Move regex_t into parse.h and rename to parse_tree_t

lib/CMakeLists.txt

@@ -5,7 +5,6 @@ add_library(lib
   fsa.c
   min_heap.c
   parse.c
-  regex.c
 )
 set_default_target_options(lib)
 target_include_directories(lib PUBLIC include)

lib/compile.c

@@ -11,13 +11,13 @@
 
 bool compile(const char *regex, int len, fsa_t *dfa_out)
 {
-	regex_t pt;
+	parse_tree_t pt;
 	if (-1 == parse_expr(regex, len, &pt))
 		return false;
 
 	fsa_t nfa;
 	construct_nfa(&pt, &nfa);
-	regex_free(&pt);
+	parse_tree_free(&pt);
 
 	convert_to_dfa(&nfa, dfa_out);
 	fsa_free(&nfa);

lib/construct.c

@@ -128,7 +128,7 @@ static void construct_symbol(fsa_t *out, int symbol)
 	fsa_add_rule(out, out->initial, 0, symbol);
 }
 
-static bool in_class(const regex_class_t *class, char c)
+static bool in_class(const parse_class_t *class, char c)
 {
 	for (int i = 0; i < class->count; ++i) {
 		if (class->contents[i] == c)
@@ -137,7 +137,7 @@ static bool in_class(const regex_class_t *class, char c)
 	return false;
 }
 
-static void construct_class(fsa_t *out, const regex_class_t *class)
+static void construct_class(fsa_t *out, const parse_class_t *class)
 {
 	construct_base(out);
 	if (class->negated) {
@@ -190,36 +190,36 @@ static void construct_qmark(fsa_t *out)
 	fsa_add_rule(out, out->initial, 0, EPSILON);
 }
 
-static void construct_term(const regex_term_t *term, fsa_t *out)
+static void construct_term(const parse_term_t *term, fsa_t *out)
 {
 	switch (term->type) {
-	case REGEX_TERM_EMPTY:
+	case PARSE_TERM_EMPTY:
 		construct_symbol(out, EPSILON);
 		break;
-	case REGEX_TERM_LITERAL:
+	case PARSE_TERM_LITERAL:
 		construct_symbol(out, term->literal);
 		break;
-	case REGEX_TERM_SUBEXPR:
+	case PARSE_TERM_SUBEXPR:
 		construct_nfa(&term->subexpr, out);
 		break;
-	case REGEX_TERM_CLASS:
+	case PARSE_TERM_CLASS:
 		construct_class(out, &term->class);
 		break;
-	case REGEX_TERM_WILDCARD:
+	case PARSE_TERM_WILDCARD:
 		construct_wildcard(out);
 		break;
 	}
 
 	switch (term->quantifier) {
-	case REGEX_QUANTIFIER_NONE:
+	case PARSE_QUANTIFIER_NONE:
 		break;
-	case REGEX_QUANTIFIER_STAR:
+	case PARSE_QUANTIFIER_STAR:
 		construct_star(out);
 		break;
-	case REGEX_QUANTIFIER_PLUS:
+	case PARSE_QUANTIFIER_PLUS:
 		construct_plus(out);
 		break;
-	case REGEX_QUANTIFIER_QMARK:
+	case PARSE_QUANTIFIER_QMARK:
 		construct_qmark(out);
 		break;
 	}
@@ -227,7 +227,7 @@ static void construct_term(const regex_term_t *term, fsa_t *out)
 	assert(out->states[0].final);
 }
 
-static void construct_sequence(const regex_sequence_t *seq, fsa_t *out)
+static void construct_sequence(const parse_sequence_t *seq, fsa_t *out)
 {
 	assert(seq->count > 0);
 
@@ -261,7 +261,7 @@ static void construct_union(fsa_t *f, const fsa_t *o)
 	fsa_add_rule(f, final, 0, EPSILON);
 }
 
-void construct_nfa(const regex_t *regex, fsa_t *out)
+void construct_nfa(const parse_tree_t *regex, fsa_t *out)
 {
 	assert(regex->count > 0);
 

lib/include/construct.h

@@ -7,8 +7,8 @@
 #define CONSTRUCT_H
 
 #include "fsa.h"
-#include "regex.h"
+#include "parse.h"
 
