5 files changed, 92 insertions, 2 deletions
diff --git a/include/cru/parse/Grammar.hpp b/include/cru/parse/Grammar.hpp
index e69de29b..dd4741df 100644
--- a/include/cru/parse/Grammar.hpp
+++ b/include/cru/parse/Grammar.hpp
@@ -0,0 +1,42 @@
+#pragma once
+#include "Production.hpp"
+
+#include <vector>
+
+namespace cru::parse {
+class Grammar : public Object {
+ public:
+  Grammar();
+
+  CRU_DELETE_COPY(Grammar)
+  CRU_DELETE_MOVE(Grammar)
+
+  ~Grammar() override;
+
+ public:
+  void SetStartSymbol(Nonterminal* start_symbol);
+
+  Terminal* CreateTerminal(String name);
+  Nonterminal* CreateNonterminal(String name);
+  Production* CreateProduction(String name, Nonterminal* left,
+                               std::vector<Symbol*> right);
+
+ public:  // Getters
+  Nonterminal* GetStartSymbol() const { return start_symbol_; }
+  const std::vector<Terminal*>& GetTerminals() const { return terminals_; }
+  const std::vector<Nonterminal*>& GetNonterminals() const {
+    return nonterminals_;
+  }
+  const std::vector<Symbol*>& GetSymbols() const { return symbols_; }
+  const std::vector<Production*>& GetProductions() const {
+    return productions_;
+  }
+
+ private:
+  Nonterminal* start_symbol_;
+  std::vector<Terminal*> terminals_;
+  std::vector<Nonterminal*> nonterminals_;
+  std::vector<Symbol*> symbols_;
+  std::vector<Production*> productions_;
+};
+}  // namespace cru::parse
diff --git a/include/cru/parse/Production.hpp b/include/cru/parse/Production.hpp
index e69de29b..bd05a8c4 100644
--- a/include/cru/parse/Production.hpp
+++ b/include/cru/parse/Production.hpp
@@ -0,0 +1,36 @@
+#pragma once
+#include "cru/common/String.hpp"
+
+#include "Nonterminal.hpp"
+#include "Terminal.hpp"
+
+#include <vector>
+
+namespace cru::parse {
+class Production : public Object {
+ public:
+  Production(Grammar* grammar, String name, Nonterminal* left,
+             std::vector<Symbol*> right);
+
+  CRU_DELETE_COPY(Production)
+  CRU_DELETE_MOVE(Production)
+
+  ~Production() override;
+
+ public:
+  Grammar* GetGrammar() const { return grammar_; }
+
+  Nonterminal* GetLeft() const { return left_; }
+  void SetLeft(Nonterminal* left);
+
+  const std::vector<Symbol*>& GetRight() const { return right_; }
+  void SetRight(std::vector<Symbol*> right);
+
+ private:
+  Grammar* grammar_;
+  String name_;
+
+  Nonterminal* left_;
+  std::vector<Symbol*> right_;
+};
+}  // namespace cru::parse
diff --git a/include/cru/parse/Symbol.hpp b/include/cru/parse/Symbol.hpp
index 5c862c25..e22fb9bc 100644
--- a/include/cru/parse/Symbol.hpp
+++ b/include/cru/parse/Symbol.hpp
@@ -7,7 +7,7 @@ class Grammar;
 // Base class of Terminal and Nonterminal.
 class Symbol : public Object {
  public:
-  Symbol(Grammar* grammar, String name);
+  explicit Symbol(Grammar* grammar, String name);
 
   CRU_DELETE_COPY(Symbol)
   CRU_DELETE_MOVE(Symbol)
diff --git a/include/cru/parse/Terminal.hpp b/include/cru/parse/Terminal.hpp
index b42ba1f9..8d4a31b6 100644
--- a/include/cru/parse/Terminal.hpp
+++ b/include/cru/parse/Terminal.hpp
@@ -4,7 +4,7 @@
 namespace cru::parse {
 class Terminal : public Symbol {
  public:
-  explicit Terminal(Grammar* grammar, String name);
+  Terminal(Grammar* grammar, String name);
 
   CRU_DELETE_COPY(Terminal)
   CRU_DELETE_MOVE(Terminal)
diff --git a/src/parse/Production.cpp b/src/parse/Production.cpp
index e69de29b..52ec46ab 100644
--- a/src/parse/Production.cpp
+++ b/src/parse/Production.cpp
@@ -0,0 +1,12 @@
+#include "cru/parse/Production.hpp"
+
+namespace cru::parse {
+Production::Production(Grammar* grammar, String name, Nonterminal* left,
+                       std::vector<Symbol*> right)
+    : grammar_(grammar),
+      name_(std::move(name)),
+      left_(left),
+      right_(std::move(right)) {}
+
+Production::~Production() {}
+}  // namespace cru::parse