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#2
rrc882019-01-20 15:47
 程序代码：namespace Lexer { /* Tag.hpp * 定义了各词法单元对应的常量 * */ const static int AND = 256, BASIC = 257, BREAK = 258, DO = 259, ELSE = 260, EQ = 261, FALSE = 262, GE = 263, ID = 264, IF = 265, INDEX = 266, LE = 267, MINUS = 268, NE = 269, NUMBER = 270, OR = 271, FLOAT = 272, TEMP = 273, TRUE = 274, WHILE = 275; } 程序代码：#include <ostream> namespace Lexer { /* 符号流的定义类 * 保存符号流的标记(在Tag类中定义标记的常量) * */ class Token { public: Token( int t ) : tag(t) {} friend std::ostream& operator<< ( std::ostream& out, const Token& tok ) { out << (char)tok.tag; return out; } public: int tag; }; } |
程序代码：#include <string>
#include <ostream>
#include "Tag.hpp"
#include "Token.hpp"
namespace Lexer {
/* Word.hpp
* 用Word类管理保留字、标识符和复合单元词素(如&&, ||) */
class Word : public Lexer::Token {
public:
Word( std::string str, int tag )
: Token( tag ), lexeme( str ) {}
~Word() {}
virtual void initial() final {
Lexer::Word
*and = new Lexer::Word( "&&", Lexer::AND ), *or = new Lexer::Word( "||", Lexer::OR ),
*eq = new Lexer::Word( "==", Lexer::EQ ), *ne = new Lexer::Word( "!=", Lexer::NE ),
*le = new Lexer::Word( "<=", Lexer::LE ), *ge = new Lexer::Word( ">=", Lexer::GE ),
*minus = new Lexer::Word( "minus", Lexer::MINUS ), // minus 代表单目减号, 如-2
*True = new Lexer::Word( "true", Lexer::TRUE ),
*False = new Lexer::Word( "false", Lexer::FALSE ),
*temp = new Lexer::Word( "temp", Lexer::TEMP );
}
public:
friend std::ostream& operator<<( std::ostream& out, const Lexer::Word& w ) {
out << w.lexeme;
return out;
}
public:
std::string lexeme;
};
}
找不到自己哪里出错了，求解！！！#include <ostream>
#include "Tag.hpp"
#include "Token.hpp"
namespace Lexer {
/* Word.hpp
* 用Word类管理保留字、标识符和复合单元词素(如&&, ||) */
class Word : public Lexer::Token {
public:
Word( std::string str, int tag )
: Token( tag ), lexeme( str ) {}
~Word() {}
virtual void initial() final {
Lexer::Word
*and = new Lexer::Word( "&&", Lexer::AND ), *or = new Lexer::Word( "||", Lexer::OR ),
*eq = new Lexer::Word( "==", Lexer::EQ ), *ne = new Lexer::Word( "!=", Lexer::NE ),
*le = new Lexer::Word( "<=", Lexer::LE ), *ge = new Lexer::Word( ">=", Lexer::GE ),
*minus = new Lexer::Word( "minus", Lexer::MINUS ), // minus 代表单目减号, 如-2
*True = new Lexer::Word( "true", Lexer::TRUE ),
*False = new Lexer::Word( "false", Lexer::FALSE ),
*temp = new Lexer::Word( "temp", Lexer::TEMP );
}
public:
friend std::ostream& operator<<( std::ostream& out, const Lexer::Word& w ) {
out << w.lexeme;
return out;
}
public:
std::string lexeme;
};
}
