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gecko/xpcom/string/public/nsReadableUtils.h

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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)
* Johnny Stenbeck <jst@netscape.com>
*
* 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 nsReadableUtils_h___
#define nsReadableUtils_h___
/**
* I guess all the routines in this file are all mis-named.
* According to our conventions, they should be |NS_xxx|.
*/
#ifndef nsAString_h___
#include "nsAString.h"
#endif
#include "nsTArray.h"
inline size_t Distance( const nsReadingIterator<PRUnichar>& start, const nsReadingIterator<PRUnichar>& end )
{
return end.get() - start.get();
}
inline size_t Distance( const nsReadingIterator<char>& start, const nsReadingIterator<char>& end )
{
return end.get() - start.get();
}
NS_COM void LossyCopyUTF16toASCII( const nsAString& aSource, nsACString& aDest NS_OUTPARAM );
NS_COM void CopyASCIItoUTF16( const nsACString& aSource, nsAString& aDest NS_OUTPARAM );
NS_COM void LossyCopyUTF16toASCII( const PRUnichar* aSource, nsACString& aDest NS_OUTPARAM );
NS_COM void CopyASCIItoUTF16( const char* aSource, nsAString& aDest NS_OUTPARAM );
NS_COM void CopyUTF16toUTF8( const nsAString& aSource, nsACString& aDest NS_OUTPARAM );
NS_COM void CopyUTF8toUTF16( const nsACString& aSource, nsAString& aDest NS_OUTPARAM );
NS_COM void CopyUTF16toUTF8( const PRUnichar* aSource, nsACString& aDest NS_OUTPARAM );
NS_COM void CopyUTF8toUTF16( const char* aSource, nsAString& aDest NS_OUTPARAM );
NS_COM void LossyAppendUTF16toASCII( const nsAString& aSource, nsACString& aDest );
NS_COM void AppendASCIItoUTF16( const nsACString& aSource, nsAString& aDest );
NS_COM void LossyAppendUTF16toASCII( const PRUnichar* aSource, nsACString& aDest );
NS_COM void AppendASCIItoUTF16( const char* aSource, nsAString& aDest );
NS_COM void AppendUTF16toUTF8( const nsAString& aSource, nsACString& aDest );
NS_COM void AppendUTF8toUTF16( const nsACString& aSource, nsAString& aDest );
NS_COM void AppendUTF16toUTF8( const PRUnichar* aSource, nsACString& aDest );
NS_COM void AppendUTF8toUTF16( const char* aSource, nsAString& aDest );
/**
* Returns a new |char| buffer containing a zero-terminated copy of |aSource|.
*
* Allocates and returns a new |char| buffer which you must free with |nsMemory::Free|.
* Performs a lossy encoding conversion by chopping 16-bit wide characters down to 8-bits wide while copying |aSource| to your new buffer.
* This conversion is not well defined; but it reproduces legacy string behavior.
* The new buffer is zero-terminated, but that may not help you if |aSource| contains embedded nulls.
*
* @param aSource a 16-bit wide string
* @return a new |char| buffer you must free with |nsMemory::Free|.
*/
NS_COM char* ToNewCString( const nsAString& aSource );
/**
* Returns a new |char| buffer containing a zero-terminated copy of |aSource|.
*
* Allocates and returns a new |char| buffer which you must free with |nsMemory::Free|.
* The new buffer is zero-terminated, but that may not help you if |aSource| contains embedded nulls.
*
* @param aSource an 8-bit wide string
* @return a new |char| buffer you must free with |nsMemory::Free|.
*/
NS_COM char* ToNewCString( const nsACString& aSource );
/**
* Returns a new |char| buffer containing a zero-terminated copy of |aSource|.
*
* Allocates and returns a new |char| buffer which you must free with
* |nsMemory::Free|.
* Performs an encoding conversion from a UTF-16 string to a UTF-8 string
* copying |aSource| to your new buffer.
* The new buffer is zero-terminated, but that may not help you if |aSource|
* contains embedded nulls.
*
* @param aSource a UTF-16 string (made of PRUnichar's)
* @param aUTF8Count the number of 8-bit units that was returned
* @return a new |char| buffer you must free with |nsMemory::Free|.
*/
NS_COM char* ToNewUTF8String( const nsAString& aSource, PRUint32 *aUTF8Count = nsnull );
/**
* Returns a new |PRUnichar| buffer containing a zero-terminated copy of
* |aSource|.
*
* Allocates and returns a new |PRUnichar| buffer which you must free with
* |nsMemory::Free|.
* The new buffer is zero-terminated, but that may not help you if |aSource|
* contains embedded nulls.
*
* @param aSource a UTF-16 string
* @return a new |PRUnichar| buffer you must free with |nsMemory::Free|.
*/
NS_COM PRUnichar* ToNewUnicode( const nsAString& aSource );
/**
* Returns a new |PRUnichar| buffer containing a zero-terminated copy of |aSource|.
*
* Allocates and returns a new |PRUnichar| buffer which you must free with |nsMemory::Free|.
