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// Copyright 2009 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.
package main
import (
"astprinter";
"flag";
"fmt";
"format";
"go/ast";
"go/parser";
"go/token";
"io";
"os";
"sort";
"tabwriter";
)
var (
// operation modes
columns bool;
silent = flag.Bool("s", false, "silent mode: no pretty print output");
verbose = flag.Bool("v", false, "verbose mode: trace parsing");
// layout control
tabwidth = flag.Int("tabwidth", 4, "tab width");
usetabs = flag.Bool("tabs", false, "align with tabs instead of blanks");
formatter = flag.Bool("formatter", false, "use formatter"); // TODO remove eventually
)
func init() {
user, err := os.Getenv("USER");
flag.BoolVar(&columns, "columns", user == "gri", "print column no. in error messages");
}
func usage() {
fmt.Fprintf(os.Stderr, "usage: pretty { flags } { files }\n");
flag.PrintDefaults();
os.Exit(1);
}
// TODO(gri) use library function for this once it exists
func readFile(filename string) ([]byte, os.Error) {
f, err := os.Open(filename, os.O_RDONLY, 0);
if err != nil {
return nil, err;
}
defer f.Close();
var b io.ByteBuffer;
if n, err := io.Copy(f, &b); err != nil {
return nil, err;
}
return b.Data(), nil;
}
// TODO(gri) move this function into tabwriter.go? (also used in godoc)
func makeTabwriter(writer io.Writer) *tabwriter.Writer {
padchar := byte(' ');
if *usetabs {
padchar = '\t';
}
return tabwriter.NewWriter(writer, *tabwidth, 1, padchar, 0);
}
func isValidPos(state *format.State, value interface{}, rule_name string) bool {
pos := value.(token.Position);
return pos.IsValid();
}
func isSend(state *format.State, value interface{}, rule_name string) bool {
return value.(ast.ChanDir) & ast.SEND != 0;
}
func isRecv(state *format.State, value interface{}, rule_name string) bool {
return value.(ast.ChanDir) & ast.RECV != 0;
}
func isMultiLineComment(state *format.State, value interface{}, rule_name string) bool {
return value.([]byte)[1] == '*';
}
type environment struct {
optSemi *bool;
}
func (e environment) Copy() format.Environment {
optSemi := *e.optSemi;
return environment{&optSemi};
}
func clearOptSemi(state *format.State, value interface{}, rule_name string) bool {
*state.Env().(environment).optSemi = false;
return true;
}
func setOptSemi(state *format.State, value interface{}, rule_name string) bool {
*state.Env().(environment).optSemi = true;
return true;
}
func optSemi(state *format.State, value interface{}, rule_name string) bool {
if !*state.Env().(environment).optSemi {
state.Write([]byte{';'});
}
return true;
}
var fmap = format.FormatterMap {
"isValidPos": isValidPos,
"isSend": isSend,
"isRecv": isRecv,
"isMultiLineComment": isMultiLineComment,
"/": clearOptSemi,
"clearOptSemi": clearOptSemi,
"setOptSemi": setOptSemi,
"optSemi": optSemi,
}
func main() {
// handle flags
flag.Parse();
if flag.NFlag() == 0 && flag.NArg() == 0 {
usage();
}
// determine parsing mode
mode := parser.ParseComments;
if *verbose {
mode |= parser.Trace;
}
// get ast format
const ast_txt = "ast.txt";
src, err := readFile(ast_txt);
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", ast_txt, err);
os.Exit(1);
}
ast_format, err := format.Parse(src, fmap);
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", ast_txt, err);
os.Exit(1);
}
// process files
exitcode := 0;
for i := 0; i < flag.NArg(); i++ {
filename := flag.Arg(i);
src, err := readFile(filename);
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %v\n", filename, err);
exitcode = 1;
continue; // proceed with next file
}
prog, err := parser.Parse(src, mode);
if err != nil {
if errors, ok := err.(parser.ErrorList); ok {
sort.Sort(errors);
for _, e := range errors {
fmt.Fprintf(os.Stderr, "%s:%v\n", filename, e);
}
} else {
fmt.Fprintf(os.Stderr, "%s: %v\n", filename, err);
}
exitcode = 1;
continue; // proceed with next file
}
if !*silent {
tw := makeTabwriter(os.Stdout);
if *formatter {
env := environment{new(bool)};
_, err := ast_format.Fprint(tw, env, prog);
if err != nil {
fmt.Fprintf(os.Stderr, "format error: %v\n", err);
exitcode = 1;
continue; // proceed with next file
}
} else {
var p astPrinter.Printer;
p.Init(tw, nil, nil /*prog.Comments*/, false);
p.DoProgram(prog);
}
tw.Flush();
}
}
os.Exit(exitcode);
}
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