.gitignore

@@ -2,4 +2,3 @@
 .cache/
 CMakeFiles/
 CMakeCache.txt
-dub.selections.json

CMakeLists.txt

@@ -3,7 +3,8 @@ project(Elna)
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS 1)
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
-set(CMAKE_CXX_STANDARD 17)
+
+find_package(Boost COMPONENTS filesystem REQUIRED)
 
 add_executable(tester tests/runner.cpp include/elna/tester.hpp)
 target_include_directories(tester PRIVATE include)
@@ -12,14 +13,9 @@ add_executable(elnsh shell/main.cpp
 	shell/interactive.cpp include/elna/interactive.hpp
 	shell/history.cpp include/elna/history.hpp
 	shell/state.cpp include/elna/state.hpp
-)
+	shell/lexer.cpp include/elna/lexer.hpp
+	shell/result.cpp include/elna/result.hpp)
 target_include_directories(elnsh PRIVATE include)
-
+target_link_libraries(elnsh PUBLIC
-add_library(elna
+	${Boost_FILESYSTEM_LIBRARY}
-	source/lexer.cpp include/elna/lexer.hpp
-	source/result.cpp include/elna/result.hpp
-	source/riscv.cpp include/elna/riscv.hpp
-	source/ir.cpp include/elna/ir.hpp
-	include/elna/parser.hpp
 )
-target_include_directories(elna PRIVATE include)

README

@@ -1,37 +0,0 @@
-# Elna programming language
-
-Elna compiles simple mathematical operations to machine code.
-The compiled program returns the result of the operation.
-
-## File extension
-
-.elna
-
-## Grammar PL/0
-
-program = block "." ;
-
-block = [ "const" ident "=" number {"," ident "=" number} ";"]
-        [ "var" ident {"," ident} ";"]
-        { "procedure" ident ";" block ";" } statement ;
-
-statement = [ ident ":=" expression | "call" ident 
-              | "?" ident | "!" expression 
-              | "begin" statement {";" statement } "end" 
-              | "if" condition "then" statement 
-              | "while" condition "do" statement ];
-
-condition = "odd" expression |
-            expression ("="|"#"|"<"|"<="|">"|">=") expression ;
-
-expression = [ "+"|"-"] term { ("+"|"-") term};
-
-term = factor {("*"|"/") factor};
-
-factor = ident | number | "(" expression ")";
-
-## Operations
-
-"!" - Write a line.
-"?" - Read user input.
-"odd" - The only function, returns whether a number is odd.

Rakefile

@@ -1,19 +0,0 @@
-require 'pathname'
-require 'rake/clean'
-require 'open3'
-
-DFLAGS = ['--warn-no-deprecated', '-L/usr/lib64/gcc-12']
-BINARY = 'build/bin/elna'
-SOURCES = FileList['source/**/*.d']
-
-directory 'build/riscv'
-
-CLEAN.include 'build'
-CLEAN.include '.dub'
-
-file BINARY => SOURCES do |t|
-  sh({ 'DFLAGS' => (DFLAGS * ' ') }, 'dub', 'build', '--compiler=gdc')
-end
-
-task default: 'build/riscv'
-task default: BINARY

TODO

@@ -1,23 +1,15 @@
-# Completion
+- After inserting autocompletion move the cursor to the end of the insertion.
-
-- Configure fzf to show only the current directory files
 - Support multiple selections for insertion in fzf.
+- Vi mode.
 - Don't hardcode fzf binary path.
-- Send the word under the cursor to fzf as initial input.
-- Home directory expansion.
-- Show files in the PATH if starting at the beginning of the prompt
-
-# Appearance
-
-- Add a bar with additional information under the prompt (edit_bar), like the hostname.
-- Show current time in the prompt.
-
-# Input
-
-- DEL handling.
-- Starting long running process and killing it with Ctrl-C kills the shell.
-
-# Other
-
 - Persist the history.
+- Send the word under the cursor to fzf as initial input.
 - Replace hard coded ANSI codes with constants or functions.
+- Show the hostname in the prompt.
+- Crash if the cd directory doesn't exist.
+- Home directory expansion.
+- Paste pastes only the first character.
+- When we read the key and an error occures how it should be handled?
+- Kitty protocol works with UTF8 code points for escape sequences with modifiers.
+  They can be wider than an unsigned char.
+- Add a bar with additional information under the prompt (edit_bar).

dub.json

@@ -1,11 +0,0 @@
-{
-	"dependencies": {
-		"tanya": "~>0.19.0"
-	},
-	"name": "elna",
-	"targetType": "executable",
-	"targetPath": "build/bin",
-	"mainSourceFile": "source/main.d",
-	"libs": ["elna", "stdc++"],
-	"lflags": ["-Lbuild"]
-}

include/elna/interactive.hpp

@@ -5,11 +5,10 @@
 #include <string>
 #include <optional>
 
+#include "elna/lexer.hpp"
 #include "elna/state.hpp"
 #include "elna/history.hpp"
 
-#define BOOST_PROCESS_USE_STD_FS
-
 namespace elna
 {
     /**
@@ -43,14 +42,15 @@ namespace elna
      * \param line The command and arguments.
      * \return Whether the input shoud continued (no exit requested).
      */
-    bool execute(const std::string& line);
+    bool execute(const std::vector<token>& line);
 
     /**
      * Runs the binary specified in its argument.
      *
      * \param program Program name in PATH.
+     * \param arguments Command arguments.
      */
-    void launch(const std::string& program);
+    void launch(const std::string& program, const std::vector<std::string>& arguments);
 
     /**
      * Enables the raw mode.
@@ -74,16 +74,7 @@ namespace elna
     /**
      * Calls autocompletion.
      *
-     * \param User input.
-     * \param Cursor position in the user input.
      * \return Selected item.
      */
-    std::string complete(const std::string& input, const std::size_t position);
+    std::string complete();
-
-    /**
-     * Prints the message from the exception.
-     *
-     * \param exception The exception to print.
-     */
-    void print_exception(const std::exception& exception);
 }

include/elna/ir.hpp

@@ -1,95 +0,0 @@
-#pragma once
-
-#include "elna/parser.hpp"
-#include <cstddef>
-#include <cstdint>
-
-namespace elna::ir
-{
-    class Node;
-    class Definition;
-    class Operand;
-    class BinaryExpression;
-    class Variable;
-    class VariableDeclaration;
-    class Number;
-
-    struct IRVisitor
-    {
-        virtual void visit(Node *) = 0;
-        virtual void visit(Definition *) = 0;
-        virtual void visit(Operand *) = 0;
-        virtual void visit(BinaryExpression *) = 0;
-        virtual void visit(Variable *) = 0;
-        virtual void visit(Number *) = 0;
-    };
-
-    /**
-     * AST node.
-     */
-    class Node
-    {
-    public:
-        virtual void accept(IRVisitor *) = 0;
-    };
-
-    /**
-     * Definition.
-     */
-    class Definition : public Node
-    {
-    public:
-        BinaryExpression **statements;
-        std::size_t statementsLength;
-        Operand *result;
-
-        virtual void accept(IRVisitor *visitor) override;
-    };
-
-    class Statement : public Node
-    {
-    };
-
-    class Operand : public Node
-    {
-    public:
-        virtual void accept(IRVisitor *visitor) override;
-    };
-
-    class Number : public Operand
-    {
-    public:
-        std::int32_t value;
-
-        virtual void accept(IRVisitor *visitor) override;
-    };
-
-    class Variable : public Operand
-    {
-    public:
-        std::size_t counter;
-
-        virtual void accept(IRVisitor *visitor) override;
-    };
-
-    class BinaryExpression : public Statement
-    {
-    public:
-        Operand *lhs, *rhs;
-        BinaryOperator _operator;
-
-        BinaryExpression(Operand *lhs, Operand *rhs, BinaryOperator _operator);
-
-        virtual void accept(IRVisitor *visitor) override;
-    };
-
-    class BangExpression : public Statement
-    {
-        Operand *operand;
-
-    public:
-        BangExpression(Operand *operand);
-
-        virtual void accept(IRVisitor *visitor) override;
-    };
-}

include/elna/lexer.hpp

@@ -16,8 +16,7 @@ namespace elna
             std::string::const_iterator m_buffer;
             Position m_position;
 
-            const_iterator(std::string::const_iterator buffer,
+            const_iterator(std::string::const_iterator buffer, const Position& position);
-                    const Position position = Position());
 
         public:
             using iterator_category = std::forward_iterator_tag;
@@ -43,61 +42,38 @@ namespace elna
         const_iterator end() const;
 
     private:
-        const std::string m_buffer;
+        const std::string& m_buffer;
     };
 
     /**
      * Union type representing a single token.
      */
-    struct Token
+    struct token
     {
         /**
          * Token type.
          */
-        enum Type : std::uint16_t
+        enum class type
         {
-            TOKEN_NUMBER = 0,
+            word,
-            TOKEN_OPERATOR = 1,
-            TOKEN_LET = 2,
-            TOKEN_IDENTIFIER = 3,
-            TOKEN_EQUALS = 4,
-            TOKEN_VAR = 5,
-            TOKEN_SEMICOLON = 6,
-            TOKEN_LEFT_PAREN = 7,
-            TOKEN_RIGHT_PAREN = 8,
-            TOKEN_BANG = 9,
-            TOKEN_DOT = 10,
-            TOKEN_COMMA = 11,
         };
 
+
         /**
          * Type of the token value.
          */
-        union Value
+        using value = std::string;
-        {
-            std::int32_t number;
-            const char *identifier;
-        };
 
-        Token(Type of, Position position);
+        token(const type of, source::const_iterator begin, source::const_iterator end);
-        Token(Type of, std::int32_t value, Position position);
-        Token(Type of, const char *value, Position position);
-        Token(const Token& that);
-        Token(Token&& that);
-        ~Token();
 
-        Token& operator=(const Token& that);
+        type of() const noexcept;
-        Token& operator=(Token&& that);
+        const value& identifier() const noexcept;
-
-        Type of() const noexcept;
-        const char *identifier() const noexcept;
-        std::int32_t number() const noexcept;
         const Position& position() const noexcept;
 
     private:
-        Type m_type;
+        std::string m_value;
-        Value m_value;
         Position m_position;
+        type m_type;
     };
 
     /**
@@ -105,5 +81,5 @@ namespace elna
      *
      * \return Tokens or error.
      */
-    Token *lex(const char *buffer, CompileError *compile_error, std::size_t *length);
+    result<std::vector<token>> lex(const std::string& buffer);
 }

include/elna/parser.hpp

@@ -1,10 +0,0 @@
-#pragma once
-
-namespace elna
-{
-    enum class BinaryOperator
-    {
-        sum,
-        subtraction
-    };
-}

include/elna/result.hpp

@@ -23,18 +23,18 @@ namespace elna
     struct CompileError
     {
     private:
-        char const *message;
+        char const *message_;
-        Position position;
+        Position position_;
 
     public:
         /**
          * @param message Error text.
          * @param position Error position in the source text.
          */
-        CompileError(char const *message, const Position position) noexcept;
+        CompileError(char const *message, Position position) noexcept;
 
         /// Error text.
-        const char *what() const noexcept;
+        char const *message() const noexcept;
 
