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main.go
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main.go
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// Copyright ©2019 The go-hep 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 ./gen-data.go -f ../../testdata/streamers.root
//go:generate root-gen-type -p main -t Event,P3 -o ./testdata/streamers.txt ../../testdata/streamers.root
// Command root-gen-type generates a Go type from the StreamerInfo contained
// in a ROOT file.
package main // import "go-hep.org/x/hep/groot/cmd/root-gen-type"
import (
"flag"
"fmt"
"io"
"log"
"os"
"regexp"
"strings"
"go-hep.org/x/hep/groot"
"go-hep.org/x/hep/groot/rdict"
_ "go-hep.org/x/hep/groot/ztypes"
)
func main() {
log.SetPrefix("root-gen-type: ")
log.SetFlags(0)
var (
typeNames = flag.String("t", ".*", "comma-separated list of (regexp) type names")
pkgPath = flag.String("p", "", "package import path")
output = flag.String("o", "", "output file name")
verbose = flag.Bool("v", false, "enable verbose mode")
)
flag.Usage = func() {
fmt.Fprintf(
os.Stderr,
`Usage: root-gen-type [options] input.root
ex:
$> root-gen-type -p mypkg -t MyType -o streamers_gen.go ./input.root
options:
`,
)
flag.PrintDefaults()
}
flag.Parse()
if *typeNames == "" {
flag.Usage()
os.Exit(2)
}
if flag.NArg() != 1 {
flag.Usage()
os.Exit(2)
}
types := strings.Split(*typeNames, ",")
var (
err error
out io.WriteCloser
)
switch *output {
case "":
out = os.Stdout
default:
out, err = os.Create(*output)
if err != nil {
log.Fatal(err)
}
defer out.Close()
}
err = generate(out, *pkgPath, types, flag.Arg(0), *verbose)
if err != nil {
log.Fatal(err)
}
err = out.Close()
if err != nil {
log.Fatal(err)
}
}
func generate(w io.Writer, pkg string, types []string, fname string, verbose bool) error {
f, err := groot.Open(fname)
if err != nil {
return err
}
g, err := rdict.NewGenGoType(pkg, f, verbose)
if err != nil {
return err
}
filters := make([]*regexp.Regexp, len(types))
for i, t := range types {
filters[i] = regexp.MustCompile(t)
}
accept := func(name string) string {
for _, filter := range filters {
if filter.MatchString(name) {
return name
}
}
return ""
}
for _, si := range f.StreamerInfos() {
if t := accept(si.Name()); t != "" {
err := g.Generate(t)
if err != nil {
log.Fatal(err)
}
}
}
buf, err := g.Format()
if err != nil {
return err
}
_, err = w.Write(buf)
if err != nil {
return err
}
return nil
}