428 lines
16 KiB
C++
428 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// IWYU pragma: private, include "nsString.h"
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#ifndef nsReadableUtils_h___
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#define nsReadableUtils_h___
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/**
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* I guess all the routines in this file are all mis-named.
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* According to our conventions, they should be |NS_xxx|.
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*/
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#include "mozilla/Assertions.h"
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#include "nsAString.h"
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#include "nsTArrayForwardDeclare.h"
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inline size_t
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Distance(const nsReadingIterator<char16_t>& aStart,
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const nsReadingIterator<char16_t>& aEnd)
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{
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MOZ_ASSERT(aStart.get() <= aEnd.get());
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return static_cast<size_t>(aEnd.get() - aStart.get());
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}
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inline size_t
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Distance(const nsReadingIterator<char>& aStart,
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const nsReadingIterator<char>& aEnd)
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{
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MOZ_ASSERT(aStart.get() <= aEnd.get());
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return static_cast<size_t>(aEnd.get() - aStart.get());
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}
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void LossyCopyUTF16toASCII(const nsAString& aSource, nsACString& aDest);
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void CopyASCIItoUTF16(const nsACString& aSource, nsAString& aDest);
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void LossyCopyUTF16toASCII(const char16ptr_t aSource, nsACString& aDest);
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void CopyASCIItoUTF16(const char* aSource, nsAString& aDest);
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void CopyUTF16toUTF8(const nsAString& aSource, nsACString& aDest);
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MOZ_MUST_USE bool CopyUTF16toUTF8(const nsAString& aSource, nsACString& aDest,
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const mozilla::fallible_t&);
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void CopyUTF8toUTF16(const nsACString& aSource, nsAString& aDest);
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void CopyUTF16toUTF8(const char16ptr_t aSource, nsACString& aDest);
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void CopyUTF8toUTF16(const char* aSource, nsAString& aDest);
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void LossyAppendUTF16toASCII(const nsAString& aSource, nsACString& aDest);
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void AppendASCIItoUTF16(const nsACString& aSource, nsAString& aDest);
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MOZ_MUST_USE bool AppendASCIItoUTF16(const nsACString& aSource,
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nsAString& aDest,
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const mozilla::fallible_t&);
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void LossyAppendUTF16toASCII(const char16ptr_t aSource, nsACString& aDest);
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MOZ_MUST_USE bool AppendASCIItoUTF16(const char* aSource,
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nsAString& aDest,
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const mozilla::fallible_t&);
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void AppendASCIItoUTF16(const char* aSource, nsAString& aDest);
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void AppendUTF16toUTF8(const nsAString& aSource, nsACString& aDest);
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MOZ_MUST_USE bool AppendUTF16toUTF8(const nsAString& aSource,
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nsACString& aDest,
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const mozilla::fallible_t&);
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void AppendUTF8toUTF16(const nsACString& aSource, nsAString& aDest);
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MOZ_MUST_USE bool AppendUTF8toUTF16(const nsACString& aSource,
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nsAString& aDest,
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const mozilla::fallible_t&);
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void AppendUTF16toUTF8(const char16ptr_t aSource, nsACString& aDest);
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void AppendUTF8toUTF16(const char* aSource, nsAString& aDest);
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/**
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* Returns a new |char| buffer containing a zero-terminated copy of |aSource|.
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*
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* Allocates and returns a new |char| buffer which you must free with |free|.
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* Performs a lossy encoding conversion by chopping 16-bit wide characters down to 8-bits wide while copying |aSource| to your new buffer.
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* This conversion is not well defined; but it reproduces legacy string behavior.
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* The new buffer is zero-terminated, but that may not help you if |aSource| contains embedded nulls.
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*
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* @param aSource a 16-bit wide string
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* @return a new |char| buffer you must free with |free|.
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*/
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char* ToNewCString(const nsAString& aSource);
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/**
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* Returns a new |char| buffer containing a zero-terminated copy of |aSource|.
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*
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* Allocates and returns a new |char| buffer which you must free with |free|.
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* The new buffer is zero-terminated, but that may not help you if |aSource| contains embedded nulls.
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*
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* @param aSource an 8-bit wide string
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* @return a new |char| buffer you must free with |free|.
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*/
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char* ToNewCString(const nsACString& aSource);
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/**
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* Returns a new |char| buffer containing a zero-terminated copy of |aSource|.
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*
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* Allocates and returns a new |char| buffer which you must free with
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* |free|.
