153bc803a8
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45291 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
272 lines
10 KiB
C++
272 lines
10 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/unichar.h
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// Purpose: wxUniChar and wxUniCharRef classes
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// Author: Vaclav Slavik
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// Created: 2007-03-19
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// RCS-ID: $Id$
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// Copyright: (c) 2007 REA Elektronik GmbH
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_UNICHAR_H_
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#define _WX_UNICHAR_H_
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#include "wx/defs.h"
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#include "wx/chartype.h"
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#include "wx/stringimpl.h"
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// wint_t is just a typedef for wchar_t for many old compilers but for modern
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// ones it's a separate type and we must provide a conversion to it to allow
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// passing wxUniChar[Ref] to functions taking wint_t such as iswalnum() &c
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#if (defined(__GNUC__) && !defined(__DARWIN__) && !defined(__OS2__)) || \
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(defined(__VISUALC__) && defined(_NATIVE_WCHAR_T_DEFINED))
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#define wxWINT_T_IS_SEPARATE_TYPE
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#endif
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// helper macro for doing something dependent on whether wint_t is or isn't a
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// typedef inside another macro
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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#define wxIF_WINT_T_TYPE(x) x
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#else // !wxWINT_T_IS_SEPARATE_TYPE
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#define wxIF_WINT_T_TYPE(x)
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#endif // wxWINT_T_IS_SEPARATE_TYPE/!wxWINT_T_IS_SEPARATE_TYPE
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// wchar_t seems to be defined as unsigned short by all Windows compilers but
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// unsigned int everywhere else
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#ifndef __WIN32__
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#define wxWCHAR_T_IS_UINT
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#endif
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class WXDLLIMPEXP_BASE wxUniCharRef;
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// This class represents single Unicode character. It can be converted to
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// and from char or wchar_t and implements commonly used character operations.
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class WXDLLIMPEXP_BASE wxUniChar
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{
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public:
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// NB: this is not wchar_t on purpose, it needs to represent the entire
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// Unicode code points range and wchar_t may be too small for that
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// (e.g. on Win32 where wchar_t* is encoded in UTF-16)
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typedef wxUint32 value_type;
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wxUniChar() : m_value(0) {}
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// Create the character from 8bit character value encoded in the current
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// locale's charset.
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wxUniChar(char c) { m_value = From8bit(c); }
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wxUniChar(unsigned char c) { m_value = From8bit((char)c); }
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// Create the character from a wchar_t character value.
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wxUniChar(wchar_t c) { m_value = c; }
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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wxUniChar(wint_t c) { m_value = c; }
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#endif
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wxUniChar(int c) { m_value = c; }
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wxUniChar(const wxUniCharRef& c);
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// Returns Unicode code point value of the character
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value_type GetValue() const { return m_value; }
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// Conversions to char and wchar_t types: all of those are needed to be
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// able to pass wxUniChars to verious standard narrow and wide character
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// functions
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operator char() const { return To8bit(m_value); }
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operator wchar_t() const { return m_value; }
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operator int() const { return m_value; }
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#ifndef wxWCHAR_T_IS_UINT
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operator unsigned int() const { return m_value; }
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#endif
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// More conversions needed for other standard functions: uchar is for VC++
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// _mbxxx() ones (to which toxxx/isxxx() are mapped when _MBCS is defined)
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// and some wide character functions take wint_t which happens to be the
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// same as wchar_t for Windows compilers but not for g++ (except for the
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// special Apple version)
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operator unsigned char() const { return (unsigned char)To8bit(m_value); }
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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operator wint_t() const { return m_value; }
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#endif
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// We need this operator for the "*p" part of expressions like "for (
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// const_iterator p = begin() + nStart; *p; ++p )". In this case,
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// compilation would fail without it because the conversion to bool would
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// be ambiguous (there are all these int types conversions...). (And adding
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// operator unspecified_bool_type() would only makes the ambiguity worse.)
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operator bool() const { return m_value != 0; }
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bool operator!() const { return !((bool)*this); }
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#if (defined(__VISUALC__) && __VISUALC__ < 1400) || \
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defined(__DIGITALMARS__) || defined(__BORLANDC__)
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// We need this for VC++ < 8 or DigitalMars and expressions like
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// "str[0] && *p":
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bool operator&&(bool v) const { return (bool)*this && v; }
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#endif
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// Assignment operators:
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wxUniChar& operator=(const wxUniChar& c) { m_value = c.m_value; return *this; }
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wxUniChar& operator=(char c) { m_value = From8bit(c); return *this; }
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wxUniChar& operator=(wchar_t c) { m_value = c; return *this; }
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wxUniChar& operator=(int c) { m_value = c; return *this; }
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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wxUniChar& operator=(wint_t c) { m_value = c; return *this; }
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#endif
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// Comparison operators:
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// define the given comparison operator for all the types
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#define wxDEFINE_UNICHAR_OPERATOR(op) \
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bool operator op(const wxUniChar& c) const { return m_value op c.m_value; }\
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bool operator op(char c) const { return m_value op From8bit(c); } \
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bool operator op(wchar_t c) const { return m_value op (value_type)c; } \
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wxIF_WINT_T_TYPE( bool operator op(wint_t c) const { return m_value op (value_type)c; } )
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wxFOR_ALL_COMPARISONS(wxDEFINE_UNICHAR_OPERATOR)
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#undef wxDEFINE_UNICHAR_OPERATOR
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// this is needed for expressions like 'Z'-c
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int operator-(const wxUniChar& c) const { return m_value - c.m_value; }
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int operator-(char c) const { return m_value - From8bit(c); }
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int operator-(wchar_t c) const { return m_value - (value_type)c; }
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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int operator-(wint_t c) const { return m_value - (value_type)c; }
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#endif
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private:
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static value_type From8bit(char c);
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static char To8bit(value_type c);
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private:
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value_type m_value;
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};
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// Writeable reference to a character in wxString.
