| 1 | /**
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| 2 | * @typedef {import('unist').Node} Node
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| 3 | * @typedef {import('unist').Point} Point
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| 4 | * @typedef {import('unist').Position} Position
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| 5 | */
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| 6 |
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| 7 | /**
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| 8 | * @typedef NodeLike
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| 9 | * @property {string} type
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| 10 | * @property {PositionLike | null | undefined} [position]
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| 11 | *
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| 12 | * @typedef PositionLike
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| 13 | * @property {PointLike | null | undefined} [start]
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| 14 | * @property {PointLike | null | undefined} [end]
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| 15 | *
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| 16 | * @typedef PointLike
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| 17 | * @property {number | null | undefined} [line]
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| 18 | * @property {number | null | undefined} [column]
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| 19 | * @property {number | null | undefined} [offset]
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| 20 | */
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| 21 |
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| 22 | /**
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| 23 | * Get the ending point of `node`.
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| 24 | *
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| 25 | * @param node
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| 26 | * Node.
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| 27 | * @returns
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| 28 | * Point.
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| 29 | */
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| 30 | export const pointEnd = point('end')
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| 31 |
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| 32 | /**
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| 33 | * Get the starting point of `node`.
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| 34 | *
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| 35 | * @param node
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| 36 | * Node.
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| 37 | * @returns
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| 38 | * Point.
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| 39 | */
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| 40 | export const pointStart = point('start')
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| 41 |
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| 42 | /**
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| 43 | * Get the positional info of `node`.
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| 44 | *
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| 45 | * @param {'end' | 'start'} type
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| 46 | * Side.
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| 47 | * @returns
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| 48 | * Getter.
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| 49 | */
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| 50 | function point(type) {
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| 51 | return point
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| 52 |
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| 53 | /**
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| 54 | * Get the point info of `node` at a bound side.
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| 55 | *
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| 56 | * @param {Node | NodeLike | null | undefined} [node]
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| 57 | * @returns {Point | undefined}
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| 58 | */
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| 59 | function point(node) {
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| 60 | const point = (node && node.position && node.position[type]) || {}
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| 61 |
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| 62 | if (
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| 63 | typeof point.line === 'number' &&
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| 64 | point.line > 0 &&
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| 65 | typeof point.column === 'number' &&
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| 66 | point.column > 0
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| 67 | ) {
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| 68 | return {
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| 69 | line: point.line,
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| 70 | column: point.column,
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| 71 | offset:
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| 72 | typeof point.offset === 'number' && point.offset > -1
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| 73 | ? point.offset
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| 74 | : undefined
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| 75 | }
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| 76 | }
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| 77 | }
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| 78 | }
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| 79 |
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| 80 | /**
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| 81 | * Get the positional info of `node`.
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| 82 | *
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| 83 | * @param {Node | NodeLike | null | undefined} [node]
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| 84 | * Node.
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| 85 | * @returns {Position | undefined}
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| 86 | * Position.
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| 87 | */
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| 88 | export function position(node) {
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| 89 | const start = pointStart(node)
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| 90 | const end = pointEnd(node)
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| 91 |
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| 92 | if (start && end) {
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| 93 | return {start, end}
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| 94 | }
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| 95 | }
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