From a5e287f4dcf982ab0263b2dffacb16a84429ff58 Mon Sep 17 00:00:00 2001
From: =?utf8?q?=EB=B0=95=EC=A2=85=ED=98=84/=EB=8F=99=EC=9E=91=EC=A0=9C?=
 =?utf8?q?=EC=96=B4Lab=28SR=29/Staff=20Engineer/=EC=82=BC=EC=84=B1?=
 =?utf8?q?=EC=A0=84=EC=9E=90?= <jh1302.park@samsung.com>
Date: Tue, 17 Jul 2018 15:01:51 +0900
Subject: [PATCH] [nest] Add 'Block' class (#684)

This commit adds 'Block' class which maintains a sequence of nest
statements.

Signed-off-by: Jonghyun Park <jh1302.park@samsung.com>
---
 contrib/nest/include/nest/Block.h | 30 ++++++++++++++++++++++++++++++
 contrib/nest/include/nest/Stmt.h  |  9 +++++++++
 contrib/nest/src/Block.test.cpp   | 25 +++++++++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 contrib/nest/include/nest/Block.h
 create mode 100644 contrib/nest/src/Block.test.cpp

diff --git a/contrib/nest/include/nest/Block.h b/contrib/nest/include/nest/Block.h
new file mode 100644
index 0000000..7e733d4
--- /dev/null
+++ b/contrib/nest/include/nest/Block.h
@@ -0,0 +1,30 @@
+#ifndef __NEST_BLOCK_H__
+#define __NEST_BLOCK_H__
+
+#include "nest/Stmt.h"
+
+#include <vector>
+
+#include <cstdint>
+
+namespace nest
+{
+
+struct Block
+{
+public:
+  uint32_t size(void) const { return _stmts.size(); }
+
+public:
+  const Stmt &at(uint32_t n) const { return _stmts.at(n); }
+
+public:
+  void append(const Stmt &stmt) { _stmts.emplace_back(stmt); }
+
+private:
+  std::vector<Stmt> _stmts;
+};
+
+} // namespace nest
+
+#endif // __NEST_BLOCK_H__
diff --git a/contrib/nest/include/nest/Stmt.h b/contrib/nest/include/nest/Stmt.h
index fb8d8dc..e47d07c 100644
--- a/contrib/nest/include/nest/Stmt.h
+++ b/contrib/nest/include/nest/Stmt.h
@@ -4,4 +4,13 @@
 #include "nest/stmt/Node.h"
 #include "nest/stmt/Visitor.h"
 
+#include <memory>
+
+namespace nest
+{
+
+using Stmt = std::shared_ptr<stmt::Node>;
+
+} // namespace nest
+
 #endif // __NEST_STMT_H__
diff --git a/contrib/nest/src/Block.test.cpp b/contrib/nest/src/Block.test.cpp
new file mode 100644
index 0000000..045a659
--- /dev/null
+++ b/contrib/nest/src/Block.test.cpp
@@ -0,0 +1,25 @@
+#include "nest/Block.h"
+
+#include <gtest/gtest.h>
+
+namespace
+{
+struct DummyNode final : public nest::stmt::Node
+{
+  // Dummy Node for testing
+};
+}
+
+TEST(BLOCK, use_case_1)
+{
+  nest::Block block;
+
+  ASSERT_EQ(block.size(), 0);
+
+  auto stmt = std::make_shared<DummyNode>();
+
+  block.append(stmt);
+
+  ASSERT_EQ(block.size(), 1);
+  ASSERT_EQ(block.at(0), stmt);
+}
-- 
2.7.4