52 lines
1.6 KiB
Dart
52 lines
1.6 KiB
Dart
import 'package:matcher/matcher.dart';
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/// Returns a [ContextAwareMatcher] for the given predicate.
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ContextAwareMatcher predicateWithContext(
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bool Function(Object, String, Map, Map) f,
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[String description = 'satisfies function']) {
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return _PredicateWithContext(f, description);
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}
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/// Wraps [x] in a [ContextAwareMatcher].
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ContextAwareMatcher wrapContextAwareMatcher(x) {
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if (x is ContextAwareMatcher) {
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return x;
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} else if (x is Matcher) return _WrappedContextAwareMatcher(x);
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return wrapContextAwareMatcher(wrapMatcher(x));
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}
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/// A special [Matcher] that is aware of the context in which it is being executed.
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abstract class ContextAwareMatcher extends Matcher {
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bool matchesWithContext(item, String key, Map context, Map matchState);
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@override
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bool matches(item, Map matchState) => true;
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}
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class _WrappedContextAwareMatcher extends ContextAwareMatcher {
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final Matcher matcher;
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_WrappedContextAwareMatcher(this.matcher);
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@override
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Description describe(Description description) =>
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matcher.describe(description);
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@override
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bool matchesWithContext(item, String key, Map context, Map matchState) =>
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matcher.matches(item, matchState);
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}
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class _PredicateWithContext extends ContextAwareMatcher {
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final bool Function(Object, String, Map, Map) f;
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final String desc;
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_PredicateWithContext(this.f, this.desc);
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@override
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Description describe(Description description) => description.add(desc);
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@override
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bool matchesWithContext(item, String key, Map context, Map matchState) =>
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f(item as Object, key, context, matchState);
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}
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