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/* c8 ignore next 5 */
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const options = config || {}
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const now = options.now || {}
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let lineShift = options.lineShift || 0
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let line = now.line || 1
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let column = now.column || 1
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return {move, current, shift}
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/**
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* Get the current tracked info.
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*
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* @type {TrackCurrent}
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*/
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function current() {
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return {now: {line, column}, lineShift}
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}
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/**
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* Define an increased line shift (the typical indent for lines).
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*
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* @type {TrackShift}
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*/
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function shift(value) {
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lineShift += value
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}
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/**
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* Move past some generated markdown.
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*
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* @type {TrackMove}
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*/
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function move(input) {
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// eslint-disable-next-line unicorn/prefer-default-parameters
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const value = input || ''
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const chunks = value.split(/\r?\n|\r/g)
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const tail = chunks[chunks.length - 1]
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line += chunks.length - 1
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column =
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chunks.length === 1 ? column + tail.length : 1 + tail.length + lineShift
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return value
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}
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}
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