From 3d4ab57f05c55cf14f290ec71e27db8900319880 Mon Sep 17 00:00:00 2001
From: Garritt McCune <glmccune@gmail.com>
Date: Mon, 7 Feb 2022 15:33:58 +0000
Subject: [PATCH] Created the skeleton for the parser.

---
 includes/parser.h | 13 +++++++++++
 misc/test.asm     |  2 --
 src/main.c        |  5 +++++
 src/opcodes.c     |  2 +-
 src/parser.c      | 55 +++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 74 insertions(+), 3 deletions(-)
 create mode 100644 includes/parser.h
 create mode 100644 src/parser.c

diff --git a/includes/parser.h b/includes/parser.h
new file mode 100644
index 0000000..c059a4e
--- /dev/null
+++ b/includes/parser.h
@@ -0,0 +1,13 @@
+#ifndef PARSER_H
+#define PARSER_H
+
+#include "list.h"
+
+typedef struct {
+    char* name;
+    int address;
+} Symbol;
+
+void ParseTokens(List*);
+
+#endif
\ No newline at end of file
diff --git a/misc/test.asm b/misc/test.asm
index 1b71088..0e0c739 100644
--- a/misc/test.asm
+++ b/misc/test.asm
@@ -1,5 +1,3 @@
-; comments are ignored
-; This is a very simple test file for an assemblier.
 .org 0x100
 .db msg "Hello, world!", 0
 
diff --git a/src/main.c b/src/main.c
index ee70969..f688bb2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -3,6 +3,7 @@
 #include <string.h>
 #include "../includes/list.h"
 #include "../includes/lexer.h"
+#include "../includes/parser.h"
 
 typedef struct {
     char *opcode;
@@ -38,6 +39,10 @@ int main(int argc, char* args[]) {
     while((bytes_read = getline(&line, &len, file)) != -1) {
         List* tokens = GetTokensFromLine(line);
 
+        if (line_number == 1 || line_number == 2) {
+            ParseTokens(tokens);
+        }
+
         for (int i = 0; i < tokens->size; i++) {
             Token* t = (Token*) tokens->content[i];
 
diff --git a/src/opcodes.c b/src/opcodes.c
index b00c771..1f6d673 100644
--- a/src/opcodes.c
+++ b/src/opcodes.c
@@ -6,7 +6,7 @@ char *opcodes[OPCODECOUNT] = {
     "sub",
     "jz",
     "int",
-    "hlt",
+    "yld",
     "ret"
 };
 
diff --git a/src/parser.c b/src/parser.c
new file mode 100644
index 0000000..51411ad
--- /dev/null
+++ b/src/parser.c
@@ -0,0 +1,55 @@
+#include "../includes/parser.h"
+#include "../includes/lexer.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+static List* SymbolsTable;
+static unsigned int program_counter = 0;
+void ProcessDirective(List*);
+void ProcessVariableDeclaration(List*);
+
+void ParseTokens(List* tokens) {
+    for(int i = 0; i < tokens->size; i++) {
+        if (((Token *) tokens->content[i])->type == TK_Directive){
+            ProcessDirective(tokens);
+        }
+    }
+}
+
+void ProcessDirective(List* tokens) {
+    if (tokens->size < 2) {
+        printf("Directives failed\n");
+        return;
+    }
+
+    Token* directive = (Token *) tokens->content[0];
+
+    if (strcmp(".org", directive->value) == 0) {
+        Token* address_start = (Token*) tokens->content[1];
+        if (address_start->type == TK_Number) {
+            long address = strtol(address_start->value, NULL, 10);
+            printf("Address starting at '%ld'\n", address);
+        }
+        else if (address_start->type == TK_Hex) {
+            long address = strtol(address_start->value, NULL, 16);
+            printf("Setting address to '%ld'\n", address);
+        }
+    }
+
+    if (strcmp(".db", directive->value) == 0) {
+        ProcessVariableDeclaration(tokens);
+    }
+}
+
+void ProcessVariableDeclaration(List* tokens) {
+    if (tokens->size < 3) {
+        printf("Invalid variable delcaration\n");
+        return;
+    }
+    
+    Token* symbol_token = (Token*) tokens->content[1];
+    Token* string_literal = (Token*) tokens->content[2];
+
+    printf("Found string literal.\n");
+    printf("Name '%s' value: '%s'\n", symbol_token->value, string_literal->value);
+}
\ No newline at end of file