xiaoyu
63 lines
1.3 KiB
JavaScript
63 lines
1.3 KiB
JavaScript
/**
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* @typedef {import('unist').Point} Point
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* @typedef {import('unist').Node} Node
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* @typedef {import('unist').Position} Position
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* @typedef {object & {type: string, position?: Position|undefined}} NodeLike
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*/
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/**
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* Stringify one point, a position (start and end points), or a node’s
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* positional information.
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*
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* @param {Node|NodeLike|Position|Point|null} [value]
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* @returns {string}
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*/
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export function stringifyPosition(value) {
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// Nothing.
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if (!value || typeof value !== 'object') {
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return ''
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}
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// Node.
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if ('position' in value || 'type' in value) {
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return position(value.position)
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}
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// Position.
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if ('start' in value || 'end' in value) {
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return position(value)
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}
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// Point.
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if ('line' in value || 'column' in value) {
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return point(value)
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}
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// ?
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return ''
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}
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/**
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* @param {Point|undefined} point
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* @returns {string}
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*/
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function point(point) {
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return index(point && point.line) + ':' + index(point && point.column)
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}
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/**
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* @param {Position|undefined} pos
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* @returns {string}
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*/
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function position(pos) {
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return point(pos && pos.start) + '-' + point(pos && pos.end)
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}
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/**
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* @param {number|undefined} value
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* @returns {number}
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*/
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function index(value) {
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return value && typeof value === 'number' ? value : 1
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}
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