start ast + fix type names in tokenizer

ast.c

@@ -0,0 +1,38 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "ast.h"
+
+int ast_parse(const char* source, uint32_t len, ast *result) {
+    uint32_t estimated_token_count = len / 8;
+
+    tokenizer_tag* tokens_tag = calloc(estimated_token_count, sizeof(tokenizer_tag));
+    if (tokens_tag == NULL) {
+        perror("calloc");
+        return 1;
+    }
+    ast_index* tokens_start = calloc(estimated_token_count, sizeof(ast_index));
+    if (tokens_start == NULL) {
+        free(tokens_tag);
+        perror("calloc");
+        return 1;
+    }
+
+    tokenizer tokenizer = tokenizer_init(source, len);
+    for (uint32_t i = 0; i <= estimated_token_count; i++) {
+        if (i == estimated_token_count) {
+            fprintf(stderr, "too many tokens, bump estimated_token_count\n");
+            return 1;
+        }
+        tokenizer_token token = tokenizer_next(&tokenizer);
+        tokens_tag[i] = token.tag;
+        tokens_start[i] = token.loc.start;
+    }
+
+    /* TODO parser */
+
+    return 0;
+}