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index.js
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index.js
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/**
* @typedef Options
* @property {string|null|Array<string|null|undefined>} [align]
* @property {boolean} [padding=true]
* @property {boolean} [delimiterStart=true]
* @property {boolean} [delimiterStart=true]
* @property {boolean} [delimiterEnd=true]
* @property {boolean} [alignDelimiters=true]
* @property {(value: string) => number} [stringLength]
*/
/**
* @typedef {Options} MarkdownTableOptions
* @todo
* Remove next major.
*/
/**
* Create a table from a matrix of strings.
*
* @param {Array<Array<string|null|undefined>>} table
* @param {Options} [options]
* @returns {string}
*/
export function markdownTable(table, options = {}) {
const align = (options.align || []).concat()
const stringLength = options.stringLength || defaultStringLength
/** @type {Array<number>} Character codes as symbols for alignment per column. */
const alignments = []
/** @type {Array<Array<string>>} Cells per row. */
const cellMatrix = []
/** @type {Array<Array<number>>} Sizes of each cell per row. */
const sizeMatrix = []
/** @type {Array<number>} */
const longestCellByColumn = []
let mostCellsPerRow = 0
let rowIndex = -1
// This is a superfluous loop if we don’t align delimiters, but otherwise we’d
// do superfluous work when aligning, so optimize for aligning.
while (++rowIndex < table.length) {
/** @type {Array<string>} */
const row = []
/** @type {Array<number>} */
const sizes = []
let columnIndex = -1
if (table[rowIndex].length > mostCellsPerRow) {
mostCellsPerRow = table[rowIndex].length
}
while (++columnIndex < table[rowIndex].length) {
const cell = serialize(table[rowIndex][columnIndex])
if (options.alignDelimiters !== false) {
const size = stringLength(cell)
sizes[columnIndex] = size
if (
longestCellByColumn[columnIndex] === undefined ||
size > longestCellByColumn[columnIndex]
) {
longestCellByColumn[columnIndex] = size
}
}
row.push(cell)
}
cellMatrix[rowIndex] = row
sizeMatrix[rowIndex] = sizes
}
// Figure out which alignments to use.
let columnIndex = -1
if (typeof align === 'object' && 'length' in align) {
while (++columnIndex < mostCellsPerRow) {
alignments[columnIndex] = toAlignment(align[columnIndex])
}
} else {
const code = toAlignment(align)
while (++columnIndex < mostCellsPerRow) {
alignments[columnIndex] = code
}
}
// Inject the alignment row.
columnIndex = -1
/** @type {Array<string>} */
const row = []
/** @type {Array<number>} */
const sizes = []
while (++columnIndex < mostCellsPerRow) {
const code = alignments[columnIndex]
let before = ''
let after = ''
if (code === 99 /* `c` */) {
before = ':'
after = ':'
} else if (code === 108 /* `l` */) {
before = ':'
} else if (code === 114 /* `r` */) {
after = ':'
}
// There *must* be at least one hyphen-minus in each alignment cell.
let size =
options.alignDelimiters === false
? 1
: Math.max(
1,
longestCellByColumn[columnIndex] - before.length - after.length
)
const cell = before + '-'.repeat(size) + after
if (options.alignDelimiters !== false) {
size = before.length + size + after.length
if (size > longestCellByColumn[columnIndex]) {
longestCellByColumn[columnIndex] = size
}
sizes[columnIndex] = size
}
row[columnIndex] = cell
}
// Inject the alignment row.
cellMatrix.splice(1, 0, row)
sizeMatrix.splice(1, 0, sizes)
rowIndex = -1
/** @type {Array<string>} */
const lines = []
while (++rowIndex < cellMatrix.length) {
const row = cellMatrix[rowIndex]
const sizes = sizeMatrix[rowIndex]
columnIndex = -1
/** @type {Array<string>} */
const line = []
while (++columnIndex < mostCellsPerRow) {
const cell = row[columnIndex] || ''
let before = ''
let after = ''
if (options.alignDelimiters !== false) {
const size =
longestCellByColumn[columnIndex] - (sizes[columnIndex] || 0)
const code = alignments[columnIndex]
if (code === 114 /* `r` */) {
before = ' '.repeat(size)
} else if (code === 99 /* `c` */) {
if (size % 2) {
before = ' '.repeat(size / 2 + 0.5)
after = ' '.repeat(size / 2 - 0.5)
} else {
before = ' '.repeat(size / 2)
after = before
}
} else {
after = ' '.repeat(size)
}
}
if (options.delimiterStart !== false && !columnIndex) {
line.push('|')
}
if (
options.padding !== false &&
// Don’t add the opening space if we’re not aligning and the cell is
// empty: there will be a closing space.
!(options.alignDelimiters === false && cell === '') &&
(options.delimiterStart !== false || columnIndex)
) {
line.push(' ')
}
if (options.alignDelimiters !== false) {
line.push(before)
}
line.push(cell)
if (options.alignDelimiters !== false) {
line.push(after)
}
if (options.padding !== false) {
line.push(' ')
}
if (
options.delimiterEnd !== false ||
columnIndex !== mostCellsPerRow - 1
) {
line.push('|')
}
}
lines.push(
options.delimiterEnd === false
? line.join('').replace(/ +$/, '')
: line.join('')
)
}
return lines.join('\n')
}
/**
* @param {string|null|undefined} [value]
* @returns {string}
*/
function serialize(value) {
return value === null || value === undefined ? '' : String(value)
}
/**
* @param {string} value
* @returns {number}
*/
function defaultStringLength(value) {
return value.length
}
/**
* @param {string|null|undefined} value
* @returns {number}
*/
function toAlignment(value) {
const code = typeof value === 'string' ? value.codePointAt(0) : 0
return code === 67 /* `C` */ || code === 99 /* `c` */
? 99 /* `c` */
: code === 76 /* `L` */ || code === 108 /* `l` */
? 108 /* `l` */
: code === 82 /* `R` */ || code === 114 /* `r` */
? 114 /* `r` */
: 0
}