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// Copyright 2020 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 filetypes
import (
_ "embed"
"fmt"
"sync"
"cuelang.org/go/cue"
"cuelang.org/go/cue/build"
"cuelang.org/go/cue/cuecontext"
)
//go:embed types.cue
var typesCUE string
var (
typesValue cue.Value
fileForExt map[string]*build.File
fileForCUE *build.File
)
var typesInit = sync.OnceFunc(func() {
ctx := cuecontext.New()
typesValue = ctx.CompileString(typesCUE, cue.Filename("types.cue"))
if err := typesValue.Err(); err != nil {
panic(err)
}
// Reading a file in input mode with a non-explicit scope is a very
// common operation, so cache the build.File value for all
// the known file extensions.
if err := typesValue.LookupPath(cue.MakePath(cue.Str("fileForExtVanilla"))).Decode(&fileForExt); err != nil {
panic(err)
}
fileForCUE = fileForExt[".cue"]
// Check invariants assumed by FromFile
if fileForCUE.Form != "" || fileForCUE.Interpretation != "" || fileForCUE.Encoding != build.CUE {
panic(fmt.Errorf("unexpected value for CUE file type: %#v", fileForCUE))
}
})
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