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main.go
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main.go
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package main
import (
"bytes"
"errors"
"flag"
"fmt"
"os"
"path/filepath"
"karmem.org/cmd/karmem/kmgen"
"karmem.org/cmd/karmem/kmparser"
)
// errHelpOnly is an error that only prints the help message and returns no error.
var (
errHelpOnly = errors.New("ErrHelpOnly")
)
func main() {
flag.Usage = func() {
fmt.Println("Usage: karmem <command> [<args>]")
fmt.Println("Commands:")
fmt.Println(" build")
fmt.Println(" Builds the schema file.")
fmt.Println(" Use \"build help\" to see the list of available options.")
os.Exit(1)
}
flag.Parse()
var fn func() error
switch flag.Arg(0) {
case "build":
fn = func() error {
b, err := NewBuild()
if err != nil {
return err
}
return b.Execute()
}
}
if fn == nil {
flag.Usage()
os.Exit(1)
}
if err := fn(); err != nil && err != errHelpOnly {
fmt.Fprintf(os.Stderr, "Error: %s\n", err)
os.Exit(1)
}
}
type SchemaFile struct {
input string
}
func (s *SchemaFile) ParseIDL() (*kmparser.Content, error) {
inputFile, err := os.Open(s.input)
if err != nil {
panic(err)
return nil, err
}
defer inputFile.Close()
info, err := inputFile.Stat()
if err != nil {
return nil, err
}
if info.IsDir() {
return nil, fmt.Errorf("input file is a directory: %s", s.input)
}
parsed, err := kmparser.NewReader(s.input, inputFile).Parser()
if err != nil {
return nil, err
}
return parsed, nil
}
type Build struct {
SchemaFile
language []bool
output string
generator []kmgen.Generator
}
func NewBuild() (b *Build, _ error) {
b = new(Build)
flags := flag.NewFlagSet("build", flag.ExitOnError)
b.language = make([]bool, len(kmgen.Generators))
for i, g := range kmgen.Generators {
flags.BoolVar(&b.language[i], g.Language(), false, fmt.Sprintf("Enable geneartion for %s language.", g.Language()))
}
flags.StringVar(&b.output, "o", ".", "Output directory path.")
if err := flags.Parse(flag.Args()[1:]); err != nil {
return nil, err
}
b.input = flags.Arg(0)
if b.input == "help" {
flags.Usage()
return nil, errHelpOnly
}
for i, g := range kmgen.Generators {
if b.language[i] {
b.generator = append(b.generator, g)
}
}
if len(b.generator) == 0 {
return nil, errors.New("missing language. Please, specify one output language (such as --golang)")
}
return b, nil
}
func (b *Build) Execute() error {
parsed, err := b.ParseIDL()
if err != nil {
return err
}
for _, gen := range b.generator {
compiler, err := gen.Start(parsed)
if err != nil {
return err
}
if b.output != "." {
if err := os.MkdirAll(b.output, os.ModePerm); err != nil {
return err
}
}
for i, c := range compiler.Template {
var buffer bytes.Buffer
for _, n := range compiler.Modules {
if err := c.ExecuteTemplate(&buffer, n, kmgen.TemplateData{Content: parsed}); err != nil {
return err
}
}
outputFile, err := os.Create(filepath.Join(b.output, parsed.Module+"_generated"+gen.Extensions()[i]))
if err != nil {
return err
}
if err := gen.Finish(outputFile, &buffer); err != nil {
return err
}
if err := outputFile.Close(); err != nil {
return err
}
}
}
return nil
}