insert_whitespace_detection.hpp

来自「Boost provides free peer-reviewed portab」· HPP 代码 · 共 514 行 · 第 1/2 页

            return impl::handle_alt_leftbracket(prev, beforeprev); 
        case T_FIXEDPOINTLIT:
            return impl::handle_fixedpointlit(prev, beforeprev); 
        case T_DOT:
            return impl::handle_dot(prev, beforeprev); 
        case T_QUESTION_MARK:
            return impl::handle_questionmark(prev, beforeprev); 
        case T_NEWLINE:
            return impl::handle_newline(prev, beforeprev); 

        case T_LEFTPAREN:
        case T_RIGHTPAREN:
        case T_LEFTBRACKET:
        case T_RIGHTBRACKET:
        case T_SEMICOLON:
        case T_COMMA:
        case T_COLON:
            switch (static_cast<unsigned int>(prev)) {
            case T_LEFTPAREN:
            case T_RIGHTPAREN:
            case T_LEFTBRACKET:
            case T_RIGHTBRACKET:
            case T_LEFTBRACE:
            case T_RIGHTBRACE:
                return false;   // no insertion between parens/brackets/braces

            default:
                if (IS_CATEGORY(prev, OperatorTokenType))
                    return false;
                break;
            }        
            break;
            
        case T_LEFTBRACE:
        case T_RIGHTBRACE:
            switch (static_cast<unsigned int>(prev)) {
            case T_LEFTPAREN:
            case T_RIGHTPAREN:
            case T_LEFTBRACKET:
            case T_RIGHTBRACKET:
            case T_LEFTBRACE:
            case T_RIGHTBRACE:
            case T_SEMICOLON:
            case T_COMMA:
            case T_COLON:
                return false;   // no insertion between parens/brackets/braces

            case T_QUESTION_MARK:
                if (T_QUESTION_MARK == beforeprev)
                    return true;
                if (IS_CATEGORY(prev, OperatorTokenType))
                    return false;
                break;
                
            default:
                break;
            }
            break;
                            
        case T_MINUS:
        case T_MINUSMINUS:
        case T_MINUSASSIGN:
            if (T_MINUS == prev || T_MINUSMINUS == prev)
                return true;
            if (!impl::handle_parens(prev))
                return false;
            if (T_QUESTION_MARK == prev && T_QUESTION_MARK == beforeprev)
                return true;
            break;
            
        case T_PLUS:
        case T_PLUSPLUS:
        case T_PLUSASSIGN:
            if (T_PLUS == prev || T_PLUSPLUS == prev)
                return true;
            if (!impl::handle_parens(prev))
                return false;
            if (T_QUESTION_MARK == prev && T_QUESTION_MARK == beforeprev)
                return true;
            break;
            
        case T_DIVIDE:
        case T_DIVIDEASSIGN:
            if (T_DIVIDE == prev)
                return true;
            if (!impl::handle_parens(prev))
                return false;
            if (T_QUESTION_MARK == prev && T_QUESTION_MARK == beforeprev)
                return true;
            break;
        
        case T_EQUAL:
        case T_ASSIGN:
            switch (static_cast<unsigned int>(prev)) {
            case T_PLUSASSIGN:
            case T_MINUSASSIGN:
            case T_DIVIDEASSIGN:
            case T_STARASSIGN:
            case T_SHIFTRIGHTASSIGN:
            case T_SHIFTLEFTASSIGN:
            case T_EQUAL:
            case T_NOTEQUAL:
            case T_LESSEQUAL:
            case T_GREATEREQUAL:
            case T_LESS:
            case T_GREATER:
            case T_PLUS:
            case T_MINUS:
            case T_STAR:
            case T_DIVIDE:
            case T_ORASSIGN:
            case T_ANDASSIGN:
            case T_XORASSIGN:
            case T_OR:
            case T_AND:
            case T_XOR:
            case T_OROR:
            case T_ANDAND:
                return true;

            case T_QUESTION_MARK:
                if (T_QUESTION_MARK == beforeprev)
                    return true;
                break;
                
            default:
                if (!impl::handle_parens(prev))
                    return false;
                break;
            }
            break;

        case T_GREATER:
            if (T_MINUS == prev || T_GREATER == prev)
                return true;    // prevent -> or >>
            if (!impl::handle_parens(prev))
                return false;
            if (T_QUESTION_MARK == prev && T_QUESTION_MARK == beforeprev)
                return true;
            break;

        case T_LESS:
            if (T_LESS == prev)
                return true;    // prevent <<
            // fall through
        case T_CHARLIT:
        case T_NOT:
        case T_NOTEQUAL:
            if (!impl::handle_parens(prev))
                return false;
            if (T_QUESTION_MARK == prev && T_QUESTION_MARK == beforeprev)
                return true;
            break;

        case T_AND:
        case T_ANDAND:
            if (!impl::handle_parens(prev))
                return false;
            if (T_AND == prev || T_ANDAND == prev)
                return true;
            break;
            
        case T_OR:
            if (!impl::handle_parens(prev))
                return false;
            if (T_OR == prev)
                return true;
            break;
            
        case T_XOR:
            if (!impl::handle_parens(prev))
                return false;
            if (T_XOR == prev)
                return true;
            break;
            
        case T_COMPL_ALT:
        case T_OR_ALT:
        case T_AND_ALT:
        case T_NOT_ALT:
        case T_XOR_ALT:
        case T_ANDASSIGN_ALT:
        case T_ORASSIGN_ALT:
        case T_XORASSIGN_ALT:
        case T_NOTEQUAL_ALT:
            switch (static_cast<unsigned int>(prev)) {
            case T_LEFTPAREN:
            case T_RIGHTPAREN:
            case T_LEFTBRACKET:
            case T_RIGHTBRACKET:
            case T_LEFTBRACE:
            case T_RIGHTBRACE:
            case T_SEMICOLON:
            case T_COMMA:
            case T_COLON:
                // no insertion between parens/brackets/braces and operators
                return false;   

            case T_IDENTIFIER:
                if (T_NONREPLACABLE_IDENTIFIER == prev ||
                    IS_CATEGORY(prev, KeywordTokenType))
                {
                    return true;
                }
                break;
                
            default:
                break;
            }
            break;
            
        case T_STAR:
            if (T_STAR == prev)
                return false;     // '*****' do not need to be separated
            if (T_GREATER== prev && 
                (T_MINUS == beforeprev || T_MINUSMINUS == beforeprev)
               )
            {
                return true;    // prevent ->*
            }
            break;
        }

    // FIXME: else, handle operators separately (will catch to many cases)
//         if (IS_CATEGORY(current, OperatorTokenType) && 
//             IS_CATEGORY(prev, OperatorTokenType))
//         {
//             return true;    // operators must be delimited always
//         }
        return false;
    }
    void shift_tokens (boost::wave::token_id next_id)
    {
        if (insert_whitespace) {
            beforeprev = prev;
            prev = next_id;
        }
    }
    
private:
    bool insert_whitespace;            // enable this component
    boost::wave::token_id prev;        // the previous analyzed token
    boost::wave::token_id beforeprev;  // the token before the previous
};

///////////////////////////////////////////////////////////////////////////////
}   //  namespace util
}   //  namespace wave 
}   //  namespace boost

// the suffix header occurs after all of the code
#ifdef BOOST_HAS_ABI_HEADERS
#include BOOST_ABI_SUFFIX
#endif

#endif // !defined(INSERT_WHITESPACE_DETECTION_HPP_765EF77B_0513_4967_BDD6_6A38148C4C96_INCLUDED)