diff options
Diffstat (limited to 'vendor/golang.org/x/tools/imports/imports.go')
-rw-r--r-- | vendor/golang.org/x/tools/imports/imports.go | 289 |
1 files changed, 0 insertions, 289 deletions
diff --git a/vendor/golang.org/x/tools/imports/imports.go b/vendor/golang.org/x/tools/imports/imports.go deleted file mode 100644 index 67573f497..000000000 --- a/vendor/golang.org/x/tools/imports/imports.go +++ /dev/null @@ -1,289 +0,0 @@ -// Copyright 2013 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. - -//go:generate go run mkstdlib.go - -// Package imports implements a Go pretty-printer (like package "go/format") -// that also adds or removes import statements as necessary. -package imports // import "golang.org/x/tools/imports" - -import ( - "bufio" - "bytes" - "fmt" - "go/ast" - "go/format" - "go/parser" - "go/printer" - "go/token" - "io" - "regexp" - "strconv" - "strings" - - "golang.org/x/tools/go/ast/astutil" -) - -// Options specifies options for processing files. -type Options struct { - Fragment bool // Accept fragment of a source file (no package statement) - AllErrors bool // Report all errors (not just the first 10 on different lines) - - Comments bool // Print comments (true if nil *Options provided) - TabIndent bool // Use tabs for indent (true if nil *Options provided) - TabWidth int // Tab width (8 if nil *Options provided) - - FormatOnly bool // Disable the insertion and deletion of imports -} - -// Process formats and adjusts imports for the provided file. -// If opt is nil the defaults are used. -// -// Note that filename's directory influences which imports can be chosen, -// so it is important that filename be accurate. -// To process data ``as if'' it were in filename, pass the data as a non-nil src. -func Process(filename string, src []byte, opt *Options) ([]byte, error) { - if opt == nil { - opt = &Options{Comments: true, TabIndent: true, TabWidth: 8} - } - - fileSet := token.NewFileSet() - file, adjust, err := parse(fileSet, filename, src, opt) - if err != nil { - return nil, err - } - - if !opt.FormatOnly { - _, err = fixImports(fileSet, file, filename) - if err != nil { - return nil, err - } - } - - sortImports(fileSet, file) - imps := astutil.Imports(fileSet, file) - - var spacesBefore []string // import paths we need spaces before - for _, impSection := range imps { - // Within each block of contiguous imports, see if any - // import lines are in different group numbers. If so, - // we'll need to put a space between them so it's - // compatible with gofmt. - lastGroup := -1 - for _, importSpec := range impSection { - importPath, _ := strconv.Unquote(importSpec.Path.Value) - groupNum := importGroup(importPath) - if groupNum != lastGroup && lastGroup != -1 { - spacesBefore = append(spacesBefore, importPath) - } - lastGroup = groupNum - } - - } - - printerMode := printer.UseSpaces - if opt.TabIndent { - printerMode |= printer.TabIndent - } - printConfig := &printer.Config{Mode: printerMode, Tabwidth: opt.TabWidth} - - var buf bytes.Buffer - err = printConfig.Fprint(&buf, fileSet, file) - if err != nil { - return nil, err - } - out := buf.Bytes() - if adjust != nil { - out = adjust(src, out) - } - if len(spacesBefore) > 0 { - out = addImportSpaces(bytes.NewReader(out), spacesBefore) - } - - out, err = format.Source(out) - if err != nil { - return nil, err - } - return out, nil -} - -// parse parses src, which was read from filename, -// as a Go source file or statement list. -func parse(fset *token.FileSet, filename string, src []byte, opt *Options) (*ast.File, func(orig, src []byte) []byte, error) { - parserMode := parser.Mode(0) - if opt.Comments { - parserMode |= parser.ParseComments - } - if opt.AllErrors { - parserMode |= parser.AllErrors - } - - // Try as whole source file. - file, err := parser.ParseFile(fset, filename, src, parserMode) - if err == nil { - return file, nil, nil - } - // If the error is that the source file didn't begin with a - // package line and we accept fragmented input, fall through to - // try as a source fragment. Stop and return on any other error. - if !opt.Fragment || !strings.Contains(err.Error(), "expected 'package'") { - return nil, nil, err - } - - // If this is a declaration list, make