-void construct_nfa(const regex_t *regex, fsa_t *out);
+void construct_nfa(const parse_tree_t *regex, fsa_t *out);
 
 #endif

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

lib/include/regex.h

@@ -1,56 +0,0 @@
-/*
- * Copyright (c) Camden Dixie O'Brien
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-#ifndef REGEX_H
-#define REGEX_H
-
-#include <stdbool.h>
-
-typedef struct {
-	bool negated;
-	int count, capacity;
-	char *contents;
-} regex_class_t;
-
-typedef enum {
-	REGEX_QUANTIFIER_NONE,
-	REGEX_QUANTIFIER_STAR,
-	REGEX_QUANTIFIER_PLUS,
-	REGEX_QUANTIFIER_QMARK,
-} regex_quantifier_t;
-
-typedef enum {
-	REGEX_TERM_WILDCARD,
-	REGEX_TERM_CLASS,
-	REGEX_TERM_LITERAL,
-	REGEX_TERM_SUBEXPR,
-	REGEX_TERM_EMPTY,
-} regex_term_type_t;
-
-struct _regex_term;
-typedef struct {
-	int count, capacity;
-	struct _regex_term *contents;
-} regex_sequence_t;
-
-typedef struct {
-	int count, capacity;
-	regex_sequence_t *contents;
-} regex_t;
-
-typedef struct _regex_term {
-	regex_quantifier_t quantifier;
-	regex_term_type_t type;
-	union {
-		regex_class_t class;
-		char literal;
-		regex_t subexpr;
-	};
-} regex_term_t;
-
-void regex_free(const regex_t *t);
-void regex_class_free(const regex_class_t *c);
-
-#endif

lib/parse.c

@@ -45,7 +45,7 @@ static int parse_literal(const char *input, int rem, char *out)
 	}
 }
 
-static int parse_class(const char *input, int rem, regex_class_t *out)
+static int parse_class(const char *input, int rem, parse_class_t *out)
 {
 	int result, used = 0;
 
@@ -87,7 +87,7 @@ static int parse_class(const char *input, int rem, regex_class_t *out)
 	return out->count > 0 ? used : -1;
 }
 
-static int parse_term(const char *input, int rem, regex_term_t *out)
+static int parse_term(const char *input, int rem, parse_term_t *out)
 {
 	int result, used = 0;
 
@@ -95,7 +95,7 @@ static int parse_term(const char *input, int rem, regex_term_t *out)
 		return PARSE_FAIL;
 
 	if ('.' == input[0]) {
-		out->type = REGEX_TERM_WILDCARD;
+		out->type = PARSE_TERM_WILDCARD;
 		++used;
 	} else if ('(' == input[0]) {
 		++used;
@@ -103,7 +103,7 @@ static int parse_term(const char *input, int rem, regex_term_t *out)
 		result = parse_expr(input + used, rem - used, &out->subexpr);
 		if (PARSE_FAIL == result)
 			return PARSE_FAIL;
-		out->type = REGEX_TERM_SUBEXPR;
+		out->type = PARSE_TERM_SUBEXPR;
 		used += result;
 
 		if (')' != input[used])
@@ -113,54 +113,54 @@ static int parse_term(const char *input, int rem, regex_term_t *out)
 		result = parse_class(input + used, rem - used, &out->class);
 		if (PARSE_FAIL == result)
 			return PARSE_FAIL;
-		out->type = REGEX_TERM_CLASS;
+		out->type = PARSE_TERM_CLASS;
 		used += result;
 	} else {
 		result = parse_literal(input + used, rem - used, &out->literal);
 		if (PARSE_FAIL == result)
 			return PARSE_FAIL;
-		out->type = REGEX_TERM_LITERAL;
+		out->type = PARSE_TERM_LITERAL;
 		used += result;
 	}
 
