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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is mozilla.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Scott Collins <scc@mozilla.org> (original author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsCharTraits_h___
+#define nsCharTraits_h___
+
+#include <ctype.h>
+ // for |EOF|, |WEOF|
+
+#define FORCED_CPP_2BYTE_WCHAR_T
+ // disable special optimizations for now through this hack
+
+#if defined(HAVE_CPP_2BYTE_WCHAR_T) && !defined(FORCED_CPP_2BYTE_WCHAR_T)
+#define USE_CPP_WCHAR_FUNCS
+#endif
+
+#ifdef USE_CPP_WCHAR_FUNCS
+#include <wchar.h>
+ // for |wmemset|, et al
+#endif
+
+#include <string.h>
+ // for |memcpy|, et al
+
+#ifndef nscore_h___
+#include "nscore.h"
+ // for |PRUnichar|
+#endif
+
+#ifndef nsDebug_h__
+#include "nsDebug.h"
+ // for NS_ASSERTION
+#endif
+
+#ifdef HAVE_CPP_BOOL
+ typedef bool nsCharTraits_bool;
+#else
+ typedef PRBool nsCharTraits_bool;
+#endif
+
+template <class CharT> struct nsCharTraits {};
+
+NS_SPECIALIZE_TEMPLATE
+struct nsCharTraits<PRUnichar>
+ {
+ typedef PRUnichar char_type;
+ typedef PRUint16 unsigned_char_type;
+ typedef char incompatible_char_type;
+
+ NS_COM static const char_type *sEmptyBuffer;
+
+ static
+ void
+ assign( char_type& lhs, char_type rhs )
+ {
+ lhs = rhs;
+ }
+
+
+ // integer representation of characters:
+
+#ifdef USE_CPP_WCHAR_FUNCS
+ typedef wint_t int_type;
+#else
+ typedef int int_type;
+#endif
+
+ static
+ char_type
+ to_char_type( int_type c )
+ {
+ return char_type(c);
+ }
+
+ static
+ int_type
+ to_int_type( char_type c )
+ {
+ return int_type( NS_STATIC_CAST(unsigned_char_type, c) );
+ }
+
+ static
+ nsCharTraits_bool
+ eq_int_type( int_type lhs, int_type rhs )
+ {
+ return lhs == rhs;
+ }
+
+
+ // |char_type| comparisons:
+
+ static
+ nsCharTraits_bool
+ eq( char_type lhs, char_type rhs )
+ {
+ return lhs == rhs;
+ }
+
+ static
+ nsCharTraits_bool
+ lt( char_type lhs, char_type rhs )
+ {
+ return lhs < rhs;
+ }
+
+
+ // operations on s[n] arrays:
+
+ static
+ char_type*
+ move( char_type* s1, const char_type* s2, size_t n )
+ {
+ return NS_STATIC_CAST(char_type*, memmove(s1, s2, n * sizeof(char_type)));
+ }
+
+ static
+ char_type*
+ copy( char_type* s1, const char_type* s2, size_t n )
+ {
+ return NS_STATIC_CAST(char_type*, memcpy(s1, s2, n * sizeof(char_type)));
+ }
+
+ static
+ char_type*
+ copyASCII( char_type* s1, const char* s2, size_t n )
+ {
+ for (char_type* s = s1; n--; ++s, ++s2) {
+ NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
+ *s = *s2;
+ }
+ return s1;
+ }
+
+ static
+ char_type*
+ assign( char_type* s, size_t n, char_type c )
+ {
+#ifdef USE_CPP_WCHAR_FUNCS
+ return NS_STATIC_CAST(char_type*, wmemset(s, to_int_type(c), n));
+#else
+ char_type* result = s;
+ while ( n-- )
+ assign(*s++, c);
+ return result;
+#endif
+ }
+
+ static
+ int
+ compare( const char_type* s1, const char_type* s2, size_t n )
+ {
+#ifdef USE_CPP_WCHAR_FUNCS
+ return wmemcmp(s1, s2, n);
+#else
+ for ( ; n--; ++s1, ++s2 )
+ {
+ if ( !eq(*s1, *s2) )
+ return to_int_type(*s1) - to_int_type(*s2);
+ }
+
+ return 0;
+#endif
+ }
+
+ static
+ int
+ compareASCII( const char_type* s1, const char* s2, size_t n )
+ {
+ for ( ; n--; ++s1, ++s2 )
+ {
+ NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
+ if ( !eq_int_type(to_int_type(*s1), to_int_type(*s2)) )
+ return to_int_type(*s1) - to_int_type(*s2);
+ }
+
+ return 0;
+ }
+
+ // this version assumes that s2 is null-terminated and s1 has length n.
+ // if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
+ // we return 1.
