+++ /dev/null
-// Copyright 2015 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.
-
-// TODO(gri): This file and the file src/go/format/internal.go are
-// the same (but for this comment and the package name). Do not modify
-// one without the other. Determine if we can factor out functionality
-// in a public API. See also #11844 for context.
-
-package main
-
-import (
- "bytes"
- "go/ast"
- "go/parser"
- "go/printer"
- "go/token"
- "strings"
-)
-
-// parse parses src, which was read from the named file,
-// as a Go source file, declaration, or statement list.
-func parse(fset *token.FileSet, filename string, src []byte, fragmentOk bool) (
- file *ast.File,
- sourceAdj func(src []byte, indent int) []byte,
- indentAdj int,
- err error,
-) {
- // Try as whole source file.
- file, err = parser.ParseFile(fset, filename, src, parserMode)
- // If there's no error, return. If the error is that the source file didn't begin with a
- // package line and source fragments are ok, fall through to
- // try as a source fragment. Stop and return on any other error.
- if err == nil || !fragmentOk || !strings.Contains(err.Error(), "expected 'package'") {
- return
- }
-
- // 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 p;"), src...)
- file, err = parser.ParseFile(fset, filename, psrc, parserMode)
- if err == nil {
- sourceAdj = func(src []byte, indent int) []byte {
- // Remove the package clause.
- // Gofmt has turned the ; into a \n.
- src = src[indent+len("package p\n"):]
- return bytes.TrimSpace(src)
- }
- return
- }
- // 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
- }
-
- // 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. Add an extra '\n' before the '}'
- // to make sure comments are flushed before the '}'.
- fsrc := append(append([]byte("package p; func _() {"), src...), '\n', '\n', '}')
- file, err = parser.ParseFile(fset, filename, fsrc, parserMode)
- if err == nil {
- sourceAdj = func(src []byte, indent int) []byte {
- // Cap adjusted indent to zero.
- if indent < 0 {
- indent = 0
- }
- // Remove the wrapping.
- // Gofmt has turned the ; into a \n\n.
- // There will be two non-blank lines with indent, hence 2*indent.
- src = src[2*indent+len("package p\n\nfunc _() {"):]
- // Remove only the "}\n" suffix: remaining whitespaces will be trimmed anyway
- src = src[:len(src)-len("}\n")]
- return bytes.TrimSpace(src)
- }
- // Gofmt has also indented the function body one level.
- // Adjust that with indentAdj.
- indentAdj = -1
- }
-
- // Succeeded, or out of options.
- return
-}
-
-// format formats the given package file originally obtained from src
-// and adjusts the result based on the original source via sourceAdj
-// and indentAdj.
-func format(
- fset *token.FileSet,
- file *ast.File,
- sourceAdj func(src []byte, indent int) []byte,
- indentAdj int,
- src []byte,
- cfg printer.Config,
-) ([]byte, error) {
- if sourceAdj == nil {
- // Complete source file.
- var buf bytes.Buffer
- err := cfg.Fprint(&buf, fset, file)
- if err != nil {
- return nil, err
- }
- return buf.Bytes(), nil
- }
-
- // Partial source file.
- // Determine and prepend leading space.
- i, j := 0, 0
- for j < len(src) && isSpace(src[j]) {
- if src[j] == '\n' {
- i = j + 1 // byte offset of last line in leading space
- }
- j++
- }
- var res []byte
- res = append(res, src[:i]...)
-
- // Determine and prepend indentation of first code line.
- // Spaces are ignored unless there are no tabs,
- // in which case spaces count as one tab.
- indent := 0
- hasSpace := false
- for _, b := range src[i:j] {
- switch b {
- case ' ':
- hasSpace = true
- case '\t':
- indent++
- }
- }
- if indent == 0 && hasSpace {
- indent = 1
- }
- for i := 0; i < indent; i++ {
- res = append(res, '\t')
- }
-
- // Format the source.
- // Write it without any leading and trailing space.
- cfg.Indent = indent + indentAdj
- var buf bytes.Buffer
- err := cfg.Fprint(&buf, fset, file)
- if err != nil {
- return nil, err
- }
- out := sourceAdj(buf.Bytes(), cfg.Indent)
-
- // If the adjusted output is empty, the source
- // was empty but (possibly) for white space.
- // The result is the incoming source.
- if len(out) == 0 {
- return src, nil
- }
-
- // Otherwise, append output to leading space.
- res = append(res, out...)
-
- // Determine and append trailing space.
- i = len(src)
- for i > 0 && isSpace(src[i-1]) {
- i--
- }
- return append(res, src[i:]...), nil
-}
-
-// isSpace reports whether the byte is a space character.
-// isSpace defines a space as being among the following bytes: ' ', '\t', '\n' and '\r'.
-func isSpace(b byte) bool {
- return b == ' ' || b == '\t' || b == '\n' || b == '\r'
-}
projects / dotfiles / .git / blobdiff