 	if (used < rem) {
 		switch (input[used]) {
 		case '*':
-			out->quantifier = REGEX_QUANTIFIER_STAR;
+			out->quantifier = PARSE_QUANTIFIER_STAR;
 			++used;
 			break;
 		case '+':
-			out->quantifier = REGEX_QUANTIFIER_PLUS;
+			out->quantifier = PARSE_QUANTIFIER_PLUS;
 			++used;
 			break;
 		case '?':
-			out->quantifier = REGEX_QUANTIFIER_QMARK;
+			out->quantifier = PARSE_QUANTIFIER_QMARK;
 			++used;
 			break;
 		default:
-			out->quantifier = REGEX_QUANTIFIER_NONE;
+			out->quantifier = PARSE_QUANTIFIER_NONE;
 		}
 	} else {
-		out->quantifier = REGEX_QUANTIFIER_NONE;
+		out->quantifier = PARSE_QUANTIFIER_NONE;
 	}
 
 	return used;
 }
 
-static int parse_sequence(const char *input, int rem, regex_sequence_t *out)
+static int parse_sequence(const char *input, int rem, parse_sequence_t *out)
 {
 	int result, used = 0;
 
 	out->count = 0;
 	out->capacity = SEQUENCE_START_CAPACITY;
-	out->contents = malloc(out->capacity * sizeof(regex_term_t));
+	out->contents = malloc(out->capacity * sizeof(parse_term_t));
 	assert(NULL != out->contents);
 
 	while (used < rem) {
 		if (out->count >= out->capacity) {
 			out->capacity *= 2;
 			out->contents = realloc(
-			    out->contents, out->capacity * sizeof(regex_term_t));
+			    out->contents, out->capacity * sizeof(parse_term_t));
 			assert(NULL != out->contents);
 		}
 
@@ -175,13 +175,13 @@ static int parse_sequence(const char *input, int rem, regex_sequence_t *out)
 	return out->count > 0 ? used : -1;
 }
 
-int parse_expr(const char *input, int rem, regex_t *out)
+int parse_expr(const char *input, int rem, parse_tree_t *out)
 {
 	int result, used = 0;
 
 	out->count = 0;
 	out->capacity = TREE_START_CAPACITY;
-	out->contents = malloc(out->capacity * sizeof(regex_sequence_t));
+	out->contents = malloc(out->capacity * sizeof(parse_sequence_t));
 	assert(NULL != out->contents);
 
 	result = parse_sequence(input + used, rem - used, &out->contents[0]);
@@ -198,7 +198,7 @@ int parse_expr(const char *input, int rem, regex_t *out)
 		if (out->count >= out->capacity) {
 			out->capacity *= 2;
 			out->contents = realloc(
-			    out->contents, out->capacity * sizeof(regex_sequence_t));
+			    out->contents, out->capacity * sizeof(parse_sequence_t));
 			assert(NULL != out->contents);
 		}
 
@@ -212,3 +212,37 @@ int parse_expr(const char *input, int rem, regex_t *out)
 
 	return used;
 }
+
+static void class_free(const parse_class_t *c)
+{
+	if (NULL != c->contents)
+		free(c->contents);
+}
+
+static void sequence_free(const parse_sequence_t *s)
+{
+	if (NULL != s->contents) {
+		for (int i = 0; i < s->count; ++i) {
+			switch (s->contents[i].type) {
+			case PARSE_TERM_CLASS:
+				class_free(&s->contents[i].class);
+				break;
+			case PARSE_TERM_SUBEXPR:
+				parse_tree_free(&s->contents[i].subexpr);
+				break;
+			default:
+				break;
+			}
+		}
+		free(s->contents);
+	}
+}
+
+void parse_tree_free(const parse_tree_t *t)
+{
+	if (NULL != t->contents) {
+		for (int i = 0; i < t->count; ++i)
+			sequence_free(&t->contents[i]);
+		free(t->contents);
+	}
+}

lib/regex.c

@@ -1,42 +0,0 @@
-/*
- * Copyright (c) Camden Dixie O'Brien
- * SPDX-License-Identifier: AGPL-3.0-only
- */
-
-#include "regex.h"
-
-#include <stdlib.h>
-
-static void sequence_free(const regex_sequence_t *s)
-{
-	if (NULL != s->contents) {
-		for (int i = 0; i < s->count; ++i) {
-			switch (s->contents[i].type) {
-			case REGEX_TERM_CLASS:
-				regex_class_free(&s->contents[i].class);
-				break;
-			case REGEX_TERM_SUBEXPR:
-				regex_free(&s->contents[i].subexpr);
-				break;
-			default:
-				break;
-			}
-		}
-		free(s->contents);
-	}
-}
-
-void regex_free(const regex_t *t)
-{
-	if (NULL != t->contents) {
-		for (int i = 0; i < t->count; ++i)
-			sequence_free(&t->contents[i]);
-		free(t->contents);
-	}
-}
-
-void regex_class_free(const regex_class_t *c)
-{
-	if (NULL != c->contents)
-		free(c->contents);
-}

