Add alias to ast

v0/parser.c

@@ -72,6 +72,52 @@ Module* parser_parse(TokenStream* ts) {
 		}
 	}
 
+    // Now t holds the first non-import token. If it's not TOKEN_ALIAS, return.
+    // If it is, process it.
+    while (t.token == TOKEN_ALIAS) {
+        AliasDeclaration* new_aliases = realloc(module->aliases, (module->alias_count + 1) * sizeof(AliasDeclaration));
+        if (!new_aliases) {
+            fprintf(stderr, "Out of memory\n");
+            exit(1);
+        }
+        module->aliases = new_aliases;
+
+        t = tokenstream_next(ts);
+        if (t.token != TOKEN_IDENTIFIER) {
+            log_on_line(&t.location, t.location.column_end, "expected alias name");
+            parser_free(module);
+            return NULL;
+        }
+        AliasDeclaration alias;
+        alias.name = t;
+
+        t = tokenstream_next(ts);
+        if (t.token != TOKEN_ASSIGN) {
+            log_on_line(&t.location, t.location.column_end, "expected '='");
+            parser_free(module);
+            return NULL;
+        }
+
+        t = tokenstream_next(ts);
+        if (t.token != TOKEN_IDENTIFIER || strncmp(t.text.data, "int32", t.text.length) != 0) {
+            log_on_line(&t.location, t.location.column_end, "expected type");
+            parser_free(module);
+            return NULL;
+        }
+        alias.value = (TypeExpression){ .tag = TYPE_EXPRESSION_BUILTIN, .builtin = { .bitSize = 32, .isSigned = true } };
+        
+        module->aliases[module->alias_count] = alias;
+        module->alias_count++;
+
+        t = tokenstream_next(ts);
+        if (t.token != TOKEN_SEMICOLON) {
+            log_on_line(&t.location, t.location.column_end, "expected ';'");
+            parser_free(module);
+            return NULL;
+        }
+        t = tokenstream_next(ts);
+    }
+
 	return module;
 }