Added grammar checking for DB declarations.

src/main.c

@@ -20,9 +20,6 @@ int main(int argc, char* args[]) {
     if (!ReadAllString(args[1], &source_code, &bytes_read)) return EX_IOERR;
 
     List* list = GenerateTokenList(source_code);
- 
-    ParseTokens(list);
-
     char mnemonic[12];
 
     for(int i = 0; i < list->size; i++) {
@@ -39,7 +36,7 @@ int main(int argc, char* args[]) {
                 continue;
             }
 
-            printf(" %c ", t->Value.Punctuation);
+            printf("[P]%c", t->Value.Punctuation);
             continue;
         }
 
@@ -75,8 +72,11 @@ int main(int argc, char* args[]) {
         }
 
         if (t->Class == CharacterClass) {
-            printf("%s ", t->Lemexe);
+            printf("[C]'%s'", t->Lemexe);
         }
     } 
+    ParseTokens(list);
+
+
     free(source_code);
 }

src/parser.c

@@ -6,7 +6,7 @@ List* TokensList;
 int CurrentToken = 0;
 
 void PrintSymbols(void);
-Instruction* HandleOperation(void);
+void HandleOperation(void);
 void RemoveCurrentToken(void);
 void HandleAssemblerDirective(void);
 void HandleAssemblerDirective(void);
@@ -35,10 +35,9 @@ IRState* ParseTokens(List* tokens) {
         switch(t->Class) {
             case DirectiveClass: //Maybe these should be ignored, let another process handle that.
                 HandleAssemblerDirective();
-                RemoveCurrentToken(); // clear new line
                 break;
             case MnemonicClass:
-                //HandleOperation();
+                HandleOperation();
                 break;
             case LabelClass:
                 {
@@ -51,8 +50,6 @@ IRState* ParseTokens(List* tokens) {
 
                     if (!found) AddSymbolToTable(t->Lemexe, HeapSize, 1, MachineState.SymbolsTable);
                     else tmp->Resolved = 1;
-
-                    AdvanceParser(); //Consume the NewLine
                 }
                 break;
             default:
@@ -89,24 +86,49 @@ void HandleAssemblerDirective() {
                 if (found) {
                     symbol->Address = HeapSize;
                     symbol->Resolved = 1;
+                }
+                else {
+                    symbol = AddSymbolToTable(identifier->Lemexe, HeapSize, 1, MachineState.SymbolsTable);
+                }
+
+                RemoveCurrentToken(); //Remove the Idenifier name token.
+
+                Token* value = PeekToken();
+
+                if (value->Class == CharacterClass) {
+                    symbol->Length = strlen(value->Lemexe);
+
+                    RemoveCurrentToken(); //Remove the string declared by this DB command.
+
+                    if (PeekToken()->Class == PunctuationClass && PeekToken()->Value.Punctuation == Comma) {
+                        if (PeekToken()->Value.Punctuation != Comma) {
+                            fprintf(stderr, "Syntax error line %d: Expected COMMA got %c.", PeekToken()->LineNumber, PeekToken()->Value.Punctuation);
+                            exit(1);
+                        }
+                        RemoveCurrentToken(); //Remove COMMA
+
+                        if (PeekToken()->Class != NumberClass) {
+                            fprintf(stderr, "Syntax error line %d: Expected terminating byte.\n", PeekToken()->LineNumber);
+                            exit(1);
+                        }
+
+                        RemoveCurrentToken(); //Remove terminating byte
+
+                        symbol->Length++;
+                    }
+                    else if (PeekToken()->Class != PunctuationClass || PeekToken()->Value.Punctuation != NewLine) {
+                        fprintf(stderr, "Syntax error line %d: Expected COMMA got %c.", PeekToken()->LineNumber, PeekToken()->Value.Punctuation);
+                        exit(1);
+                    }
+                }
+                else if (PeekToken()->Class == NumberClass) {
+                    symbol->Length = 2;
+
+                    RemoveCurrentToken(); //Clear the number token.
+                }
 
                 HeapSize += symbol->Length;
             }
-                else {
-                    AddSymbolToTable(identifier->Lemexe, HeapSize, 1, MachineState.SymbolsTable);
-
-                    RemoveCurrentToken();
-
-                    identifier = PeekToken();
-
-                    if (identifier->Class == CharacterClass) {
-                        HeapSize += strlen(identifier->Lemexe);
-                    }
-                    else {
-                        HeapSize += 2;
-                    }
-                }
-            }
             break;
         default:
             fprintf(stderr, "Synatx error on line %d.\n", directive->LineNumber);
@@ -114,7 +136,9 @@ void HandleAssemblerDirective() {
     }
 }
 
+void HandleOperation(void) {
 
+}
 
 void PrintSymbols(void) {
     //char mn[12];
@@ -122,7 +146,7 @@ void PrintSymbols(void) {
     for(int i = 0; i < MachineState.SymbolsTable->Size; i++) {
         Symbol* symbol = MachineState.SymbolsTable->Symbols[i];
 
-        printf("[%s] %s [%d]", symbol->Resolved == 0 ? "Unresolved" : "Resolved", symbol->Name, symbol->Address);
+        printf("[%s] %s [%d] [Width: %d]", symbol->Resolved == 0 ? "Unresolved" : "Resolved", symbol->Name, symbol->Address, symbol->Length);
 
         // switch(symbol->Type) {
         //     case InstructionPointerSymbol: