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35 lines
1.3 KiB
JavaScript
35 lines
1.3 KiB
JavaScript
"use strict";
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const assureArray = require("assure-array");
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const combinator = require("@validatem/combinator");
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const allowExtraProperties = require("@validatem/allow-extra-properties");
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// TODO: Document that this passes on context
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// TODO: Clearly document that the predicate is ALSO called when the value is not specified!
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module.exports = function (predicate, rules) {
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if (rules == null) {
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// User probably did `[ when(condition), [ rules ] ]` instead of `[ when(condition, [ rules ]) ]`
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throw new Error("No rules specified for a `when` validation clause; did you misplace a parenthese?");
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} else {
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let preparedRules = assureArray(rules).map((rule) => {
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/* We automatically allow extraneous properties in a `when` clause, because it'll generally be used as a partial addition to an otherwise-fully-specified object structure. This can be overridden by using `withContext` explicitly, wrapped directly around the hasShape or object literal. */
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// TODO: Document this.
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return allowExtraProperties(rule);
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});
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return combinator((value, applyValidators, context) => {
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let matches = predicate(value);
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if (matches) {
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// TODO: Translate this to a configuration wrapper approach, too?
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return applyValidators(value, preparedRules, context);
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} else {
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// noop
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return;
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}
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});
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}
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};
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