* Performs an encoding conversion by 0-padding 8-bit wide characters up to 16-bits wide while copying |aSource| to your new buffer.
* This conversion is not well defined; but it reproduces legacy string behavior.
* The new buffer is zero-terminated, but that may not help you if |aSource| contains embedded nulls.
*
* @param aSource an 8-bit wide string (a C-string, NOT UTF-8)
* @return a new |PRUnichar| buffer you must free with |nsMemory::Free|.
*/
NS_COM PRUnichar* ToNewUnicode( const nsACString& aSource );
/**
* Returns a new |PRUnichar| buffer containing a zero-terminated copy
* of |aSource|.
*
* Allocates and returns a new |char| buffer which you must free with
* |nsMemory::Free|. Performs an encoding conversion from UTF-8 to UTF-16
* while copying |aSource| to your new buffer. This conversion is well defined
* for a valid UTF-8 string. The new buffer is zero-terminated, but that
* may not help you if |aSource| contains embedded nulls.
*
* @param aSource an 8-bit wide string, UTF-8 encoded
* @param aUTF16Count the number of 16-bit units that was returned
* @return a new |PRUnichar| buffer you must free with |nsMemory::Free|.
* (UTF-16 encoded)
*/
NS_COM PRUnichar* UTF8ToNewUnicode( const nsACString& aSource, PRUint32 *aUTF16Count = nsnull );
/**
* Copies |aLength| 16-bit code units from the start of |aSource| to the
* |PRUnichar| buffer |aDest|.
*
* After this operation |aDest| is not null terminated.
*
* @param aSource a UTF-16 string
* @param aSrcOffset start offset in the source string
* @param aDest a |PRUnichar| buffer
* @param aLength the number of 16-bit code units to copy
* @return pointer to destination buffer - identical to |aDest|
*/
NS_COM PRUnichar* CopyUnicodeTo( const nsAString& aSource,
PRUint32 aSrcOffset,
PRUnichar* aDest,
PRUint32 aLength );
/**
* Copies 16-bit characters between iterators |aSrcStart| and
* |aSrcEnd| to the writable string |aDest|. Similar to the
* |nsString::Mid| method.
*
* After this operation |aDest| is not null terminated.
*
* @param aSrcStart start source iterator
* @param aSrcEnd end source iterator
* @param aDest destination for the copy
*/
NS_COM void CopyUnicodeTo( const nsAString::const_iterator& aSrcStart,
const nsAString::const_iterator& aSrcEnd,
nsAString& aDest );
/**
* Appends 16-bit characters between iterators |aSrcStart| and
* |aSrcEnd| to the writable string |aDest|.
*
* After this operation |aDest| is not null terminated.
*
* @param aSrcStart start source iterator
* @param aSrcEnd end source iterator
* @param aDest destination for the copy
*/
NS_COM void AppendUnicodeTo( const nsAString::const_iterator& aSrcStart,
const nsAString::const_iterator& aSrcEnd,
nsAString& aDest );
/**
* Returns |PR_TRUE| if |aString| contains only ASCII characters, that is, characters in the range (0x00, 0x7F).
*
* @param aString a 16-bit wide string to scan
*/
NS_COM PRBool IsASCII( const nsAString& aString );
/**
* Returns |PR_TRUE| if |aString| contains only ASCII characters, that is, characters in the range (0x00, 0x7F).
*
* @param aString a 8-bit wide string to scan
*/
NS_COM PRBool IsASCII( const nsACString& aString );
/**
* Returns |PR_TRUE| if |aString| is a valid UTF-8 string.
* XXX This is not bullet-proof and nor an all-purpose UTF-8 validator.
* It is mainly written to replace and roughly equivalent to
*
* str.Equals(NS_ConvertUTF16toUTF8(NS_ConvertUTF8toUTF16(str)))
*
* (see bug 191541)
* As such, it does not check for non-UTF-8 7bit encodings such as
* ISO-2022-JP and HZ. However, it filters out UTF-8 representation
* of surrogate codepoints and non-characters ( 0xFFFE and 0xFFFF
* in planes 0 through 16.) as well as overlong UTF-8 sequences.
* Also note that it regards UTF-8 sequences corresponding to
* codepoints above 0x10FFFF as invalid in accordance with
* http://www.ietf.org/internet-drafts/draft-yergeau-rfc2279bis-04.txt
*
* @param aString an 8-bit wide string to scan
*/
NS_COM PRBool IsUTF8( const nsACString& aString );
NS_COM PRBool ParseString(const nsACString& aAstring, char aDelimiter,
nsTArray<nsCString>& aArray);
/**
* Converts case in place in the argument string.
*/
NS_COM void ToUpperCase( nsACString& );
NS_COM void ToLowerCase( nsACString& );
NS_COM void ToUpperCase( nsCSubstring& );
NS_COM void ToLowerCase( nsCSubstring& );
/**
* Converts case from string aSource to aDest.
