1 files changed, 100 insertions, 0 deletions
diff --git a/atom.c b/atom.c
new file mode 100644
index 0000000..73ecd7e
--- /dev/null
+++ b/atom.c
@@ -0,0 +1,100 @@
+#include "atom.h"
+#include "list.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+struct atom true_atom;
+struct atom false_atom;
+struct atom nil_atom;
+
+struct atom *atom_new(char type)
+{
+    struct atom *atom = calloc(1, sizeof(*atom));
+    atom->type = type;
+    return atom;
+}
+
+struct atom *atom_new_int(long l)
+{
+    struct atom *atom = atom_new(ATOM_INT);
+    atom->l = l;
+    return atom;
+}
+
+struct atom *atom_new_str(const char *str, int len)
+{
+    struct atom *atom = atom_new(ATOM_STR);
+    atom->str.str = strndup(str, len);
+    atom->str.len = len;
+    return atom;
+}
+
+struct atom *atom_new_sym(const char *sym, int len)
+{
+    struct atom *atom = atom_new_str(sym, len);
+    atom->type = ATOM_SYMBOL;
+    return atom;
+}
+
+struct atom *atom_new_list(struct list *list)
+{
+    struct atom *atom = atom_new(ATOM_LIST);
+    atom->list = list;
+    return atom;
+}
+
+#ifdef BUILD_TEST
+
+#include "test_util.h"
+
+TEST(atom_new)
+{
+    struct atom *atom = atom_new(ATOM_STR);
+    ASSERT_TRUE(atom != NULL);
+    ASSERT_EQ(ATOM_STR, atom->type);
+}
+
+TEST(atom_new_int)
+{
+    struct atom *atom = atom_new_int(42);
+    ASSERT_TRUE(atom != NULL);
+    ASSERT_EQ(42, atom->l);
+}
+
+TEST(atom_new_str)
+{
+    struct atom *atom = atom_new_str("foobar", 6);
+    ASSERT_TRUE(atom != NULL);
+    ASSERT_STREQ("foobar", atom->str.str);
+
+    atom = atom_new_str("foobar", 3);
+    ASSERT_TRUE(atom != NULL);
+    ASSERT_STREQ("foo", atom->str.str);
+
+    ASSERT_EQ(ATOM_STR, atom->type);
+}
+
+TEST(atom_new_sym)
+{
+    struct atom *atom = atom_new_sym("foobar", 6);
+    ASSERT_TRUE(atom != NULL);
+    ASSERT_STREQ("foobar", atom->str.str);
+
+    atom = atom_new_sym("foobar", 3);
+    ASSERT_TRUE(atom != NULL);
+    ASSERT_STREQ("foo", atom->str.str);
+
+    ASSERT_EQ(ATOM_SYMBOL, atom->type);
+}
+
+TEST(atom_new_list)
+{
+    struct list list;
+    struct atom *atom = atom_new_list(&list);
+    ASSERT_TRUE(atom != NULL);
+    ASSERT_EQ(&list, atom->list);
+    ASSERT_EQ(ATOM_LIST, atom->type);
+}
+
+#endif