tests/construct_tests.c

@@ -34,13 +34,13 @@ static bool accepts(const fsa_t *nfa, const char *input)
 
 static void test_empty_expression(void)
 {
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_EMPTY;
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_EMPTY;
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	const regex_t regex
+	const parse_tree_t regex
 	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
@@ -49,19 +49,19 @@ static void test_empty_expression(void)
 	ASSERT_TRUE(accepts(&fsa, ""));
 	ASSERT_FALSE(accepts(&fsa, "a"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_wildcard(void)
 {
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_WILDCARD;
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_WILDCARD;
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	const regex_t regex
+	const parse_tree_t regex
 	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
@@ -74,20 +74,20 @@ static void test_wildcard(void)
 	ASSERT_FALSE(accepts(&fsa, ""));
 	ASSERT_FALSE(accepts(&fsa, "aa"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_literal_expression(void)
 {
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_LITERAL;
 	terms[0].literal = 'a';
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	const regex_t regex
+	const parse_tree_t regex
 	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
@@ -96,26 +96,27 @@ static void test_literal_expression(void)
 	ASSERT_TRUE(accepts(&fsa, "a"));
 	ASSERT_FALSE(accepts(&fsa, "b"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_sequence(void)
 {
-	regex_term_t *terms = malloc(3 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *terms = malloc(3 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_LITERAL;
 	terms[0].literal = 'a';
-	terms[1].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[1].type = REGEX_TERM_LITERAL;
+	terms[1].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[1].type = PARSE_TERM_LITERAL;
 	terms[1].literal = 'b';
-	terms[2].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[2].type = REGEX_TERM_LITERAL;
+	terms[2].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[2].type = PARSE_TERM_LITERAL;
 	terms[2].literal = 'c';
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 3;
 	alternatives[0].contents = terms;
-	regex_t regex = { .count = 1, .capacity = 1, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -126,24 +127,25 @@ static void test_sequence(void)
 	ASSERT_FALSE(accepts(&fsa, "d"));
 	ASSERT_FALSE(accepts(&fsa, "abcd"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_union(void)
 {
 	const char *literals = "abc";
-	regex_sequence_t *alternatives = malloc(3 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(3 * sizeof(parse_sequence_t));
 	for (int i = 0; i < 3; ++i) {
-		regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-		terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-		terms[0].type = REGEX_TERM_LITERAL;
+		parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+		terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+		terms[0].type = PARSE_TERM_LITERAL;
 		terms[0].literal = literals[i];
 
