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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 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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
template<class E> class nsTArray;
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();
}
void LossyCopyUTF16toASCII( const nsAString& aSource, nsACString& aDest );
void CopyASCIItoUTF16( const nsACString& aSource, nsAString& aDest );
void LossyCopyUTF16toASCII( const PRUnichar* aSource, nsACString& aDest );
void CopyASCIItoUTF16( const char* aSource, nsAString& aDest );
void CopyUTF16toUTF8( const nsAString& aSource, nsACString& aDest );
void CopyUTF8toUTF16( const nsACString& aSource, nsAString& aDest );
void CopyUTF16toUTF8( const PRUnichar* aSource, nsACString& aDest );
void CopyUTF8toUTF16( const char* aSource, nsAString& aDest );
void LossyAppendUTF16toASCII( const nsAString& aSource, nsACString& aDest );
void AppendASCIItoUTF16( const nsACString& aSource, nsAString& aDest );
void LossyAppendUTF16toASCII( const PRUnichar* aSource, nsACString& aDest );
void AppendASCIItoUTF16( const char* aSource, nsAString& aDest );
void AppendUTF16toUTF8( const nsAString& aSource, nsACString& aDest );
void AppendUTF8toUTF16( const nsACString& aSource, nsAString& aDest );
bool AppendUTF8toUTF16( const nsACString& aSource, nsAString& aDest,
const mozilla::fallible_t& ) NS_WARN_UNUSED_RESULT;
void AppendUTF16toUTF8( const PRUnichar* aSource, nsACString& aDest );
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|.
*/
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|.
*/
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|.
*/
char* ToNewUTF8String( const nsAString& aSource, uint32_t *aUTF8Count = nullptr );
/**
* 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|.
*/
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|.
*/
PRUnichar* ToNewUnicode( const nsACString& aSource );
/**
* Returns the required length for a PRUnichar buffer holding
* a copy of aSource, using UTF-8 to UTF-16 conversion.
* The length does NOT include any space for zero-termination.
*
* @param aSource an 8-bit wide string, UTF-8 encoded
* @return length of UTF-16 encoded string copy, not zero-terminated
*/
uint32_t CalcUTF8ToUnicodeLength( const nsACString& aSource );
/**
* Copies the source string into the specified buffer, converting UTF-8 to
* UTF-16 in the process. The conversion is well defined for valid UTF-8
* strings.
* The copied string will be zero-terminated! Any embedded nulls will be
* copied nonetheless. It is the caller's responsiblity to ensure the buffer
* is large enough to hold the string copy plus one PRUnichar for
* zero-termination!
*
* @see CalcUTF8ToUnicodeLength( const nsACString& )
* @see UTF8ToNewUnicode( const nsACString&, uint32_t* )
*
* @param aSource an 8-bit wide string, UTF-8 encoded
* @param aBuffer the buffer holding the converted string copy
* @param aUTF16Count receiving optionally the number of 16-bit units that
* were copied
* @return aBuffer pointer, for convenience
*/
PRUnichar* UTF8ToUnicodeBuffer( const nsACString& aSource,
PRUnichar *aBuffer,
uint32_t *aUTF16Count = nullptr );
/**
* 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)
*/
PRUnichar* UTF8ToNewUnicode( const nsACString& aSource, uint32_t *aUTF16Count = nullptr );
/**
* 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|
*/
PRUnichar* CopyUnicodeTo( const nsAString& aSource,
uint32_t aSrcOffset,
PRUnichar* aDest,
uint32_t 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
*/
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
*/
void AppendUnicodeTo( const nsAString::const_iterator& aSrcStart,
const nsAString::const_iterator& aSrcEnd,
nsAString& aDest );
/**
* Returns |true| if |aString| contains only ASCII characters, that is, characters in the range (0x00, 0x7F).
*
* @param aString a 16-bit wide string to scan
*/
bool IsASCII( const nsAString& aString );
/**
* Returns |true| if |aString| contains only ASCII characters, that is, characters in the range (0x00, 0x7F).
*
* @param aString a 8-bit wide string to scan
*/
bool IsASCII( const nsACString& aString );
/**
* Returns |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.
