From e3bc1251e8cb20b30d0c5a27cd1da8f147a82de7 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Thu, 23 Sep 2021 00:24:53 +0200
Subject: Began coding the interpreter (only manages the minimal example for
 now!)

---
 pkg/interpreter/interpreter.go | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 pkg/interpreter/interpreter.go

(limited to 'pkg/interpreter/interpreter.go')

diff --git a/pkg/interpreter/interpreter.go b/pkg/interpreter/interpreter.go
new file mode 100644
index 0000000..ce2499d
--- /dev/null
+++ b/pkg/interpreter/interpreter.go
@@ -0,0 +1,40 @@
+package interpreter
+
+import (
+	"log"
+
+	"git.adyxax.org/adyxax/gofunge/pkg/field"
+	"git.adyxax.org/adyxax/gofunge/pkg/pointer"
+)
+
+type Interpreter struct {
+	f *field.Field
+	p *pointer.Pointer
+}
+
+func NewInterpreter(f *field.Field, p *pointer.Pointer) *Interpreter {
+	return &Interpreter{f: f, p: p}
+}
+
+func (i *Interpreter) Run() {
+	for i.p != nil {
+		i.Step()
+	}
+}
+
+func (i *Interpreter) Step() {
+	var prev *pointer.Pointer = nil
+	for p := i.p; p != nil; p = p.Next {
+		switch p.Get(*i.f) {
+		case '@':
+			if prev == nil {
+				i.p = p.Next
+			} else {
+				prev.Next = p.Next
+			}
+			break
+		default:
+			log.Fatalf("Non implemented instruction code %d : %c", p.Get(*i.f), p.Get(*i.f))
+		}
+	}
+}
-- 
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