Start building AST in parser

spec/runtime/tree_spec.cpp

@@ -0,0 +1,59 @@
+#include "spec_helper.h"
+#include "tree.h"
+
+START_TEST
+
+enum { cat, dog, pig };
+static const char *names[] = { "cat", "dog", "pig" };
+
+describe("trees", []() {
+    TSTree *tree1, *parent1;
+    
+    before_each([&]() {
+        tree1 = TSTreeMake(cat, 0, NULL);
+        parent1 = TSTreeMake(dog, 1, &tree1);
+    });
+    
+    after_each([&]() {
+        TSTreeRelease(tree1);
+        TSTreeRelease(parent1);
+    });
+
+    describe("equality", [&]() {
+        it("returns true for identical trees", [&]() {
+            TSTree *tree2 = TSTreeMake(cat, 0, NULL);
+            AssertThat(TSTreeEquals(tree1, tree2), Equals(1));
+            
+            TSTree *parent2 = TSTreeMake(dog, 1, &tree2);
+            AssertThat(TSTreeEquals(parent1, parent2), Equals(1));
+            
+            TSTreeRelease(tree2);
+            TSTreeRelease(parent2);
+        });
+        
+        it("returns false for different trees", [&]() {
+            TSTree *different_tree = TSTreeMake(pig, 0, NULL);
+            AssertThat(TSTreeEquals(tree1, different_tree), Equals(0));
+            
+            TSTree *different_parent = TSTreeMake(dog, 1, &different_tree);
+            AssertThat(TSTreeEquals(parent1, different_parent), Equals(0));
+            
+            TSTree *parent_with_same_type = TSTreeMake(cat, 1, &different_parent);
+            AssertThat(TSTreeEquals(parent_with_same_type, tree1), Equals(0));
+            AssertThat(TSTreeEquals(tree1, parent_with_same_type), Equals(0));
+            
+            TSTreeRelease(different_tree);
+            TSTreeRelease(different_parent);
+            TSTreeRelease(parent_with_same_type);
+        });
+    });
+    
+    describe("serialization", [&]() {
+        it("returns a readable string", [&]() {
+            AssertThat(string(TSTreeToString(tree1, names)), Equals("(cat)"));
+            AssertThat(string(TSTreeToString(parent1, names)), Equals("(dog (cat))"));
+        });
+    });
+});
+
+END_TEST