         /// Error line in the source text.
         std::size_t line() const noexcept;
@@ -45,18 +45,4 @@ namespace elna
 
     template<typename T>
     using result = boost::outcome_v2::result<T, CompileError>;
-
-    enum class Target
-    {
-        text,
-        high20,
-        lower12i
-    };
-
-    struct Reference
-    {
-        const char* name;
-        size_t offset;
-        Target target;
-    };
 }

include/elna/riscv.hpp

@@ -1,148 +0,0 @@
-#pragma once
-
-#include <cstdint>
-#include "elna/ir.hpp"
-#include "elna/result.hpp"
-
-namespace elna
-{
-    enum class XRegister : std::uint8_t
-    {
-        zero = 0,
-        ra = 1,
-        sp = 2,
-        gp = 3,
-        tp = 4,
-        t0 = 5,
-        t1 = 6,
-        t2 = 7,
-        s0 = 8,
-        s1 = 9,
-        a0 = 10,
-        a1 = 11,
-        a2 = 12,
-        a3 = 13,
-        a4 = 14,
-        a5 = 15,
-        a6 = 16,
-        a7 = 17,
-        s2 = 18,
-        s3 = 19,
-        s4 = 20,
-        s5 = 21,
-        s6 = 22,
-        s7 = 23,
-        s8 = 24,
-        s9 = 25,
-        s10 = 26,
-        s11 = 27,
-        t3 = 28,
-        t4 = 29,
-        t5 = 30,
-        t6 = 31,
-    };
-
-    enum class Funct3 : std::uint8_t
-    {
-        addi = 0b000,
-        slti = 0b001,
-        sltiu = 0b011,
-        andi = 0b111,
-        ori = 0b110,
-        xori = 0b100,
-        slli = 0b000,
-        srli = 0b101,
-        srai = 0b101,
-        add = 0b000,
-        slt = 0b010,
-        sltu = 0b011,
-        _and = 0b111,
-        _or = 0b110,
-        _xor = 0b100,
-        sll = 0b001,
-        srl = 0b101,
-        sub = 0b000,
-        sra = 0b101,
-        beq = 0b000,
-        bne = 0b001,
-        blt = 0b100,
-        bltu = 0b110,
-        bge = 0b101,
-        bgeu = 0b111,
-        fence = 0b000,
-        fenceI = 0b001,
-        csrrw = 0b001,
-        csrrs = 0b010,
-        csrrc = 0b011,
-        csrrwi = 0b101,
-        csrrsi = 0b110,
-        csrrci = 0b111,
-        priv = 0b000,
-        sb = 0b000,
-        sh = 0b001,
-        sw = 0b010,
-        lb = 0b000,
-        lh = 0b001,
-        lw = 0b010,
-        lbu = 0b100,
-        lhu = 0b101,
-        jalr = 0b000,
-    };
-
-    enum class Funct12 : std::uint8_t
-    {
-        ecall = 0b000000000000,
-        ebreak = 0b000000000001,
-    };
-
-    enum class Funct7 : std::uint8_t
-    {
-        none = 0,
-        sub = 0b0100000
-    };
-
-    enum class BaseOpcode : std::uint8_t
-    {
-        opImm = 0b0010011,
-        lui = 0b0110111,
-        auipc = 0b0010111,
-        op = 0b0110011,
-        jal = 0b1101111,
-        jalr = 0b1100111,
-        branch = 0b1100011,
-        load = 0b0000011,
-        store = 0b0100011,
-        miscMem = 0b0001111,
-        system = 0b1110011,
-    };
-
-    struct Instruction
-    {
-        Instruction(BaseOpcode opcode);
-
-        Instruction& i(XRegister rd, Funct3 funct3, XRegister rs1, std::uint32_t immediate);
-        Instruction& s(std::uint32_t imm1, Funct3 funct3, XRegister rs1, XRegister rs2);
-        Instruction& r(XRegister rd, Funct3 funct3, XRegister rs1, XRegister rs2, Funct7 funct7 = Funct7::none);
-        Instruction& u(XRegister rd, std::uint32_t imm);
-        std::uint8_t *encode();
-
-    private:
-        std::uint32_t instruction{ 0 };
-    };
-
-    class RiscVVisitor : public ir::IRVisitor
-    {
-        Instruction *instructions;
-        std::size_t instructionsLength;
-        bool registerInUse;
-        std::uint32_t variableCounter = 1;
-        Reference references[3];
-
-        virtual void visit(ir::Node *) override;
-        virtual void visit(ir::Definition *definition) override;
-        virtual void visit(ir::Operand *operand) override;
-        virtual void visit(ir::Variable *variable) override;
-        virtual void visit(ir::Number *number) override;
-        virtual void visit(ir::BinaryExpression *expression) override;
-    };
-}

include/elna/state.hpp

@@ -38,28 +38,30 @@ namespace elna
         num_lock = 0b10000000, ///< 128
     };
 
-    struct key
+    class key
     {
-        using char_t = std::uint32_t;
+        std::variant<special_key, unsigned char> store;
+        std::uint8_t modifiers;
 
+    public:
         key();
-        explicit key(const char_t c, const std::uint8_t modifiers = 0);
+        explicit key(const unsigned char c, const std::uint8_t modifiers = 0);
-        explicit key(const char_t c, const modifier modifiers);
+        explicit key(const unsigned char c, const modifier modifiers);
         explicit key(const special_key control, const std::uint8_t modifiers = 0);
         explicit key(const special_key control, const modifier modifiers);
 
-        bool operator==(const char_t c) const;
+        bool operator==(const unsigned char c) const;
-        friend bool operator==(const char_t c, const key& that);
+        friend bool operator==(const unsigned char c, const key& that);
         bool operator==(const special_key control) const;
         friend bool operator==(const special_key control, const key& that);
         bool operator==(const key& that) const;
-        bool operator!=(const char_t c) const;
+        bool operator!=(const unsigned char c) const;
-        friend bool operator!=(const char_t c, const key& that);
+        friend bool operator!=(const unsigned char c, const key& that);
         bool operator!=(const special_key control) const;
         friend bool operator!=(const special_key control, const key& that);
         bool operator!=(const key& that) const;
 
-        char_t character() const;
+        unsigned char character() const;
         special_key control() const;
         bool modified(const std::uint8_t modifiers) const noexcept;
         bool modified(const modifier modifiers) const noexcept;
@@ -67,10 +69,6 @@ namespace elna
         bool is_character() const noexcept;
         bool is_control() const noexcept;
         bool empty() const noexcept;
-
-    private:
-        std::variant<special_key, char_t> store;
-        std::uint8_t modifiers;
     };
 
     /**
@@ -145,20 +143,12 @@ namespace elna
          */
         std::size_t absolute_position() const noexcept;
 
-        /**
-         * Cursor position relative to the start of the user input.
-         *
-         * \returns Cursor position.
-         */
-        std::size_t relative_position() const noexcept;
-
         /**
          * Inserts text at cursor position.
          *
          * \param text Text to insert.
          */
         void insert(const std::string& text);
-        void insert(const key::char_t text);
 
         /**
          * Replaces the user input with the given string.

shell/history.cpp

@@ -9,8 +9,8 @@ namespace elna
 
     void editor_history::push(const std::string& entry)
     {
-        commands.push_back(entry);
+        commands.push_front(entry);
-        current_pointer = commands.cend();
+        current_pointer = commands.cbegin();
     }
 
     void editor_history::clear()
@@ -46,9 +46,4 @@ namespace elna
     {
         return this->commands.cend();
     }
-
-    editor_history::const_iterator editor_history::current() const noexcept
-    {
-        return this->current_pointer;
-    }
 }

shell/interactive.cpp

@@ -1,10 +1,9 @@
-#include "elna/interactive.hpp"
-
-#include <boost/algorithm/string/predicate.hpp>
 #include <boost/process.hpp>
 #include <termios.h>
 #include <filesystem>
 
+#include "elna/interactive.hpp"
+
 namespace elna
 {
     static termios original_termios;
@@ -40,8 +39,9 @@ namespace elna
                 break;
             }
             history.push(line.value().command_line());
+            auto tokens = lex(line.value().command_line());
 
-            if (!execute(line.value().command_line()))
+            if (!execute(tokens.assume_value()))
             {
                 break;
             }
@@ -53,7 +53,6 @@ namespace elna
     {
         editor_state state;
         std::string buffer;
-        std::string saved;
 
         state.draw(std::back_inserter(buffer));
         write(STDOUT_FILENO, buffer.data(), buffer.size());
@@ -82,7 +81,7 @@ namespace elna
                     break;
                 case action::complete:
                     write(STDOUT_FILENO, "\x1b[1E\x1b[2K", 8);
-                    state.insert(complete(state.command_line(), state.relative_position()));
+                    state.insert(complete());
                     write(STDOUT_FILENO, "\x1b[1A", 4);
                     state.draw(std::back_inserter(buffer));
                     write(STDOUT_FILENO, buffer.data(), buffer.size());
@@ -105,26 +104,18 @@ namespace elna
 
                     if (pressed_key == key(special_key::arrow_up, modifier::ctrl))
                     {
-                        if (history.current() == history.cend())
+                        history_iterator = history.next();
-                        {
-                            saved = state.command_line();
-                        }
-                        history_iterator = history.prev();
                     }
                     else if (pressed_key == key(special_key::arrow_down, modifier::ctrl))
                     {
-                        history_iterator = history.next();
+                        history_iterator = history.prev();
-                        if (history_iterator == history.cend())
-                        {
-                            state.load(saved);
-                        }
                     }
                     if (history_iterator != history.cend())
                     {
                         state.load(*history_iterator);
+                        state.draw(std::back_inserter(buffer));
+                        write(STDOUT_FILENO, buffer.data(), buffer.size());
                     }
-                    state.draw(std::back_inserter(buffer));
-                    write(STDOUT_FILENO, buffer.data(), buffer.size());
                     break;
             }
         }
@@ -146,7 +137,7 @@ namespace elna
         {
             return key();
         }
-        auto [number, last_char] = read_number<key::char_t>();
+        auto [number, last_char] = read_number<unsigned char>();
         std::uint8_t modifiers{ 0 };
 
         if (last_char == ';')
@@ -194,51 +185,35 @@ namespace elna
         return key();
     }
 
-    void print_exception(const std::exception& exception)
+    bool execute(const std::vector<token>& tokens)
     {
-        std::string message{ exception.what()  };
+        if (tokens.empty())
-        message += "\r\n";
-        write(STDERR_FILENO, message.data(), message.size());
-    }
-
-    bool execute(const std::string& line)
-    {
-        if (line.empty())
         {
             return true;
         }
-        if (line == "exit")
+        std::string program = tokens.front().identifier();
+        if (program == "exit")
         {
             return false;
         }
-        else if (boost::starts_with(line, "cd "))
+        else if (program == "cd")
         {
-            try
+            std::filesystem::current_path(tokens[1].identifier());
-            {
-                std::filesystem::current_path(line.substr(strlen("cd ")));
-            }
-            catch (const std::filesystem::filesystem_error& exception)
-            {
-                print_exception(exception);
-            }
 
             return true;
         }
-        launch(line);
+        std::vector<std::string> arguments;
+        for (auto argument = tokens.cbegin() + 1; argument != std::cend(tokens); ++argument)
+        {
+            arguments.push_back(argument->identifier());
+        }
+        launch(program, arguments);
         return true;
     }
 
-    void launch(const std::string& program)
+    void launch(const std::string& program, const std::vector<std::string>& arguments)
     {
-        try
+        boost::process::system(boost::process::search_path(program), arguments);
-        {
-            boost::process::system(program);
-        }
-        catch (const boost::process::process_error& exception)
-        {
-            print_exception(exception);
-        }
-        enable_raw_mode();
     }
 
     bool enable_raw_mode()
@@ -265,17 +240,10 @@ namespace elna
         tcsetattr(STDIN_FILENO, TCSAFLUSH, &original_termios);
     }
 