 		alternatives[i].count = alternatives[i].capacity = 1;
 		alternatives[i].contents = terms;
 	}
-	regex_t regex = { .count = 3, .capacity = 3, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 3, .capacity = 3, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -154,20 +156,21 @@ static void test_union(void)
 	ASSERT_FALSE(accepts(&fsa, "d"));
 	ASSERT_FALSE(accepts(&fsa, "aa"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_star(void)
 {
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_STAR;
-	terms[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_STAR;
+	terms[0].type = PARSE_TERM_LITERAL;
 	terms[0].literal = 'a';
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	regex_t regex = { .count = 1, .capacity = 1, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -177,20 +180,21 @@ static void test_star(void)
 	ASSERT_TRUE(accepts(&fsa, "aaaaaa"));
 	ASSERT_FALSE(accepts(&fsa, "b"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_plus(void)
 {
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_PLUS;
-	terms[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_PLUS;
+	terms[0].type = PARSE_TERM_LITERAL;
 	terms[0].literal = 'a';
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	regex_t regex = { .count = 1, .capacity = 1, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -200,20 +204,21 @@ static void test_plus(void)
 	ASSERT_FALSE(accepts(&fsa, ""));
 	ASSERT_FALSE(accepts(&fsa, "b"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_qmark(void)
 {
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_QMARK;
-	terms[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_QMARK;
+	terms[0].type = PARSE_TERM_LITERAL;
 	terms[0].literal = 'a';
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	regex_t regex = { .count = 1, .capacity = 1, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -223,29 +228,30 @@ static void test_qmark(void)
 	ASSERT_FALSE(accepts(&fsa, "aa"));
 	ASSERT_FALSE(accepts(&fsa, "b"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_subexpression(void)
 {
-	regex_term_t *inner_terms = malloc(1 * sizeof(regex_term_t));
-	inner_terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	inner_terms[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *inner_terms = malloc(1 * sizeof(parse_term_t));
+	inner_terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	inner_terms[0].type = PARSE_TERM_LITERAL;
 	inner_terms[0].literal = 'a';
-	regex_sequence_t *inner_alternatives
-	    = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *inner_alternatives
+	    = malloc(1 * sizeof(parse_sequence_t));
 	inner_alternatives[0].count = inner_alternatives[0].capacity = 1;
 	inner_alternatives[0].contents = inner_terms;
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_SUBEXPR;
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_SUBEXPR;
 	terms[0].subexpr.count = terms[0].subexpr.capacity = 1;
 	terms[0].subexpr.contents = inner_alternatives;
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	regex_t regex = { .count = 1, .capacity = 1, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -253,7 +259,7 @@ static void test_subexpression(void)
 	ASSERT_TRUE(accepts(&fsa, "a"));
 	ASSERT_FALSE(accepts(&fsa, "b"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
@@ -263,16 +269,16 @@ static void test_class(void)
 	class_contents[0] = 'a';
 	class_contents[1] = 'b';
 	class_contents[2] = 'c';
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_CLASS;
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_CLASS;
 	terms[0].class.negated = false;
 	terms[0].class.count = terms[0].class.capacity = 3;
 	terms[0].class.contents = class_contents;
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	const regex_t regex
+	const parse_tree_t regex
 	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
@@ -285,7 +291,7 @@ static void test_class(void)
 	ASSERT_FALSE(accepts(&fsa, "aa"));
 	ASSERT_FALSE(accepts(&fsa, "d"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
@@ -295,16 +301,16 @@ static void test_negated_class(void)
 	class_contents[0] = 'a';
 	class_contents[1] = 'b';
 	class_contents[2] = 'c';
-	regex_term_t *terms = malloc(1 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_CLASS;
+	parse_term_t *terms = malloc(1 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_CLASS;
 	terms[0].class.negated = true;
 	terms[0].class.count = terms[0].class.capacity = 3;
 	terms[0].class.contents = class_contents;
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms;
-	const regex_t regex
+	const parse_tree_t regex
 	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
@@ -318,42 +324,43 @@ static void test_negated_class(void)
 	ASSERT_FALSE(accepts(&fsa, ""));
 	ASSERT_FALSE(accepts(&fsa, "aa"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_sequence_containing_starred_union(void)
 {
 	// ab(c|d)*
-	regex_term_t *inner_terms0 = malloc(1 * sizeof(regex_term_t));
-	inner_terms0[0].quantifier = REGEX_QUANTIFIER_NONE;
-	inner_terms0[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *inner_terms0 = malloc(1 * sizeof(parse_term_t));
+	inner_terms0[0].quantifier = PARSE_QUANTIFIER_NONE;
+	inner_terms0[0].type = PARSE_TERM_LITERAL;
 	inner_terms0[0].literal = 'c';
-	regex_term_t *inner_terms1 = malloc(1 * sizeof(regex_term_t));
-	inner_terms1[0].quantifier = REGEX_QUANTIFIER_NONE;
-	inner_terms1[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *inner_terms1 = malloc(1 * sizeof(parse_term_t));
