codegen: add Interpreter struct

This makes the code easier to use.

3 files changed, 40 insertions, 2 deletions

diff --git a/codegen/codegen.go b/codegen/compiler.go
index d7702cd..e0e97ab 100644
--- a/codegen/codegen.go
+++ b/codegen/compiler.go
@@ -21,7 +21,7 @@ type Compiler struct {
 	symbols map[string]symbol
 }
 
-func New() *Compiler { return &Compiler{symbols: map[string]symbol{}, Entry: -1} }
+func NewCompiler() *Compiler { return &Compiler{symbols: map[string]symbol{}, Entry: -1} }
 
 type nodedata struct {
 	ipstart, ipend, symind, fsp int // CFG and symbol node annotations
diff --git a/codegen/codegen_test.go b/codegen/compiler_test.go
index 7262ddc..5989210 100644
--- a/codegen/codegen_test.go
+++ b/codegen/compiler_test.go
@@ -15,7 +15,7 @@ func TestCodeGen(t *testing.T) {
 	for _, test := range tests {
 		test := test
 		t.Run("", func(t *testing.T) {
-			c := New()
+			c := NewCompiler()
 			c.AddSym(fmt.Println, "println", false)
 			n := &parser.Node{}
 			var err error
diff --git a/codegen/interpreter.go b/codegen/interpreter.go
new file mode 100644
index 0000000..8527631
--- /dev/null
+++ b/codegen/interpreter.go
@@ -0,0 +1,38 @@
+package codegen
+
+import (
+	"os"
+
+	"github.com/gnolang/parscan/parser"
+	"github.com/gnolang/parscan/vm1"
+)
+
+const debug = true
+
+type Interpreter struct {
+	*parser.Parser
+	*Compiler
+	*vm1.Machine
+}
+
+func NewInterpreter(p *parser.Parser) *Interpreter {
+	return &Interpreter{p, NewCompiler(), &vm1.Machine{}}
+}
+
+func (i *Interpreter) Eval(src string) (err error) {
+	n := &parser.Node{}
+	if n.Child, err = i.Parse(src); err != nil {
+		return err
+	}
+	if debug {
+		n.Dot(os.Getenv("DOT"), "")
+	}
+	if err = i.CodeGen(n); err != nil {
+		return err
+	}
+	i.Emit(n, vm1.Exit)
+	i.Push(i.Data...)
+	i.PushCode(i.Code)
+	i.SetIP(i.Entry)
+	return i.Run()
+}