openmw/components/compiler/exprparser.hpp

#ifndef COMPILER_EXPRPARSER_H_INCLUDED
#define COMPILER_EXPRPARSER_H_INCLUDED

#include <vector>

#include <components/interpreter/types.hpp>

#include "parser.hpp"
#include "tokenloc.hpp"

namespace Compiler
{
    class Locals;
    class Literals;

    class ExprParser : public Parser
    {
        Locals& mLocals;
        Literals& mLiterals;
        std::vector<char> mOperands;
        std::vector<char> mOperators;
        bool mNextOperand;
        TokenLoc mTokenLoc;
        std::vector<Interpreter::Type_Code> mCode;
        bool mFirst;
        bool mArgument;
        std::string mExplicit;
        bool mRefOp;
        bool mMemberOp;

        static int getPriority(char op);

        char getOperandType(int Index = 0) const;

        char getOperator() const;

        bool isOpen() const;

        void popOperator();

        void popOperand();

        void replaceBinaryOperands();

        void pop();

        void pushIntegerLiteral(int value);

        void pushFloatLiteral(float value);

        void pushBinaryOperator(char c);

        void close();

        int parseArguments(const std::string& arguments, Scanner& scanner);

        bool handleMemberAccess(const std::string& name);

    public:
        ExprParser(ErrorHandler& errorHandler, const Context& context, Locals& locals, Literals& literals,
            bool argument = false);
        ///< constructor
        /// \param argument Parser is used to parse function- or instruction-
        /// arguments (this influences the precedence rules).

        char getType() const;
        ///< Return type of parsed expression ('l' integer, 'f' float)

        bool parseInt(int value, const TokenLoc& loc, Scanner& scanner) override;
        ///< Handle an int token.
        /// \return fetch another token?

        bool parseFloat(float value, const TokenLoc& loc, Scanner& scanner) override;
        ///< Handle a float token.
        /// \return fetch another token?

        bool parseName(const std::string& name, const TokenLoc& loc, Scanner& scanner) override;
        ///< Handle a name token.
        /// \return fetch another token?

        bool parseKeyword(int keyword, const TokenLoc& loc, Scanner& scanner) override;
        ///< Handle a keyword token.
        /// \return fetch another token?

        bool parseSpecial(int code, const TokenLoc& loc, Scanner& scanner) override;
        ///< Handle a special character token.
        /// \return fetch another token?

        void reset() override;
        ///< Reset parser to clean state.

        char append(std::vector<Interpreter::Type_Code>& code);
        ///< Generate code for parsed expression.
        /// \return Type ('l': integer, 'f': float)

        int parseArguments(const std::string& arguments, Scanner& scanner, std::vector<Interpreter::Type_Code>& code,
            int ignoreKeyword = -1, bool expectNames = false);
        ///< Parse sequence of arguments specified by \a arguments.
        /// \param arguments Uses ScriptArgs typedef
        /// \see Compiler::ScriptArgs
        /// \param invert Store arguments in reverted order.
        /// \param ignoreKeyword A keyword that is seen as junk
        /// \return number of optional arguments

        const TokenLoc& getTokenLoc() const;
    };
}

#endif