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package main
import (
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"github.com/nihei9/maleeni/compiler"
"github.com/nihei9/maleeni/spec"
"github.com/spf13/cobra"
)
var compileFlags = struct {
debug *bool
lexSpec *string
compLv *int
output *string
}{}
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,
}
compileFlags.lexSpec = cmd.Flags().StringP("lex-spec", "l", "", "lexical specification file path (default stdin)")
compileFlags.compLv = cmd.Flags().Int("compression-level", compiler.CompressionLevelMax, "compression level")
compileFlags.output = cmd.Flags().StringP("output", "o", "", "output file path (default stdout)")
rootCmd.AddCommand(cmd)
}
func runCompile(cmd *cobra.Command, args []string) (retErr error) {
lspec, err := readLexSpec(*compileFlags.lexSpec)
if err != nil {
return fmt.Errorf("Cannot read a lexical specification: %w", err)
}
clspec, err, cerrs := compiler.Compile(lspec, compiler.CompressionLevel(*compileFlags.compLv))
if err != nil {
if len(cerrs) > 0 {
var b strings.Builder
writeCompileError(&b, cerrs[0])
for _, cerr := range cerrs[1:] {
fmt.Fprintf(&b, "\n")
writeCompileError(&b, cerr)
}
return fmt.Errorf(b.String())
}
return err
}
err = writeCompiledLexSpec(clspec, *compileFlags.output)
if err != nil {
return fmt.Errorf("Cannot write a compiled lexical specification: %w", err)
}
return nil
}
func writeCompileError(w io.Writer, cerr *compiler.CompileError) {
if cerr.Fragment {
fmt.Fprintf(w, "fragment ")
}
fmt.Fprintf(w, "%v: %v", cerr.Kind, cerr.Cause)
if cerr.Detail != "" {
fmt.Fprintf(w, ": %v", cerr.Detail)
}
}
func readLexSpec(path string) (*spec.LexSpec, error) {
r := os.Stdin
if path != "" {
f, err := os.Open(path)
if err != nil {
return nil, fmt.Errorf("Cannot open the lexical specification file %s: %w", path, err)
}
defer f.Close()
r = f
}
data, err := ioutil.ReadAll(r)
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, path string) error {
out, err := json.Marshal(clspec)
if err != nil {
return err
}
w := os.Stdout
if path != "" {
f, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return fmt.Errorf("Cannot open the output file %s: %w", path, err)
}
defer f.Close()
w = f
}
fmt.Fprintf(w, "%v\n", string(out))
return nil
}
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