/
match.go
99 lines (85 loc) · 2.77 KB
/
match.go
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// Copyright 2018 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 (
"io"
"path/filepath"
"strings"
"cuelang.org/go/cue/build"
"cuelang.org/go/cue/errors"
"cuelang.org/go/cue/token"
)
// A match represents the result of matching a single package pattern.
type match struct {
Pattern string // the pattern itself
Literal bool // whether it is a literal (no wildcards)
Pkgs []*build.Instance
Err errors.Error
}
var errExclude = errors.New("file rejected")
type cueError = errors.Error
type excludeError struct {
cueError
}
func (e excludeError) Is(err error) bool { return err == errExclude }
// matchFile determines whether the file with the given name in the given directory
// should be included in the package being constructed.
// It returns the data read from the file.
// If returnImports is true and name denotes a CUE file, matchFile reads
// until the end of the imports (and returns that data) even though it only
// considers text until the first non-comment.
// If allTags is non-nil, matchFile records any encountered build tag
// by setting allTags[tag] = true.
func matchFile(cfg *Config, file *build.File, returnImports, allFiles bool, allTags map[string]bool) (match bool, data []byte, err errors.Error) {
if fi := cfg.fileSystem.getOverlay(file.Filename); fi != nil {
if fi.file != nil {
file.Source = fi.file
} else {
file.Source = fi.contents
}
}
if file.Encoding != build.CUE {
return false, nil, nil // not a CUE file, don't record.
}
if file.Filename == "-" {
b, err2 := io.ReadAll(cfg.stdin())
if err2 != nil {
err = errors.Newf(token.NoPos, "read stdin: %v", err)
return
}
file.Source = b
return true, b, nil // don't check shouldBuild for stdin
}
name := filepath.Base(file.Filename)
if !cfg.filesMode {
for _, prefix := range []string{".", "_"} {
if strings.HasPrefix(name, prefix) {
return false, nil, &excludeError{
errors.Newf(token.NoPos, "filename starts with a '%s'", prefix),
}
}
}
}
f, err := cfg.fileSystem.openFile(file.Filename)
if err != nil {
return false, nil, err
}
data, err = readImports(f, false, nil)
f.Close()
if err != nil {
return false, nil,
errors.Newf(token.NoPos, "read %s: %v", file.Filename, err)
}
return true, data, nil
}