sgauthier
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83 lines
1.4 KiB
JavaScript
83 lines
1.4 KiB
JavaScript
'use strict'
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module.exports = convert
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function convert(test) {
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if (typeof test === 'string') {
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return tagNameFactory(test)
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}
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if (test === null || test === undefined) {
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return element
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}
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if (typeof test === 'object') {
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return any(test)
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}
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if (typeof test === 'function') {
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return callFactory(test)
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}
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throw new Error('Expected function, string, or array as test')
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}
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function convertAll(tests) {
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var length = tests.length
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var index = -1
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var results = []
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while (++index < length) {
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results[index] = convert(tests[index])
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}
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return results
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}
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function any(tests) {
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var checks = convertAll(tests)
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var length = checks.length
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return matches
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function matches() {
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var index = -1
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while (++index < length) {
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if (checks[index].apply(this, arguments)) {
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return true
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}
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}
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return false
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}
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}
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// Utility to convert a string a tag name check.
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function tagNameFactory(test) {
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return tagName
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function tagName(node) {
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return element(node) && node.tagName === test
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}
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}
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// Utility to convert a function check.
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function callFactory(test) {
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return call
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function call(node) {
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return element(node) && Boolean(test.apply(this, arguments))
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}
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}
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// Utility to return true if this is an element.
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function element(node) {
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return (
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node &&
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typeof node === 'object' &&
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node.type === 'element' &&
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typeof node.tagName === 'string'
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)
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}
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