Add lang binary and decompiler to VM

1 files changed, 23 insertions, 3 deletions

diff --git a/cmd/vm/main.go b/cmd/vm/main.go
index 19ba160..013899a 100644
--- a/cmd/vm/main.go
+++ b/cmd/vm/main.go
@@ -13,6 +13,7 @@ import (
 func main() {
 	// Take the first argument as the path to the file to be parsed.
 	compile := flag.String("c", "", "compile to file (if not bytecode)")
+	decompile := flag.String("d", "", "decompile bytecode to file")
 	run := flag.Bool("r", false, "run")
 	bytecode := flag.Bool("b", false, "interpret bytecode, without this flag the program will be interpreted in Lang VM text format.")
 
@@ -22,12 +23,16 @@ func main() {
 		exit("-c and -b are mutually exclusive")
 	}
 
+	if *compile != "" && *decompile != "" {
+		exit("-c and -d are mutually exclusive")
+	}
+
 	if *bytecode && !*run {
 		exit("-b requires -r")
 	}
 
-	if *compile == "" && !*run {
-		exit("nothing to do, either -c or -r is required")
+	if *compile == "" && *decompile == "" && !*run {
+		exit("nothing to do, either -c, -d or -r is required")
 	}
 
 	path := flag.Arg(0)
@@ -42,7 +47,7 @@ func main() {
 	defer file.Close()
 
 	var bc code.Code
-	if !*bytecode {
+	if !*bytecode && *decompile == "" {
 		comp := text.NewCompiler(file)
 		bc, err = comp.Compile()
 		if err != nil {
@@ -67,6 +72,21 @@ func main() {
 		}
 
 		bc = code.New(content, code.NewDebugInfo(path))
+
+		if *decompile != "" {
+			decomp := text.NewDecompiler(bc)
+			result := decomp.Decompile()
+
+			output, err := os.Create(*decompile)
+			if err != nil {
+				exit("could not create file: %v", err)
+			}
+			defer output.Close()
+
+			if _, err := output.Write([]byte(result)); err != nil {
+				exit("could not write to file: %v", err)
+			}
+		}
 	}
 
 	if *run {