State.hpp

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/**
 * @file State.hpp
 * @author Alexandre Plateau (lexplt.dev@gmail.com)
 * @brief State used by the virtual machine: it loads the bytecode, can compile it if needed, load C++ functions...
 * @version 0.2
 * @date 2020-10-27
 * 
 * @copyright Copyright (c) 2020-2021
 * 
 */
 
#ifndef ARK_VM_STATE_HPP
#define ARK_VM_STATE_HPP
 
#include <string>
#include <vector>
#include <cinttypes>
#include <unordered_map>
 
#include <Ark/VM/Value.hpp>
#include <Ark/Compiler/BytecodeReader.hpp>
#include <Ark/Compiler/Compiler.hpp>
 
namespace Ark
{
    /**
     * @brief Ark state to handle the dirty job of loading and compiling ArkScript code
     * 
     */
    class ARK_API State
    {
    public:
        /**
         * @brief Construct a new State object
         * 
         * @param options the options for the virtual machine, compiler, and parser
         * @param libpath a list of search paths for the std library
         */
        State(uint16_t options = DefaultFeatures, const std::vector<std::string>& libpath = {}) noexcept;
 
        /**
         * @brief Feed the state by giving it the path to an existing bytecode file
         * 
         * @param bytecode_filename 
         * @return true on success
         * @return false on failure
         */
        bool feed(const std::string& bytecode_filename);
 
        /**
         * @brief Feed the state with ArkScript bytecode
         * 
         * @param bytecode 
         * @return true on success
         * @return false on failure
         */
        bool feed(const bytecode_t& bytecode);
 
        /**
         * @brief Compile a file, and use the resulting bytecode
         * 
         * @param filename path to an ArkScript code file
         * @return true on success
         * @return false on failure
         */
        bool doFile(const std::string& filename);
 
        /**
         * @brief Compile a string (representing ArkScript code) and store resulting bytecode in m_bytecode
         * 
         * @param code the ArkScript code
         * @return true on success
         * @return false on failure
         */
        bool doString(const std::string& code);
 
        /**
         * @brief Register a function in the virtual machine
         * 
         * @param name the name of the function in ArkScript
         * @param function the code of the function
         */
        void loadFunction(const std::string& name, Value::ProcType function) noexcept;
 
        /**
         * @brief Set the script arguments in sys:args
         * 
         * @param args 
         */
        void setArgs(const std::vector<std::string>& args) noexcept;
 
        /**
         * @brief Set the debug level
         * 
         * @param level between 0 (nothing) and 3 (maximum verbosity)
         */
        void setDebug(unsigned level) noexcept;
 
        /**
         * @brief Set the std search paths
         * 
         * @param libenv the list of std search paths to set
         */
        void setLibDirs(const std::vector<std::string>& libenv) noexcept;
 
        /**
         * @brief Reset State (all member variables related to execution)
         * 
         */
        void reset() noexcept;
 
        friend class VM;
        friend class Repl;
 
    private:
        /**
         * @brief Called to configure the state (set the bytecode, debug level, call the compiler...)
         * 
         */
        void configure();
 
        /**
         * @brief Reads and compiles code of file
         * 
         * @param file the path of file code to compile 
         * @param output set path of .arkc file
         * @return true on success
         * @return false on failure and raise an exception
         */
        bool compile(const std::string& file, const std::string& output);
 
        inline void throwStateError(const std::string& message)
        {
            throw std::runtime_error("StateError: " + message);
        }
 
        unsigned m_debug_level;
 
        bytecode_t m_bytecode;
        std::vector<std::string> m_libenv;
        std::string m_filename;
        uint16_t m_options;
 
        // related to the bytecode
        std::vector<std::string> m_symbols;
        std::vector<Value> m_constants;
        std::vector<bytecode_t> m_pages;
 
        // related to the execution
        std::unordered_map<std::string, Value> m_binded;
    };
}
 
#endif