*
* It rejects sequences with the following errors:
*
* byte sequences that cannot be decoded into characters according to
* UTF-8's rules (including cases where the input is part of a valid
* UTF-8 sequence but starts or ends mid-character)
* overlong sequences (i.e., cases where a character was encoded
* non-canonically by using more bytes than necessary)
* surrogate codepoints (i.e., the codepoints reserved for
representing astral characters in UTF-16)
* codepoints above the unicode range (i.e., outside the first 17
* planes; higher than U+10FFFF), in accordance with
* http://tools.ietf.org/html/rfc3629
* when aRejectNonChar is true (the default), any codepoint whose low
* 16 bits are 0xFFFE or 0xFFFF
*
* @param aString an 8-bit wide string to scan
* @param aRejectNonChar a boolean to control the rejection of utf-8
* non characters
*/
bool IsUTF8( const nsACString& aString, bool aRejectNonChar = true );
bool ParseString(const nsACString& aAstring, char aDelimiter,
nsTArray<nsCString>& aArray);
/**
* Converts case in place in the argument string.
*/
void ToUpperCase( nsACString& );
void ToLowerCase( nsACString& );
void ToUpperCase( nsCSubstring& );
void ToLowerCase( nsCSubstring& );
/**
* Converts case from string aSource to aDest.
*/
void ToUpperCase( const nsACString& aSource, nsACString& aDest );
void ToLowerCase( const nsACString& aSource, nsACString& aDest );
/**
* Finds the leftmost occurrence of |aPattern|, if any in the range |aSearchStart|..|aSearchEnd|.
*
* Returns |true| if a match was found, and adjusts |aSearchStart| and |aSearchEnd| to
* point to the match. If no match was found, returns |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.
*/
bool FindInReadable( const nsAString& aPattern, nsAString::const_iterator&, nsAString::const_iterator&, const nsStringComparator& = nsDefaultStringComparator() );
bool 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 bool 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 bool 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);
}
bool CaseInsensitiveFindInReadable( const nsACString& aPattern, nsACString::const_iterator&, nsACString::const_iterator& );
/**
* Finds the rightmost occurrence of |aPattern|
* Returns |true| if a match was found, and adjusts |aSearchStart| and |aSearchEnd| to
* point to the match. If no match was found, returns |false| and makes |aSearchStart == aSearchEnd|.
*
*/
bool RFindInReadable( const nsAString& aPattern, nsAString::const_iterator&, nsAString::const_iterator&, const nsStringComparator& = nsDefaultStringComparator() );
bool 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 |true| if a match was found, and adjusts |aSearchStart| to
* point to the match. If no match was found, returns |false| and
* makes |aSearchStart == aSearchEnd|.
*/
bool FindCharInReadable( PRUnichar aChar, nsAString::const_iterator& aSearchStart, const nsAString::const_iterator& aSearchEnd );
bool FindCharInReadable( char aChar, nsACString::const_iterator& aSearchStart, const nsACString::const_iterator& aSearchEnd );
/**
* Finds the number of occurences of |aChar| in the string |aStr|
*/
uint32_t CountCharInReadable( const nsAString& aStr,
PRUnichar aChar );
uint32_t CountCharInReadable( const nsACString& aStr,
char aChar );
bool
StringBeginsWith( const nsAString& aSource, const nsAString& aSubstring,
const nsStringComparator& aComparator =
nsDefaultStringComparator() );
bool
StringBeginsWith( const nsACString& aSource, const nsACString& aSubstring,
const nsCStringComparator& aComparator =
nsDefaultCStringComparator() );
bool
StringEndsWith( const nsAString& aSource, const nsAString& aSubstring,
const nsStringComparator& aComparator =
nsDefaultStringComparator() );
bool
StringEndsWith( const nsACString& aSource, const nsACString& aSubstring,
const nsCStringComparator& aComparator =
nsDefaultCStringComparator() );
const nsAFlatString& EmptyString();
const nsAFlatCString& EmptyCString();
const nsAFlatString& NullString();
const nsAFlatCString& NullCString();
/**
* 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 INT32_MIN.
*/
int32_t
CompareUTF8toUTF16(const nsASingleFragmentCString& aUTF8String,
const nsASingleFragmentString& aUTF16String);
void
AppendUCS4ToUTF16(const uint32_t aSource, nsAString& aDest);
template<class T>
inline bool EnsureStringLength(T& aStr, uint32_t aLen)
{
aStr.SetLength(aLen);
return (aStr.Length() == aLen);
}
#endif // !defined(nsReadableUtils_h___)
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