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36 lines
885 B
JavaScript
36 lines
885 B
JavaScript
'use strict'
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var convert = require('./convert')
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module.exports = isElement
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isElement.convert = convert
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// Check if if `node` is an `element` and whether it passes the given test.
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function isElement(node, test, index, parent, context) {
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var hasParent = parent !== null && parent !== undefined
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var hasIndex = index !== null && index !== undefined
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var check = convert(test)
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if (
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hasIndex &&
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(typeof index !== 'number' || index < 0 || index === Infinity)
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) {
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throw new Error('Expected positive finite index for child node')
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}
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if (hasParent && (!parent.type || !parent.children)) {
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throw new Error('Expected parent node')
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}
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if (!node || !node.type || typeof node.type !== 'string') {
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return false
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}
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if (hasParent !== hasIndex) {
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throw new Error('Expected both parent and index')
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}
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return check.call(context, node, index, parent)
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}
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