From 8b6edc39beb238d84c5b987c4e3c98a36298eb20 Mon Sep 17 00:00:00 2001
From: Garritt McCune <glmccune@gmail.com>
Date: Sat, 8 Oct 2022 16:15:10 -0500
Subject: [PATCH] Updated the Parser to handle the variable declaration
 directive.

---
 src/parser.c | 66 +++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 55 insertions(+), 11 deletions(-)

diff --git a/src/parser.c b/src/parser.c
index 2c7d0d4..a418c7a 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -7,6 +7,7 @@ int CurrentToken = 0;
 void PrintSymbols(void);
 Instruction* HandleOperation(void);
 void HandleAssemblerDirective(void);
+void HandleAssemblerDirective(void);
 void AdvanceParser(void);
 void IgnoreParserLine(void);
 Token* PeekToken(void);
@@ -26,7 +27,7 @@ IRState* ParseTokens(List* tokens) {
 
         switch(t->Class) {
             case DirectiveClass: //Maybe these should be ignored, let another process handle that.
-                IgnoreParserLine();
+                HandleAssemblerDirective();
                 break;
             case MnemonicClass:
                 HandleOperation();
@@ -54,12 +55,6 @@ IRState* ParseTokens(List* tokens) {
                         exit(1);
                     }
 
-                    char mn[12];
-
-                    GetMnemonicText(ins->Mnemonic, mn);
-
-                    printf("Found: %s\n", mn);
-
                     symbol->Value.Instruction = ins;
                 }
                 break;
@@ -76,6 +71,44 @@ IRState* ParseTokens(List* tokens) {
     return &MachineState;
 }
 
+void HandleAssemblerDirective() {
+    Token* token = PeekToken();
+    char* symbolname;
+
+    //ignore sanity checks
+    AdvanceParser();
+
+    token = PeekToken();
+
+    if (token->Class != IdentifierClass) {
+        fprintf(stderr, "[Error] Line %d: expected variable name.", token->LineNumber);
+        IgnoreParserLine();
+        return;
+    }
+
+    symbolname = token->Lemexe;
+
+    AdvanceParser();
+
+    token = PeekToken();
+
+    if (token->Class == NumberClass) {
+        //Delcaring a numeric value.
+        Symbol* s = AddSymbolToTable(symbolname, NumericSymbol, MachineState.SymbolsTable);
+
+        s->Value.Number = token->Value.Number;
+    }
+    else if (token->Class == CharacterClass) {
+        Symbol* s = AddSymbolToTable(symbolname, StringSymbol, MachineState.SymbolsTable);
+
+        s->Value.Text = token->Lemexe;
+
+        IgnoreParserLine();
+    }
+    else IgnoreParserLine();
+
+}
+
 Parameter* GetParameterType() {
     Token* token = PeekToken();
     Symbol* symbol = NULL;
@@ -232,11 +265,22 @@ void PrintSymbols(void) {
     for(int i = 0; i < MachineState.SymbolsTable->Size; i++) {
         Symbol* symbol = MachineState.SymbolsTable->Symbols[i];
 
-        printf("[%s] %s", symbol->Type == UnresolvedSymbol ? "Unresolved" : "Resolved", symbol->Name);
+        printf("[%s] ", symbol->Type == UnresolvedSymbol ? "Unresolved" : "Resolved");
 
-        if (symbol->Type == InstructionPointerSymbol) {
-            GetMnemonicText(symbol->Value.Instruction->Mnemonic, mn);
-            printf(" -> %s", mn);
+        switch(symbol->Type) {
+            case InstructionPointerSymbol:
+                GetMnemonicText(symbol->Value.Instruction->Mnemonic, mn);
+                printf("%s -> %s", symbol->Name, mn);
+                break;     
+            case NumericSymbol:
+                printf("[N] %s", symbol->Name);
+                break;
+            case StringSymbol:
+                printf("[S] %s", symbol->Name);
+                break;
+            case UnresolvedSymbol:
+                printf("[U] %s", symbol->Name);
+                break;
         }
 
         printf("\n");