Move regex_t into parse.h and rename to parse_tree_t

lib/include/parse.h

@@ -6,10 +6,53 @@
 #ifndef PARSE_H
 #define PARSE_H
 
-#include "regex.h"
+#include <stdbool.h>
 
 #define PARSE_FAIL (-1)
 
-int parse_expr(const char *input, int rem, regex_t *out);
+typedef struct {
+	bool negated;
+	int count, capacity;
+	char *contents;
+} parse_class_t;
+
+typedef enum {
+	PARSE_QUANTIFIER_NONE,
+	PARSE_QUANTIFIER_STAR,
+	PARSE_QUANTIFIER_PLUS,
+	PARSE_QUANTIFIER_QMARK,
+} parse_quantifier_t;
+
+typedef enum {
+	PARSE_TERM_WILDCARD,
+	PARSE_TERM_CLASS,
+	PARSE_TERM_LITERAL,
+	PARSE_TERM_SUBEXPR,
+	PARSE_TERM_EMPTY,
+} parse_term_type_t;
+
+struct _parse_term;
+typedef struct {
+	int count, capacity;
+	struct _parse_term *contents;
+} parse_sequence_t;
+
+typedef struct {
+	int count, capacity;
+	parse_sequence_t *contents;
+} parse_tree_t;
+
+typedef struct _parse_term {
+	parse_quantifier_t quantifier;
+	parse_term_type_t type;
+	union {
+		parse_class_t class;
+		char literal;
+		parse_tree_t subexpr;
+	};
+} parse_term_t;
+
+int parse_expr(const char *input, int rem, parse_tree_t *out);
+void parse_tree_free(const parse_tree_t *t);
 
 #endif