From a938b755197e8a2ea660cfae1b1ef160e8d59e11 Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 30 Sep 2018 17:31:10 +0200
Subject: Add serd_env_copy() and serd_env_equals()

---
 serd/serd.h      | 14 ++++++++++++++
 src/env.c        | 36 ++++++++++++++++++++++++++++++++++++
 tests/env_test.c | 19 +++++++++++++++++++
 3 files changed, 69 insertions(+)

diff --git a/serd/serd.h b/serd/serd.h
index 135e2b81..89d5b4eb 100644
--- a/serd/serd.h
+++ b/serd/serd.h
@@ -938,6 +938,20 @@ SERD_API
 SerdEnv*
 serd_env_new(const SerdNode* base_uri);
 
+/**
+   Copy an environment.
+*/
+SERD_API
+SerdEnv*
+serd_env_copy(const SerdEnv* env);
+
+/**
+   Return true iff `a` is equal to `b`.
+*/
+SERD_API
+bool
+serd_env_equals(const SerdEnv* a, const SerdEnv* b);
+
 /**
    Free `ns`.
 */
diff --git a/src/env.c b/src/env.c
index 15e49413..6828a0fd 100644
--- a/src/env.c
+++ b/src/env.c
@@ -47,6 +47,22 @@ serd_env_new(const SerdNode* base_uri)
 	return env;
 }
 
+SerdEnv*
+serd_env_copy(const SerdEnv* env)
+{
+	SerdEnv* copy = (SerdEnv*)calloc(1, sizeof(struct SerdEnvImpl));
+
+	copy->n_prefixes = env->n_prefixes;
+	copy->prefixes = (SerdPrefix*)malloc(copy->n_prefixes * sizeof(SerdPrefix));
+	for (size_t i = 0; i < copy->n_prefixes; ++i) {
+		copy->prefixes[i].name = serd_node_copy(env->prefixes[i].name);
+		copy->prefixes[i].uri  = serd_node_copy(env->prefixes[i].uri);
+	}
+
+	serd_env_set_base_uri(copy, serd_env_base_uri(env));
+	return copy;
+}
+
 void
 serd_env_free(SerdEnv* env)
 {
@@ -63,6 +79,26 @@ serd_env_free(SerdEnv* env)
 	free(env);
 }
 
+bool
+serd_env_equals(const SerdEnv* a, const SerdEnv* b)
+{
+	if (!a || !b) {
+		return !a == !b;
+	} else if (a->n_prefixes != b->n_prefixes ||
+	    !serd_node_equals(a->base_uri_node, b->base_uri_node)) {
+		return false;
+	}
+
+	for (size_t i = 0; i < a->n_prefixes; ++i) {
+		if (!serd_node_equals(a->prefixes[i].name, b->prefixes[i].name) ||
+		    !serd_node_equals(a->prefixes[i].uri, b->prefixes[i].uri)) {
+			return false;
+		}
+	}
+
+	return true;
+}
+
 const SerdURI*
 serd_env_get_parsed_base_uri(const SerdEnv* env)
 {
diff --git a/tests/env_test.c b/tests/env_test.c
index e507bfc9..25164701 100644
--- a/tests/env_test.c
+++ b/tests/env_test.c
@@ -95,6 +95,24 @@ test_env(void)
 
 	SerdNode* qualified = serd_env_qualify(env, foo_u);
 	assert(serd_node_equals(qualified, foo_c));
+
+	SerdEnv* env_copy = serd_env_copy(env);
+	assert(serd_env_equals(env, env_copy));
+	assert(!serd_env_equals(env, NULL));
+	assert(!serd_env_equals(NULL, env));
+	assert(serd_env_equals(NULL, NULL));
+
+	SerdNode* qualified2 = serd_env_expand(env_copy, foo_u);
+	assert(serd_node_equals(qualified, foo_c));
+	serd_node_free(qualified2);
+
+	serd_env_set_prefix_from_strings(
+	        env_copy, "test", "http://example.org/test");
+	assert(!serd_env_equals(env, env_copy));
+
+	serd_env_set_prefix_from_strings(env, "test2", "http://example.org/test");
+	assert(!serd_env_equals(env, env_copy));
+
 	serd_node_free(qualified);
 	serd_node_free(foo_c);
 	serd_node_free(foo_u);
@@ -102,6 +120,7 @@ test_env(void)
 	serd_node_free(b);
 	serd_node_free(pre);
 	serd_node_free(eg);
+	serd_env_free(env_copy);
 
 	serd_env_free(env);
 	serd_world_free(world);
-- 
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