From d5d21aa422d407fb3af0153c6d4dcc7a6f7d75b3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Grodzi=C5=84ski?= <rafal.grodzinski@gmail.com>
Date: Thu, 29 May 2025 22:02:44 +0900
Subject: [PATCH] wip

---
 README.md          | 14 ++++++++++++++
 src/Expression.cpp | 14 ++++++++++++++
 src/Expression.h   | 17 +++++++++++++++++
 src/Parser.cpp     | 21 ++++++++++++++++++++-
 src/Parser.h       | 15 ++++++++++++---
 5 files changed, 77 insertions(+), 4 deletions(-)
 create mode 100644 README.md

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8edeb1b
--- /dev/null
+++ b/README.md
@@ -0,0 +1,14 @@
+expression := literal | binary | grouping
+
+literal := INTEGER
+
+grouping := "(" expression ")"
+
+binary := expression operator expression
+
+operator := "+" | "-" | "*" | "/" | "%"
+
+expression 
+term    factor "+" | "-" factor
+factor  primary  "*" | "/" primary
+primary INTEGER | "(" expression ")"
\ No newline at end of file
diff --git a/src/Expression.cpp b/src/Expression.cpp
index e69de29..e8c35f3 100644
--- a/src/Expression.cpp
+++ b/src/Expression.cpp
@@ -0,0 +1,14 @@
+#include "Expression.h"
+
+ExpressionInvalid Expression::Invalid = ExpressionInvalid();
+
+std::string ExpressionInvalid::toString() {
+    return "Invalid";
+}
+
+/*ExpressionInteger::ExpressionInteger(Token token) {
+}
+
+std::string ExpressionInteger::toString() {
+    return "INTEGER";
+}*/
\ No newline at end of file
diff --git a/src/Expression.h b/src/Expression.h
index 3795f01..5adc04b 100644
--- a/src/Expression.h
+++ b/src/Expression.h
@@ -1,8 +1,25 @@
 #ifndef EXPRESSION_H
 #define EXPRESSION_H
 
+#include "Token.h"
+
+class ExpressionInvalid;
+
 class Expression {
+public:
+    static ExpressionInvalid Invalid;
+
+    virtual std::string toString() = 0;
+};
+
+class ExpressionInvalid {
 
 };
 
+/*class ExpressionInteger: Expression {
+public:
+    ExpressionInteger(Token token);
+    std::string toString() override;
+};*/
+
 #endif
\ No newline at end of file
diff --git a/src/Parser.cpp b/src/Parser.cpp
index ff13031..f4403be 100644
--- a/src/Parser.cpp
+++ b/src/Parser.cpp
@@ -1,5 +1,24 @@
 #include "Parser.h"
 
-std::vector Parser::getExpressions() {
+Parser::Parser(std::vector<Token> tokens) : tokens(tokens) {
+}
 
+/*Expression Parser::getExpression() {
+    return term();
+}*/
+
+/*Expression Parser::term() {
+
+}*/
+
+/*Expression Parser::primary() {
+
+}*/
+
+Expression Parser::matchInteger() {
+    //Token token = tokens.at(currentIndex);
+    //if (token.getKind() == Token::Kind::INTEGER)
+    //    ExpressionInteger(token);
+
+    return Expression::Invalid;
 }
\ No newline at end of file
diff --git a/src/Parser.h b/src/Parser.h
index c2b9cfb..8ad227c 100644
--- a/src/Parser.h
+++ b/src/Parser.h
@@ -2,13 +2,22 @@
 #define PARSER_H
 
 #include <vector>
-#include <Token.h>
-#include <Expression.h>
+#include "Token.h"
+#include "Expression.h"
 
 class Parser {
+private:
+    std::vector<Token> tokens;
+    int currentIndex = 0;
+
+    //Expression term();
+    //Expression primary();
+
+    Expression matchInteger();
+
 public:
     Parser(std::vector<Token> tokens);
-    std::vector<Expression> getExpressions();
+    //Expression getExpression();
 };
 
 #endif
\ No newline at end of file