X-Git-Url: https://www.ginac.de/ginac.git//ginac.git?p=ginac.git;a=blobdiff_plain;f=ginac%2Fprint.h;h=dccaecd889bcdd8ceb4a0a6a5d52aa322f3a8600;hp=3e55db5d7fde5e7bd86ffcfc3bbe5533fe0bf706;hb=eefedc70f63222beca918a3df89cabac700df1eb;hpb=3a63743e24046766b37c3d1bd38605542ee0a536

diff --git a/ginac/print.h b/ginac/print.h
index 3e55db5d..dccaecd8 100644
--- a/ginac/print.h
+++ b/ginac/print.h
@@ -3,7 +3,7 @@
  *  Definition of helper classes for expression output. */
 
 /*
- *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *  GiNaC Copyright (C) 1999-2003 Johannes Gutenberg University Mainz, Germany
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -25,91 +25,250 @@
 
 #include <iosfwd>
 #include <string>
+#include <memory>
+
+#include "class_info.h"
 
 namespace GiNaC {
 
-/** Context for default (ginsh-parsable) output. */
+
+/** This class stores information about a registered print_context class. */
+class print_context_options {
+public:
+	print_context_options(const char *n, const char *p, unsigned i)
+	 : name(n), parent_name(p), id(i) {}
+
+	const char *get_name() const { return name; }
+	const char *get_parent_name() const { return parent_name; }
+	unsigned get_id() const { return id; }
+
+private:
+	const char *name;         /**< Class name. */
+	const char *parent_name;  /**< Name of superclass. */
+	unsigned id;              /**< ID number (assigned automatically). */
+};
+
+typedef class_info<print_context_options> print_context_class_info;
+
+
+/** Flags to control the behavior of a print_context. */
+class print_options {
+public:
+	enum {
+		print_index_dimensions = 0x0001 ///< print the dimensions of indices
+	};
+};
+
+
+/** Macro for inclusion in the declaration of a print_context class.
+ *  It declares some functions that are common to all classes derived
+ *  from 'print_context' as well as all required stuff for the GiNaC
+ *  registry. */
+#define GINAC_DECLARE_PRINT_CONTEXT(classname, supername) \
+public: \
+	typedef supername inherited; \
+	friend class function_options; \
+	friend class registered_class_options; \
+public: \
+	static const GiNaC::print_context_class_info &get_class_info_static(); \
+	virtual const GiNaC::print_context_class_info &get_class_info() const { return classname::get_class_info_static(); } \
+	virtual const char *class_name() const { return classname::get_class_info_static().options.get_name(); } \
+	\
+	classname(); \
+	virtual classname * duplicate() const { return new classname(*this); } \
+private:
+
+/** Macro for inclusion in the implementation of each print_context class. */
+#define GINAC_IMPLEMENT_PRINT_CONTEXT(classname, supername) \
+const GiNaC::print_context_class_info &classname::get_class_info_static() \
+{ \
+	static GiNaC::print_context_class_info reg_info = GiNaC::print_context_class_info(GiNaC::print_context_options(#classname, #supername, GiNaC::next_print_context_id++)); \
+	return reg_info; \
+}
+
+
+extern unsigned next_print_context_id;
+
+
+/** Base class for print_contexts. */
 class print_context
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_context, void)
 public:
-	print_context();
-	print_context(std::ostream &);
+	print_context(std::ostream &, unsigned options = 0);
+	virtual ~print_context() {}
 
 	std::ostream & s; /**< stream to output to */
-private:
-	// dummy virtual function to make the class polymorphic
-	virtual void dummy(void) {}
+	unsigned options; /**< option flags */
+};
+
+/** Context for default (ginsh-parsable) output. */
+class print_dflt : public print_context
+{
+	GINAC_DECLARE_PRINT_CONTEXT(print_dflt, print_context)
+public:
+	print_dflt(std::ostream &, unsigned options = 0);
 };
 
 /** Context for latex-parsable output. */
 class print_latex : public print_context
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_latex, print_context)
 public:
-	print_latex();
-	print_latex(std::ostream &);
+	print_latex(std::ostream &, unsigned options = 0);
 };
 
 /** Context for python pretty-print output. */
 class print_python : public print_context
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_python, print_context)
 public:
-	print_python();
-	print_python(std::ostream &);
+	print_python(std::ostream &, unsigned options = 0);
 };
 
 /** Context for python-parsable output. */
 class print_python_repr : public print_context
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_python_repr, print_context)
 public:
-	print_python_repr();
-	print_python_repr(std::ostream &);
+	print_python_repr(std::ostream &, unsigned options = 0);
 };
 
 /** Context for tree-like output for debugging. */
 class print_tree : public print_context
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_tree, print_context)
 public:
-	print_tree(unsigned d = 4);
-	print_tree(std::ostream &, unsigned d = 4);
+	print_tree(unsigned d);
+	print_tree(std::ostream &, unsigned options = 0, unsigned d = 4);
+
 	const unsigned delta_indent; /**< size of indentation step */
 };
 