+	inner_terms1[0].quantifier = PARSE_QUANTIFIER_NONE;
+	inner_terms1[0].type = PARSE_TERM_LITERAL;
 	inner_terms1[0].literal = 'd';
-	regex_sequence_t *inner_alternatives
-	    = malloc(2 * sizeof(regex_sequence_t));
+	parse_sequence_t *inner_alternatives
+	    = malloc(2 * sizeof(parse_sequence_t));
 	inner_alternatives[0].count = inner_alternatives[0].capacity = 1;
 	inner_alternatives[0].contents = inner_terms0;
 	inner_alternatives[1].count = inner_alternatives[1].capacity = 1;
 	inner_alternatives[1].contents = inner_terms1;
-	regex_term_t *terms = malloc(3 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *terms = malloc(3 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_LITERAL;
 	terms[0].literal = 'a';
-	terms[1].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[1].type = REGEX_TERM_LITERAL;
+	terms[1].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[1].type = PARSE_TERM_LITERAL;
 	terms[1].literal = 'b';
-	terms[2].quantifier = REGEX_QUANTIFIER_STAR;
-	terms[2].type = REGEX_TERM_SUBEXPR;
+	terms[2].quantifier = PARSE_QUANTIFIER_STAR;
+	terms[2].type = PARSE_TERM_SUBEXPR;
 	terms[2].subexpr.count = terms[2].subexpr.capacity = 2;
 	terms[2].subexpr.contents = inner_alternatives;
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 3;
 	alternatives[0].contents = terms;
-	regex_t regex = { .count = 1, .capacity = 1, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -369,7 +376,7 @@ static void test_sequence_containing_starred_union(void)
 	ASSERT_FALSE(accepts(&fsa, "d"));
 	ASSERT_FALSE(accepts(&fsa, "foo"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
@@ -377,23 +384,24 @@ static void
 test_union_of_single_term_and_sequence_containing_starred_term(void)
 {
 	// a|b*c
-	regex_term_t *terms0 = malloc(1 * sizeof(regex_term_t));
-	terms0[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms0[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *terms0 = malloc(1 * sizeof(parse_term_t));
+	terms0[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms0[0].type = PARSE_TERM_LITERAL;
 	terms0[0].literal = 'a';
-	regex_term_t *terms1 = malloc(2 * sizeof(regex_term_t));
-	terms1[0].quantifier = REGEX_QUANTIFIER_STAR;
-	terms1[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *terms1 = malloc(2 * sizeof(parse_term_t));
+	terms1[0].quantifier = PARSE_QUANTIFIER_STAR;
+	terms1[0].type = PARSE_TERM_LITERAL;
 	terms1[0].literal = 'b';
-	terms1[1].quantifier = REGEX_QUANTIFIER_NONE;
-	terms1[1].type = REGEX_TERM_LITERAL;
+	terms1[1].quantifier = PARSE_QUANTIFIER_NONE;
+	terms1[1].type = PARSE_TERM_LITERAL;
 	terms1[1].literal = 'c';
-	regex_sequence_t *alternatives = malloc(2 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(2 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 1;
 	alternatives[0].contents = terms0;
 	alternatives[1].count = alternatives[1].capacity = 2;
 	alternatives[1].contents = terms1;
-	regex_t regex = { .count = 2, .capacity = 2, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 2, .capacity = 2, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -405,38 +413,39 @@ test_union_of_single_term_and_sequence_containing_starred_term(void)
 	ASSERT_FALSE(accepts(&fsa, "foo"));
 	ASSERT_FALSE(accepts(&fsa, "ba"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 
 static void test_sequence_of_subexpr_a_or_empty_and_b(void)
 {
 	// (a|ε)b
-	regex_term_t *inner_terms0 = malloc(1 * sizeof(regex_term_t));
-	inner_terms0[0].quantifier = REGEX_QUANTIFIER_NONE;
-	inner_terms0[0].type = REGEX_TERM_LITERAL;
+	parse_term_t *inner_terms0 = malloc(1 * sizeof(parse_term_t));
+	inner_terms0[0].quantifier = PARSE_QUANTIFIER_NONE;
+	inner_terms0[0].type = PARSE_TERM_LITERAL;
 	inner_terms0[0].literal = 'a';
-	regex_term_t *inner_terms1 = malloc(1 * sizeof(regex_term_t));
-	inner_terms1[0].quantifier = REGEX_QUANTIFIER_NONE;
-	inner_terms1[0].type = REGEX_TERM_EMPTY;
-	regex_sequence_t *inner_alternatives
-	    = malloc(2 * sizeof(regex_sequence_t));
+	parse_term_t *inner_terms1 = malloc(1 * sizeof(parse_term_t));
+	inner_terms1[0].quantifier = PARSE_QUANTIFIER_NONE;
+	inner_terms1[0].type = PARSE_TERM_EMPTY;
+	parse_sequence_t *inner_alternatives
+	    = malloc(2 * sizeof(parse_sequence_t));
 	inner_alternatives[0].count = inner_alternatives[0].capacity = 1;
 	inner_alternatives[0].contents = inner_terms0;
 	inner_alternatives[1].count = inner_alternatives[1].capacity = 1;
 	inner_alternatives[1].contents = inner_terms1;
-	regex_term_t *terms = malloc(2 * sizeof(regex_term_t));
-	terms[0].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[0].type = REGEX_TERM_SUBEXPR;
+	parse_term_t *terms = malloc(2 * sizeof(parse_term_t));
+	terms[0].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[0].type = PARSE_TERM_SUBEXPR;
 	terms[0].subexpr.count = terms[0].subexpr.capacity = 2;
 	terms[0].subexpr.contents = inner_alternatives;
-	terms[1].quantifier = REGEX_QUANTIFIER_NONE;
-	terms[1].type = REGEX_TERM_LITERAL;
+	terms[1].quantifier = PARSE_QUANTIFIER_NONE;
+	terms[1].type = PARSE_TERM_LITERAL;
 	terms[1].literal = 'b';
-	regex_sequence_t *alternatives = malloc(1 * sizeof(regex_sequence_t));
+	parse_sequence_t *alternatives = malloc(1 * sizeof(parse_sequence_t));
 	alternatives[0].count = alternatives[0].capacity = 2;
 	alternatives[0].contents = terms;
-	regex_t regex = { .count = 1, .capacity = 1, .contents = alternatives };
+	parse_tree_t regex
+	    = { .count = 1, .capacity = 1, .contents = alternatives };
 
