From 360a3bdbc9cf7084d9f1f1af09ea99831edffd34 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Wed, 15 Dec 2021 21:11:26 +0800
Subject: ...

---
 include/cru/parse/ParsingAlgorithm.hpp        | 22 ++++++++++++++++++++++
 include/cru/parse/ParsingAlgorithmContext.hpp | 23 +++++++++++++++++++++++
 include/cru/parse/ParsingContext.hpp          | 21 +++++++++++++++++++++
 src/parse/CMakeLists.txt                      |  3 +++
 src/parse/ParsingAlgorithm.cpp                |  1 +
 src/parse/ParsingAlgorithmContext.cpp         |  9 +++++++++
 src/parse/ParsingContext.cpp                  | 13 +++++++++++++
 7 files changed, 92 insertions(+)
 create mode 100644 include/cru/parse/ParsingAlgorithm.hpp
 create mode 100644 include/cru/parse/ParsingAlgorithmContext.hpp
 create mode 100644 include/cru/parse/ParsingContext.hpp
 create mode 100644 src/parse/ParsingAlgorithm.cpp
 create mode 100644 src/parse/ParsingAlgorithmContext.cpp
 create mode 100644 src/parse/ParsingContext.cpp

diff --git a/include/cru/parse/ParsingAlgorithm.hpp b/include/cru/parse/ParsingAlgorithm.hpp
new file mode 100644
index 00000000..1ea30a80
--- /dev/null
+++ b/include/cru/parse/ParsingAlgorithm.hpp
@@ -0,0 +1,22 @@
+#pragma once
+#include "Grammar.hpp"
+
+namespace cru::parse {
+class ParsingAlgorithmContext;
+
+// Represents a parsing algorithm.
+// It does not relate to any specific grammar.
+// It is used to validate a grammar and create a parsing algorithm context.
+class ParsingAlgorithm {
+ public:
+  ParsingAlgorithm() = default;
+
+  CRU_DELETE_COPY(ParsingAlgorithm)
+  CRU_DELETE_MOVE(ParsingAlgorithm)
+
+  ~ParsingAlgorithm() = default;
+
+  virtual bool CanHandle(Grammar* grammar) const = 0;
+  virtual ParsingAlgorithmContext* CreateContext(Grammar* grammar) const = 0;
+};
+}  // namespace cru::parse
diff --git a/include/cru/parse/ParsingAlgorithmContext.hpp b/include/cru/parse/ParsingAlgorithmContext.hpp
new file mode 100644
index 00000000..072203ec
--- /dev/null
+++ b/include/cru/parse/ParsingAlgorithmContext.hpp
@@ -0,0 +1,23 @@
+#pragma once
+#include "Grammar.hpp"
+
+namespace cru::parse {
+class ParsingAlgorithm;
+
+// A parsing algorithm context contains all data a parsing algorithm needs to
+// parse for a grammar. It does not relate to any input. For example, it can
+// contain any state machine.
+class ParsingAlgorithmContext {
+ public:
+  ParsingAlgorithmContext(Grammar* grammar, ParsingAlgorithm* algorithm);
+
+  CRU_DELETE_COPY(ParsingAlgorithmContext)
+  CRU_DELETE_MOVE(ParsingAlgorithmContext)
+
+  ~ParsingAlgorithmContext();
+
+ private:
+  Grammar* grammar_;
+  ParsingAlgorithm* algorithm_;
+};
+}  // namespace cru::parse
diff --git a/include/cru/parse/ParsingContext.hpp b/include/cru/parse/ParsingContext.hpp
new file mode 100644
index 00000000..369acf41
--- /dev/null
+++ b/include/cru/parse/ParsingContext.hpp
@@ -0,0 +1,21 @@
+#pragma once
+#include "ParsingAlgorithmContext.hpp"
+
+namespace cru::parse {
+// A parsing context contains all info that a program needs to know when parsing
+// a input sequence of terminals.
+class ParsingContext {
+ public:
+  ParsingContext(ParsingAlgorithmContext* parsing_algorithm_context,
+                 std::vector<Terminal*> input);
+
+  CRU_DELETE_COPY(ParsingContext)
+  CRU_DELETE_MOVE(ParsingContext)
+
+  ~ParsingContext();
+
+ private:
+  ParsingAlgorithmContext* parsing_algorithm_context_;
+  std::vector<Terminal*> input_;
+};
+}  // namespace cru::parse
diff --git a/src/parse/CMakeLists.txt b/src/parse/CMakeLists.txt
index 5c8a6dfa..7c868f98 100644
--- a/src/parse/CMakeLists.txt
+++ b/src/parse/CMakeLists.txt
@@ -1,6 +1,9 @@
 add_library(cru_parse SHARED
 	Grammar.cpp
 	Nonterminal.cpp
+	ParsingAlgorithm.cpp
+	ParsingAlgorithmContext.cpp
+	ParsingContext.cpp
 	Production.cpp
 	Symbol.cpp
 	Terminal.cpp
diff --git a/src/parse/ParsingAlgorithm.cpp b/src/parse/ParsingAlgorithm.cpp
new file mode 100644
index 00000000..03059e01
--- /dev/null
+++ b/src/parse/ParsingAlgorithm.cpp
@@ -0,0 +1 @@
+#include "cru/parse/ParsingAlgorithm.hpp"
diff --git a/src/parse/ParsingAlgorithmContext.cpp b/src/parse/ParsingAlgorithmContext.cpp
new file mode 100644
index 00000000..98e2343b
--- /dev/null
+++ b/src/parse/ParsingAlgorithmContext.cpp
@@ -0,0 +1,9 @@
+#include "cru/parse/ParsingAlgorithmContext.hpp"
+
+namespace cru::parse {
+ParsingAlgorithmContext::ParsingAlgorithmContext(Grammar* grammar,
+                                                 ParsingAlgorithm* algorithm)
+    : grammar_(grammar), algorithm_(algorithm) {}
+
+ParsingAlgorithmContext::~ParsingAlgorithmContext() {}
+}  // namespace cru::parse
diff --git a/src/parse/ParsingContext.cpp b/src/parse/ParsingContext.cpp
new file mode 100644
index 00000000..aafaa65b
--- /dev/null
+++ b/src/parse/ParsingContext.cpp
@@ -0,0 +1,13 @@
+#include "cru/parse/ParsingContext.hpp"
+#include "cru/parse/ParsingAlgorithmContext.hpp"
+
+namespace cru::parse {
+ParsingContext::ParsingContext(
+    ParsingAlgorithmContext* parsing_algorithm_context,
+    std::vector<Terminal*> input)
+    : parsing_algorithm_context_(parsing_algorithm_context),
+      input_(std::move(input)) {}
+
+ParsingContext::~ParsingContext() {}
+
+}  // namespace cru::parse
-- 
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