65 lines
1.6 KiB
JavaScript
65 lines
1.6 KiB
JavaScript
/**
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* @typedef {import('micromark-util-types').Event} Event
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*/
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/**
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* @typedef {'center' | 'left' | 'none' | 'right'} Align
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*/
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import {ok as assert} from 'devlop'
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/**
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* Figure out the alignment of a GFM table.
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*
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* @param {Readonly<Array<Event>>} events
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* List of events.
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* @param {number} index
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* Table enter event.
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* @returns {Array<Align>}
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* List of aligns.
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*/
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export function gfmTableAlign(events, index) {
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assert(events[index][1].type === 'table', 'expected table')
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let inDelimiterRow = false
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/** @type {Array<Align>} */
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const align = []
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while (index < events.length) {
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const event = events[index]
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if (inDelimiterRow) {
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if (event[0] === 'enter') {
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// Start of alignment value: set a new column.
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// To do: `markdown-rs` uses `tableDelimiterCellValue`.
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if (event[1].type === 'tableContent') {
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align.push(
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events[index + 1][1].type === 'tableDelimiterMarker'
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? 'left'
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: 'none'
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)
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}
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}
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// Exits:
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// End of alignment value: change the column.
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// To do: `markdown-rs` uses `tableDelimiterCellValue`.
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else if (event[1].type === 'tableContent') {
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if (events[index - 1][1].type === 'tableDelimiterMarker') {
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const alignIndex = align.length - 1
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align[alignIndex] = align[alignIndex] === 'left' ? 'center' : 'right'
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}
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}
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// Done!
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else if (event[1].type === 'tableDelimiterRow') {
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break
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}
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} else if (event[0] === 'enter' && event[1].type === 'tableDelimiterRow') {
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inDelimiterRow = true
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}
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index += 1
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}
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return align
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}
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