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* Performs an encoding conversion from a UTF-16 string to a UTF-8 string
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* copying |aSource| to your new buffer.
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* The new buffer is zero-terminated, but that may not help you if |aSource|
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* contains embedded nulls.
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*
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* @param aSource a UTF-16 string (made of char16_t's)
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* @param aUTF8Count the number of 8-bit units that was returned
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* @return a new |char| buffer you must free with |free|.
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*/
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char* ToNewUTF8String(const nsAString& aSource, uint32_t* aUTF8Count = nullptr);
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/**
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* Returns a new |char16_t| buffer containing a zero-terminated copy of
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* |aSource|.
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*
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* Allocates and returns a new |char16_t| buffer which you must free with
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* |free|.
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* The new buffer is zero-terminated, but that may not help you if |aSource|
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* contains embedded nulls.
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*
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* @param aSource a UTF-16 string
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* @return a new |char16_t| buffer you must free with |free|.
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*/
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char16_t* ToNewUnicode(const nsAString& aSource);
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/**
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* Returns a new |char16_t| buffer containing a zero-terminated copy of |aSource|.
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*
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* Allocates and returns a new |char16_t| buffer which you must free with |free|.
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* Performs an encoding conversion by 0-padding 8-bit wide characters up to 16-bits wide while copying |aSource| to your new buffer.
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* This conversion is not well defined; but it reproduces legacy string behavior.
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* The new buffer is zero-terminated, but that may not help you if |aSource| contains embedded nulls.
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*
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* @param aSource an 8-bit wide string (a C-string, NOT UTF-8)
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* @return a new |char16_t| buffer you must free with |free|.
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*/
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char16_t* ToNewUnicode(const nsACString& aSource);
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/**
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* Returns the required length for a char16_t buffer holding
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* a copy of aSource, using UTF-8 to UTF-16 conversion.
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* The length does NOT include any space for zero-termination.
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*
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* @param aSource an 8-bit wide string, UTF-8 encoded
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* @return length of UTF-16 encoded string copy, not zero-terminated
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*/
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uint32_t CalcUTF8ToUnicodeLength(const nsACString& aSource);
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/**
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* Copies the source string into the specified buffer, converting UTF-8 to
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* UTF-16 in the process. The conversion is well defined for valid UTF-8
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* strings.
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* The copied string will be zero-terminated! Any embedded nulls will be
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* copied nonetheless. It is the caller's responsiblity to ensure the buffer
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* is large enough to hold the string copy plus one char16_t for
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* zero-termination!
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*
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* @see CalcUTF8ToUnicodeLength( const nsACString& )
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* @see UTF8ToNewUnicode( const nsACString&, uint32_t* )
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*
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* @param aSource an 8-bit wide string, UTF-8 encoded
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* @param aBuffer the buffer holding the converted string copy
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* @param aUTF16Count receiving optionally the number of 16-bit units that
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* were copied
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* @return aBuffer pointer, for convenience
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*/
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char16_t* UTF8ToUnicodeBuffer(const nsACString& aSource,
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char16_t* aBuffer,
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uint32_t* aUTF16Count = nullptr);
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/**
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* Returns a new |char16_t| buffer containing a zero-terminated copy
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* of |aSource|.
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*
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* Allocates and returns a new |char| buffer which you must free with
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* |free|. Performs an encoding conversion from UTF-8 to UTF-16
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* while copying |aSource| to your new buffer. This conversion is well defined
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* for a valid UTF-8 string. The new buffer is zero-terminated, but that
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* may not help you if |aSource| contains embedded nulls.
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*
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* @param aSource an 8-bit wide string, UTF-8 encoded
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* @param aUTF16Count the number of 16-bit units that was returned
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* @return a new |char16_t| buffer you must free with |free|.
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* (UTF-16 encoded)
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*/
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char16_t* UTF8ToNewUnicode(const nsACString& aSource,
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uint32_t* aUTF16Count = nullptr);
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/**
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* Copies |aLength| 16-bit code units from the start of |aSource| to the
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* |char16_t| buffer |aDest|.
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*
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* After this operation |aDest| is not null terminated.
