| // 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/ioutil" |
| "path/filepath" |
| "strings" |
| "unicode" |
| |
| "cuelang.org/go/cue/build" |
| "cuelang.org/go/cue/errors" |
| "cuelang.org/go/cue/token" |
| ) |
| |
| // 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 |
| } |
| |
| if file.Filename == "-" { |
| b, err2 := ioutil.ReadAll(cfg.stdin()) |
| if err2 != nil { |
| err = errors.Newf(token.NoPos, "read stdin: %v", err) |
| return |
| } |
| file.Source = b |
| data = b |
| match = true // don't check shouldBuild for stdin |
| return |
| } |
| |
| name := filepath.Base(file.Filename) |
| if !cfg.filesMode && strings.HasPrefix(name, ".") { |
| return |
| } |
| |
| if strings.HasPrefix(name, "_") { |
| return |
| } |
| |
| f, err := cfg.fileSystem.openFile(file.Filename) |
| if err != nil { |
| return |
| } |
| |
| data, err = readImports(f, false, nil) |
| f.Close() |
| if err != nil { |
| err = errors.Newf(token.NoPos, "read %s: %v", file.Filename, err) |
| return |
| } |
| |
| match = true |
| return |
| } |
| |
| // doMatch reports whether the name is one of: |
| // |
| // tag (if tag is listed in cfg.Build.BuildTags or cfg.Build.ReleaseTags) |
| // !tag (if tag is not listed in cfg.Build.BuildTags or cfg.Build.ReleaseTags) |
| // a comma-separated list of any of these |
| // |
| func doMatch(cfg *Config, name string, allTags map[string]bool) bool { |
| if name == "" { |
| if allTags != nil { |
| allTags[name] = true |
| } |
| return false |
| } |
| if i := strings.Index(name, ","); i >= 0 { |
| // comma-separated list |
| ok1 := doMatch(cfg, name[:i], allTags) |
| ok2 := doMatch(cfg, name[i+1:], allTags) |
| return ok1 && ok2 |
| } |
| if strings.HasPrefix(name, "!!") { // bad syntax, reject always |
| return false |
| } |
| if strings.HasPrefix(name, "!") { // negation |
| return len(name) > 1 && !doMatch(cfg, name[1:], allTags) |
| } |
| |
| if allTags != nil { |
| allTags[name] = true |
| } |
| |
| // Tags must be letters, digits, underscores or dots. |
| // Unlike in CUE identifiers, all digits are fine (e.g., "386"). |
| for _, c := range name { |
| if !unicode.IsLetter(c) && !unicode.IsDigit(c) && c != '_' && c != '.' { |
| return false |
| } |
| } |
| |
| // other tags |
| for _, tag := range cfg.BuildTags { |
| if tag == name { |
| return true |
| } |
| } |
| for _, tag := range cfg.releaseTags { |
| if tag == name { |
| return true |
| } |
| } |
| |
| return false |
| } |