| 1 | var N = require('libnested')
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| 2 |
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| 3 | module.exports = function assertGiven (gives, given, key) {
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| 4 | if (!given) {
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| 5 | throw new Error('create function should return a function or an object in: ' + key)
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| 6 | }
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| 7 |
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| 8 | if (typeof gives === 'string' && typeof given !== 'function') {
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| 9 | throw new Error('create function should return a function when gives is a string in: ' + key)
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| 10 | } else if (isObject(gives) && isObject(given)) {
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| 11 | firstMissingKey(gives, given, function (path) {
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| 12 | throw new Error('keys returned by create must match keys in given. missing: ' + path.join('.') + ' in ' + key)
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| 13 | })
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| 14 | }
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| 15 | }
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| 16 |
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| 17 | function firstMissingKey (gives, given, onMissingKey) {
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| 18 | return N.each(gives, function (value, path) {
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| 19 | if (N.get(given, path) === undefined) {
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| 20 | onMissingKey(path)
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| 21 | return false
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| 22 | }
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| 23 | })
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| 24 | }
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| 25 |
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| 26 | function isObject (o) {
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| 27 | return o && typeof o === 'object'
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| 28 | }
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