-    std::string complete(const std::string& input, const std::size_t position)
+    std::string complete()
     {
-        std::filesystem::path program = boost::process::search_path("fzf");
-
-        if (program.empty())
-        {
-            return "";
-        }
         boost::process::ipstream output;
-        boost::process::system(program,
+        boost::process::system("/usr/bin/fzf", "--height=10", "--layout=reverse",
-                "--height=10", "--layout=reverse", "-1", "--no-multi",
                 boost::process::std_out > output);
 
         std::string selections;

shell/lexer.cpp

@@ -0,0 +1,124 @@
+#include "elna/lexer.hpp"
+
+namespace elna
+{
+    source::source(const std::string& buffer)
+        : m_buffer(buffer)
+    {
+    }
+
+    source::const_iterator source::begin() const
+    {
+        return source::const_iterator(std::cbegin(m_buffer), Position());
+    }
+
+    source::const_iterator source::end() const
+    {
+        Position end_position{ 0, 0 };
+
+        return source::const_iterator(std::cend(m_buffer), end_position);
+    }
+
+    source::const_iterator::const_iterator(std::string::const_iterator buffer, const Position& start_position)
+        : m_buffer(buffer), m_position(start_position)
+    {
+    }
+
+    const Position& source::const_iterator::position() const noexcept
+    {
+        return this->m_position;
+    }
+
+    source::const_iterator::reference source::const_iterator::operator*() const noexcept
+    {
+        return *m_buffer;
+    }
+
+    source::const_iterator::pointer source::const_iterator::operator->() const noexcept
+    {
+        return m_buffer.base();
+    }
+
+    source::const_iterator& source::const_iterator::operator++()
+    {
+        if (*this->m_buffer == '\n')
+        {
+            this->m_position.column = 1;
+            ++this->m_position.line;
+        }
+        else
+        {
+            ++this->m_position.column;
+        }
+        std::advance(this->m_buffer, 1);
+
+        return *this;
+    }
+
+    source::const_iterator& source::const_iterator::operator++(int)
+    {
+        auto tmp = *this;
+        ++(*this);
+        return *this;
+    }
+
+    bool source::const_iterator::operator==(const source::const_iterator& that) const noexcept
+    {
+        return this->m_buffer == that.m_buffer;
+    }
+
+    bool source::const_iterator::operator!=(const source::const_iterator& that) const noexcept
+    {
+        return !(*this == that);
+    }
+
+    token::token(const type of, source::const_iterator begin, source::const_iterator end)
+        : m_type(of), m_value(begin, end)
+    {
+    }
+
+    token::type token::of() const noexcept
+    {
+        return m_type;
+    }
+
+    const token::value& token::identifier() const noexcept
+    {
+        return m_value;
+    }
+
+    const Position& token::position() const noexcept
+    {
+        return m_position;
+    }
+
+    result<std::vector<token>> lex(const std::string& buffer)
+    {
+        std::vector<token> tokens;
+        source input{ buffer };
+
+        for (auto iterator = input.begin(); iterator != input.end();)
+        {
+            if (*iterator == ' ' || *iterator == '\n')
+            {
+            }
+            else if (std::isgraph(*iterator))
+            {
+                auto current_position = iterator;
+                do
+                {
+                    ++current_position;
+                }
+                while (current_position != input.end() && std::isgraph(*current_position));
+                token new_token{ token::type::word, iterator, current_position };
+
+                tokens.push_back(new_token);
+                iterator = current_position;
+                continue;
+            }
+            ++iterator;
+        }
+
+        return tokens;
+    }
+}

shell/result.cpp

@@ -0,0 +1,25 @@
+#include "elna/result.hpp"
+
+namespace elna
+{
+    CompileError::CompileError(char const *message, Position position) noexcept
+    {
+        this->message_ = message;
+        this->position_ = position;
+    }
+
+    char const *CompileError::message() const noexcept
+    {
+        return this->message_;
+    }
+
+    std::size_t CompileError::line() const noexcept
+    {
+        return this->position_.line;
+    }
+
+    std::size_t CompileError::column() const noexcept
+    {
+        return this->position_.column;
+    }
+}

shell/state.cpp

@@ -1,6 +1,3 @@
-#include <algorithm>
-#include <boost/endian.hpp>
-
 #include "elna/state.hpp"
 
 namespace elna
@@ -15,16 +12,16 @@ namespace elna
     }
 
     key::key()
-        : store(0x1bu)
+        : store(static_cast<unsigned char>(0x1b))
     {
     }
 
-    key::key(const char_t c, const std::uint8_t modifiers)
+    key::key(const unsigned char c, const std::uint8_t modifiers)
         : store(c), modifiers(modifiers == 0 ? 0 : modifiers - 1)
     {
     }
 
-    key::key(const char_t c, const modifier modifiers)
+    key::key(const unsigned char c, const modifier modifiers)
         : store(c), modifiers(static_cast<uint8_t>(modifiers))
     {
     }
@@ -39,9 +36,9 @@ namespace elna
     {
     }
 
-    key::char_t key::character() const
+    unsigned char key::character() const
     {
-        return std::get<char_t>(this->store);
+        return std::get<unsigned char>(this->store);
     }
 
     special_key key::control() const
@@ -59,10 +56,10 @@ namespace elna
         return this->modifiers == static_cast<std::uint8_t>(modifiers);
     }
 
-    bool key::operator==(const char_t c) const
+    bool key::operator==(const unsigned char c) const
     {
-        return std::holds_alternative<char_t>(this->store)
+        return std::holds_alternative<unsigned char>(this->store)
-            && std::get<char_t>(this->store) == c;
+            && std::get<unsigned char>(this->store) == c;
     }
 
     bool key::operator==(const special_key control) const
@@ -76,7 +73,7 @@ namespace elna
         return this->store == that.store;
     }
 
-    bool key::operator!=(const char_t c) const
+    bool key::operator!=(const unsigned char c) const
     {
         return !(*this == c);
     }
@@ -93,7 +90,7 @@ namespace elna
 
     bool key::is_character() const noexcept
     {
-        return std::holds_alternative<char_t>(this->store);
+        return std::holds_alternative<unsigned char>(this->store);
     }
 
     bool key::is_control() const noexcept
@@ -134,7 +131,6 @@ namespace elna
     void editor_state::load(const std::string& text)
     {
         this->input = text;
-        this->position = this->input.size() + 1;
     }
 
     const std::string& editor_state::command_line() const noexcept
@@ -147,36 +143,9 @@ namespace elna
         return this->prompt.size() + this->position;
     }
 
-    std::size_t editor_state::relative_position() const noexcept
-    {
-        return this->position;
-    }
-
     void editor_state::insert(const std::string& text)
     {
-        this->input.insert(this->position - 1, text);
+        this->input.insert(std::end(this->input), std::cbegin(text), std::cend(text));
-        this->position += text.size();
-    }
-
-    void editor_state::insert(const key::char_t text)
-    {
-        if (text == 0u)
-        {
-            this->input.insert(this->position - 1, '\0', 1);
-            ++this->position;
-            return;
-        }
-        key::char_t buffer = boost::endian::native_to_big<key::char_t>(text);
-
-        const char *begin = reinterpret_cast<char *>(&buffer);
-        const char *end = begin + sizeof(key::char_t);
-        const char *significant = std::find_if(begin, end,
-                [](const char byte) {
-                    return byte != 0;
-                });
-
-        this->input.insert(this->position - 1, significant, end - significant);
-        this->position += end - significant;
     }
 
     action editor_state::process_keypress(const key& press)
@@ -233,21 +202,12 @@ namespace elna
                         this->input.erase(this->position - 1, 1);
                     }
                     return action::redraw;
-                case 9: // Tab.
-                    return action::complete;
                 case '\r':
                     return action::finalize;
                 default:
-                    if (this->position - 1 < input.size())
+                    ++this->position;
-                    {
+                    this->input.push_back(press.character());
-                        insert(press.character());
+                    return action::write;
-                        return action::redraw;
-                    }
-                    else
-                    {
-                        insert(press.character());
-                        return action::write;
-                    }
             }
         }
     }

source/elna/arguments.d

@@ -1,154 +0,0 @@
-/**
- * Argument parsing.
- */
-module elna.arguments;
-
-import std.algorithm;
-import std.range;
-import std.sumtype;
-
-struct ArgumentError
-{
-    enum Type
-    {
-        expectedOutputFile,
-        noInput,
-        superfluousArguments,
-    }
-
-    private Type type_;
-    private string argument_;
-
-    @property Type type() const @nogc nothrow pure @safe
-    {
-        return this.type_;
-    }
-
-    @property string argument() const @nogc nothrow pure @safe
-    {
-        return this.argument_;
-    }
-
-    void toString(OR)(OR range)
-    if (isOutputRage!OR)
-    {
-        final switch (Type)
-        {
-            case Type.expectedOutputFile:
-                put(range, "Expected an output filename after -o");
-                break;
-            case Type.noInput:
-                put(range, "No input files specified");
-                break;
-        }
-    }
-}
-
-/**
- * Supported compiler arguments.
- */
-struct Arguments
-{
-    private bool assembler_;
-    private string output_;
-    private string inFile_;
-
-    @property string inFile() @nogc nothrow pure @safe
-    {
-        return this.inFile_;
-    }
-
-    /**
-     * Returns: Whether to generate assembly instead of an object file.
-     */
-    @property bool assembler() const @nogc nothrow pure @safe
-    {
-        return this.assembler_;
-    }
-
-    /**
-     * Returns: Output file.
-     */
-    @property string output() const @nogc nothrow pure @safe
-    {
-        return this.output_;
-    }
-
-    /**
-     * Parse command line arguments.
-     *
-     * The first argument is expected to be the program name (and it is
-     * ignored).
-     *
-     * Params:
-     *   arguments = Command line arguments.
-     *
-     * Returns: Parsed arguments or an error.
-     */
-    static SumType!(ArgumentError, Arguments) parse(string[] arguments)
-    @nogc nothrow pure @safe
-    {
-        if (!arguments.empty)
-        {
-            arguments.popFront;
-        }
-        alias ReturnType = typeof(return);
-
-        return parseArguments(arguments).match!(
-            (Arguments parsed) {
-                if (parsed.inFile is null)
-                {
-                    return ReturnType(ArgumentError(ArgumentError.Type.noInput));
-                }
-                else if (!arguments.empty)
-                {
-                    return ReturnType(ArgumentError(
-                        ArgumentError.Type.superfluousArguments,
-                        arguments.front
-                    ));
-                }
-                return ReturnType(parsed);
-            },
-            (ArgumentError argumentError) => ReturnType(argumentError)
-        );
-    }
-
-    private static SumType!(ArgumentError, Arguments) parseArguments(ref string[] arguments)
-    @nogc nothrow pure @safe
-    {
-        Arguments parsed;
-
-        while (!arguments.empty)
-        {
-            if (arguments.front == "-s")
-            {
-                parsed.assembler_ = true;
-            }
-            else if (arguments.front == "-o")
-            {
-                if (arguments.empty)
-                {
-                    return typeof(return)(ArgumentError(
-                        ArgumentError.Type.expectedOutputFile,
-                        arguments.front
-                    ));
-                }
-                arguments.popFront;
-                parsed.output_ = arguments.front;
-            }
-            else if (arguments.front == "--")
-            {
-                arguments.popFront;
-                parsed.inFile_ = arguments.front;
-                arguments.popFront;
-                break;
-            }
-            else if (!arguments.front.startsWith("-"))
-            {
-                parsed.inFile_ = arguments.front;
-            }
-            arguments.popFront;
-        }
-        return typeof(return)(parsed);
-    }
-}

