48 lines
1.3 KiB
JavaScript
48 lines
1.3 KiB
JavaScript
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/**
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* @typedef {import('nlcst').Content} Content
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* @typedef {import('nlcst').Root} Root
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*/
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/**
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* Get the text content of a node or list of nodes.
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*
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* Prefers the node’s plain-text fields, otherwise serializes its children, and
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* if the given value is an array, serialize the nodes in it.
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*
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* @param {Root | Content | Array<Content>} value
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* Node or list of nodes to serialize.
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* @param {string | null | undefined} [separator='']
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* Separator to use.
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* @returns {string}
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* Result.
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*/
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// To do next major: remove `separator`.
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export function toString(value, separator) {
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let index = -1
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if (!value || (!Array.isArray(value) && !value.type)) {
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throw new Error('Expected node, not `' + value + '`')
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}
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// @ts-expect-error Looks like a literal.
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if (typeof value.value === 'string') return value.value
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/** @type {Array<Content|Root>} */
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// @ts-expect-error Looks like a list of nodes or parent.
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const children = (Array.isArray(value) ? value : value.children) || []
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// Shortcut: This is pretty common, and a small performance win.
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if (children.length === 1 && 'value' in children[0]) {
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return children[0].value
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}
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/** @type {Array<string>} */
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const values = []
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while (++index < children.length) {
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values[index] = toString(children[index], separator)
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}
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return values.join(separator || '')
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}
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