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package cmd
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"github.com/nihei9/maleeni/compiler"
"github.com/nihei9/maleeni/spec"
"github.com/spf13/cobra"
)
func init() {
cmd := &cobra.Command{
Use: "compile",
Short: "Compile a lexical specification into a DFA",
Long: `compile takes a lexical specification and generates a DFA accepting the tokens described in the specification.`,
Example: ` cat lexspec.json | maleeni compile > clexspec.json`,
RunE: runCompile,
}
rootCmd.AddCommand(cmd)
}
func runCompile(cmd *cobra.Command, args []string) error {
var lspec *spec.LexSpec
{
data, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return err
}
lspec = &spec.LexSpec{}
err = json.Unmarshal(data, lspec)
if err != nil {
return err
}
}
clspec, err := compiler.Compile(lspec)
if err != nil {
return err
}
out, err := json.Marshal(clspec)
if err != nil {
return err
}
fmt.Fprintf(os.Stdout, "%v\n", string(out))
return nil
}
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