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*
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* @param aSource a UTF-16 string
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* @param aSrcOffset start offset in the source string
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* @param aDest a |char16_t| buffer
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* @param aLength the number of 16-bit code units to copy
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* @return pointer to destination buffer - identical to |aDest|
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*/
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char16_t* CopyUnicodeTo(const nsAString& aSource,
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uint32_t aSrcOffset,
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char16_t* aDest,
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uint32_t aLength);
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/**
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* Copies 16-bit characters between iterators |aSrcStart| and
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* |aSrcEnd| to the writable string |aDest|. Similar to the
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* |nsString::Mid| method.
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*
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* After this operation |aDest| is not null terminated.
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*
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* @param aSrcStart start source iterator
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* @param aSrcEnd end source iterator
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* @param aDest destination for the copy
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*/
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void CopyUnicodeTo(const nsAString::const_iterator& aSrcStart,
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const nsAString::const_iterator& aSrcEnd,
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nsAString& aDest);
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/**
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* Appends 16-bit characters between iterators |aSrcStart| and
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* |aSrcEnd| to the writable string |aDest|.
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*
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* After this operation |aDest| is not null terminated.
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*
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* @param aSrcStart start source iterator
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* @param aSrcEnd end source iterator
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* @param aDest destination for the copy
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*/
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void AppendUnicodeTo(const nsAString::const_iterator& aSrcStart,
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const nsAString::const_iterator& aSrcEnd,
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nsAString& aDest);
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/**
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* Returns |true| if |aString| contains only ASCII characters, that is, characters in the range (0x00, 0x7F).
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*
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* @param aString a 16-bit wide string to scan
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*/
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bool IsASCII(const nsAString& aString);
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/**
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* Returns |true| if |aString| contains only ASCII characters, that is, characters in the range (0x00, 0x7F).
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*
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* @param aString a 8-bit wide string to scan
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*/
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bool IsASCII(const nsACString& aString);
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/**
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* Returns |true| if |aString| is a valid UTF-8 string.
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* XXX This is not bullet-proof and nor an all-purpose UTF-8 validator.
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* It is mainly written to replace and roughly equivalent to
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*
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* str.Equals(NS_ConvertUTF16toUTF8(NS_ConvertUTF8toUTF16(str)))
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*
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* (see bug 191541)
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* As such, it does not check for non-UTF-8 7bit encodings such as
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* ISO-2022-JP and HZ.
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*
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* It rejects sequences with the following errors:
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*
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* byte sequences that cannot be decoded into characters according to
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* UTF-8's rules (including cases where the input is part of a valid
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* UTF-8 sequence but starts or ends mid-character)
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* overlong sequences (i.e., cases where a character was encoded
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* non-canonically by using more bytes than necessary)
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* surrogate codepoints (i.e., the codepoints reserved for
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representing astral characters in UTF-16)
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* codepoints above the unicode range (i.e., outside the first 17
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* planes; higher than U+10FFFF), in accordance with
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* http://tools.ietf.org/html/rfc3629
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* when aRejectNonChar is true (the default), any codepoint whose low
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* 16 bits are 0xFFFE or 0xFFFF
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*
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* @param aString an 8-bit wide string to scan
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* @param aRejectNonChar a boolean to control the rejection of utf-8
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* non characters
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*/
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bool IsUTF8(const nsACString& aString, bool aRejectNonChar = true);
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bool ParseString(const nsACString& aAstring, char aDelimiter,
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nsTArray<nsCString>& aArray);
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/**
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* Converts case in place in the argument string.
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*/
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void ToUpperCase(nsACString&);
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void ToLowerCase(nsACString&);
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void ToUpperCase(nsCSubstring&);
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void ToLowerCase(nsCSubstring&);
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/**
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* Converts case from string aSource to aDest.
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*/
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void ToUpperCase(const nsACString& aSource, nsACString& aDest);
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void ToLowerCase(const nsACString& aSource, nsACString& aDest);
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/**
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* Finds the leftmost occurrence of |aPattern|, if any in the range |aSearchStart|..|aSearchEnd|.
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*
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* Returns |true| if a match was found, and adjusts |aSearchStart| and |aSearchEnd| to
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* point to the match. If no match was found, returns |false| and makes |aSearchStart == aSearchEnd|.
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*
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* Currently, this is equivalent to the O(m*n) implementation previously on |ns[C]String|.
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* If we need something faster, then we can implement that later.
