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// Copyright 2025 The CUE Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package load
import (
"fmt"
"io/fs"
"path"
"sync"
"cuelang.org/go/mod/modfile"
"cuelang.org/go/mod/module"
)
type modFileCache struct {
mu sync.Mutex
modfiles map[module.Version]*modfile.File
}
func newModFileCache() *modFileCache {
return &modFileCache{
modfiles: make(map[module.Version]*modfile.File),
}
}
func (mc *modFileCache) modFile(mv module.Version, loc module.SourceLoc) (*modfile.File, error) {
mc.mu.Lock()
defer mc.mu.Unlock()
if loc.FS == nil {
return nil, fmt.Errorf("no location for %v", mv)
}
if f := mc.modfiles[mv]; f != nil {
return f, nil
}
data, err := fs.ReadFile(loc.FS, path.Join(loc.Dir, "cue.mod/module.cue"))
if err != nil {
return nil, err
}
f, err := modfile.Parse(data, "cue.mod/module.cue")
if err != nil {
return nil, fmt.Errorf("%v: %v", mv, err)
}
mc.modfiles[mv] = f
return f, nil
}
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