 	fsa_t fsa;
 	construct_nfa(&regex, &fsa);
@@ -446,7 +455,7 @@ static void test_sequence_of_subexpr_a_or_empty_and_b(void)
 	ASSERT_FALSE(accepts(&fsa, ""));
 	ASSERT_FALSE(accepts(&fsa, "a"));
 
-	regex_free(&regex);
+	parse_tree_free(&regex);
 	fsa_free(&fsa);
 }
 

tests/parse_tests.c

@@ -10,268 +10,268 @@
 
 static void a_has_1_alternative(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("a", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void a_pipe_b_has_2_alternatives(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("a|b", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(2, t.count);
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void a_pipe_b_pipe_c_has_3_alternatives(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("a|b|c", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(3, t.count);
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void a_is_parsed_as_unquantified_literal(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("a", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, t.contents[0].contents[0].type);
 	ASSERT_EQ('a', t.contents[0].contents[0].literal);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void b_is_parsed_as_unquantified_literal(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("b", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, t.contents[0].contents[0].type);
 	ASSERT_EQ('b', t.contents[0].contents[0].literal);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void abc_is_parsed_as_sequence_of_unquantified_literals(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("abc", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(3, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, t.contents[0].contents[0].type);
 	ASSERT_EQ('a', t.contents[0].contents[0].literal);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[1].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, t.contents[0].contents[1].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[1].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, t.contents[0].contents[1].type);
 	ASSERT_EQ('b', t.contents[0].contents[1].literal);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[2].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, t.contents[0].contents[2].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[2].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, t.contents[0].contents[2].type);
 	ASSERT_EQ('c', t.contents[0].contents[2].literal);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void dot_is_parsed_as_unquantified_wildcard_term(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING(".", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_WILDCARD, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_WILDCARD, t.contents[0].contents[0].type);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void backslash_dot_is_parsed_as_unquantified_literal(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("\\.", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, t.contents[0].contents[0].type);
 	ASSERT_EQ('.', t.contents[0].contents[0].literal);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void backslash_backslash_is_parsed_as_unquantified_literal(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("\\\\", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, t.contents[0].contents[0].type);
 	ASSERT_EQ('\\', t.contents[0].contents[0].literal);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void a_pipe_b_in_parens_is_parsed_as_subexpr_term(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("(a|b)", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_SUBEXPR, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_SUBEXPR, t.contents[0].contents[0].type);
 
