85 lines
2.1 KiB
JavaScript
85 lines
2.1 KiB
JavaScript
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/**
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* @typedef {import('unist').Node} Node
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* @typedef {import('unist').Point} Point
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* @typedef {import('unist').Position} Position
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*/
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/**
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* @typedef NodeLike
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* @property {string} type
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* @property {PositionLike | null | undefined} [position]
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*
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* @typedef PointLike
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* @property {number | null | undefined} [line]
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* @property {number | null | undefined} [column]
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* @property {number | null | undefined} [offset]
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*
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* @typedef PositionLike
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* @property {PointLike | null | undefined} [start]
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* @property {PointLike | null | undefined} [end]
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*/
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/**
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* Serialize the positional info of a point, position (start and end points),
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* or node.
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*
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* @param {Node | NodeLike | Point | PointLike | Position | PositionLike | null | undefined} [value]
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* Node, position, or point.
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* @returns {string}
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* Pretty printed positional info of a node (`string`).
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*
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* In the format of a range `ls:cs-le:ce` (when given `node` or `position`)
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* or a point `l:c` (when given `point`), where `l` stands for line, `c` for
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* column, `s` for `start`, and `e` for end.
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* An empty string (`''`) is returned if the given value is neither `node`,
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* `position`, nor `point`.
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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 | PointLike | null | 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 | PositionLike | null | 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 | null | 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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