*/
NS_COM void ToUpperCase( const nsACString& aSource, nsACString& aDest );
NS_COM void ToLowerCase( const nsACString& aSource, nsACString& aDest );
/**
* Finds the leftmost occurrence of |aPattern|, if any in the range |aSearchStart|..|aSearchEnd|.
*
* Returns |PR_TRUE| if a match was found, and adjusts |aSearchStart| and |aSearchEnd| to
* point to the match. If no match was found, returns |PR_FALSE| and makes |aSearchStart == aSearchEnd|.
*
* Currently, this is equivalent to the O(m*n) implementation previously on |ns[C]String|.
* If we need something faster, then we can implement that later.
*/
NS_COM PRBool FindInReadable( const nsAString& aPattern, nsAString::const_iterator&, nsAString::const_iterator&, const nsStringComparator& = nsDefaultStringComparator() );
NS_COM PRBool FindInReadable( const nsACString& aPattern, nsACString::const_iterator&, nsACString::const_iterator&, const nsCStringComparator& = nsDefaultCStringComparator() );
/* sometimes we don't care about where the string was, just that we
* found it or not */
inline PRBool FindInReadable( const nsAString& aPattern, const nsAString& aSource, const nsStringComparator& compare = nsDefaultStringComparator() )
{
nsAString::const_iterator start, end;
aSource.BeginReading(start);
aSource.EndReading(end);
return FindInReadable(aPattern, start, end, compare);
}
inline PRBool FindInReadable( const nsACString& aPattern, const nsACString& aSource, const nsCStringComparator& compare = nsDefaultCStringComparator() )
{
nsACString::const_iterator start, end;
aSource.BeginReading(start);
aSource.EndReading(end);
return FindInReadable(aPattern, start, end, compare);
}
NS_COM PRBool CaseInsensitiveFindInReadable( const nsACString& aPattern, nsACString::const_iterator&, nsACString::const_iterator& );
/**
* Finds the rightmost occurrence of |aPattern|
* Returns |PR_TRUE| if a match was found, and adjusts |aSearchStart| and |aSearchEnd| to
* point to the match. If no match was found, returns |PR_FALSE| and makes |aSearchStart == aSearchEnd|.
*
*/
NS_COM PRBool RFindInReadable( const nsAString& aPattern, nsAString::const_iterator&, nsAString::const_iterator&, const nsStringComparator& = nsDefaultStringComparator() );
NS_COM PRBool RFindInReadable( const nsACString& aPattern, nsACString::const_iterator&, nsACString::const_iterator&, const nsCStringComparator& = nsDefaultCStringComparator() );
/**
* Finds the leftmost occurrence of |aChar|, if any in the range
* |aSearchStart|..|aSearchEnd|.
*
* Returns |PR_TRUE| if a match was found, and adjusts |aSearchStart| to
* point to the match. If no match was found, returns |PR_FALSE| and
* makes |aSearchStart == aSearchEnd|.
*/
NS_COM PRBool FindCharInReadable( PRUnichar aChar, nsAString::const_iterator& aSearchStart, const nsAString::const_iterator& aSearchEnd );
NS_COM PRBool FindCharInReadable( char aChar, nsACString::const_iterator& aSearchStart, const nsACString::const_iterator& aSearchEnd );
/**
* Finds the number of occurences of |aChar| in the string |aStr|
*/
NS_COM PRUint32 CountCharInReadable( const nsAString& aStr,
PRUnichar aChar );
NS_COM PRUint32 CountCharInReadable( const nsACString& aStr,
char aChar );
NS_COM PRBool
StringBeginsWith( const nsAString& aSource, const nsAString& aSubstring,
const nsStringComparator& aComparator =
nsDefaultStringComparator() );
NS_COM PRBool
StringBeginsWith( const nsACString& aSource, const nsACString& aSubstring,
const nsCStringComparator& aComparator =
nsDefaultCStringComparator() );
NS_COM PRBool
StringEndsWith( const nsAString& aSource, const nsAString& aSubstring,
const nsStringComparator& aComparator =
nsDefaultStringComparator() );
NS_COM PRBool
StringEndsWith( const nsACString& aSource, const nsACString& aSubstring,
const nsCStringComparator& aComparator =
nsDefaultCStringComparator() );
NS_COM const nsAFlatString& EmptyString();
NS_COM const nsAFlatCString& EmptyCString();
/**
* Compare a UTF-8 string to an UTF-16 string.
*
* Returns 0 if the strings are equal, -1 if aUTF8String is less
* than aUTF16Count, and 1 in the reverse case. In case of fatal
* error (eg the strings are not valid UTF8 and UTF16 respectively),
* this method will return PR_INT32_MIN.
*/
NS_COM PRInt32
CompareUTF8toUTF16(const nsASingleFragmentCString& aUTF8String,
const nsASingleFragmentString& aUTF16String);
NS_COM void
AppendUCS4ToUTF16(const PRUint32 aSource, nsAString& aDest);
template<class T>
inline PRBool EnsureStringLength(T& aStr, PRUint32 aLen)
{
aStr.SetLength(aLen);
return (aStr.Length() == aLen);
}
#endif // !defined(nsReadableUtils_h___)
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