-	const regex_t *inner = &t.contents[0].contents[0].subexpr;
+	const parse_tree_t *inner = &t.contents[0].contents[0].subexpr;
 	ASSERT_EQ(2, inner->count);
 
 	ASSERT_EQ(1, inner->contents[0].count);
 	ASSERT_EQ(
-	    REGEX_QUANTIFIER_NONE, inner->contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, inner->contents[0].contents[0].type);
+	    PARSE_QUANTIFIER_NONE, inner->contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, inner->contents[0].contents[0].type);
 	ASSERT_EQ('a', inner->contents[0].contents[0].literal);
 
 	ASSERT_EQ(1, inner->contents[1].count);
 	ASSERT_EQ(
-	    REGEX_QUANTIFIER_NONE, inner->contents[1].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, inner->contents[1].contents[0].type);
+	    PARSE_QUANTIFIER_NONE, inner->contents[1].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, inner->contents[1].contents[0].type);
 	ASSERT_EQ('b', inner->contents[1].contents[0].literal);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void a_in_parens_b_is_parsed_as_sequence_with_subexpr_term(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("(a)b", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(2, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_SUBEXPR, t.contents[0].contents[0].type);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[1].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, t.contents[0].contents[1].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_SUBEXPR, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[1].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, t.contents[0].contents[1].type);
 	ASSERT_EQ('b', t.contents[0].contents[1].literal);
 
-	const regex_t *inner = &t.contents[0].contents[0].subexpr;
+	const parse_tree_t *inner = &t.contents[0].contents[0].subexpr;
 	ASSERT_EQ(1, inner->contents[0].count);
 	ASSERT_EQ(
-	    REGEX_QUANTIFIER_NONE, inner->contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_LITERAL, inner->contents[0].contents[0].type);
+	    PARSE_QUANTIFIER_NONE, inner->contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_LITERAL, inner->contents[0].contents[0].type);
 	ASSERT_EQ('a', inner->contents[0].contents[0].literal);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void dot_star_is_parsed_as_star_quantified_wildcard(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING(".*", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_STAR, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_WILDCARD, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_STAR, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_WILDCARD, t.contents[0].contents[0].type);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void dot_plus_is_parsed_as_plus_quantified_wildcard(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING(".+", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_PLUS, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_WILDCARD, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_PLUS, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_WILDCARD, t.contents[0].contents[0].type);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void dot_question_mark_is_parsed_as_qmrk_quantified_wildcard(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING(".?", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_QMARK, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_WILDCARD, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_QMARK, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_WILDCARD, t.contents[0].contents[0].type);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void a_in_brackets_is_parsed_as_class_containing_only_a(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("[a]", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_CLASS, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_CLASS, t.contents[0].contents[0].type);
 	ASSERT_FALSE(t.contents[0].contents[0].class.negated);
 	ASSERT_EQ(1, t.contents[0].contents[0].class.count);
 	ASSERT_NOT_NULL(t.contents[0].contents[0].class.contents);
 	ASSERT_EQ('a', t.contents[0].contents[0].class.contents[0]);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 static void caret_a_in_brackets_parses_as_negated_class(void)
 {
-	regex_t t;
+	parse_tree_t t;
 	const int result = PARSE_EXPR_STRING("[^a]", &t);
 	ASSERT_NE(-1, result);
 	ASSERT_EQ(1, t.count);
 	ASSERT_NOT_NULL(t.contents);
 
 	ASSERT_EQ(1, t.contents[0].count);
-	ASSERT_EQ(REGEX_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
-	ASSERT_EQ(REGEX_TERM_CLASS, t.contents[0].contents[0].type);
+	ASSERT_EQ(PARSE_QUANTIFIER_NONE, t.contents[0].contents[0].quantifier);
+	ASSERT_EQ(PARSE_TERM_CLASS, t.contents[0].contents[0].type);
 	ASSERT_TRUE(t.contents[0].contents[0].class.negated);
 	ASSERT_EQ(1, t.contents[0].contents[0].class.count);
 	ASSERT_NOT_NULL(t.contents[0].contents[0].class.contents);
 	ASSERT_EQ('a', t.contents[0].contents[0].class.contents[0]);
 
-	regex_free(&t);
+	parse_tree_free(&t);
 }
 
 int main(void)