 /** Base context for C source output. */
 class print_csrc : public print_context
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_csrc, print_context)
 public:
-	print_csrc();
-	print_csrc(std::ostream &);
+	print_csrc(std::ostream &, unsigned options = 0);
 };
 
-/** Context for C source output using float numbers. */
+/** Context for C source output using float precision. */
 class print_csrc_float : public print_csrc
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_csrc_float, print_csrc)
 public:
-	print_csrc_float();
-	print_csrc_float(std::ostream &);
+	print_csrc_float(std::ostream &, unsigned options = 0);
 };
 
-/** Context for C source output using double numbers. */
+/** Context for C source output using double precision. */
 class print_csrc_double : public print_csrc
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_csrc_double, print_csrc)
 public:
-	print_csrc_double();
-	print_csrc_double(std::ostream &);
+	print_csrc_double(std::ostream &, unsigned options = 0);
 };
 
 /** Context for C source output using CLN numbers. */
 class print_csrc_cl_N : public print_csrc
 {
+	GINAC_DECLARE_PRINT_CONTEXT(print_csrc_cl_N, print_csrc)
 public:
-	print_csrc_cl_N();
-	print_csrc_cl_N(std::ostream &);
+	print_csrc_cl_N(std::ostream &, unsigned options = 0);
 };
 
 /** Check if obj is a T, including base classes. */
 template <class T>
 inline bool is_a(const print_context & obj)
-{ return dynamic_cast<const T *>(&obj)!=0; }
+{ return dynamic_cast<const T *>(&obj) != 0; }
+
+
+class basic;
+
+/** Base class for print_functor handlers */
+class print_functor_impl {
+public:
+	virtual ~print_functor_impl() {}
+	virtual print_functor_impl *duplicate() const = 0;
+	virtual void operator()(const basic & obj, const print_context & c, unsigned level) const = 0;
+};
+
+/** print_functor handler for pointer-to-functions of class T, context type C */
+template <class T, class C>
+class print_ptrfun_handler : public print_functor_impl {
+public:
+	typedef void (*F)(const T &, const C &, unsigned);
+
+	print_ptrfun_handler(F f_) : f(f_) {}
+	print_ptrfun_handler *duplicate() const { return new print_ptrfun_handler(*this); }
+
+	void operator()(const basic & obj, const print_context & c, unsigned level) const
+	{
+		// Call the supplied function
+		f(dynamic_cast<const T &>(obj), dynamic_cast<const C &>(c), level);
+	}
+
+private:
+	F f;
+};
+
+/** print_functor handler for member functions of class T, context type C */
+template <class T, class C>
+class print_memfun_handler : public print_functor_impl {
+public:
+	typedef void (T::*F)(const C & c, unsigned level);
+
+	print_memfun_handler(F f_) : f(f_) {}
+	print_memfun_handler *duplicate() const { return new print_memfun_handler(*this); }
+
+	void operator()(const basic & obj, const print_context & c, unsigned level) const
+	{
+		// Call the supplied member function
+		return (dynamic_cast<const T &>(obj).*f)(dynamic_cast<const C &>(c), level);
+	}
+
+private:
+	F f;
+};
+
+/** This class represents a print method for a certain algebraic class and
+ *  print_context type. Its main purpose is to hide the difference between
+ *  member functions and nonmember functions behind one unified operator()
+ *  interface. print_functor has value semantics and acts as a smart pointer
+ *  (with deep copy) to a class derived from print_functor_impl which
+ *  implements the actual function call. */
+class print_functor {
+public:
+	print_functor() : impl(0) {}
+	print_functor(const print_functor & other) : impl(other.impl.get() ? other.impl->duplicate() : 0) {}
+	print_functor(std::auto_ptr<print_functor_impl> impl_) : impl(impl_) {}
+
+	template <class T, class C>
+	print_functor(void f(const T &, const C &, unsigned)) : impl(new print_ptrfun_handler<T, C>(f)) {}
+
+	template <class T, class C>
+	print_functor(void (T::*f)(const C &, unsigned)) : impl(new print_memfun_handler<T, C>(f)) {}
+
+	print_functor & operator=(const print_functor & other)
+	{
+		if (this != &other) {
+			print_functor_impl *p = other.impl.get();
+			impl.reset(p ? other.impl->duplicate() : 0);
+		}
+		return *this;
+	}
+
+	void operator()(const basic & obj, const print_context & c, unsigned level) const
+	{
+		(*impl)(obj, c, level);
+	}
+
+	bool is_valid() const { return impl.get(); }
+
+private:
+	std::auto_ptr<print_functor_impl> impl;
+};
+
 
 } // namespace GiNaC