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// SPDX-FileCopyrightText: 2026 Stefan Majewsky <majewsky@gmx.net>
// SPDX-License-Identifier: Apache-2.0
package pathrouter
import (
"slices"
. "go.xyrillian.de/gg/option"
"go.xyrillian.de/gg/options"
)
// Choice is a [Matcher] that accepts all subpaths that are accepted by any of its contained matchers.
// If multiple matchers accept the requested subpath, the first match wins.
//
// Choice is used to specify different matchers for different subpaths,
// as illustrated in the example in the package docstring.
func Choice(matchers ...Matcher) Matcher {
downcasted := make([]realMatcher, len(matchers))
for idx, matcher := range matchers {
downcasted[idx] = matcher.downcast()
}
return choice(downcasted)
}
func choice(matchers []realMatcher) Matcher {
if len(matchers) == 0 {
panic("Choice() called without any matchers")
}
var (
minLengths = make([]int, len(matchers))
maxLengths = make([]Option[int], len(matchers))
maxLengthIsInf = false
)
for idx, m := range matchers {
minLengths[idx] = m.minLength
maxLengths[idx] = m.maxLength
if m.maxLength.IsNone() {
maxLengthIsInf = true
}
}
maxLength := None[int]()
if !maxLengthIsInf {
maxLength = options.Max(maxLengths...)
}
return realMatcher{
minLength: slices.Min(minLengths),
maxLength: maxLength,
accept: func(path []string, vars map[string]string) HandlerFunc {
for _, m := range matchers {
hf := m.accept(path, vars)
if hf != nil {
return hf
}
}
return nil
},
}
}
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