| // Copyright 2011 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // gotype.go is a copy of the original source maintained |
| // in $GOROOT/src/go/types/gotype.go, but with the call |
| // to types.SizesFor factored out so we can provide a local |
| // implementation when compiling against Go 1.8 and earlier. |
| // |
| // This code is here for the sole purpose of satisfying historic |
| // references to this location, and for making gotype accessible |
| // via 'go get'. |
| // |
| // Do NOT make changes to this version as they will not be maintained |
| // (and possibly overwritten). Any changes should be made to the original |
| // and then ported to here. |
| |
| /* |
| The gotype command, like the front-end of a Go compiler, parses and |
| type-checks a single Go package. Errors are reported if the analysis |
| fails; otherwise gotype is quiet (unless -v is set). |
| |
| Without a list of paths, gotype reads from standard input, which |
| must provide a single Go source file defining a complete package. |
| |
| With a single directory argument, gotype checks the Go files in |
| that directory, comprising a single package. Use -t to include the |
| (in-package) _test.go files. Use -x to type check only external |
| test files. |
| |
| Otherwise, each path must be the filename of a Go file belonging |
| to the same package. |
| |
| Imports are processed by importing directly from the source of |
| imported packages (default), or by importing from compiled and |
| installed packages (by setting -c to the respective compiler). |
| |
| The -c flag must be set to a compiler ("gc", "gccgo") when type- |
| checking packages containing imports with relative import paths |
| (import "./mypkg") because the source importer cannot know which |
| files to include for such packages. |
| |
| Usage: |
| gotype [flags] [path...] |
| |
| The flags are: |
| -t |
| include local test files in a directory (ignored if -x is provided) |
| -x |
| consider only external test files in a directory |
| -e |
| report all errors (not just the first 10) |
| -v |
| verbose mode |
| -c |
| compiler used for installed packages (gc, gccgo, or source); default: source |
| |
| Flags controlling additional output: |
| -ast |
| print AST (forces -seq) |
| -trace |
| print parse trace (forces -seq) |
| -comments |
| parse comments (ignored unless -ast or -trace is provided) |
| |
| Examples: |
| |
| To check the files a.go, b.go, and c.go: |
| |
| gotype a.go b.go c.go |
| |
| To check an entire package including (in-package) tests in the directory dir and print the processed files: |
| |
| gotype -t -v dir |
| |
| To check the external test package (if any) in the current directory, based on installed packages compiled with |
| cmd/compile: |
| |
| gotype -c=gc -x . |
| |
| To verify the output of a pipe: |
| |
| echo "package foo" | gotype |
| |
| */ |
| package main |
| |
| import ( |
| "flag" |
| "fmt" |
| "go/ast" |
| "go/build" |
| "go/importer" |
| "go/parser" |
| "go/scanner" |
| "go/token" |
| "go/types" |
| "io/ioutil" |
| "os" |
| "path/filepath" |
| "sync" |
| "time" |
| ) |
| |
| var ( |
| // main operation modes |
| testFiles = flag.Bool("t", false, "include in-package test files in a directory") |
| xtestFiles = flag.Bool("x", false, "consider only external test files in a directory") |
| allErrors = flag.Bool("e", false, "report all errors, not just the first 10") |
| verbose = flag.Bool("v", false, "verbose mode") |
| compiler = flag.String("c", defaultCompiler, "compiler used for installed packages (gc, gccgo, or source)") |
| |
| // additional output control |
| printAST = flag.Bool("ast", false, "print AST (forces -seq)") |
| printTrace = flag.Bool("trace", false, "print parse trace (forces -seq)") |
| parseComments = flag.Bool("comments", false, "parse comments (ignored unless -ast or -trace is provided)") |
| ) |
| |
| var ( |
| fset = token.NewFileSet() |
| errorCount = 0 |
| sequential = false |
| parserMode parser.Mode |
| ) |
| |
| func initParserMode() { |
| if *allErrors { |
| parserMode |= parser.AllErrors |
| } |
| if *printAST { |
| sequential = true |
| } |
| if *printTrace { |
| parserMode |= parser.Trace |
| sequential = true |
| } |
| if *parseComments && (*printAST || *printTrace) { |
| parserMode |= parser.ParseComments |
| } |
| } |
| |
| const usageString = `usage: gotype [flags] [path ...] |
| |
| The gotype command, like the front-end of a Go compiler, parses and |
| type-checks a single Go package. Errors are reported if the analysis |
| fails; otherwise gotype is quiet (unless -v is set). |
| |
| Without a list of paths, gotype reads from standard input, which |
| must provide a single Go source file defining a complete package. |