+ static
+ int
+ compareASCIINullTerminated( const char_type* s1, size_t n, const char* s2 )
+ {
+ for ( ; n--; ++s1, ++s2 )
+ {
+ if ( !*s2 )
+ return 1;
+ NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
+ if ( !eq_int_type(to_int_type(*s1), to_int_type(*s2)) )
+ return to_int_type(*s1) - to_int_type(*s2);
+ }
+
+ if ( *s2 )
+ return -1;
+
+ return 0;
+ }
+
+ /**
+ * Convert c to its lower-case form, but only if the lower-case form is
+ * ASCII. Otherwise leave it alone.
+ *
+ * There are only two non-ASCII Unicode characters whose lowercase
+ * equivalents are ASCII: KELVIN SIGN and LATIN CAPITAL LETTER I WITH
+ * DOT ABOVE. So it's a simple matter to handle those explicitly.
+ */
+ static
+ char_type
+ ASCIIToLower( char_type c )
+ {
+ if (c < 0x100)
+ return (c >= 'A' && c <= 'Z') ? c + ('a' - 'A') : c;
+ else
+ {
+ if (c == 0x212A) // KELVIN SIGN
+ return 'k';
+ if (c == 0x0130) // LATIN CAPITAL LETTER I WITH DOT ABOVE
+ return 'i';
+ return c;
+ }
+ }
+
+ static
+ int
+ compareLowerCaseToASCII( const char_type* s1, const char* s2, size_t n )
+ {
+ for ( ; n--; ++s1, ++s2 )
+ {
+ NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
+ NS_ASSERTION(!(*s2 >= 'A' && *s2 <= 'Z'),
+ "Unexpected uppercase character");
+ char_type lower_s1 = ASCIIToLower(*s1);
+ if ( lower_s1 != to_char_type(*s2) )
+ return to_int_type(lower_s1) - to_int_type(*s2);
+ }
+
+ return 0;
+ }
+
+ // this version assumes that s2 is null-terminated and s1 has length n.
+ // if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
+ // we return 1.
+ static
+ int
+ compareLowerCaseToASCIINullTerminated( const char_type* s1, size_t n, const char* s2 )
+ {
+ for ( ; n--; ++s1, ++s2 )
+ {
+ if ( !*s2 )
+ return 1;
+ NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
+ NS_ASSERTION(!(*s2 >= 'A' && *s2 <= 'Z'),
+ "Unexpected uppercase character");
+ char_type lower_s1 = ASCIIToLower(*s1);
+ if ( lower_s1 != to_char_type(*s2) )
+ return to_int_type(lower_s1) - to_int_type(*s2);
+ }
+
+ if ( *s2 )
+ return -1;
+
+ return 0;
+ }
+
+ static
+ size_t
+ length( const char_type* s )
+ {
+#ifdef USE_CPP_WCHAR_FUNCS
+ return wcslen(s);
+#else
+ size_t result = 0;
+ while ( !eq(*s++, char_type(0)) )
+ ++result;
+ return result;
+#endif
+ }
+
+ static
+ const char_type*
+ find( const char_type* s, size_t n, char_type c )
+ {
+#ifdef USE_CPP_WCHAR_FUNCS
+ return NS_REINTERPRET_CAST(const char_type*, wmemchr(s, to_int_type(c), n));
+#else
+ while ( n-- )
+ {
+ if ( eq(*s, c) )
+ return s;
+ ++s;
+ }
+
+ return 0;
+#endif
+ }
+
+#if 0
+ // I/O related:
+
+ typedef streamoff off_type;
+ typedef streampos pos_type;
+ typedef mbstate_t state_type;
+
+ static
+ int_type
+ eof()
+ {
+#ifdef USE_CPP_WCHAR_FUNCS
+ return WEOF;
+#else
+ return EOF;
+#endif
+ }
+
+ static
+ int_type
+ not_eof( int_type c )
+ {
+ return eq_int_type(c, eof()) ? ~eof() : c;
+ }
+
+ // static state_type get_state( pos_type );
+#endif
+ };
+
+NS_SPECIALIZE_TEMPLATE
+struct nsCharTraits<char>
+ {
+ typedef char char_type;
+ typedef unsigned char unsigned_char_type;
+ typedef PRUnichar incompatible_char_type;
