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// 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.
// +build ignore
// This is a program that works like the GNU c++filt program.
// It's here for testing purposes and as an example.
package main
import (
"bufio"
"flag"
"fmt"
"io"
"os"
"strings"
"unicode"
"github.com/ianlancetaylor/demangle"
)
func flagUsage() {
usage(os.Stderr, 2)
}
func usage(w io.Writer, status int) {
fmt.Fprintf(w, "Usage: %s [options] [mangled names]\n", os.Args[0])
flag.CommandLine.SetOutput(w)
flag.PrintDefaults()
fmt.Fprintln(w, `Demangled names are displayed to stdout
If a name cannot be demangled it is just echoed to stdout.
If no names are provided on the command line, stdin is read.`)
os.Exit(status)
}
var stripUnderscore = flag.Bool("_", false, "Ignore first leading underscore")
var noParams = flag.Bool("p", false, "Do not display function argument types")
var noVerbose = flag.Bool("i", false, "Do not show implementation details (if any)")
var help = flag.Bool("h", false, "Display help information")
var debug = flag.Bool("d", false, "Display debugging information for strings on command line")
// Unimplemented c++filt flags:
// -n (opposite of -_)
// -t (demangle types)
// -s (set demangling style)
// -V (print version information)
// Characters considered to be part of a symbol.
const symbolChars = "_$."
func main() {
flag.Usage = func() { usage(os.Stderr, 1) }
flag.Parse()
if *help {
usage(os.Stdout, 0)
}
out := bufio.NewWriter(os.Stdout)
if flag.NArg() > 0 {
for _, f := range flag.Args() {
if *debug {
a, err := demangle.ToAST(f, options()...)
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", f, err)
} else {
fmt.Fprintf(out, "%#v\n", a)
}
} else {
doDemangle(out, f)
}
out.WriteByte('\n')
}
if err := out.Flush(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
return
}
scanner := bufio.NewScanner(bufio.NewReader(os.Stdin))
for scanner.Scan() {
line := scanner.Text()
start := -1
for i, c := range line {
if unicode.IsLetter(c) || unicode.IsNumber(c) || strings.ContainsRune(symbolChars, c) {
if start < 0 {
start = i
}
} else {
if start >= 0 {
doDemangle(out, line[start:i])
}
out.WriteRune(c)
start = -1
}
}
if start >= 0 {
doDemangle(out, line[start:])
start = -1
}
out.WriteByte('\n')
if err := out.Flush(); err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(2)
}
}
}
// Demangle a string just as the GNU c++filt program does.
func doDemangle(out *bufio.Writer, name string) {
skip := 0
if name[0] == '.' || name[0] == '$' {
skip++
}
if *stripUnderscore && name[skip] == '_' {
skip++
}
result := demangle.Filter(name[skip:], options()...)
if result == name[skip:] {
out.WriteString(name)
} else {
if name[0] == '.' {
out.WriteByte('.')
}
out.WriteString(result)
}
}
// options returns the demangling options to use based on the command
// line flags.
func options() []demangle.Option {
var options []demangle.Option
if *noParams {
options = append(options, demangle.NoParams)
}
if !*noVerbose {
options = append(options, demangle.Verbose)
}
return options
}
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