Build a quick draft of how the symbol value should be computed.

includes/symbols_table.h

@@ -13,16 +13,16 @@
 #define SYMBOLSTABLE_DEFAULT_CAPACITY 128
 
 typedef struct __token_node {
-    Token* Token;
+    const Token* Token;
     struct __token_node* Left;
     struct __token_node* Right;
 } TokenNode;
 
 typedef struct _symbol {
-    char* Name;
+    const char* Name;
     int Address;
     int Length;
-    Token* Token;
+    const Token* Token;
     TokenNode* ValueExpression;
 } Symbol;
 
@@ -33,12 +33,12 @@ typedef struct {
 } SymbolTable;
 
 SymbolTable* CreateSymbolTable(void);
-TokenNode* CreateTokenNode(Token* token);
+TokenNode* CreateTokenNode(const Token* token);
-int TryGetSymbol(char* name, SymbolTable* table, Symbol** outSymbol);
+int TryGetSymbol(const char* name, const SymbolTable* table, Symbol** outSymbol);
-Symbol* AddSymbolToTable(char* name, int address, SymbolTable* table);
+Symbol* AddSymbolToTable(const char* name, int address, SymbolTable* table);
 void FreeSymbolTable(SymbolTable* table);
 void FreeSymbol(Symbol* symbol);
-int SymbolResolved(Symbol* symbol);
+int SymbolResolved(const Symbol* symbol);
-int TryGetSymbolValue(const Symbol* symbol, const SymbolTable* table, unsigned short** value);
+int TryGetSymbolValue(const Symbol* symbol, const SymbolTable* table, unsigned short* value);
 
 #endif

includes/token.h

@@ -50,7 +50,7 @@ typedef struct __token {
         Registers Register;
         Mnemonic Mnemonic;
         Directive Directive;
-        int Number;
+        unsigned short Number;
     } Value;
 
     struct __token* Prev;

src/symbols_table.c

@@ -3,7 +3,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int SymbolResolved(Symbol* symbol) {
+int SymbolResolved(const Symbol* symbol) {
     if (!symbol) return 0;
 
     return symbol->Token != NULL;
@@ -42,7 +42,7 @@ SymbolTable* CreateSymbolTable(void){
     return table;
 }
 
-Symbol* CreateSymbol(char* name, int address) {
+Symbol* CreateSymbol(const char* name, int address) {
     Symbol* symbol = calloc(1, sizeof(Symbol));
 
     if (!symbol) {
@@ -58,7 +58,7 @@ Symbol* CreateSymbol(char* name, int address) {
     return symbol;
 }
 
-int TryGetSymbol(char* name, SymbolTable* table, Symbol** outSymbol) {
+int TryGetSymbol(const char* name, const SymbolTable* table, Symbol** outSymbol) {
     *outSymbol = NULL;
 
     if (!name || !table) return 0;
@@ -73,7 +73,7 @@ int TryGetSymbol(char* name, SymbolTable* table, Symbol** outSymbol) {
     return 0;
 }
 
-Symbol* AddSymbolToTable(char* name, int address, SymbolTable* table) {
+Symbol* AddSymbolToTable(const char* name, int address, SymbolTable* table) {
     //if (!name || !value || !table || length == 0) return NULL;
 
     for(int i = 0; i < table->Size; i++) {
@@ -119,24 +119,52 @@ void FreeSymbol(Symbol* symbol) {
     free(symbol);
 }
 
-int TryGetSymbolValue(const Symbol* symbol, const SymbolTable* table, unsigned short** value) {
+int TryGetSymbolValue(const Symbol* symbol, const SymbolTable* table, unsigned short* value) {
     if (!symbol || !symbol->Token || !table) return 0;
     if (symbol->Token->Class == CharacterClass) return 0;
 
-    unsigned short acc = 0;
+    unsigned short left = 0;
-    Token* current = symbol->Token->Next;
+    unsigned short right = 0;
     
-    for(;;) {
+    TokenNode* root = symbol->ValueExpression;
-        if (current->Class == PunctuationClass && current->Value.Punctuation == NewLine) break;
+    Symbol* s = NULL;
-        Token* next = current->Next;
 
+    if (!root || !root->Token) return 0;
 
+    switch (root->Token->Class) {
+        case NumberClass:
+            *value = root->Token->Value.Number;
+
+            return 1;
+            break;
+        case LabelClass:
+        case IdentifierClass:
+            if (!TryGetSymbol(root->Token->Lemexe, table, &s)) return 0;
+
+            if (!TryGetSymbolValue(s, table, value)) return 0;
+
+            return 1;
+            break;
+        case PunctuationClass: //TODO: ()'s need to be handled
+            //check for math operator
+            if (!TryGetSymbol(root->Left->Token->Lemexe, table, &s)) return 0;
+
+            if (!TryGetSymbolValue(s, table, &left)) return 0;
+
+            if (!TryGetSymbol(root->Right->Token->Lemexe, table, &s)) return 0;
+
+            if (!TryGetSymbolValue(s, table, &right)) return 0;
+
+            *value = left + right; //TODO: actually check what op we need to do.
+            break;
+        default:
+            return 0;
     }
 
     return 1;
 }
 
-TokenNode* CreateTokenNode(Token* token){
+TokenNode* CreateTokenNode(const Token* token){
     TokenNode* node = calloc(1, sizeof(TokenNode));
 
     if (!node) {