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go/buildutil: FakeContext: create build.Context of fake file tree, fo…
…r testing This refactoring of the tests of go/loader and refactor/rename made it possible to write some loader tests I wanted, but the new tests reveal bugs so they're commented out for now. I will fix them in a follow-up. Change-Id: Iae3a20681a0a0791076debd4b82bb5ed74b0c577 Reviewed-on: https://go-review.googlesource.com/2825 Reviewed-by: Robert Griesemer <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package buildutil | ||
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| import ( | ||
| "fmt" | ||
| "go/build" | ||
| "io" | ||
| "io/ioutil" | ||
| "os" | ||
| "path" | ||
| "path/filepath" | ||
| "sort" | ||
| "strings" | ||
| "time" | ||
| ) | ||
|
|
||
| // FakeContext returns a build.Context for the fake file tree specified | ||
| // by pkgs, which maps package import paths to a mapping from file base | ||
| // names to contents. | ||
| // | ||
| // The fake Context has a GOROOT of "/go" and no GOPATH, and overrides | ||
| // the necessary file access methods to read from memory instead of the | ||
| // real file system. | ||
| // | ||
| // Unlike a real file tree, the fake one has only two levels---packages | ||
| // and files---so ReadDir("/go/src/") returns all packages under | ||
| // /go/src/ including, for instance, "math" and "math/big". | ||
| // ReadDir("/go/src/math/big") would return all the files in the | ||
| // "math/big" package. | ||
| // | ||
| func FakeContext(pkgs map[string]map[string]string) *build.Context { | ||
| clean := func(filename string) string { | ||
| f := path.Clean(filepath.ToSlash(filename)) | ||
| // Removing "/go/src" while respecting segment | ||
| // boundaries has this unfortunate corner case: | ||
| if f == "/go/src" { | ||
| return "" | ||
| } | ||
| return strings.TrimPrefix(f, "/go/src/") | ||
| } | ||
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| ctxt := build.Default // copy | ||
| ctxt.GOROOT = "/go" | ||
| ctxt.GOPATH = "" | ||
| ctxt.IsDir = func(dir string) bool { | ||
| dir = clean(dir) | ||
| if dir == "" { | ||
| return true // needed by (*build.Context).SrcDirs | ||
| } | ||
| return pkgs[dir] != nil | ||
| } | ||
| ctxt.ReadDir = func(dir string) ([]os.FileInfo, error) { | ||
| dir = clean(dir) | ||
| var fis []os.FileInfo | ||
| if dir == "" { | ||
| // enumerate packages | ||
| for importPath := range pkgs { | ||
| fis = append(fis, fakeDirInfo(importPath)) | ||
| } | ||
| } else { | ||
| // enumerate files of package | ||
| for basename := range pkgs[dir] { | ||
| fis = append(fis, fakeFileInfo(basename)) | ||
| } | ||
| } | ||
| sort.Sort(byName(fis)) | ||
| return fis, nil | ||
| } | ||
| ctxt.OpenFile = func(filename string) (io.ReadCloser, error) { | ||
| filename = clean(filename) | ||
| dir, base := filepath.Split(filename) | ||
| content, ok := pkgs[filepath.Clean(dir)][base] | ||
| if !ok { | ||
| return nil, fmt.Errorf("file not found: %s", filename) | ||
| } | ||
| return ioutil.NopCloser(strings.NewReader(content)), nil | ||
| } | ||
| ctxt.IsAbsPath = func(path string) bool { | ||
| path = filepath.ToSlash(path) | ||
| // Don't rely on the default (filepath.Path) since on | ||
| // Windows, it reports virtual paths as non-absolute. | ||
| return strings.HasPrefix(path, "/") | ||
| } | ||
| return &ctxt | ||
| } | ||
|
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| type byName []os.FileInfo | ||
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| func (s byName) Len() int { return len(s) } | ||
| func (s byName) Swap(i, j int) { s[i], s[j] = s[j], s[i] } | ||
| func (s byName) Less(i, j int) bool { return s[i].Name() < s[j].Name() } | ||
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| type fakeFileInfo string | ||
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| func (fi fakeFileInfo) Name() string { return string(fi) } | ||
| func (fakeFileInfo) Sys() interface{} { return nil } | ||
| func (fakeFileInfo) ModTime() time.Time { return time.Time{} } | ||
| func (fakeFileInfo) IsDir() bool { return false } | ||
| func (fakeFileInfo) Size() int64 { return 0 } | ||
| func (fakeFileInfo) Mode() os.FileMode { return 0644 } | ||
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| type fakeDirInfo string | ||
|
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| func (fd fakeDirInfo) Name() string { return string(fd) } | ||
| func (fakeDirInfo) Sys() interface{} { return nil } | ||
| func (fakeDirInfo) ModTime() time.Time { return time.Time{} } | ||
| func (fakeDirInfo) IsDir() bool { return true } | ||
| func (fakeDirInfo) Size() int64 { return 0 } | ||
| func (fakeDirInfo) Mode() os.FileMode { return 0755 } |
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