add declaration with function support

src/parser/literals/literals.c

@@ -0,0 +1,29 @@
+#include "literals.h"
+#include "../parser.h"
+#include <stdbool.h>
+#include "../../memory.h"
+
+static bool true_value = true;
+static bool false_value = false;
+
+ParsedValue * parse_true(){
+    ParsedValue * parsedValue = checked_malloc(sizeof(ParsedValue));
+    parsedValue->type = AST_BOOLEAN;
+    parsedValue->data = &true_value;
+    return parsedValue;
+};
+
+ParsedValue * parse_false(){
+    ParsedValue * parsedValue = checked_malloc(sizeof(ParsedValue));
+    parsedValue->type = AST_BOOLEAN;
+    parsedValue->data = &false_value;
+    return parsedValue;
+};
+
+
+ParsedValue * parse_null(){
+    ParsedValue * parsedValue = checked_malloc(sizeof(ParsedValue));
+    parsedValue->type = AST_NULL;
+    parsedValue->data = NULL;
+    return parsedValue;
+};