rework: AST now uses an arena for allocation

For now it works but i dont really like that i use ParseResult, i mean
is necessary but i think i will try to make it cleaner so that i can
just directly use like parse and pass tath into evaluate, that would
require to move the main evaluate funciton into evaluate_tree or
something  and evaluate takes the arena, uses evaluate_tree and frees
the arena, will try that the next commit but for now this version works
perfectly.

test/CMakeLists.txt

@@ -3,6 +3,7 @@ find_package(cmocka REQUIRED)
 add_executable(test_nodeArray test_ASTNodeArray.c)
 add_executable(test_lexer test_lexer.c)
 add_executable(test_parser test_parser.c)
+add_executable(test_evaluator test_evaluator.c)
 
 target_link_libraries(test_nodeArray
     calculator_lib
@@ -19,6 +20,12 @@ target_link_libraries(test_parser
     cmocka::cmocka
 )
 
+target_link_libraries(test_evaluator
+    calculator_lib
+    cmocka::cmocka
+)
+
 add_test(NAME nodeArray_tests COMMAND test_nodeArray)
 add_test(NAME lexer_tests COMMAND test_lexer)
 add_test(NAME parser_tests COMMAND test_parser)
+add_test(NAME evaluator_tests COMMAND test_evaluator)

test/test_evaluator.c

@@ -16,7 +16,8 @@ static void test_basic_evaluation(void** state) {
     ASTNodeArray context;
 
     tokenize(expr, &context);
-    AST tree = parse(&context);
+    ParseResult result = parse(&context);
+    AST tree = result.tree;
     uint64_t value = evaluate(tree.head);
 
     assert_int_equal(value, 82);

test/test_parser.c

@@ -1,3 +1,4 @@
+#include "arena.h"
 #include "lexer.h"
 #include "parser.h"
 #include <stdarg.h>
@@ -17,7 +18,8 @@ static void test_parsing_basic_expression(void **state) {
     assert_int_equal(tokenize(expr, &tokens), LEXER_OK);
     assert_int_equal(tokens.len, 7);
 
-    AST tree = parse(&tokens);
+    ParseResult result = parse(&tokens);
+    AST tree = result.tree;
     // Assert head is +
     assert_int_equal(tree.head->type, NODE_BINARY_OP);
     assert_int_equal(tree.head->data.binary.op, OP_ADD);
@@ -68,6 +70,7 @@ static void test_parsing_basic_expression(void **state) {
             tree.head->data.binary.right->data.binary.left->data.binary.left->data.integer, 
             3
             );
+    arena_destroy(result.arena);
 }
 
 int main(void) {