From 6a05583e37cd8db8a35179e6cfac0c97c435a377 Mon Sep 17 00:00:00 2001
From: Charlie Stanton <charlie@shtanton.xyz>
Date: Fri, 1 Oct 2021 20:07:40 +0100
Subject: Changes approach to be more understandable

This is more in line with a definitional parser. A later implementation can be faster
---
 cudl.c | 81 ++++++++++++++++++++++++++++--------------------------------------
 1 file changed, 34 insertions(+), 47 deletions(-)

diff --git a/cudl.c b/cudl.c
index 04b3d9b..94e3f7f 100644
--- a/cudl.c
+++ b/cudl.c
@@ -1,70 +1,57 @@
 #include <stdio.h>
 
-union cudl_val_uni {
-	double num;
-	char *str;
-	size_t offset;
+struct cudl_array_value {
+	struct cudl_value *values;
+	size_t length;
 };
 
-struct cudl_val {
-	uint64_t tag;
-	union cudl_val_uni data;
+struct cudl_map_value {
+	struct cudl_map_field {
+		char *key;
+		struct cudl_value value;
+	} *fields;
+	size_t length;
 };
 
-struct cudl_doc {
-	struct cudl_val *root;
-	size_t length;
-	size_t capacity;
-	char *strings;
+struct cudl_value {
+	union {
+		char *string;
+		double number;
+		int boolean;
+		struct array_value array;
+		struct map_value map;
+	} data;
+	int tag;
 };
 
 #define CUDL_TAG_NULL 0
 #define CUDL_TAG_ARRAY 1
 
-#define CUDL_GET_TAG(tag) ((tag) >> 56)
-
 #define CUDL_OK 0
 #define CUDL_ERR_OUT_OF_MEMORY 1
 #define CUDL_ERR_MISSING_VALUE 2
 
-#define BUFFER_LEN 1024
-
-static FILE file;
-static char buffer[BUFFER_LEN];
+void cudl_debug(struct cudl_value *value) {
+}
 
-void cudl_debug(struct cudl_doc doc) {
+/* Free all children of the value, not the value itself */
+void cudl_deinit_value(struct cudl_value value) {
 	int i;
-	for (i = 0; i < doc.length; i++) {
-		switch (CUDL_GET_TAG(doc.root[i].tag)) {
-			case CUDL_TAG_NULL:
-				fprintf(stderr, "null\n");
-				break;
-			case CUDL_TAG_ARRAY:
-				fprintf(stderr, "array with %d elements, ending after %d blocks\n", CUDL_GET_LENGTH(doc.root[i].tag), doc.root[i].data.offset);
-				break;
-			case default:
-				fprintf(stderr, "Unknown value\n");
-				break;
-		}
+	switch (value.tag) {
+		case CUDL_TAG_ARRAY:
+			for (i = 0; i < value.data.array.length; i++) {
+				cudl_deinit_value(value.data.array.values[i]);
+			}
+			free(value.data.array.values);
+			break;
+		case CUDL_TAG_NULL:
+		case default:
+			break;
 	}
 }
 
-void cudl_deinit_doc(struct cudl_doc doc) {
-	free(doc.cudl_val);
-	free(doc.strings);
+int cudl_parse_from_file(FILE input_file, struct cudl_value *value) {
 }
 
-int cudl_parse_from_file(FILE input_file, struct cudl_doc *doc) {
-	int c;
-
-	/* Init doc */
-	if ((doc->root = malloc(256 * sizeof(struct cudl_val))) == NULL)
-		return CUDL_ERR_OUT_OF_MEMORY;
-	if ((doc->strings = malloc(256)) == NULL) {
-		free(doc->root);
-		return CUDL_ERR_OUT_OF_MEMORY;
-	}
-
-	if ((c = next_char(file)) == EOF)
-		return CUDL_ERR_MISSING_VALUE;
+int cudl_parse(char *input, struct cudl_value *value) {
 }
-- 
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