Initial. Set up Cmake for HexCalcLib. Start writing library

.gitignore

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+.idea
+build*
+*build
+cmake-build*

.gitmodules

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+[submodule "lib/GSL"]
+	path = lib/GSL
+	url = https://github.com/Microsoft/GSL.git

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.0)
+
+project(HexCalc)
+
+#add_executable(HexCalc main.cpp)
+#target_link_libraries(HexCalc)
+
+add_subdirectory(lib)

lib/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.0)
+
+project(HexCalcLib)
+set(GSL_TEST_DIR ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY})
+set(GSL_TEST_FILE ${GSL_TEST_DIR}/gsl-test.cpp)
+
+
+#Try find GSL project
+set(GSL_INCLUDE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/GSL/include")
+set(INCLUDE_DIRECTORIES "${INCLUDE_DIRECTORIES} ${CMAKE_CURRENT_SOURCE_DIR}/GSL/include")
+file(WRITE ${GSL_TEST_FILE}
+"#include <gsl/gsl>
+#include <gsl/span>
+int main() {
+	gsl::cstring_span<> S = \"Hello, GSL\";
+	return 0;
+}
+"
+)
+try_compile(GSL_COMPILED ${GSL_TEST_DIR} SOURCES ${GSL_TEST_FILE}
+    COMPILE_DEFINITIONS -I${GSL_INCLUDE_DIR})
+#
+# Project has a GSL dependency. if HexCalcLib can not be compiled =>
+# we should download project from git repository
+if (NOT GSL_COMPILED)
+	message(STATUS "GSL was not found in system. Start downloading it.")
+  message(STATUS "If something goes wrong, update submodule by yourselves with commands:\
+    \n\t\t\tgit init\
+    \n\t\t\tgit update")
+  find_program(GIT_COMMAND NAMES git)
+  if (NOT GIT_COMMAND)
+    message(FATAL_ERROR "Could not find git command. Install it and retry")
+  endif()
+  message(STATUS Git found: ${GIT_COMMAND})
+
+	execute_process(COMMAND "${GIT_COMMAND}" submodule init RESULT_VARIABLE GSL_INITED)
+	if (NOT GSL_INITED EQUAL 0)
+		message(FATAL_ERROR "Can't initialize submodule GSL in lib directory")
+	endif()
+
+	execute_process(COMMAND "${GIT_COMMAND}" submodule update RESULT_VARIABLE GSL_UPDATED)
+	if (NOT GSL_UPDATED EQUAL 0)
+		message(FATAL_ERROR "Can't update submodule GSL in lib directory")
+	endif()
+
+	message(STATUS "GSL was successfully downloaded")
+endif(NOT GSL_COMPILED)
+
+set(sources source/HexCalcLib.cpp)
+
+add_library(HexCalcLib ${sources})
+target_include_directories(HexCalcLib PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/include)
+target_include_directories(HexCalcLib PRIVATE ${GSL_INCLUDE_DIR})

lib/include/hexCalc.h

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+#pragma once

lib/source/HexCalcLib.cpp

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+#include "hexCalc.h"
+#include <string>
+
+using namespace std;
+
+// Decided not to use hard-weighted libraries like
+struct StringView
+{
+
+};
+
+
+enum class Associativity
+{
+  Left,
+  Right
+};
+
+// TODO: add ~
+
+class TokenOperation
+{
+public:
+  TokenOperation(Associativity associativity, const int precedence, const string &representation)
+    : associativity(associativity)
+    , precedence(precedence)
+    , representation(representation)
+  {}
+
+  Associativity getAssociativity() const { return associativity;}
+  int getPrecedence() const { return precedence; }
+  const string &getRepresentation() const { return representation; }
+
+private:
+  Associativity associativity;
+  int precedence;
+  const string representation;
+};
+
+// TODO: watch c++ precedence
+// TODO: add unary operators ~, -
+
+// Binary operations
+const TokenOperation operations[]
+  {
+    TokenOperation(Associativity::Left, 20, "+"),
+    TokenOperation(Associativity::Left, 20, "-"),
+    TokenOperation(Associativity::Left, 30, "*"),
+    TokenOperation(Associativity::Left, 30, "/"),
+    TokenOperation(Associativity::Left, 30, "%"),
+    TokenOperation(Associativity::Left, 8, "|"),
+    TokenOperation(Associativity::Left, 9, "^"),
+    TokenOperation(Associativity::Left, 10, "&"),
+    TokenOperation(Associativity::Left, 15, "<<"),
+    TokenOperation(Associativity::Left, 15, ">>"),
+    TokenOperation(Associativity::Right, 99, "e"),
+    TokenOperation(Associativity::Right, 40, "**"),
+  };
+
+

readme.md

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+# Calculator with Hex and Binary support
+
+Project was inspired by sencalc. This calculator is cross-platform and has some extra features to its predecessor