source/elna/backend.d

@@ -1,114 +0,0 @@
-module elna.backend;
-
-import core.stdc.stdio;
-import core.stdc.stdlib;
-import core.stdc.string;
-import elna.elf;
-import elna.ir;
-import elna.extended;
-import elna.riscv;
-import elna.lexer;
-import elna.parser;
-import elna.result;
-import std.algorithm;
-import std.sumtype;
-import std.typecons;
-import tanya.os.error;
-import tanya.container.array;
-import tanya.container.string;
-import tanya.memory.allocator;
-
-private char* readSource(string source) @nogc
-{
-    enum size_t bufferSize = 255;
-    auto sourceFilename = String(source);
-
-    return readFile(sourceFilename).match!(
-        (ErrorCode errorCode) {
-            perror(sourceFilename.toStringz);
-            return null;
-        },
-        (Array!ubyte contents) {
-            char* cString = cast(char*) malloc(contents.length + 1);
-            memcpy(cString, contents.get.ptr, contents.length);
-            cString[contents.length] = '\0';
-
-            return cString;
-        }
-    );
-}
-
-int generate(string inFile, ref String outputFilename) @nogc
-{
-    auto sourceText = readSource(inFile);
-    if (sourceText is null)
-    {
-        return 3;
-    }
-    CompileError compileError = void;
-    size_t tokensCount;
-    auto tokens = lex(sourceText, &compileError, &tokensCount);
-    free(sourceText);
-    if (tokens is null)
-    {
-        printf("%lu:%lu: %s\n", compileError.line, compileError.column, compileError.what);
-        return 1;
-    }
-    auto ast = parse(tokens[0 .. tokensCount]);
-    if (!ast.valid)
-    {
-        compileError = ast.error.get;
-        printf("%lu:%lu: %s\n", compileError.line, compileError.column, compileError.what);
-        return 2;
-    }
-    auto transformVisitor = cast(TransformVisitor) malloc(__traits(classInstanceSize, TransformVisitor));
-    (cast(void*) transformVisitor)[0 .. __traits(classInstanceSize, TransformVisitor)] = __traits(initSymbol, TransformVisitor)[];
-
-    auto ir = transformVisitor.visit(ast.result);
-
-    transformVisitor.__xdtor();
-    free(cast(void*) transformVisitor);
-
-    auto handle = File.open(outputFilename.toStringz, BitFlags!(File.Mode)(File.Mode.truncate));
-    if (!handle.valid)
-    {
-        return 1;
-    }
-    auto program = writeNext(ir);
-    auto elf = Elf!ELFCLASS32(move(handle));
-    auto readOnlyData = Array!ubyte(cast(const(ubyte)[]) "%d\n".ptr[0 .. 4]); // With \0.
-
-    elf.addReadOnlyData(String(".CL0"), readOnlyData);
-    elf.addCode(program.name, program.text);
-
-    elf.addExternSymbol(String("printf"));
-    foreach (ref reference; program.symbols)
-    {
-        elf.Rela relocationEntry = {
-            r_offset: cast(elf.Addr) reference.offset
-        };
-        elf.Rela relocationSub = {
-            r_offset: cast(elf.Addr) reference.offset,
-            r_info: R_RISCV_RELAX
-        };
-
-        final switch (reference.target)
-        {
-            case Target.text:
-                relocationEntry.r_info = R_RISCV_CALL;
-                break;
-            case Target.high20:
-                relocationEntry.r_info = R_RISCV_HI20;
-                break;
-            case Target.lower12i:
-                relocationEntry.r_info = R_RISCV_LO12_I;
-                break;
-        }
-
-        elf.relocate(String(reference.name[0 .. strlen(reference.name)]), relocationEntry, relocationSub);
-    }
-
-    elf.finish();
-
-    return 0;
-}

source/elna/extended.d

@@ -1,335 +0,0 @@
-/**
- * File I/O that can be moved into more generic library when and if finished.
- */
-module elna.extended;
-
-import core.stdc.errno;
-import core.stdc.stdio;
-import std.sumtype;
-import std.typecons;
-import tanya.os.error;
-import tanya.container.array;
-import tanya.container.string;
-
-/**
- * File handle abstraction.
- */
-struct File
-{
-    /// Plattform dependent file type.
-    alias Handle = FILE*;
-
-    /// Uninitialized file handle value.
-    enum Handle invalid = null;
-
-    /**
-     * Relative position.
-     */
-    enum Whence
-    {
-        /// Relative to the start of the file.
-        set = SEEK_SET,
-        /// Relative to the current cursor position.
-        currentt = SEEK_CUR,
-        /// Relative from the end of the file.
-        end = SEEK_END,
-    }
-
-    /**
-     * File open modes.
-     */
-    enum Mode
-    {
-        /// Open the file for reading.
-        read = 1 << 0,
-        /// Open the file for writing. The stream is positioned at the beginning
-        /// of the file.
-        write = 1 << 1,
-        /// Open the file for writing and remove its contents.
-        truncate = 1 << 2,
-        /// Open the file for writing. The stream is positioned at the end of
-        /// the file.
-        append = 1 << 3,
-    }
-
-    private enum Status
-    {
-        invalid,
-        owned,
-        borrowed,
-    }
-
-    private union Storage
-    {
-        Handle handle;
-        ErrorCode errorCode;
-    }
-    private Storage storage;
-    private Status status = Status.invalid;
-
-    @disable this(scope return ref File f);
-    @disable this();
-
-    /**
-     * Closes the file.
-     */
-    ~this() @nogc nothrow
-    {
-        if (this.status == Status.owned)
-        {
-            fclose(this.storage.handle);
-        }
-        this.storage.handle = invalid;
-        this.status = Status.invalid;
-    }
-
-    /**
-     * Construct the object with the given system handle. The won't be claused
-     * in the descructor if this constructor is used.
-     *
-     * Params:
-     *   handle = File handle to be wrapped by this structure.
-     */
-    this(Handle handle) @nogc nothrow pure @safe
-    {
-        this.storage.handle = handle;
-        this.status = Status.borrowed;
-    }
-
-    /**
-     * Returns: Plattform dependent file handle.
-     */
-    @property Handle handle() @nogc nothrow pure @trusted
-    {
-        return valid ? this.storage.handle : invalid;
-    }
-
-    /**
-     * Returns: An error code if an error has occurred.
-     */
-    @property ErrorCode errorCode() @nogc nothrow pure @safe
-    {
-        return valid ? ErrorCode() : this.storage.errorCode;
-    }
-
-    /**
-     * Returns: Whether a valid, opened file is represented.
-     */
-    @property bool valid() @nogc nothrow pure @safe
-    {
-        return this.status != Status.invalid;
-    }
-
-    /**
-     * Transfers the file into invalid state.
-     *
-     * Returns: The old file handle.
-     */
-    Handle reset() @nogc nothrow pure @safe
-    {
-        if (!valid)
-        {
-            return invalid;
-        }
-        auto oldHandle = handle;
-
-        this.status = Status.invalid;
-        this.storage.errorCode = ErrorCode();
-
-        return oldHandle;
-    }
-
-    /**
-     * Sets stream position in the file.
-     *
-     * Params:
-     *   offset = File offset.
-     *   whence = File position to add the offset to.
-     *
-     * Returns: Error code if any.
-     */
-    ErrorCode seek(size_t offset, Whence whence) @nogc nothrow
-    {
-        if (!valid)
-        {
-            return ErrorCode(ErrorCode.ErrorNo.badDescriptor);
-        }
-        if (fseek(this.storage.handle, offset, whence))
-        {
-            return ErrorCode(cast(ErrorCode.ErrorNo) errno);
-        }
-        return ErrorCode();
-    }
-
-    /**
-     * Returns: Current offset or an error.
-     */
-    SumType!(ErrorCode, size_t) tell() @nogc nothrow
-    {
-        if (!valid)
-        {
-            return typeof(return)(ErrorCode(ErrorCode.ErrorNo.badDescriptor));
-        }
-        auto result = ftell(this.storage.handle);
-
-        if (result < 0)
-        {
-            return typeof(return)(ErrorCode(cast(ErrorCode.ErrorNo) errno));
-        }
-        return typeof(return)(cast(size_t) result);
-    }
-
-    /**
-     * Params:
-     *   buffer = Destination buffer.
-     *
-     * Returns: Bytes read. $(D_PSYMBOL ErrorCode.ErrorNo.success) means that
-     *          while reading the file an unknown error has occurred.
-     */
-    SumType!(ErrorCode, size_t) read(ubyte[] buffer) @nogc nothrow
-    {
-        if (!valid)
-        {
-            return typeof(return)(ErrorCode(ErrorCode.ErrorNo.badDescriptor));
-        }
-        const bytesRead = fread(buffer.ptr, 1, buffer.length, this.storage.handle);
-        if (bytesRead == buffer.length || eof())
-        {
-            return typeof(return)(bytesRead);
-        }
-        return typeof(return)(ErrorCode());
-    }
-
-    /**
-     * Params:
-     *   buffer = Source buffer.
-     *
-     * Returns: Bytes written. $(D_PSYMBOL ErrorCode.ErrorNo.success) means that
-     *          while reading the file an unknown error has occurred.
-     */
-    SumType!(ErrorCode, size_t) write(const(ubyte)[] buffer) @nogc nothrow
-    {
-        if (!valid)
-        {
-            return typeof(return)(ErrorCode(ErrorCode.ErrorNo.badDescriptor));
-        }
-        const bytesWritten = fwrite(buffer.ptr, 1, buffer.length, this.storage.handle);
-        if (bytesWritten == buffer.length)
-        {
-            return typeof(return)(buffer.length);
-        }
-        return typeof(return)(ErrorCode());
-    }
-
-    /**
-     * Returns: EOF status of the file.
-     */
-    bool eof() @nogc nothrow
-    {
-        return valid && feof(this.storage.handle) != 0;
-    }
-
-    /**
-     * Constructs a file object that will be closed in the destructor.
-     *
-     * Params:
-     *   filename = The file to open.
-     *
-     * Returns: Opened file or an error.
-     */
-    static File open(const(char)* filename, BitFlags!Mode mode) @nogc nothrow
-    {
-        char[3] modeBuffer = "\0\0\0";
-
-        if (mode.truncate)
-        {
-            modeBuffer[0] = 'w';
-            if (mode.read)
-            {
-                modeBuffer[1] = '+';
-            }
-        }
-        else if (mode.append)
-        {
-            modeBuffer[0] = 'a';
-            if (mode.read)
-            {
-                modeBuffer[1] = '+';
-            }
-        }
-        else if (mode.read)
-        {
-            modeBuffer[0] = 'r';
-            if (mode.write)
-            {
-                modeBuffer[1] = '+';
-            }
-        }
-
-        auto newHandle = fopen(filename, modeBuffer.ptr);
-        auto newFile = File(newHandle);
-
-        if (newHandle is null)
-        {
-            newFile.status = Status.invalid;
-            newFile.storage.errorCode = ErrorCode(cast(ErrorCode.ErrorNo) errno);
-        }
-        else
-        {
-            if (mode == BitFlags!Mode(Mode.write))
-            {
-                rewind(newHandle);
-            }
-            newFile.status = Status.owned;
-        }
-
-        return newFile;
-    }
-}
-
-/**
- * Reads the whole file and returns its contents.
- *
- * Params:
- *   sourceFilename = Source filename.
- *
- * Returns: File contents or an error.
- *
- * See_Also: $(D_PSYMBOL File.read)
- */
-SumType!(ErrorCode, Array!ubyte) readFile(String sourceFilename) @nogc
-{
-    enum size_t bufferSize = 255;
-    auto sourceFile = File.open(sourceFilename.toStringz, BitFlags!(File.Mode)(File.Mode.read));
-
-    if (!sourceFile.valid)
-    {
-        return typeof(return)(sourceFile.errorCode);
-    }
-    Array!ubyte sourceText;
-    size_t totalRead;
-    size_t bytesRead;
-    do
-    {
-        sourceText.length = sourceText.length + bufferSize;
-        const readStatus = sourceFile
-            .read(sourceText[totalRead .. $].get)
-            .match!(
-                (ErrorCode errorCode) => nullable(errorCode),
-                (size_t bytesRead_) {
-                    bytesRead = bytesRead_;
-                    return Nullable!ErrorCode();
-                }
-            );
-        if (!readStatus.isNull)
-        {
-            return typeof(return)(readStatus.get);
-        }
-        totalRead += bytesRead;
-    }
-    while (bytesRead == bufferSize);
-
-    sourceText.length = totalRead;
-
-    return typeof(return)(sourceText);
-}