+
+ NS_COM static const char_type *sEmptyBuffer;
+
+ static
+ void
+ assign( char_type& lhs, char_type rhs )
+ {
+ lhs = rhs;
+ }
+
+
+ // integer representation of characters:
+
+ typedef int int_type;
+
+ static
+ char_type
+ to_char_type( int_type c )
+ {
+ return char_type(c);
+ }
+
+ static
+ int_type
+ to_int_type( char_type c )
+ {
+ return int_type( NS_STATIC_CAST(unsigned_char_type, c) );
+ }
+
+ static
+ nsCharTraits_bool
+ eq_int_type( int_type lhs, int_type rhs )
+ {
+ return lhs == rhs;
+ }
+
+
+ // |char_type| comparisons:
+
+ static
+ nsCharTraits_bool
+ eq( char_type lhs, char_type rhs )
+ {
+ return lhs == rhs;
+ }
+
+ static
+ nsCharTraits_bool
+ lt( char_type lhs, char_type rhs )
+ {
+ return lhs < rhs;
+ }
+
+
+ // operations on s[n] arrays:
+
+ static
+ char_type*
+ move( char_type* s1, const char_type* s2, size_t n )
+ {
+ return NS_STATIC_CAST(char_type*, memmove(s1, s2, n * sizeof(char_type)));
+ }
+
+ static
+ char_type*
+ copy( char_type* s1, const char_type* s2, size_t n )
+ {
+ return NS_STATIC_CAST(char_type*, memcpy(s1, s2, n * sizeof(char_type)));
+ }
+
+ static
+ char_type*
+ copyASCII( char_type* s1, const char* s2, size_t n )
+ {
+ return copy(s1, s2, n);
+ }
+
+ static
+ char_type*
+ assign( char_type* s, size_t n, char_type c )
+ {
+ return NS_STATIC_CAST(char_type*, memset(s, to_int_type(c), n));
+ }
+
+ static
+ int
+ compare( const char_type* s1, const char_type* s2, size_t n )
+ {
+ return memcmp(s1, s2, n);
+ }
+
+ static
+ int
+ compareASCII( const char_type* s1, const char* s2, size_t n )
+ {
+#ifdef DEBUG
+ for (size_t i = 0; i < n; ++i)
+ {
+ NS_ASSERTION(!(s2[i] & ~0x7F), "Unexpected non-ASCII character");
+ }
+#endif
+ return compare(s1, s2, n);
+ }
+
+ // this version assumes that s2 is null-terminated and s1 has length n.
+ // if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
+ // we return 1.
+ static
+ int
+ compareASCIINullTerminated( const char_type* s1, size_t n, const char* s2 )
+ {
+ // can't use strcmp here because we don't want to stop when s1
+ // contains a null
+ for ( ; n--; ++s1, ++s2 )
+ {
+ if ( !*s2 )
+ return 1;
+ NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
+ if ( *s1 != *s2 )
+ return to_int_type(*s1) - to_int_type(*s2);
+ }
+
+ if ( *s2 )
+ return -1;
+
+ return 0;
+ }
+
+ /**
+ * Convert c to its lower-case form, but only if c is ASCII.
+ */
+ static
+ char_type
+ ASCIIToLower( char_type c )
+ {
+ return (c >= 'A' && c <= 'Z') ? (c + ('a' - 'A')) : c;
+ }
+
+ static
+ int
+ compareLowerCaseToASCII( const char_type* s1, const char* s2, size_t n )
+ {
+ for ( ; n--; ++s1, ++s2 )
+ {
+ NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
+ NS_ASSERTION(!(*s2 >= 'A' && *s2 <= 'Z'),
+ "Unexpected uppercase character");
+ char_type lower_s1 = ASCIIToLower(*s1);
+ if ( lower_s1 != *s2 )
+ return to_int_type(lower_s1) - to_int_type(*s2);
+ }
+ return 0;
+ }
+
+ // this version assumes that s2 is null-terminated and s1 has length n.
+ // if s1 is shorter than s2 then we return -1; if s1 is longer than s2,
+ // we return 1.
