symbol.dc

Object-Oriented Programming With ANSI-C这本书中的源代码!找了很久

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "parse.h"		// error()
#include "Node.h"

% Symbol ctor {
	struct Symbol * self = super_ctor(Symbol(), _self, app);

	self -> name = va_arg(* app, const char *);
	self -> lex = va_arg(* app, int);
	return self;
}

% Symbol name {
%casts
	return self -> name;
}

% Symbol lex {
%casts
	return self -> lex;
}

% : Reserved delete {		// don't respondTo delete
}

% Var value {
%casts
	return self -> value;
}

% Var setvalue {
%casts
	return self -> value = value;
}

% Const ctor {
	struct Const * self = super_ctor(Const(), _self, app);

	setvalue(self, va_arg(* app, double));
	return self;
}

% : Const delete {		// don't respondTo delete
}

% Fun setfun {
%casts
	if (self -> fun)
		delete(self -> fun);
	self -> fun = fun;
}

% Fun funvalue {
%casts
	if (! self -> fun)
		error("undefined function");
	setvalue(self, value);	// argument for parameter
	return exec(self -> fun);
}

% Math ctor {
	struct Math * self = super_ctor(Math(), _self, app);

	self -> fun = va_arg(* app, function);
	return self;
}

% : Math delete {		// don't respondTo delete
}

% Math mathvalue {
	double result;
%casts
	errno = 0;
	result = self -> fun(value);
	if (errno)
		error("error in %s: %s", name(self), strerror(errno));
	return result;
}

%init