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39 lines
903 B
JavaScript
39 lines
903 B
JavaScript
/**
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* @typedef {import('nlcst').Nodes} Nodes
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*/
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/** @type {Readonly<Array<Nodes>>} */
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const emptyNodes = []
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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 {Array<Nodes> | Nodes} value
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* Node or list of nodes to serialize.
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* @returns {string}
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* Result.
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*/
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export function toString(value) {
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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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if ('value' in value) return value.value
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const children = (Array.isArray(value) ? value : value.children) || emptyNodes
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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])
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}
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return values.join('')
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}
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