Added a skeleton for the lexer

.gitignore

@@ -1 +1,2 @@
-build/
+build/*
+.cache

CMakeLists.txt

@@ -1,3 +1,10 @@
+cmake_minimum_required(VERSION 3.16)
 project(lispy_stuff)
 
-add_executable(main src/main.cpp)
+set(HEADER_FILES src/include/lex.hpp)
+set(SOURCE_FILES src/main.cpp)
+
+
+add_executable(main ${SOURCE_FILES} ${HEADER_FILES})
+
+target_include_directories(main PRIVATE src/include/)

README.md

@@ -0,0 +1,31 @@
+# Lispy stuff
+
+Simple lisp-ish language compiler written in C++.
+
+Right now it doesn't compile much - it's just a parser.
+The goal is to emit bytecode. The bytecode format is not decided yet.
+
+## Build
+
+I use cmake for the build system. I prefer to build out-of-tree,
+here's how to build if you've never used cmake:
+
+```bash
+cd build
+cmake ..
+make
+```
+
+## Development
+
+I use clangd as the language server. Appropriate `compile_commands.json`
+(required for clangd, otherwise it can not find include files) is provided.
+If you'd like to generate them yourself, just use cmake:
+
+```bash
+cd build
+cmake -DCMAKE_EXPORT_COMPILE_COMMANDS=1 ..
+cp compile_commands.json ../
+```
+
+

compile_commands.json

@@ -0,0 +1,8 @@
+[
+{
+  "directory": "/home/haxala1r/Desktop/Programming/C++/lispy-stuff/build",
+  "command": "/usr/bin/c++  -I/home/haxala1r/Desktop/Programming/C++/lispy-stuff/src/include  -o CMakeFiles/main.dir/src/main.cpp.o -c /home/haxala1r/Desktop/Programming/C++/lispy-stuff/src/main.cpp",
+  "file": "/home/haxala1r/Desktop/Programming/C++/lispy-stuff/src/main.cpp",
+  "output": "CMakeFiles/main.dir/src/main.cpp.o"
+}
+]

src/include/lex.hpp

@@ -0,0 +1,36 @@
+#pragma once
+#include <sstream>
+#include <vector>
+#include <stdint.h>
+#include <variant>
+
+enum TokenType {
+    OpenParen,
+    CloseParen,
+    Symbol,
+    String,
+    Int,
+    End
+};
+
+// Plain Old Data
+struct Token {
+    enum TokenType type;
+    std::variant<int, std::string> value;
+};
+
+class Lexer {
+private:
+    // we use a stringstream for lexing purposes
+    std::stringstream ss;
+
+public:
+    Lexer(std::string);
+    Lexer();
+
+    void feed(std::string);
+    
+    Token next();
+    std::vector<Token> collect();
+};
+

src/lex.cpp

@@ -0,0 +1,16 @@
+#include <lex.hpp>
+#include <string>
+
+Lexer::Lexer(std::string s) : ss(s) {}
+Lexer::Lexer() : ss("") {}
+
+void Lexer::feed(std::string s) {
+    ss << s;
+}
+
+Token Lexer::next() {
+    return {TokenType::CloseParen};
+}
+
+
+

src/main.cpp

@@ -1,4 +1,6 @@
 #include <iostream>
+#include <lex.hpp>
+#include <sstream>
 
 using namespace std;