+ static
+ int
+ compareLowerCaseToASCIINullTerminated( const char_type* s1, size_t n, const char* s2 )
+ {
+ for ( ; n--; ++s1, ++s2 )
+ {
+ if ( !*s2 )
+ return 1;
+ NS_ASSERTION(!(*s2 & ~0x7F), "Unexpected non-ASCII character");
+ NS_ASSERTION(!(*s2 >= 'A' && *s2 <= 'Z'),
+ "Unexpected uppercase character");
+ char_type lower_s1 = ASCIIToLower(*s1);
+ if ( lower_s1 != *s2 )
+ return to_int_type(lower_s1) - to_int_type(*s2);
+ }
+
+ if ( *s2 )
+ return -1;
+
+ return 0;
+ }
+
+ static
+ size_t
+ length( const char_type* s )
+ {
+ return strlen(s);
+ }
+
+ static
+ const char_type*
+ find( const char_type* s, size_t n, char_type c )
+ {
+ return NS_REINTERPRET_CAST(const char_type*, memchr(s, to_int_type(c), n));
+ }
+
+#if 0
+ // I/O related:
+
+ typedef streamoff off_type;
+ typedef streampos pos_type;
+ typedef mbstate_t state_type;
+
+ static
+ int_type
+ eof()
+ {
+ return EOF;
+ }
+
+ static
+ int_type
+ not_eof( int_type c )
+ {
+ return eq_int_type(c, eof()) ? ~eof() : c;
+ }
+
+ // static state_type get_state( pos_type );
+#endif
+ };
+
+template <class InputIterator>
+struct nsCharSourceTraits
+ {
+ typedef typename InputIterator::difference_type difference_type;
+
+ static
+ PRUint32
+ readable_distance( const InputIterator& first, const InputIterator& last )
+ {
+ // assumes single fragment
+ return last.get() - first.get();
+ }
+
+ static
+ const typename InputIterator::value_type*
+ read( const InputIterator& iter )
+ {
+ return iter.get();
+ }
+
+ static
+ void
+ advance( InputIterator& s, difference_type n )
+ {
+ s.advance(n);
+ }
+ };
+
+#ifdef HAVE_CPP_PARTIAL_SPECIALIZATION
+
+template <class CharT>
+struct nsCharSourceTraits<CharT*>
+ {
+ typedef ptrdiff_t difference_type;
+
+ static
+ PRUint32
+ readable_distance( CharT* s )
+ {
+ return PRUint32(nsCharTraits<CharT>::length(s));
+// return numeric_limits<PRUint32>::max();
+ }
+
+ static
+ PRUint32
+ readable_distance( CharT* first, CharT* last )
+ {
+ return PRUint32(last-first);
+ }
+
+ static
+ const CharT*
+ read( CharT* s )
+ {
+ return s;
+ }
+
+ static
+ void
+ advance( CharT*& s, difference_type n )
+ {
+ s += n;
+ }
+ };
+
+#else
+
+NS_SPECIALIZE_TEMPLATE
+struct nsCharSourceTraits<const char*>
+ {
+ typedef ptrdiff_t difference_type;
+
+ static
+ PRUint32
+ readable_distance( const char* s )
+ {
+ return PRUint32(nsCharTraits<char>::length(s));
+// return numeric_limits<PRUint32>::max();
+ }
+
+ static
+ PRUint32
+ readable_distance( const char* first, const char* last )
+ {
+ return PRUint32(last-first);
+ }
+
+ static
+ const char*
+ read( const char* s )
+ {
+ return s;
+ }
+
+ static
+ void
+ advance( const char*& s, difference_type n )
+ {
+ s += n;
+ }
+ };
+
+
+NS_SPECIALIZE_TEMPLATE
+struct nsCharSourceTraits<const PRUnichar*>
+ {
+ typedef ptrdiff_t difference_type;
+
+ static
+ PRUint32
+ readable_distance( const PRUnichar* s )
+ {
+ return PRUint32(nsCharTraits<PRUnichar>::length(s));
+// return numeric_limits<PRUint32>::max();
+ }
+
+ static
+ PRUint32
+ readable_distance( const PRUnichar* first, const PRUnichar* last )
+ {
+ return PRUint32(last-first);
+ }
+
+ static
+ const PRUnichar*
+ read( const PRUnichar* s )
+ {
+ return s;
+ }
+
+ static
+ void
+ advance( const PRUnichar*& s, difference_type n )
+ {
+ s += n;
+ }
+ };
+
+#endif
+
+
+template <class OutputIterator>
+struct nsCharSinkTraits
+ {
+ static
+ PRUint32
+ write( OutputIterator& iter, const typename OutputIterator::value_type* s, PRUint32 n )
+ {
+ return iter.write(s, n);
+ }
+ };
+
+#ifdef HAVE_CPP_PARTIAL_SPECIALIZATION
+
+template <class CharT>
+struct nsCharSinkTraits<CharT*>
+ {
+ static
+ PRUint32
+ write( CharT*& iter, const CharT* s, PRUint32 n )
+ {
+ nsCharTraits<CharT>::move(iter, s, n);
+ iter += n;
+ return n;
+ }
+ };
+
+#else
+
+NS_SPECIALIZE_TEMPLATE
+struct nsCharSinkTraits<char*>
+ {
+ static
+ PRUint32
+ write( char*& iter, const char* s, PRUint32 n )
+ {
+ nsCharTraits<char>::move(iter, s, n);
+ iter += n;
+ return n;
+ }
+ };
+
+NS_SPECIALIZE_TEMPLATE
+struct nsCharSinkTraits<PRUnichar*>
+ {
+ static
+ PRUint32
+ write( PRUnichar*& iter, const PRUnichar* s, PRUint32 n )
+ {
+ nsCharTraits<PRUnichar>::move(iter, s, n);
+ iter += n;
+ return n;
+ }
+ };
+
+#endif
+
+#endif // !defined(nsCharTraits_h___)
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