| |
| With a single directory argument, gotype checks the Go files in |
| that directory, comprising a single package. Use -t to include the |
| (in-package) _test.go files. Use -x to type check only external |
| test files. |
| |
| Otherwise, each path must be the filename of a Go file belonging |
| to the same package. |
| |
| Imports are processed by importing directly from the source of |
| imported packages (default), or by importing from compiled and |
| installed packages (by setting -c to the respective compiler). |
| |
| The -c flag must be set to a compiler ("gc", "gccgo") when type- |
| checking packages containing imports with relative import paths |
| (import "./mypkg") because the source importer cannot know which |
| files to include for such packages. |
| ` |
| |
| func usage() { |
| fmt.Fprintln(os.Stderr, usageString) |
| flag.PrintDefaults() |
| os.Exit(2) |
| } |
| |
| func report(err error) { |
| scanner.PrintError(os.Stderr, err) |
| if list, ok := err.(scanner.ErrorList); ok { |
| errorCount += len(list) |
| return |
| } |
| errorCount++ |
| } |
| |
| // parse may be called concurrently |
| func parse(filename string, src interface{}) (*ast.File, error) { |
| if *verbose { |
| fmt.Println(filename) |
| } |
| file, err := parser.ParseFile(fset, filename, src, parserMode) // ok to access fset concurrently |
| if *printAST { |
| ast.Print(fset, file) |
| } |
| return file, err |
| } |
| |
| func parseStdin() (*ast.File, error) { |
| src, err := ioutil.ReadAll(os.Stdin) |
| if err != nil { |
| return nil, err |
| } |
| return parse("<standard input>", src) |
| } |
| |
| func parseFiles(dir string, filenames []string) ([]*ast.File, error) { |
| files := make([]*ast.File, len(filenames)) |
| errors := make([]error, len(filenames)) |
| |
| var wg sync.WaitGroup |
| for i, filename := range filenames { |
| wg.Add(1) |
| go func(i int, filepath string) { |
| defer wg.Done() |
| files[i], errors[i] = parse(filepath, nil) |
| }(i, filepath.Join(dir, filename)) |
| if sequential { |
| wg.Wait() |
| } |
| } |
| wg.Wait() |
| |
| // if there are errors, return the first one for deterministic results |
| for _, err := range errors { |
| if err != nil { |
| return nil, err |
| } |
| } |
| |
| return files, nil |
| } |
| |
| func parseDir(dir string) ([]*ast.File, error) { |
| ctxt := build.Default |
| pkginfo, err := ctxt.ImportDir(dir, 0) |
| if _, nogo := err.(*build.NoGoError); err != nil && !nogo { |
| return nil, err |
| } |
| |
| if *xtestFiles { |
| return parseFiles(dir, pkginfo.XTestGoFiles) |
| } |
| |
| filenames := append(pkginfo.GoFiles, pkginfo.CgoFiles...) |
| if *testFiles { |
| filenames = append(filenames, pkginfo.TestGoFiles...) |
| } |
| return parseFiles(dir, filenames) |
| } |
| |
| func getPkgFiles(args []string) ([]*ast.File, error) { |
| if len(args) == 0 { |
| // stdin |
| file, err := parseStdin() |
| if err != nil { |
| return nil, err |
| } |
| return []*ast.File{file}, nil |
| } |
| |
| if len(args) == 1 { |
| // possibly a directory |
| path := args[0] |
| info, err := os.Stat(path) |
| if err != nil { |
| return nil, err |
| } |
| if info.IsDir() { |
| return parseDir(path) |
| } |
| } |
| |
| // list of files |
| return parseFiles("", args) |
| } |
| |
| func checkPkgFiles(files []*ast.File) { |
| type bailout struct{} |
| |
| // if checkPkgFiles is called multiple times, set up conf only once |
| conf := types.Config{ |
| FakeImportC: true, |
| Error: func(err error) { |
| if !*allErrors && errorCount >= 10 { |
| panic(bailout{}) |
| } |
| report(err) |
| }, |
| Importer: importer.ForCompiler(fset, *compiler, nil), |
| Sizes: SizesFor(build.Default.Compiler, build.Default.GOARCH), |
| } |
| |
| defer func() { |
| switch p := recover().(type) { |
| case nil, bailout: |
| // normal return or early exit |
| default: |
| // re-panic |
| panic(p) |
| } |
| }() |
| |
| const path = "pkg" // any non-empty string will do for now |
| conf.Check(path, fset, files, nil) |
| } |
| |
| func printStats(d time.Duration) { |
| fileCount := 0 |
| lineCount := 0 |
| fset.Iterate(func(f *token.File) bool { |
| fileCount++ |
| lineCount += f.LineCount() |
| return true |
| }) |
| |
| fmt.Printf( |
| "%s (%d files, %d lines, %d lines/s)\n", |
| d, fileCount, lineCount, int64(float64(lineCount)/d.Seconds()), |
| ) |
| } |
| |
| func main() { |
| flag.Usage = usage |
| flag.Parse() |
| initParserMode() |
| |
| start := time.Now() |
| |
| files, err := getPkgFiles(flag.Args()) |
| if err != nil { |
| report(err) |
| os.Exit(2) |
| } |
| |
| checkPkgFiles(files) |
| if errorCount > 0 { |
| os.Exit(2) |
| } |
| |
| if *verbose { |
| printStats(time.Since(start)) |
| } |
| } |