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57 lines
1.7 KiB
Text
57 lines
1.7 KiB
Text
/**
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* @typedef {import('unist').Node} Node
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* @typedef {import('unist').Parent} Parent
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* @typedef {import('unist-util-is').Test} Test
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* @typedef {import('unist-util-visit-parents').VisitorResult} VisitorResult
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* @typedef {import('./complex-types').Visitor} Visitor
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*/
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import {visitParents, CONTINUE, SKIP, EXIT} from 'unist-util-visit-parents'
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export {CONTINUE, SKIP, EXIT}
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/**
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* Visit children of tree which pass a test
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*
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* @param tree Abstract syntax tree to walk
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* @param test Test, optional
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* @param visitor Function to run for each node
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* @param reverse Fisit the tree in reverse, defaults to false
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*/
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export const visit =
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/**
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* @type {(
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* (<Tree extends Node, Check extends Test>(tree: Tree, test: Check, visitor: import('./complex-types').BuildVisitor<Tree, Check>, reverse?: boolean) => void) &
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* (<Tree extends Node>(tree: Tree, visitor: import('./complex-types').BuildVisitor<Tree>, reverse?: boolean) => void)
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* )}
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*/
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(
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/**
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* @param {Node} tree
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* @param {Test} test
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* @param {import('./complex-types').Visitor} visitor
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* @param {boolean} [reverse]
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*/
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function (tree, test, visitor, reverse) {
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if (typeof test === 'function' && typeof visitor !== 'function') {
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reverse = visitor
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visitor = test
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test = null
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}
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visitParents(tree, test, overload, reverse)
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/**
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* @param {Node} node
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* @param {Array.<Parent>} parents
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*/
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function overload(node, parents) {
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const parent = parents[parents.length - 1]
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return visitor(
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node,
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parent ? parent.children.indexOf(node) : null,
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parent
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)
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}
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}
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)
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