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*/
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bool FindInReadable(const nsAString& aPattern, nsAString::const_iterator&,
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nsAString::const_iterator&,
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const nsStringComparator& = nsDefaultStringComparator());
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bool FindInReadable(const nsACString& aPattern, nsACString::const_iterator&,
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nsACString::const_iterator&,
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const nsCStringComparator& = nsDefaultCStringComparator());
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/* sometimes we don't care about where the string was, just that we
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* found it or not */
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inline bool
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FindInReadable(const nsAString& aPattern, const nsAString& aSource,
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const nsStringComparator& aCompare = nsDefaultStringComparator())
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{
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nsAString::const_iterator start, end;
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aSource.BeginReading(start);
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aSource.EndReading(end);
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return FindInReadable(aPattern, start, end, aCompare);
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}
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inline bool
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FindInReadable(const nsACString& aPattern, const nsACString& aSource,
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const nsCStringComparator& aCompare = nsDefaultCStringComparator())
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{
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nsACString::const_iterator start, end;
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aSource.BeginReading(start);
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aSource.EndReading(end);
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return FindInReadable(aPattern, start, end, aCompare);
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}
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bool CaseInsensitiveFindInReadable(const nsACString& aPattern,
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nsACString::const_iterator&,
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nsACString::const_iterator&);
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/**
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* Finds the rightmost occurrence of |aPattern|
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* Returns |true| if a match was found, and adjusts |aSearchStart| and |aSearchEnd| to
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* point to the match. If no match was found, returns |false| and makes |aSearchStart == aSearchEnd|.
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*
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*/
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bool RFindInReadable(const nsAString& aPattern, nsAString::const_iterator&,
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nsAString::const_iterator&,
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const nsStringComparator& = nsDefaultStringComparator());
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bool RFindInReadable(const nsACString& aPattern, nsACString::const_iterator&,
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nsACString::const_iterator&,
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const nsCStringComparator& = nsDefaultCStringComparator());
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/**
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* Finds the leftmost occurrence of |aChar|, if any in the range
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* |aSearchStart|..|aSearchEnd|.
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*
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* Returns |true| if a match was found, and adjusts |aSearchStart| to
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* point to the match. If no match was found, returns |false| and
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* makes |aSearchStart == aSearchEnd|.
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*/
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bool FindCharInReadable(char16_t aChar, nsAString::const_iterator& aSearchStart,
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const nsAString::const_iterator& aSearchEnd);
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bool FindCharInReadable(char aChar, nsACString::const_iterator& aSearchStart,
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const nsACString::const_iterator& aSearchEnd);
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/**
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* Finds the number of occurences of |aChar| in the string |aStr|
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*/
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uint32_t CountCharInReadable(const nsAString& aStr,
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char16_t aChar);
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uint32_t CountCharInReadable(const nsACString& aStr,
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char aChar);
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bool StringBeginsWith(const nsAString& aSource, const nsAString& aSubstring);
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bool StringBeginsWith(const nsAString& aSource, const nsAString& aSubstring,
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const nsStringComparator& aComparator);
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bool StringBeginsWith(const nsACString& aSource, const nsACString& aSubstring);
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bool StringBeginsWith(const nsACString& aSource, const nsACString& aSubstring,
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const nsCStringComparator& aComparator);
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bool StringEndsWith(const nsAString& aSource, const nsAString& aSubstring);
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bool StringEndsWith(const nsAString& aSource, const nsAString& aSubstring,
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const nsStringComparator& aComparator);
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bool StringEndsWith(const nsACString& aSource, const nsACString& aSubstring);
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bool StringEndsWith(const nsACString& aSource, const nsACString& aSubstring,
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const nsCStringComparator& aComparator);
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const nsAFlatString& EmptyString();
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const nsAFlatCString& EmptyCString();
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const nsAFlatString& NullString();
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const nsAFlatCString& NullCString();
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/**
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* Compare a UTF-8 string to an UTF-16 string.
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*
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* Returns 0 if the strings are equal, -1 if aUTF8String is less
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* than aUTF16Count, and 1 in the reverse case. In case of fatal
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* error (eg the strings are not valid UTF8 and UTF16 respectively),
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* this method will return INT32_MIN.
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*/
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int32_t CompareUTF8toUTF16(const nsASingleFragmentCString& aUTF8String,
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const nsASingleFragmentString& aUTF16String);
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void AppendUCS4ToUTF16(const uint32_t aSource, nsAString& aDest);
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template<class T>
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inline bool
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EnsureStringLength(T& aStr, uint32_t aLen)
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{
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aStr.SetLength(aLen);
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return (aStr.Length() == aLen);
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}
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#endif // !defined(nsReadableUtils_h___)
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