it a source file - // by inserting a package clause. - // Insert using a ;, not a newline, so that the line numbers - // in psrc match the ones in src. - psrc := append([]byte("package main;"), src...) - file, err = parser.ParseFile(fset, filename, psrc, parserMode) - if err == nil { - // If a main function exists, we will assume this is a main - // package and leave the file. - if containsMainFunc(file) { - return file, nil, nil - } - - adjust := func(orig, src []byte) []byte { - // Remove the package clause. - // Gofmt has turned the ; into a \n. - src = src[len("package main\n"):] - return matchSpace(orig, src) - } - return file, adjust, nil - } - // If the error is that the source file didn't begin with a - // declaration, fall through to try as a statement list. - // Stop and return on any other error. - if !strings.Contains(err.Error(), "expected declaration") { - return nil, nil, err - } - - // If this is a statement list, make it a source file - // by inserting a package clause and turning the list - // into a function body. This handles expressions too. - // Insert using a ;, not a newline, so that the line numbers - // in fsrc match the ones in src. - fsrc := append(append([]byte("package p; func _() {"), src...), '}') - file, err = parser.ParseFile(fset, filename, fsrc, parserMode) - if err == nil { - adjust := func(orig, src []byte) []byte { - // Remove the wrapping. - // Gofmt has turned the ; into a \n\n. - src = src[len("package p\n\nfunc _() {"):] - src = src[:len(src)-len("}\n")] - // Gofmt has also indented the function body one level. - // Remove that indent. - src = bytes.Replace(src, []byte("\n\t"), []byte("\n"), -1) - return matchSpace(orig, src) - } - return file, adjust, nil - } - - // Failed, and out of options. - return nil, nil, err -} - -// containsMainFunc checks if a file contains a function declaration with the -// function signature 'func main()' -func containsMainFunc(file *ast.File) bool { - for _, decl := range file.Decls { - if f, ok := decl.(*ast.FuncDecl); ok { - if f.Name.Name != "main" { - continue - } - - if len(f.Type.Params.List) != 0 { - continue - } - - if f.Type.Results != nil && len(f.Type.Results.List) != 0 { - continue - } - - return true - } - } - - return false -} - -func cutSpace(b []byte) (before, middle, after []byte) { - i := 0 - for i < len(b) && (b[i] == ' ' || b[i] == '\t' || b[i] == '\n') { - i++ - } - j := len(b) - for j > 0 && (b[j-1] == ' ' || b[j-1] == '\t' || b[j-1] == '\n') { - j-- - } - if i <= j { - return b[:i], b[i:j], b[j:] - } - return nil, nil, b[j:] -} - -// matchSpace reformats src to use the same space context as orig. -// 1) If orig begins with blank lines, matchSpace inserts them at the beginning of src. -// 2) matchSpace copies the indentation of the first non-blank line in orig -// to every non-blank line in src. -// 3) matchSpace copies the trailing space from orig and uses it in place -// of src's trailing space. -func matchSpace(orig []byte, src []byte) []byte { - before, _, after := cutSpace(orig) - i := bytes.LastIndex(before, []byte{'\n'}) - before, indent := before[:i+1], before[i+1:] - - _, src, _ = cutSpace(src) - - var b bytes.Buffer - b.Write(before) - for len(src) > 0 { - line := src - if i := bytes.IndexByte(line, '\n'); i >= 0 { - line, src = line[:i+1], line[i+1:] - } else { - src = nil - } - if len(line) > 0 && line[0] != '\n' { // not blank - b.Write(indent) - } - b.Write(line) - } - b.Write(after) - return b.Bytes() -} - -var impLine = regexp.MustCompile(`^\s+(?:[\w\.]+\s+)?"(.+)"`) - -func addImportSpaces(r io.Reader, breaks []string) []byte { - var out bytes.Buffer - sc := bufio.NewScanner(r) - inImports := false - done := false - for sc.Scan() { - s := sc.Text() - - if !inImports && !done && strings.HasPrefix(s, "import") { - inImports = true - } - if inImports && (strings.HasPrefix(s, "var") || - strings.HasPrefix(s, "func") || - strings.HasPrefix(s, "const") || - strings.HasPrefix(s, "type")) { - done = true - inImports = false - } - if inImports && len(breaks) > 0 { - if m := impLine.FindStringSubmatch(s); m != nil { - if m[1] == breaks[0] { - out.WriteByte('\n') - breaks = breaks[1:] - } - } - } - - fmt.Fprintln(&out, s) - } - return out.Bytes() -} |