codegen: add Interpreter struct

This makes the code easier to use.

1 files changed, 58 insertions, 0 deletions

diff --git a/codegen/compiler_test.go b/codegen/compiler_test.go
new file mode 100644
index 0000000..5989210
--- /dev/null
+++ b/codegen/compiler_test.go
@@ -0,0 +1,58 @@
+package codegen
+
+import (
+	"fmt"
+	"log"
+	"testing"
+
+	"github.com/gnolang/parscan/lang/golang"
+	"github.com/gnolang/parscan/parser"
+	"github.com/gnolang/parscan/vm1"
+)
+
+func TestCodeGen(t *testing.T) {
+	log.SetFlags(log.Lshortfile)
+	for _, test := range tests {
+		test := test
+		t.Run("", func(t *testing.T) {
+			c := NewCompiler()
+			c.AddSym(fmt.Println, "println", false)
+			n := &parser.Node{}
+			var err error
+			if n.Child, err = golang.GoParser.Parse(test.src); err != nil {
+				t.Error(err)
+			}
+			errStr := ""
+			if err = c.CodeGen(n); err != nil {
+				errStr = err.Error()
+			}
+			if errStr != test.err {
+				t.Errorf("got error %#v, want error %#v", errStr, test.err)
+			}
+			t.Log("data:", c.Data)
+			t.Log("code:", vm1.Disassemble(c.Code))
+			if s := vm1.Disassemble(c.Code); s != test.asm {
+				t.Errorf("got error %#v, want error %#v", s, test.asm)
+			}
+		})
+	}
+}
+
+var tests = []struct {
+	src, asm, sym, err string
+}{{ // #00
+	src: "1+2",
+	asm: "Push 1\nPush 2\nAdd\n",
+}, { // #01
+	src: `println("Hello")`,
+	asm: "Dup 0\nDup 1\nCallX 1\n",
+}, { // #02
+	src: `a := 2; println(a)`,
+	asm: "Push 2\nAssign 1\nDup 0\nDup 1\nCallX 1\n",
+}, { // #03
+	src: `a := 2; if a < 3 {println(a)}; println("bye")`,
+	asm: "Push 2\nAssign 1\nDup 1\nPush 3\nLower\nJumpFalse 4\nDup 0\nDup 1\nCallX 1\nDup 0\nDup 2\nCallX 1\n",
+}, { // #04
+	src: "func add(a int, b int) int { return a + b }",
+	asm: "Fdup -2\nFdup -3\nAdd\nReturn 1 2\n",
+}, {}}