2 files changed, 79 insertions, 0 deletions
diff --git a/src/include/calculator.hpp b/src/include/calculator.hpp
new file mode 100644
index 0000000..8c5e97a
--- /dev/null
+++ b/src/include/calculator.hpp
@@ -0,0 +1,32 @@
+#pragma once
+#include "LCD_I2C.hpp"
+#include "keypad.hpp"
+#include "tokenizer.hpp"
+#define LCD_COLUMNS 16
+#define LCD_ROWS 2
+#define I2C_ADDRESS 0x27
+
+class Calculator {
+private:
+  LCD_I2C *display;
+  Keypad *default_keypad;
+  Tokenizer tokenizer = Tokenizer();
+  char default_keypad_chars[4][4] = {
+    {'1', '2', '3', '+'},
+    {'4', '5', '6', '-'},
+    {'7', '8', '9', '*'},
+    {'(', '0', ')', '='}
+  };
+  char secondary_keypad[4][4] = {
+    {'1', '2', '3', '+'},
+    {'4', '5', '6', '-'},
+    {'7', '8', '9', '/'},
+    {'(', '0', ')', '='}
+  };
+  uint keypad_col_pins[4] = {6, 7, 8, 9};
+  uint keypad_row_pins[4] = {16, 17, 18, 19};
+public:
+  Calculator();
+  ~Calculator();
+  void run();
+};
diff --git a/src/include/tokenizer.hpp b/src/include/tokenizer.hpp
new file mode 100644
index 0000000..a3f9998
--- /dev/null
+++ b/src/include/tokenizer.hpp
@@ -0,0 +1,47 @@
+#pragma once
+#include <regex>
+#include <string>
+#include <array>
+
+enum Type {
+  operand,
+  sum,
+  substraction,
+  multiplication,
+  division,
+  left_parens,
+  right_parens,
+  equals
+};
+
+struct Token {
+  Type type;
+  int value;
+};
+
+class Tokenizer {
+private:
+  // Private attributes
+  std::array<Token *, 16> tokens;
+  const std::string *to_tokenize;
+  size_t current_char_index;
+  short tokens_head;
+  // Regexes
+  std::regex operand_regex = std::regex("^0{1}|\\d+");
+  std::regex operation_regex = std::regex("\\+|-|/|\\*");
+  std::regex parens_regex = std::regex("(|)");
+  // End of private attributes
+  // Private methods
+  void clearTokens();
+  void insertToken(Type type, int value);
+  void matchOperation(const std::string &operation);
+  void matchParens(const std::string &operation);
+  void matchOperand(const std::string &operation);
+  std::string buildNumber(char *current);
+  // End of private methods 
+public:
+  Tokenizer();
+  ~Tokenizer();
+  const std::array<Token *, 16> &tokenize(const std::string &operation);
+  const std::array<Token *, 16> &getTokens();
+};