From a4f548f3ee1ff2ed9e198527644c76737b3a1464 Mon Sep 17 00:00:00 2001
From: Aryadev Chavali <aryadev@aryadevchavali.com>
Date: Sat, 2 Sep 2023 16:24:55 +0100
Subject: Interpreter COMPLETE!

Really easy implementation considering opcodes are super simple.  I
was right to implement the loop_ref system so at parse time we have
resolved references and don't need to do it at runtime (helps with
compilation I guess as well).
---
 main.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/main.c b/main.c
index dad7e92..0743578 100644
--- a/main.c
+++ b/main.c
@@ -21,6 +21,43 @@ typedef struct
   uint8_t memory[MEMORY_DEFAULT];
 } machine_t;
 
+void interpret(machine_t *cpu, node_t *ast, size_t num)
+{
+  for (size_t i = 0; i < num; ++i)
+  {
+    node_t node = ast[i];
+    switch (node.type)
+    {
+    case NEXT:
+      ++cpu->dp;
+      break;
+    case PREV:
+      --cpu->dp;
+      break;
+    case INC:
+      ++cpu->memory[cpu->dp];
+      break;
+    case DEC:
+      --cpu->memory[cpu->dp];
+      break;
+    case OUT:
+      putchar(cpu->memory[cpu->dp]);
+      break;
+    case READ:
+      cpu->memory[cpu->dp] = getchar();
+      break;
+    case LIN:
+      if (cpu->memory[cpu->dp] == 0)
+        i = node.loop_ref;
+      break;
+    case LOUT:
+      if (cpu->memory[cpu->dp] != 0)
+        i = node.loop_ref;
+      break;
+    }
+  }
+}
+
 int main(int argc, char *argv[])
 {
   if (argc == 1)
@@ -36,6 +73,8 @@ int main(int argc, char *argv[])
   buffer_t *buffer;
   struct PResult res;
 
+  machine_t machine = {0};
+
   for (int i = 1; i < argc; ++i)
   {
     filepath = argv[i];
@@ -61,6 +100,8 @@ int main(int argc, char *argv[])
 
     printf("%s=>%s\n", filepath, str);
 
+    interpret(&machine, res.nodes, res.size);
+
     free(str);
     free(res.nodes);
     free(buffer);
-- 
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