source/elna/ir.d

@@ -1,220 +0,0 @@
-module elna.ir;
-
-import core.stdc.stdlib;
-import parser = elna.parser;
-import tanya.container.array;
-import tanya.container.hashtable;
-import tanya.container.string;
-import tanya.memory.allocator;
-public import elna.parser : BinaryOperator;
-
-/**
- * Mapping between the parser and IR AST.
- */
-struct ASTMapping
-{
-    alias Node = .Node;
-    alias Definition = .Definition;
-    alias Statement = .Operand;
-    alias BangStatement = .Operand;
-    alias Block = .Definition;
-    alias Expression = .Operand;
-    alias Number = .Number;
-    alias Variable = .Number;
-    alias BinaryExpression = .Variable;
-
-}
-
-/**
- * IR visitor.
-*/
-extern(C++, "elna", "ir")
-abstract class IRVisitor
-{
-    abstract void visit(Node) @nogc;
-    abstract void visit(Definition) @nogc;
-    abstract void visit(Operand) @nogc;
-    abstract void visit(BinaryExpression) @nogc;
-    abstract void visit(Variable) @nogc;
-    abstract void visit(Number) @nogc;
-}
-
-/**
- * AST node.
- */
-extern(C++, "elna", "ir")
-abstract class Node
-{
-    abstract void accept(IRVisitor) @nogc;
-}
-
-/**
- * Definition.
- */
-extern(C++, "elna", "ir")
-class Definition : Node
-{
-    BinaryExpression* statements;
-    size_t statementsLength;
-    Operand result;
-
-    override void accept(IRVisitor visitor) @nogc;
-}
-
-extern(C++, "elna", "ir")
-abstract class Statement : Node
-{
-}
-
-extern(C++, "elna", "ir")
-abstract class Operand : Node
-{
-    override void accept(IRVisitor visitor) @nogc;
-}
-
-extern(C++, "elna", "ir")
-class Number : Operand
-{
-    int value;
-
-    override void accept(IRVisitor visitor) @nogc;
-}
-
-extern(C++, "elna", "ir")
-class Variable : Operand
-{
-    size_t counter;
-
-    override void accept(IRVisitor visitor) @nogc;
-}
-
-extern(C++, "elna", "ir")
-class BinaryExpression : Statement
-{
-    Operand lhs, rhs;
-    BinaryOperator operator;
-
-    this(Operand lhs, Operand rhs, BinaryOperator operator) @nogc;
-
-    override void accept(IRVisitor visitor) @nogc;
-}
-
-extern(C++, "elna", "ir")
-class BangExpression : Statement
-{
-    Operand operand;
-
-    this(Operand operand);
-
-    override void accept(IRVisitor visitor) @nogc;
-}
-
-final class TransformVisitor : parser.ParserVisitor!ASTMapping
-{
-    private HashTable!(String, int) constants;
-    private BinaryExpression* statements;
-    private size_t statementsLength;
-
-    ASTMapping.Node visit(parser.Node node) @nogc
-    {
-        assert(false, "Not implemented");
-    }
-
-    ASTMapping.Definition visit(parser.Definition definition) @nogc
-    {
-        assert(false, "Not implemented");
-    }
-
-    ASTMapping.BangStatement visit(parser.BangStatement statement) @nogc
-    {
-        return statement.expression.accept(this);
-    }
-
-    ASTMapping.Block visit(parser.Block block) @nogc
-    {
-        auto target = defaultAllocator.make!Definition;
-        this.constants = transformConstants(block.definitions);
-
-        target.result = block.statement.accept(this);
-        target.statements = this.statements;
-        target.statementsLength = this.statementsLength;
-
-        return target;
-    }
-
-    ASTMapping.Expression visit(parser.Expression expression) @nogc
-    {
-        if ((cast(parser.Number) expression) !is null)
-        {
-            return (cast(parser.Number) expression).accept(this);
-        }
-        if ((cast(parser.Variable) expression) !is null)
-        {
-            return (cast(parser.Variable) expression).accept(this);
-        }
-        else if ((cast(parser.BinaryExpression) expression) !is null)
-        {
-            return (cast(parser.BinaryExpression) expression).accept(this);
-        }
-        assert(false, "Invalid expression type");
-    }
-
-    ASTMapping.Number visit(parser.Number number) @nogc
-    {
-        auto numberExpression = defaultAllocator.make!Number;
-        numberExpression.value = number.value;
-
-        return numberExpression;
-    }
-
-    ASTMapping.Variable visit(parser.Variable variable) @nogc
-    {
-        auto numberExpression = defaultAllocator.make!Number;
-        numberExpression.value = this.constants[variable.identifier];
-
-        return numberExpression;
-    }
-
-    ASTMapping.BinaryExpression visit(parser.BinaryExpression binaryExpression) @nogc
-    {
-        auto target = defaultAllocator.make!BinaryExpression(
-            binaryExpression.lhs.accept(this),
-            binaryExpression.rhs.accept(this),
-            binaryExpression.operator
-        );
-        this.statements = cast(BinaryExpression*)
-            realloc(this.statements, (this.statementsLength + 1) * BinaryExpression.sizeof);
-        this.statements[this.statementsLength++] = target;
-
-        auto newVariable = defaultAllocator.make!Variable;
-        newVariable.counter = this.statementsLength;
-
-        return newVariable;
-    }
-
-    private Number transformNumber(parser.Number number) @nogc
-    {
-        return defaultAllocator.make!Number(number.value);
-    }
-
-    override Operand visit(parser.Statement statement) @nogc
-    {
-        if ((cast(parser.BangStatement) statement) !is null)
-        {
-            return (cast(parser.BangStatement) statement).accept(this);
-        }
-        assert(false, "Invalid statement type");
-    }
-
-    private HashTable!(String, int) transformConstants(ref Array!(parser.Definition) definitions) @nogc
-    {
-        typeof(return) constants;
-
-        foreach (definition; definitions[])
-        {
-            constants[definition.identifier] = definition.number.value;
-        }
-
-        return constants;
-    }
-}

source/elna/lexer.d

@@ -1,117 +0,0 @@
-module elna.lexer;
-
-import core.stdc.stdlib;
-import core.stdc.ctype;
-import core.stdc.string;
-import elna.result;
-import std.range;
-import tanya.container.array;
-import tanya.container.string;
-
-extern(C++, "elna")
-struct Token
-{
-    enum Type : ushort
-    {
-        number = 0,
-        operator = 1,
-        let = 2,
-        identifier = 3,
-        equals = 4,
-        var = 5,
-        semicolon = 6,
-        leftParen = 7,
-        rightParen = 8,
-        bang = 9,
-        dot = 10,
-        comma = 11,
-    }
-
-    union Value
-    {
-        int number;
-        const(char)* identifier;
-    }
-
-    private Type type;
-    private Value value_;
-    private Position position_;
-
-    @disable this();
-
-    this(Type type, Position position) @nogc nothrow pure @safe;
-    this(Type type, int value, Position position) @nogc nothrow pure @trusted;
-    this(Type type, const(char)* value, Position position) @nogc nothrow;
-
-    /**
-     * Returns: Expected token type.
-     */
-    Type of() const @nogc nothrow pure @safe;
-    const(char)* identifier() const @nogc nothrow pure;
-    int number() const @nogc nothrow pure;
-
-    /**
-     * Returns: The token position in the source text.
-     */
-    @property const(Position) position() const @nogc nothrow pure @safe;
-}
-
-/**
- * Range over the source text that keeps track of the current position.
- */
-struct Source
-{
-    const(char)* buffer;
-    Position position;
-
-    this(const(char)* buffer) @nogc nothrow pure @safe
-    {
-        this.buffer = buffer;
-    }
-
-    @disable this();
-
-    bool empty() @nogc nothrow pure @safe
-    {
-        return this.buffer is null || this.buffer[0] == '\0';
-    }
-
-    char front() @nogc nothrow pure @safe
-    in (!empty)
-    {
-        return this.buffer[0];
-    }
-
-    void popFront() @nogc nothrow pure
-    in (!empty)
-    {
-        ++this.buffer;
-        ++this.position.column;
-    }
-
-    void breakLine() @nogc nothrow pure
-    in (!empty)
-    {
-        ++this.buffer;
-        ++this.position.line;
-        this.position.column = 1;
-    }
-
-    @property size_t length() const @nogc nothrow pure
-    {
-        return strlen(this.buffer);
-    }
-
-    char opIndex(size_t index) @nogc nothrow pure
-    {
-        return this.buffer[index];
-    }
-
-    const(char)[] opSlice(size_t i, size_t j) @nogc nothrow pure
-    {
-        return this.buffer[i .. j];
-    }
-}
-
-extern(C++, "elna")
-Token* lex(const(char)* buffer, CompileError* compileError, size_t* length) @nogc;