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//
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// This class can be used in the same way wxChar is used, except that changing
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// its value updates the underlying string object.
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class WXDLLIMPEXP_BASE wxUniCharRef
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{
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private:
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typedef wxStringImpl::iterator iterator;
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// create the reference
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wxUniCharRef(iterator pos) : m_pos(pos) {}
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public:
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// NB: we have to make this public, because we don't have wxString
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// declaration available here and so can't declare wxString::iterator
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// as friend; so at least don't use a ctor but a static function
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// that must be used explicitly (this is more than using 'explicit'
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// keyword on ctor!):
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static wxUniCharRef CreateForString(iterator pos)
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{ return wxUniCharRef(pos); }
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wxUniChar::value_type GetValue() const { return UniChar().GetValue(); }
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// Assignment operators:
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wxUniCharRef& operator=(const wxUniCharRef& c)
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{
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*m_pos = *c.m_pos;
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return *this;
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};
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wxUniCharRef& operator=(const wxUniChar& c)
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{
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*m_pos = c;
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return *this;
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};
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wxUniCharRef& operator=(char c) { return *this = wxUniChar(c); }
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wxUniCharRef& operator=(wchar_t c) { return *this = wxUniChar(c); }
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wxUniCharRef& operator=(int c) { return *this = wxUniChar(c); }
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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wxUniCharRef& operator=(wint_t c) { return *this = wxUniChar(c); }
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#endif
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// Conversions to the same types as wxUniChar is convertible too:
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operator char() const { return UniChar(); }
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operator int() const { return UniChar(); }
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operator unsigned char() const { return UniChar(); }
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operator wchar_t() const { return UniChar(); }
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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operator wint_t() const { return UniChar(); }
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#endif
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#ifndef wxWCHAR_T_IS_UINT
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operator unsigned int() const { return UniChar(); }
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#endif
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// see wxUniChar::operator bool etc. for explanation
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operator bool() const { return (bool)UniChar(); }
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bool operator!() const { return !UniChar(); }
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#if (defined(__VISUALC__) && __VISUALC__ < 1400) || \
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defined(__DIGITALMARS__) || defined(__BORLANDC__)
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bool operator&&(bool v) const { return UniChar() && v; }
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#endif
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// Comparison operators:
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#define wxDEFINE_UNICHARREF_OPERATOR(op) \
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bool operator op(const wxUniCharRef& c) const { return UniChar() op c.UniChar(); }\
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bool operator op(const wxUniChar& c) const { return UniChar() op c; } \
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bool operator op(char c) const { return UniChar() op c; } \
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bool operator op(wchar_t c) const { return UniChar() op c; } \
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wxIF_WINT_T_TYPE( bool operator op(wint_t c) const { return UniChar() op c; } )
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wxFOR_ALL_COMPARISONS(wxDEFINE_UNICHARREF_OPERATOR)
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#undef wxDEFINE_UNICHARREF_OPERATOR
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// for expressions like c-'A':
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int operator-(const wxUniCharRef& c) const { return UniChar() - c.UniChar(); }
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int operator-(const wxUniChar& c) const { return UniChar() - c; }
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int operator-(char c) const { return UniChar() - c; }
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int operator-(wchar_t c) const { return UniChar() - c; }
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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int operator-(wint_t c) const { return UniChar() - c; }
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#endif
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private:
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wxUniChar UniChar() const { return *m_pos; }
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friend class WXDLLIMPEXP_BASE wxUniChar;
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private:
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// pointer to the character in string
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iterator m_pos;
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};
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inline wxUniChar::wxUniChar(const wxUniCharRef& c)
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{
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m_value = c.UniChar().m_value;
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}
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// Comparison operators for the case when wxUniChar(Ref) is the second operand
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// implemented in terms of member comparison functions
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#define wxCMP_REVERSE(c1, c2, op) c2 op c1
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wxDEFINE_COMPARISONS(char, const wxUniChar&, wxCMP_REVERSE)
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wxDEFINE_COMPARISONS(char, const wxUniCharRef&, wxCMP_REVERSE)
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wxDEFINE_COMPARISONS(wchar_t, const wxUniChar&, wxCMP_REVERSE)
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wxDEFINE_COMPARISONS(wchar_t, const wxUniCharRef&, wxCMP_REVERSE)
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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wxDEFINE_COMPARISONS(wint_t, const wxUniChar&, wxCMP_REVERSE)
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wxDEFINE_COMPARISONS(wint_t, const wxUniCharRef&, wxCMP_REVERSE)
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#endif
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wxDEFINE_COMPARISONS(const wxUniChar&, const wxUniCharRef&, wxCMP_REVERSE)
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#undef wxCMP_REVERSE
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// for expressions like c-'A':
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inline int operator-(char c1, const wxUniCharRef& c2) { return -(c2 - c1); }
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inline int operator-(const wxUniChar& c1, const wxUniCharRef& c2) { return -(c2 - c1); }
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inline int operator-(wchar_t c1, const wxUniCharRef& c2) { return -(c2 - c1); }
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#ifdef wxWINT_T_IS_SEPARATE_TYPE
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inline int operator-(wint_t c1, const wxUniCharRef& c2) { return -(c2 - c1); }
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#endif
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#endif /* _WX_UNICHAR_H_ */
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