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//=============================================================================
// File: text.h
// Contents: Declarations for DwText
// Maintainer: Doug Sauder <dwsauder@fwb.gulf.net>
// WWW: http://www.fwb.gulf.net/~dwsauder/mimepp.html
//
// Copyright (c) 1996, 1997 Douglas W. Sauder
// All rights reserved.
//
// IN NO EVENT SHALL DOUGLAS W. SAUDER BE LIABLE TO ANY PARTY FOR DIRECT,
// INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
// THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF DOUGLAS W. SAUDER
// HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// DOUGLAS W. SAUDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT
// NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
// BASIS, AND DOUGLAS W. SAUDER HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
// SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
//
//=============================================================================
#ifndef DW_TEXT_H
#define DW_TEXT_H
#ifndef DW_CONFIG_H
#include <mimelib/config.h>
#endif
#ifndef DW_STRING_H
#include <mimelib/string.h>
#endif
#ifndef DW_FIELDBDY_H
#include <mimelib/fieldbdy.h>
#endif
//=============================================================================
//+ Name DwText -- Class representing text in a RFC-822 header field-body
//+ Description
//. {\tt DwText} represents an unstructured field body in a header field.
//. It roughly corresponds to the {\it text} element of the BNF grammar
//. defined in RFC-822.
//=============================================================================
// Last modified 1997-07-30
//+ Noentry ~DwText sClassName _PrintDebugInfo
class DW_EXPORT DwText : public DwFieldBody {
public:
DwText();
DwText(const DwText& aText);
DwText(const DwString& aStr, DwMessageComponent* aParent=0);
//. The first constructor is the default constructor, which sets the
//. {\tt DwText} object's string representation to the empty string
//. and sets its parent to NULL.
//.
//. The second constructor is the copy constructor, which copies the
//. string representation from {\tt aText}.
//. The parent of the new {\tt DwText} object is set to NULL.
//.
//. The third constructor copies {\tt aStr} to the {\tt DwText}
//. object's string representation and sets {\tt aParent} as its parent.
//. The virtual member function {\tt Parse()} should be called immediately
//. after this constructor in order to parse the string representation.
//. Unless it is NULL, {\tt aParent} should point to an object of a class
//. derived from {\tt DwField}.
virtual ~DwText();
const DwText& operator = (const DwText& aText);
//. This is the assignment operator.
virtual void Parse();
//. This virtual member function is inherited from
//. {\tt DwMessageComponent}, where it is declared a pure virtual
//. function. For a {\tt DwText} object, this member function does
//. nothing, since {\tt DwText} represents an unstructured field body
//. (like the Subject header field) that does not have a broken-down
//. form.
//.
//. Note, however, that this function should still be called consistently,
//. since a subclass of {\tt DwText} may implement a parse method.
//.
//. This function clears the is-modified flag.
virtual void Assemble();
//. This virtual member function is inherited from
//. {\tt DwMessageComponent}, where it is declared a pure virtual
//. function. For a {\tt DwText} object, this member function does
//. nothing, since {\tt DwText} represents an unstructured field body
//. (like the Subject header field) that does not have a broken-down
//. form.
//.
//. Note, however, that this function should still be called consistently,
//. since a subclass of {\tt DwText} may implement an assemble method.
//.
//. This function clears the is-modified flag.
virtual DwMessageComponent* Clone() const;
//. This virtual function, inherited from {\tt DwMessageComponent},
//. creates a new {\tt DwText} on the free store that has the same
//. value as this {\tt DwText} object. The basic idea is that of
//. a ``virtual copy constructor.''
static DwText* NewText(const DwString& aStr, DwMessageComponent* aParent);
//. Creates a new {\tt DwText} object on the free store.
//. If the static data member {\tt sNewText} is NULL,
//. this member function will create a new {\tt DwText}
//. and return it. Otherwise, {\tt NewText()} will call
//. the user-supplied function pointed to by {\tt sNewText},
//. which is assumed to return an object from a class derived from
//. {\tt DwText}, and return that object.
//+ Var sNewText
static DwText* (*sNewText)(const DwString&, DwMessageComponent*);
//. If {\tt sNewText} is not NULL, it is assumed to point to a
//. user-supplied function that returns an object from a class derived from
//. {\tt DwText}.
private:
static const char* const sClassName;
public:
virtual void PrintDebugInfo(std::ostream& aStrm, int aDepth=0) const;
//. This virtual function, inherited from {\tt DwMessageComponent},
//. prints debugging information about this object to {\tt aStrm}.
//. It will also call {\tt PrintDebugInfo()} for any of its child
//. components down to a level of {\tt aDepth}.
//.
//. This member function is available only in the debug version of
//. the library.
virtual void CheckInvariants() const;
//. Aborts if one of the invariants of the object fails. Use this
//. member function to track down bugs.
//.
//. This member function is available only in the debug version of
//. the library.
protected:
void _PrintDebugInfo(std::ostream& aStrm) const;
};
#endif
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