/* $Id$ * $Log$ * Revision 1.1.4.1 2001/06/30 03:26:20 geraint * gcc-3.0 compatibility. * * Revision 1.1 2000/12/28 09:47:29 peterg * put under RCS * * Revision 1.1 2000/10/31 04:29:11 geraint * Initial revision * */ #include #include using namespace std; class Bracket { public: friend ostream &operator<< (ostream &str, Bracket *b); friend string &operator<< (string &str, Bracket *b); friend string &operator+= (string &str, Bracket *b); friend string operator+ (string &str, Bracket *b); virtual int get_nesting_depth (void) = 0; protected: Bracket (char left, char right) { _l = left; _r = right; } ostream &open (ostream &str) { this->increment_nesting (); return str << this->_l; } string &open (string &str) { this->increment_nesting (); return str += this->_l; } ostream &close (ostream &str) { this->decrement_nesting (); return str << this->_r; } string &close (string &str) { this->decrement_nesting (); return str += this->_r; } protected: virtual int increment_nesting (void) = 0; virtual int decrement_nesting (void) = 0; virtual ostream &display (ostream &str) = 0; virtual string &display (string &str) = 0; private: char _l, _r; }; class Brace : public Bracket { public: int get_nesting_depth (void) { return (this->nesting_depth);} string indentation (int n = nesting_depth) { string s = ""; int i; for (i = 0; i < n; i++) s += " "; return s; } protected: Brace () : Bracket ('{', '}') { ; } int increment_nesting (void) { return ++(this->nesting_depth); } int decrement_nesting (void) { return --(this->nesting_depth); } ostream &open (ostream &str) { str << endl << this->indentation (); this->Bracket::open (str); str << endl << this->indentation (); return str; } string &open (string &str) { str += '\n' + this->indentation (); this->Bracket::open (str); str += '\n' + this->indentation (); return str; } ostream &close (ostream &str) { str << endl << this->indentation (nesting_depth - 1); this->Bracket::close (str); str << endl << this->indentation (); return str; } string &close (string &str) { str += '\n' + this->indentation (nesting_depth - 1); this->Bracket::close (str); str += '\n' + this->indentation (); return str; } private: static int nesting_depth; }; int Brace::nesting_depth; class Paren : public Bracket { public: int get_nesting_depth (void) { return (this->nesting_depth);} protected: Paren () : Bracket ('(', ')') { ; } int increment_nesting (void) { return ++(this->nesting_depth); } int decrement_nesting (void) { return --(this->nesting_depth); } private: static int nesting_depth; }; int Paren::nesting_depth; class SquareBracket : public Bracket { public: int get_nesting_depth (void) { return (this->nesting_depth);} protected: SquareBracket () : Bracket ('[', ']') { ; } int increment_nesting (void) { return ++(this->nesting_depth); } int decrement_nesting (void) { return --(this->nesting_depth); } private: static int nesting_depth; }; int SquareBracket::nesting_depth; class LeftBrace : public Brace { public: ostream &display (ostream &str) { return this->open (str); } string &display (string &str) { return this->open (str); } }; class RightBrace : public Brace { public: ostream &display (ostream &str) { return this->close (str); } string &display (string &str) { return this->close (str); } }; class LeftParen : public Paren { public: ostream &display (ostream &str) { return this->open (str); } string &display (string &str) { return this->open (str); } }; class RightParen : public Paren { public: ostream &display (ostream &str) { return this->close (str); } string &display (string &str) { return this->close (str); } }; class LeftSquareBracket : public SquareBracket { public: ostream &display (ostream &str) { return this->open (str); } string &display (string &str) { return this->open (str); } }; class Rightbrace : public SquareBracket { public: ostream &display (ostream &str) { return this->close (str); } string &display (string &str) { return this->close (str); } }; ostream &operator<< (ostream &str, Bracket *b) { b->display (str); return str; } string &operator<< (string &str, Bracket *b) { string s; b->display (s); str += s; return str; } string &operator+= (string &str, Bracket *b) { b->display (str); return str; } string operator+ (string &str, Bracket *b) { string s; b->display (s); return (str + s); }