Add CLI

1 files changed, 49 insertions, 0 deletions

diff --git a/cli/cmd/compile.go b/cli/cmd/compile.go
new file mode 100644
index 0000000..23aa120
--- /dev/null
+++ b/cli/cmd/compile.go
@@ -0,0 +1,49 @@
+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
+}