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// Copyright 2019 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 (
"cuelang.org/go/cue/ast"
"cuelang.org/go/cue/format"
)
// A Source represents file contents.
type Source interface {
contents() ([]byte, *ast.File, error)
}
// FromString creates a Source from the given string.
func FromString(s string) Source {
return stringSource(s)
}
// FromBytes creates a Source from the given bytes. The contents are not
// copied and should not be modified.
func FromBytes(b []byte) Source {
return bytesSource(b)
}
// FromFile creates a Source from the given *ast.File. The file should not be
// modified. It is assumed the file is error-free.
func FromFile(f *ast.File) Source {
return (*fileSource)(f)
}
type stringSource string
func (s stringSource) contents() ([]byte, *ast.File, error) {
return []byte(s), nil, nil
}
type bytesSource []byte
func (s bytesSource) contents() ([]byte, *ast.File, error) {
return []byte(s), nil, nil
}
type fileSource ast.File
func (s *fileSource) contents() ([]byte, *ast.File, error) {
f := (*ast.File)(s)
// TODO: wasteful formatting, but needed for now.
b, err := format.Node(f)
return b, f, err
}
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