source/elna/parser.d

@@ -1,308 +0,0 @@
-module elna.parser;
-
-import core.stdc.string;
-import elna.lexer;
-import elna.result;
-import tanya.container.array;
-import tanya.container.string;
-import tanya.memory.allocator;
-import std.array;
-
-/**
- * Parser visitor.
- */
-interface ParserVisitor(Mapping)
-{
-    Mapping.Node visit(Node) @nogc;
-    Mapping.Definition visit(Definition) @nogc;
-    Mapping.Statement visit(Statement) @nogc;
-    Mapping.BangStatement visit(BangStatement) @nogc;
-    Mapping.Block visit(Block) @nogc;
-    Mapping.Expression visit(Expression) @nogc;
-    Mapping.Number visit(Number) @nogc;
-    Mapping.Variable visit(Variable) @nogc;
-    Mapping.BinaryExpression visit(BinaryExpression) @nogc;
-}
-
-/**
- * AST node.
- */
-abstract class Node
-{
-    Mapping.Node accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-/**
- * Constant definition.
- */
-class Definition : Node
-{
-    Number number;
-    String identifier;
-
-    Mapping.Definition accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-abstract class Statement : Node
-{
-    Mapping.Statement accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-class BangStatement : Statement
-{
-    Expression expression;
-
-    Mapping.BangStatement accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-class Block : Node
-{
-    Array!Definition definitions;
-    Statement statement;
-
-    Mapping.Block accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-abstract class Expression : Node
-{
-    Mapping.Expression accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-class Number : Expression
-{
-    int value;
-
-    Mapping.Number accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-class Variable : Expression
-{
-    String identifier;
-
-    Mapping.Variable accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-extern(C++, "elna")
-enum BinaryOperator
-{
-    sum,
-    subtraction
-}
-
-class BinaryExpression : Expression
-{
-    Expression lhs, rhs;
-    BinaryOperator operator;
-
-    this(Expression lhs, Expression rhs, String operator) @nogc
-    {
-        this.lhs = lhs;
-        this.rhs = rhs;
-        if (operator == "+")
-        {
-            this.operator = BinaryOperator.sum;
-        }
-        else if (operator == "-")
-        {
-            this.operator = BinaryOperator.subtraction;
-        }
-        else
-        {
-            assert(false, "Invalid binary operator");
-        }
-    }
-
-    Mapping.BinaryExpression accept(Mapping)(ParserVisitor!Mapping visitor) @nogc
-    {
-        return visitor.visit(this);
-    }
-}
-
-private Result!Expression parseFactor(ref Token[] tokens) @nogc
-in (!tokens.empty, "Expected factor, got end of stream")
-{
-    if (tokens.front.of() == Token.Type.identifier)
-    {
-        auto variable = defaultAllocator.make!Variable;
-        variable.identifier = tokens.front.identifier()[0 .. strlen(tokens.front.identifier())];
-        tokens.popFront;
-        return Result!Expression(variable);
-    }
-    else if (tokens.front.of() == Token.Type.number)
-    {
-        auto number = defaultAllocator.make!Number;
-        number.value = tokens.front.number();
-        tokens.popFront;
-        return Result!Expression(number);
-    }
-    else if (tokens.front.of() == Token.Type.leftParen)
-    {
-        tokens.popFront;
-
-        auto expression = parseExpression(tokens);
-
-        tokens.popFront;
-        return expression;
-    }
-    return Result!Expression("Expected a factor", tokens.front.position);
-}
-
-private Result!Expression parseTerm(ref Token[] tokens) @nogc
-{
-    return parseFactor(tokens);
-}
-
-private Result!Expression parseExpression(ref Token[] tokens) @nogc
-in (!tokens.empty, "Expected expression, got end of stream")
-{
-    auto term = parseTerm(tokens);
-    if (!term.valid || tokens.empty || tokens.front.of() != Token.Type.operator)
-    {
-        return term;
-    }
-    auto operator = String(tokens.front.identifier()[0 .. strlen(tokens.front.identifier())]);
-    tokens.popFront;
-
-    auto expression = parseExpression(tokens);
-
-    if (expression.valid)
-    {
-        auto binaryExpression = defaultAllocator
-            .make!BinaryExpression(term.result, expression.result, operator);
-
-        return Result!Expression(binaryExpression);
-    }
-    else
-    {
-        return Result!Expression("Expected right-hand side to be an expression", tokens.front.position);
-    }
-}
-
-private Result!Definition parseDefinition(ref Token[] tokens) @nogc
-in (!tokens.empty, "Expected definition, got end of stream")
-{
-    auto definition = defaultAllocator.make!Definition;
-    definition.identifier = tokens.front.identifier()[0 .. strlen(tokens.front.identifier())]; // Copy.
-
-    tokens.popFront();
-    tokens.popFront(); // Skip the equals sign.
-
-    if (tokens.front.of() == Token.Type.number)
-    {
-        auto number = defaultAllocator.make!Number;
-        number.value = tokens.front.number();
-        definition.number = number;
-        tokens.popFront;
-        return Result!Definition(definition);
-    }
-    return Result!Definition("Expected a number", tokens.front.position);
-}
-
-private Result!Statement parseStatement(ref Token[] tokens) @nogc
-in (!tokens.empty, "Expected block, got end of stream")
-{
-    if (tokens.front.of() == Token.Type.bang)
-    {
-        tokens.popFront;
-        auto statement = defaultAllocator.make!BangStatement;
-        auto expression = parseExpression(tokens);
-        if (expression.valid)
-        {
-            statement.expression = expression.result;
-        }
-        else
-        {
-            return Result!Statement(expression.error.get);
-        }
-        return Result!Statement(statement);
-    }
-    return Result!Statement("Expected ! statement", tokens.front.position);
-}
-
-private Result!(Array!Definition) parseDefinitions(ref Token[] tokens) @nogc
-in (!tokens.empty, "Expected definition, got end of stream")
-{
-    tokens.popFront; // Skip const.
-
-    Array!Definition definitions;
-
-    while (!tokens.empty)
-    {
-        auto definition = parseDefinition(tokens);
-        if (!definition.valid)
-        {
-            return typeof(return)(definition.error.get);
-        }
-        definitions.insertBack(definition.result);
-        if (tokens.front.of() == Token.Type.semicolon)
-        {
-            break;
-        }
-        if (tokens.front.of() == Token.Type.comma)
-        {
-            tokens.popFront;
-        }
-    }
-
-    return typeof(return)(definitions);
-}
-
-private Result!Block parseBlock(ref Token[] tokens) @nogc
-in (!tokens.empty, "Expected block, got end of stream")
-{
-    auto block = defaultAllocator.make!Block;
-    if (tokens.front.of() == Token.Type.let)
-    {
-        auto constDefinitions = parseDefinitions(tokens);
-        if (constDefinitions.valid)
-        {
-            block.definitions = constDefinitions.result;
-        }
-        else
-        {
-            return Result!Block(constDefinitions.error.get);
-        }
-        tokens.popFront;
-    }
-    auto statement = parseStatement(tokens);
-    if (statement.valid)
-    {
-        block.statement = statement.result;
-    }
-    else
-    {
-        return Result!Block(statement.error.get);
-    }
-
-    return Result!Block(block);
-}
-
-Result!Block parse(Token[] tokenStream) @nogc
-{
-    auto tokens = tokenStream[];
-    return parseBlock(tokens);
-}

source/elna/result.d

@@ -1,98 +0,0 @@
-module elna.result;
-
-import std.typecons;
-import tanya.container.array;
-import tanya.container.string;
-
-/**
- * Position in the source text.
- */
-extern(C++, "elna")
-struct Position
-{
-    /// Line.
-    size_t line = 1;
-
-    /// Column.
-    size_t column = 1;
-}
-
-extern(C++, "elna")
-struct CompileError
-{
-    private const(char)* message_;
-
-    private Position position_;
-
-    @disable this();
-
-    /**
-     * Params:
-     *   message = Error text.
-     *   position = Error position in the source text.
-     */
-    this(const(char)* message, const Position position) @nogc nothrow pure @safe;
-
-    /// Error text.
-    @property const(char)* what() const @nogc nothrow pure @safe;
-
-    /// Error line in the source text.
-    @property size_t line() const @nogc nothrow pure @safe;
-
-    /// Error column in the source text.
-    @property size_t column() const @nogc nothrow pure @safe;
-}
-
-struct Result(T)
-{
-    Nullable!CompileError error;
-    T result;
-
-    this(T result)
-    {
-        this.result = result;
-        this.error = typeof(this.error).init;
-    }
-
-    this(const(char)* message, Position position)
-    {
-        this.result = T.init;
-        this.error = CompileError(message, position);
-    }
-
-    this(CompileError compileError)
-    {
-        this.result = null;
-        this.error = compileError;
-    }
-
-    @disable this();
-
-    @property bool valid() const
-    {
-        return error.isNull;
-    }
-}
-
-extern(C++, "elna")
-enum Target
-{
-    text,
-    high20,
-    lower12i
-}
-
-extern(C++, "elna")
-struct Reference
-{
-    const(char)* name;
-    size_t offset;
-    Target target;
-}
-
-struct Symbol
-{
-    String name;
-    Array!ubyte text;
-    Array!Reference symbols;
-}

source/elna/riscv.d

@@ -1,183 +0,0 @@
-module elna.riscv;
-
-import core.stdc.stdlib;
-import elna.ir;
-import elna.result;
-import tanya.container.array;
-import tanya.container.string;
-
-extern(C++, "elna")
-enum XRegister : ubyte
-{
-    zero = 0,
-    ra = 1,
-    sp = 2,
-    gp = 3,
-    tp = 4,
-    t0 = 5,
-    t1 = 6,
-    t2 = 7,
-    s0 = 8,
-    s1 = 9,
-    a0 = 10,
-    a1 = 11,
-    a2 = 12,
-    a3 = 13,
-    a4 = 14,
-    a5 = 15,
-    a6 = 16,
-    a7 = 17,
-    s2 = 18,
-    s3 = 19,
-    s4 = 20,
-    s5 = 21,
-    s6 = 22,
-    s7 = 23,
-    s8 = 24,
-    s9 = 25,
-    s10 = 26,
-    s11 = 27,
-    t3 = 28,
-    t4 = 29,
-    t5 = 30,
-    t6 = 31,
-}
-
-extern(C++, "elna")
-enum Funct3 : ubyte
-{
-    addi = 0b000,
-    slti = 0b001,
-    sltiu = 0b011,
-    andi = 0b111,
-    ori = 0b110,
-    xori = 0b100,
-    slli = 0b000,
-    srli = 0b101,
-    srai = 0b101,
-    add = 0b000,
-    slt = 0b010,
-    sltu = 0b011,
-    and = 0b111,
-    or = 0b110,
-    xor = 0b100,
-    sll = 0b001,
-    srl = 0b101,
-    sub = 0b000,
-    sra = 0b101,
-    beq = 0b000,
-    bne = 0b001,
-    blt = 0b100,
-    bltu = 0b110,
-    bge = 0b101,
-    bgeu = 0b111,
-    fence = 0b000,
-    fenceI = 0b001,
-    csrrw = 0b001,
-    csrrs = 0b010,
-    csrrc = 0b011,
-    csrrwi = 0b101,
-    csrrsi = 0b110,
-    csrrci = 0b111,
-    priv = 0b000,
-    sb = 0b000,
-    sh = 0b001,
-    sw = 0b010,
-    lb = 0b000,
-    lh = 0b001,
-    lw = 0b010,
-    lbu = 0b100,
-    lhu = 0b101,
-    jalr = 0b000,
-}
-
-extern(C++, "elna")
-enum Funct12 : ubyte
-{
-    ecall = 0b000000000000,
-    ebreak = 0b000000000001,
-}
-
-extern(C++, "elna")
-enum Funct7 : ubyte
-{
-    none = 0,
-    sub = 0b0100000
-}
-
-extern(C++, "elna")
-enum BaseOpcode : ubyte
-{
-    opImm = 0b0010011,
-    lui = 0b0110111,
-    auipc = 0b0010111,
-    op = 0b0110011,
-    jal = 0b1101111,
-    jalr = 0b1100111,
-    branch = 0b1100011,
-    load = 0b0000011,
-    store = 0b0100011,
-    miscMem = 0b0001111,
-    system = 0b1110011,
-}
-
-extern(C++, "elna")
-struct Instruction
-{
-    private uint instruction;
-
-    this(BaseOpcode opcode) @nogc;
-    @disable this();
-
-    ref Instruction i(XRegister rd, Funct3 funct3, XRegister rs1, uint immediate)
-    return scope @nogc;
-
-    ref Instruction s(uint imm1, Funct3 funct3, XRegister rs1, XRegister rs2)
-    return scope @nogc;
-
-    ref Instruction r(XRegister rd, Funct3 funct3, XRegister rs1, XRegister rs2, Funct7 funct7 = Funct7.none)
-    return scope @nogc;
-
-    ref Instruction u(XRegister rd, uint imm)
-    return scope @nogc;
-
-    ubyte* encode() return scope @nogc;
-}
-
-extern(C++, "elna")
-class RiscVVisitor : IRVisitor
-{
-    Instruction *instructions;
-    size_t instructionsLength;
-    bool registerInUse;
-    uint variableCounter = 1;
-    Reference[3] references;
-
-    override void visit(Node) @nogc;
-    override void visit(Definition definition) @nogc;
-    override void visit(Operand operand) @nogc;
-    override void visit(Variable variable) @nogc;
-    override void visit(Number number) @nogc;
-    override void visit(BinaryExpression expression) @nogc;
-}
-
-Symbol writeNext(Definition ast) @nogc
-{
-    Array!Instruction instructions;
-    auto visitor = cast(RiscVVisitor) malloc(__traits(classInstanceSize, RiscVVisitor));
-    (cast(void*) visitor)[0 .. __traits(classInstanceSize, RiscVVisitor)] = __traits(initSymbol, RiscVVisitor)[];
-    scope (exit)
-    {
-        free(cast(void*) visitor);
-    }
-    visitor.visit(ast);
-
-    auto program = Symbol(String("main"));
-
-    program.symbols = Array!Reference(visitor.references[]);
-    foreach (ref instruction; visitor.instructions[0 .. visitor.instructionsLength])
-    {
-        program.text.insertBack(instruction.encode[0 .. uint.sizeof]);
-    }
-    return program;
-}

