From bc46da00532dd8896c1bddb3b1f279811b25d4a1 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/serd_test.c | 16 ++++++++++++++++
 3 files changed, 66 insertions(+)

diff --git a/serd/serd.h b/serd/serd.h
index bc533b5e..4fc2dc63 100644
--- a/serd/serd.h
+++ b/serd/serd.h
@@ -899,6 +899,20 @@ 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 6095ee30..fb1f183c 100644
--- a/src/env.c
+++ b/src/env.c
@@ -48,6 +48,22 @@ 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_get_base_uri(env));
+	return copy;
+}
+
 void
 serd_env_free(SerdEnv* env)
 {
@@ -60,6 +76,26 @@ 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/serd_test.c b/tests/serd_test.c
index 97966515..513344a3 100644
--- a/tests/serd_test.c
+++ b/tests/serd_test.c
@@ -457,12 +457,28 @@ main(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));
+
+	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);
 	serd_node_free(b);
 	serd_node_free(pre);
 	serd_node_free(eg);
+	serd_env_free(env_copy);
 
 	// Test SerdReader and SerdWriter
 
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