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package cmd
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"time"
"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) (retErr error) {
lspec, err := readLexSpec()
if err != nil {
return fmt.Errorf("Cannot read a lexical specification: %w", err)
}
var w io.Writer
{
fileName := "maleeni-compile.log"
f, err := os.OpenFile(fileName, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return fmt.Errorf("Cannot open the log file %s: %w", fileName, err)
}
defer f.Close()
w = f
}
fmt.Fprintf(w, `maleeni compile starts.
Date time: %v
---
`, time.Now().Format(time.RFC3339))
defer func() {
fmt.Fprintf(w, "---\n")
if retErr != nil {
fmt.Fprintf(w, "maleeni compile failed: %v\n", retErr)
} else {
fmt.Fprintf(w, "maleeni compile succeeded.\n")
}
}()
clspec, err := compiler.Compile(lspec, compiler.EnableLogging(w))
if err != nil {
return err
}
err = writeCompiledLexSpec(clspec)
if err != nil {
return fmt.Errorf("Cannot write a compiled lexical specification: %w", err)
}
return nil
}
func readLexSpec() (*spec.LexSpec, error) {
data, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return nil, err
}
lspec := &spec.LexSpec{}
err = json.Unmarshal(data, lspec)
if err != nil {
return nil, err
}
return lspec, nil
}
func writeCompiledLexSpec(clspec *spec.CompiledLexSpec) error {
out, err := json.Marshal(clspec)
if err != nil {
return err
}
fmt.Fprintf(os.Stdout, "%v\n", string(out))
return nil
}
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