source/ir.cpp

@@ -1,53 +0,0 @@
-#include "elna/ir.hpp"
-
-namespace elna::ir
-{
-    /**
-     * AST node.
-     */
-    void Node::accept(IRVisitor *)
-    {
-    }
-
-    void Definition::accept(IRVisitor *visitor)
-    {
-        visitor->visit(this);
-    }
-
-    void Operand::accept(IRVisitor *visitor)
-    {
-        visitor->visit(this);
-    }
-
-    void Number::accept(IRVisitor *visitor)
-    {
-        visitor->visit(this);
-    }
-
-    void Variable::accept(IRVisitor *visitor)
-    {
-        visitor->visit(this);
-    }
-
-    BinaryExpression::BinaryExpression(Operand *lhs, Operand *rhs, BinaryOperator _operator)
-    {
-        this->lhs = lhs;
-        this->rhs = rhs;
-        this->_operator = _operator;
-    }
-
-    void BinaryExpression::accept(IRVisitor *visitor)
-    {
-        visitor->visit(this);
-    }
-
-    BangExpression::BangExpression(Operand *operand)
-    {
-        this->operand = operand;
-    }
-
-    void BangExpression::accept(IRVisitor *visitor)
-    {
-        visitor->visit(this);
-    }
-}

source/lexer.cpp

@@ -1,270 +0,0 @@
-#include "elna/lexer.hpp"
-
-namespace elna
-{
-    source::source(const std::string& buffer)
-        : m_buffer(buffer)
-    {
-    }
-
-    source::const_iterator source::begin() const
-    {
-        return source::const_iterator(std::cbegin(m_buffer));
-    }
-
-    source::const_iterator source::end() const
-    {
-        Position end_position{ 0, 0 };
-
-        return source::const_iterator(std::cend(m_buffer), end_position);
-    }
-
-    source::const_iterator::const_iterator(std::string::const_iterator buffer,
-            const Position start_position)
-        : m_buffer(buffer), m_position(start_position)
-    {
-    }
-
-    const Position& source::const_iterator::position() const noexcept
-    {
-        return this->m_position;
-    }
-
-    source::const_iterator::reference source::const_iterator::operator*() const noexcept
-    {
-        return *m_buffer;
-    }
-
-    source::const_iterator::pointer source::const_iterator::operator->() const noexcept
-    {
-        return m_buffer.base();
-    }
-
-    source::const_iterator& source::const_iterator::operator++()
-    {
-        if (*this->m_buffer == '\n')
-        {
-            this->m_position.column = 1;
-            ++this->m_position.line;
-        }
-        else
-        {
-            ++this->m_position.column;
-        }
-        std::advance(this->m_buffer, 1);
-
-        return *this;
-    }
-
-    source::const_iterator& source::const_iterator::operator++(int)
-    {
-        auto tmp = *this;
-        ++(*this);
-        return *this;
-    }
-
-    bool source::const_iterator::operator==(const source::const_iterator& that) const noexcept
-    {
-        return this->m_buffer == that.m_buffer;
-    }
-
-    bool source::const_iterator::operator!=(const source::const_iterator& that) const noexcept
-    {
-        return !(*this == that);
-    }
-
-    Token::Token(const Type of, const char *value, Position position)
-        : m_type(of), m_position(position)
-    {
-        std::size_t value_length = strlen(value);
-        char *buffer = reinterpret_cast<char *>(malloc(value_length + 1));
-
-        std::memcpy(buffer, value, value_length);
-        buffer[value_length] = 0;
-
-        m_value.identifier = buffer;
-    }
-
-    Token::Token(const Type of, std::int32_t number, Position position)
-        : m_type(of), m_position(position)
-    {
-        m_value.number = number;
-    }
-
-    Token::Token(const Type of, Position position)
-        : m_type(of), m_position(position)
-    {
-    }
-
-    Token::Token(const Token& that)
-        : m_type(that.of()), m_position(that.position())
-    {
-        *this = that;
-    }
-
-    Token::Token(Token&& that)
-        : m_type(that.of()), m_position(that.position())
-    {
-        *this = std::move(that);
-    }
-
-    Token::~Token()
-    {
-        if (m_type == TOKEN_IDENTIFIER || m_type == TOKEN_OPERATOR)
-        {
-            std::free(const_cast<char*>(m_value.identifier));
-        }
-    }
-
-    Token& Token::operator=(const Token& that)
-    {
-        m_type = that.of();
-        m_position = that.position();
-        if (that.of() == TOKEN_IDENTIFIER || that.of() == TOKEN_OPERATOR)
-        {
-            std::size_t value_length = strlen(that.identifier());
-            char *buffer = reinterpret_cast<char *>(malloc(value_length + 1));
-
-            std::memcpy(buffer, that.identifier(), value_length);
-            buffer[value_length] = 0;
-
-            m_value.identifier = buffer;
-        }
-        else if (that.of() == TOKEN_NUMBER)
-        {
-            m_value.number = that.number();
-        }
-        return *this;
-    }
-
-    Token& Token::operator=(Token&& that)
-    {
-        m_type = that.of();
-        m_position = that.position();
-        if (that.of() == TOKEN_IDENTIFIER || that.of() == TOKEN_OPERATOR)
-        {
-            m_value.identifier = that.identifier();
-            that.m_value.identifier = nullptr;
-        }
-        else if (that.of() == TOKEN_NUMBER)
-        {
-            m_value.number = that.number();
-        }
-        return *this;
-    }
-
-    Token::Type Token::of() const noexcept
-    {
-        return m_type;
-    }
-
-    const char *Token::identifier() const noexcept
-    {
-        return m_value.identifier;
-    }
-
-    std::int32_t Token::number() const noexcept
-    {
-        return m_value.number;
-    }
-
-    const Position& Token::position() const noexcept
-    {
-        return m_position;
-    }
-
-    Token *lex(const char *buffer, CompileError *compile_error, std::size_t *length)
-    {
-        std::vector<Token> tokens;
-        source input{ buffer };
-
-        for (auto iterator = input.begin(); iterator != input.end();)
-        {
-            if (*iterator == ' ' || *iterator == '\n')
-            {
-            }
-            else if (std::isdigit(*iterator))
-            {
-                tokens.emplace_back(
-                        Token::TOKEN_NUMBER,
-                        static_cast<std::int32_t>(*iterator - '0'),
-                        iterator.position()
-                );
-            }
-            else if (*iterator == '=')
-            {
-                tokens.emplace_back(Token::TOKEN_EQUALS, iterator.position());
-            }
-            else if (*iterator == '(')
-            {
-                tokens.emplace_back(Token::TOKEN_LEFT_PAREN, iterator.position());
-            }
-            else if (*iterator == ')')
-            {
-                tokens.emplace_back(Token::TOKEN_RIGHT_PAREN, iterator.position());
-            }
-            else if (*iterator == ';')
-            {
-                tokens.emplace_back(Token::TOKEN_SEMICOLON, iterator.position());
-            }
-            else if (*iterator == ',')
-            {
-                tokens.emplace_back(Token::TOKEN_COMMA, iterator.position());
-            }
-            else if (*iterator == '!')
-            {
-                tokens.emplace_back(Token::TOKEN_BANG, iterator.position());
-            }
-            else if (*iterator == '.')
-            {
-                tokens.emplace_back(Token::TOKEN_DOT, iterator.position());
-            }
-            else if (std::isalpha(*iterator))
-            {
-                std::string word;
-                auto i = iterator;
-                while (i != input.end() && std::isalpha(*i))
-                {
-                    word.push_back(*i);
-                    ++i;
-                }
-                if (word == "const")
-                {
-                    tokens.emplace_back(Token::TOKEN_LET, iterator.position());
-                }
-                else if (word == "var")
-                {
-                    tokens.emplace_back(Token::TOKEN_VAR, iterator.position());
-                }
-                else
-                {
-                    tokens.emplace_back(Token::TOKEN_IDENTIFIER, word.c_str(), iterator.position());
-                }
-                iterator = i;
-                continue;
-            }
-            else if (*iterator == '+' || *iterator == '-')
-            {
-                std::string _operator{ *iterator };
-
-                tokens.emplace_back(Token::TOKEN_OPERATOR, _operator.c_str(), iterator.position());
-            }
-            else
-            {
-                *compile_error = CompileError("Unexpected next character", iterator.position());
-                return nullptr;
-            }
-            ++iterator;
-        }
-        Token *target = reinterpret_cast<Token *>(malloc(tokens.size() * sizeof(Token) + sizeof(Token)));
-        int i = 0;
-        for (auto& token : tokens)
-        {
-            target[i] = std::move(token);
-            ++i;
-        }
-        *length = i;
-
-        return target;
-    }
-}

source/main.d

@@ -1,33 +0,0 @@
-import elna.backend;
-import elna.ir;
-import elna.arguments;
-import std.path;
-import std.sumtype;
-import tanya.container.string;
-import tanya.memory.allocator;
-import tanya.memory.mmappool;
-
-int main(string[] args)
-{
-    defaultAllocator = MmapPool.instance;
-
-    return Arguments.parse(args).match!(
-        (ArgumentError argumentError) => 4,
-        (Arguments arguments) {
-            String outputFilename;
-            if (arguments.output is null)
-            {
-                outputFilename = arguments
-                    .inFile
-                    .baseName
-                    .withExtension("o");
-            }
-            else
-            {
-                outputFilename = String(arguments.output);
-            }
-
-            return generate(arguments.inFile, outputFilename);
-        }
-    );
-}

source/result.cpp

@@ -1,25 +0,0 @@
-#include "elna/result.hpp"
-
-namespace elna
-{
-    CompileError::CompileError(const char *message, const Position position) noexcept
-    {
-        this->message = message;
-        this->position = position;
-    }
-
-    char const *CompileError::what() const noexcept
-    {
-        return this->message;
-    }
-
-    std::size_t CompileError::line() const noexcept
-    {
-        return this->position.line;
-    }
-
-    std::size_t CompileError::column() const noexcept
-    {
-        return this->position.column;
-    }
-}

