50 lines
1.1 KiB
JavaScript
50 lines
1.1 KiB
JavaScript
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/**
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* @typedef {import('hast').Nodes} Nodes
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* @typedef {import('hast').Parents} Parents
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*
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* @typedef {import('../index.js').State} State
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*/
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import {zwitch} from 'zwitch'
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import {comment} from './comment.js'
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import {doctype} from './doctype.js'
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import {element} from './element.js'
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import {raw} from './raw.js'
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import {root} from './root.js'
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import {text} from './text.js'
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/**
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* @type {(node: Nodes, index: number | undefined, parent: Parents | undefined, state: State) => string}
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*/
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export const handle = zwitch('type', {
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invalid,
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unknown,
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handlers: {comment, doctype, element, raw, root, text}
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})
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/**
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* Fail when a non-node is found in the tree.
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*
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* @param {unknown} node
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* Unknown value.
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* @returns {never}
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* Never.
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*/
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function invalid(node) {
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throw new Error('Expected node, not `' + node + '`')
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}
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/**
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* Fail when a node with an unknown type is found in the tree.
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*
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* @param {unknown} node_
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* Unknown node.
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* @returns {never}
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* Never.
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*/
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function unknown(node_) {
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// `type` is guaranteed by runtime JS.
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const node = /** @type {Nodes} */ (node_)
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throw new Error('Cannot compile unknown node `' + node.type + '`')
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}
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