source/riscv.cpp

@@ -1,191 +0,0 @@
-#include "elna/parser.hpp"
-#include "elna/riscv.hpp"
-#include <type_traits>
-
-namespace elna
-{
-    Instruction::Instruction(BaseOpcode opcode)
-    {
-        this->instruction = static_cast<std::underlying_type<BaseOpcode>::type>(opcode);
-    }
-
-    Instruction& Instruction::i(XRegister rd, Funct3 funct3, XRegister rs1, std::uint32_t immediate)
-    {
-        this->instruction |= (static_cast<std::underlying_type<XRegister>::type>(rd) << 7)
-            | (static_cast<std::underlying_type<Funct3>::type>(funct3) << 12)
-            | (static_cast<std::underlying_type<XRegister>::type>(rs1) << 15)
-            | (immediate << 20);
-
-        return *this;
-    }
-
-    Instruction& Instruction::s(std::uint32_t imm1, Funct3 funct3, XRegister rs1, XRegister rs2)
-    {
-        this->instruction |= ((imm1 & 0b11111) << 7)
-            | (static_cast<std::underlying_type<Funct3>::type>(funct3) << 12)
-            | (static_cast<std::underlying_type<XRegister>::type>(rs1) << 15)
-            | (static_cast<std::underlying_type<XRegister>::type>(rs2) << 20)
-            | ((imm1 & 0b111111100000) << 20);
-
-        return *this;
-    }
-
-    Instruction& Instruction::r(XRegister rd, Funct3 funct3, XRegister rs1, XRegister rs2, Funct7 funct7)
-    {
-        this->instruction |= (static_cast<std::underlying_type<XRegister>::type>(rd) << 7)
-            | (static_cast<std::underlying_type<Funct3>::type>(funct3) << 12)
-            | (static_cast<std::underlying_type<XRegister>::type>(rs1) << 15)
-            | (static_cast<std::underlying_type<XRegister>::type>(rs2) << 20)
-            | (static_cast<std::underlying_type<Funct7>::type>(funct7) << 25);
-
-        return *this;
-    }
-
-    Instruction& Instruction::u(XRegister rd, std::uint32_t imm)
-    {
-        this->instruction |= (static_cast<std::underlying_type<XRegister>::type>(rd) << 7) | (imm << 12);
-
-        return *this;
-    }
-
-    std::uint8_t *Instruction::encode()
-    {
-        return reinterpret_cast<std::uint8_t *>(&this->instruction);
-    }
-
-    void RiscVVisitor::visit(ir::Node *)
-    {
-    }
-
-    void RiscVVisitor::visit(ir::Definition *definition)
-    {
-        const uint stackSize = static_cast<std::uint32_t>(definition->statementsLength * 4 + 12);
-
-        this->instructionsLength += 4;
-        this->instructions = reinterpret_cast<Instruction *>(
-                realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
-
-        // Prologue.
-        this->instructions[instructionsLength - 4] = Instruction(BaseOpcode::opImm)
-            .i(XRegister::sp, Funct3::addi, XRegister::sp, -stackSize);
-        this->instructions[instructionsLength - 3] = Instruction(BaseOpcode::store)
-            .s(stackSize - 4, Funct3::sw, XRegister::sp, XRegister::s0);
-        this->instructions[instructionsLength - 2] = Instruction(BaseOpcode::store)
-            .s(stackSize - 8, Funct3::sw, XRegister::sp, XRegister::ra);
-        this->instructions[instructionsLength - 1] = Instruction(BaseOpcode::opImm)
-            .i(XRegister::s0, Funct3::addi, XRegister::sp, stackSize);
-
-        for (std::size_t i = 0; i < definition->statementsLength; ++i)
-        {
-            definition->statements[i]->accept(this);
-        }
-        this->registerInUse = true;
-        definition->result->accept(this);
-        this->registerInUse = false;
-
-        this->instructions = reinterpret_cast<Instruction*>(
-            realloc(this->instructions, (this->instructionsLength + 10) * sizeof(Instruction)));
-
-        // Print the result.
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::opImm)
-            .i(XRegister::a1, Funct3::addi, XRegister::a0, 0);
-        this->references[0] = Reference();
-        this->references[0].name = ".CL0";
-        this->references[0].offset = instructionsLength * 4;
-        this->references[0].target = Target::high20;
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::lui).u(XRegister::a5, 0);
-        this->references[1] = Reference();
-        this->references[1].name = ".CL0";
-        this->references[1].offset = instructionsLength * 4;
-        this->references[1].target = Target::lower12i;
-
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::opImm)
-            .i(XRegister::a0, Funct3::addi, XRegister::a5, 0);
-        this->references[2] = Reference();
-        this->references[2].name = "printf";
-        this->references[2].offset = instructionsLength * 4;
-        this->references[2].target = Target::text;
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::auipc).u(XRegister::ra, 0);
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::jalr)
-            .i(XRegister::ra, Funct3::jalr, XRegister::ra, 0);
-        // Set the return value (0).
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::op)
-            .r(XRegister::a0, Funct3::_and, XRegister::zero, XRegister::zero);
-
-        // Epilogue.
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::load)
-            .i(XRegister::s0, Funct3::lw, XRegister::sp, stackSize - 4);
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::load)
-            .i(XRegister::ra, Funct3::lw, XRegister::sp, stackSize - 8);
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::opImm)
-                .i(XRegister::sp, Funct3::addi, XRegister::sp, stackSize);
-        this->instructions[instructionsLength++] = Instruction(BaseOpcode::jalr)
-            .i(XRegister::zero, Funct3::jalr, XRegister::ra, 0);
-    }
-
-    void RiscVVisitor::visit(ir::Operand *operand)
-    {
-        if (dynamic_cast<ir::Variable *>(operand) != nullptr)
-        {
-            return dynamic_cast<ir::Variable *>(operand)->accept(this);
-        }
-        if (dynamic_cast<ir::Number *>(operand) != nullptr)
-        {
-            return dynamic_cast<ir::Number *>(operand)->accept(this);
-        }
-    }
-
-    void RiscVVisitor::visit(ir::Variable *variable)
-    {
-        const auto freeRegister = this->registerInUse ? XRegister::a0 : XRegister::t0;
-
-        ++this->instructionsLength;
-        this->instructions = reinterpret_cast<Instruction *>(
-                realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
-        // movl -x(%rbp), %eax; where x is a number.
-        this->instructions[instructionsLength - 1] = Instruction(BaseOpcode::load)
-            .i(freeRegister, Funct3::lw, XRegister::sp,
-                static_cast<std::int8_t>(variable->counter * 4));
-    }
-
-    void RiscVVisitor::visit(ir::Number *number)
-    {
-        const auto freeRegister = this->registerInUse ? XRegister::a0 : XRegister::t0;
-
-        ++this->instructionsLength;
-        this->instructions = reinterpret_cast<Instruction *>(
-                realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
-        this->instructions[this->instructionsLength - 1] =
-            Instruction(BaseOpcode::opImm) // movl $x, %eax; where $x is a number.
-                .i(freeRegister, Funct3::addi, XRegister::zero, number->value);
-    }
-
-    void RiscVVisitor::visit(ir::BinaryExpression *expression)
-    {
-        this->registerInUse = true;
-        expression->lhs->accept(this);
-        this->registerInUse = false;
-        expression->rhs->accept(this);
-
-        this->instructionsLength += 2;
-        this->instructions = reinterpret_cast<Instruction *>(
-                realloc(this->instructions, this->instructionsLength * sizeof(Instruction)));
-        // Calculate the result and assign it to a variable on the stack.
-        switch (expression->_operator)
-        {
-            case BinaryOperator::sum:
-                this->instructions[instructionsLength - 2] = Instruction(BaseOpcode::op)
-                    .r(XRegister::a0, Funct3::add, XRegister::a0, XRegister::t0);
-                break;
-            case BinaryOperator::subtraction:
-                this->instructions[instructionsLength - 2] = Instruction(BaseOpcode::op)
-                    .r(XRegister::a0, Funct3::sub, XRegister::a0, XRegister::t0, Funct7::sub);
-                break;
-        }
-        this->instructions[instructionsLength - 1] = // movl %eax, -x(%rbp); where x is a number.
-            Instruction(BaseOpcode::store)
-                .s(static_cast<std::uint32_t>(this->variableCounter * 4), Funct3::sw, XRegister::sp, XRegister::a0);
-
-        ++this->variableCounter;
-    }
-}

tests/7_member_sum.eln

@@ -1 +0,0 @@
-! 3 + 4 + 5 + 1 + 2 + 4 + 3

tests/const_list.eln

@@ -1,3 +0,0 @@
-const a = 1, b = 2;
-! a + b
-.

tests/expectations/7_member_sum.txt

@@ -1 +0,0 @@
-22

tests/expectations/const_list.txt

@@ -1 +0,0 @@
-3

tests/expectations/left_nested_sum.txt

@@ -1 +0,0 @@
-8

tests/expectations/print_number.txt

@@ -1 +0,0 @@
-3

tests/expectations/subtraction.txt

@@ -1 +0,0 @@
-1

tests/expectations/sum.txt

@@ -1 +0,0 @@
-8

tests/expectations/sums.txt

@@ -1 +0,0 @@
-8

tests/left_nested_sum.eln

@@ -1,2 +0,0 @@
-! (3 + 4) + 1
-.

tests/print_number.eln

@@ -1,2 +0,0 @@
-! 3
-.

tests/runner.cpp

@@ -35,48 +35,11 @@ namespace elna
         }
     }
 
-    static std::string in_build_directory(const std::filesystem::path& path)
-    {
-        return "build/riscv" / path;
-    }
-
-    static int build_test(const std::filesystem::directory_entry& test_entry)
-    {
-        const std::filesystem::path test_filename = test_entry.path().filename();
-
-        std::filesystem::path test_binary = in_build_directory(test_filename);
-        std::filesystem::path test_object = test_binary;
-        test_binary.replace_extension();
-        test_object.replace_extension(".o");
-
-        std::filesystem::remove(test_binary);
-        std::filesystem::remove(test_object);
-
-        auto status = boost::process::system("./build/bin/elna",
-                "-o", test_object.string(), test_entry.path().string());
-        if (status != 0)
-        {
-            return status;
-        }
-        status = boost::process::system(
-                "/opt/riscv/bin/riscv32-unknown-elf-ld",
-                "-o", test_binary.string(),
-                "-L/opt/riscv/lib/gcc/riscv32-unknown-elf/13.2.0/",
-                "-L/opt/riscv/riscv32-unknown-elf/lib",
-                "/opt/riscv/riscv32-unknown-elf/lib/crt0.o",
-                "/opt/riscv/lib/gcc/riscv32-unknown-elf/13.2.0/crtbegin.o",
-               test_object.string(),
-                "--start-group", "-lgcc", "-lc", "-lgloss", "--end-group",
-                "/opt/riscv/lib/gcc/riscv32-unknown-elf/13.2.0/crtend.o"
-        );
-        return status;
-    }
-
     static int run_test(const std::filesystem::directory_entry& test_entry)
     {
         const std::filesystem::path test_filename = test_entry.path().filename();
 
-        std::filesystem::path test_binary = in_build_directory(test_filename);
+        std::filesystem::path test_binary = "build/riscv" / test_filename;
         test_binary.replace_extension();
 
         std::filesystem::path expectation_path = test_entry.path().parent_path() / "expectations" / test_filename;
@@ -112,23 +75,7 @@ namespace elna
             {
                 continue;
             }
-            int status{ 0 };
+            results.add_exit_code(run_test(test_entry));
-
-            try
-            {
-                status = build_test(test_entry);
-            }
-            catch (const boost::process::process_error& exception)
-            {
-                std::cout << exception.what() << std::endl;
-                status = 3;
-                continue;
-            }
-            if (status == 0)
-            {
-                status = run_test(test_entry);
-            }
-            results.add_exit_code(status);
         }
         return results;
     }

tests/subtraction.eln

@@ -1,2 +0,0 @@
-! 5 - 4
-.

tests/sum.eln

@@ -1,2 +0,0 @@
-! 1 + 7
-.

tests/sums.eln

@@ -1,2 +0,0 @@
-! 1 + (3 + 4)
-.