mirror of
https://github.com/mozilla/gecko-dev.git
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634 lines
24 KiB
C++
634 lines
24 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla.
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*
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* The Initial Developer of the Original Code is IBM Corporation.
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* Portions created by IBM Corporation are Copyright (C) 2003
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* IBM Corporation. All Rights Reserved.
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*
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* Contributor(s):
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* Scott Collins <scc@mozilla.org> (original author)
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* Darin Fisher <darin@meer.net>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef MOZILLA_INTERNAL_API
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#error Cannot use internal string classes without MOZILLA_INTERNAL_API defined. Use the frozen header nsStringAPI.h instead.
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#endif
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/**
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* The base for string comparators
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*/
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class NS_COM nsTStringComparator_CharT
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{
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public:
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typedef CharT char_type;
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nsTStringComparator_CharT() {}
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virtual int operator()( const char_type*, const char_type*, PRUint32 length ) const = 0;
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virtual int operator()( char_type, char_type ) const = 0;
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};
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/**
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* The default string comparator (case-sensitive comparision)
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*/
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class NS_COM nsTDefaultStringComparator_CharT
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: public nsTStringComparator_CharT
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{
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public:
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typedef CharT char_type;
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nsTDefaultStringComparator_CharT() {}
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virtual int operator()( const char_type*, const char_type*, PRUint32 length ) const;
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virtual int operator()( char_type, char_type ) const;
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};
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/**
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* nsTAString is the most abstract class in the string hierarchy.
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*
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* In its original inception, nsTAString was designed to allow the data
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* storage for a string to be separated into multiple fragments. This was
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* intended to enable lazy string flattening or avoid string flattening
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* altogether in some cases. This abstraction, however, meant that every
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* single string operation (including simple operations such as IsEmpty() and
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* BeginReading()) required virtual function calls. A virtual destructor was
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* also required. This not only meant additional overhead for invoking
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* string methods but also added to additional codesize at every callsite (to
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* load the virtual function address).
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*
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* Today nsTAString exists mainly for backwards compatibility of the string
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* API. It is restricted to representing a contiguous array of characters,
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* where the character array is not necessarily null-terminated. Moreover,
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* since nsTAString's virtual function table was frozen for Mozilla 1.0,
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* nsTAString necessarily maintains ABI compatibility with older versions of
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* Gecko. (nsTObsoleteAString provides that frozen ABI. See
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* nsObsoleteAString.h for a description of how we solve the ABI
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* compatibility requirement while eliminating virtual function calls on
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* nsTAString.)
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*
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* XPIDL still generates C++ header files with references to nsTAStrings, so
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* nsTAString will still be heavily used in real code.
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*
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* If the opportunity to break ABI compatibility with Mozilla 1.0 were to
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* ever arise, our first move should be to make nsTAString equate to
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* nsTSubstring. This may in fact be an option today for some Gecko-based
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* products.
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*/
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class nsTAString_CharT
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{
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public:
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typedef CharT char_type;
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typedef nsCharTraits<char_type> char_traits;
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typedef char_traits::incompatible_char_type incompatible_char_type;
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typedef nsTAString_CharT self_type;
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typedef nsTAString_CharT abstract_string_type;
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typedef nsTObsoleteAString_CharT obsolete_string_type;
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typedef nsTSubstring_CharT substring_type;
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typedef nsTSubstringTuple_CharT substring_tuple_type;
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typedef nsReadingIterator<char_type> const_iterator;
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typedef nsWritingIterator<char_type> iterator;
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typedef nsTStringComparator_CharT comparator_type;
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typedef PRUint32 size_type;
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typedef PRUint32 index_type;
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#ifdef MOZ_V1_STRING_ABI
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public:
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// this acts like a virtual destructor
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NS_COM NS_CONSTRUCTOR_FASTCALL ~nsTAString_CharT();
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/**
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* BeginReading/EndReading can be used to get immutable access to the
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* string's underlying buffer. EndReading returns a pointer to the
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* end of the string's buffer. nsReadableUtils.h provides a collection
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* of utility functions that work with these iterators.
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*/
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inline const_iterator& BeginReading( const_iterator& iter ) const
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{
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size_type len = GetReadableBuffer(&iter.mStart);
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iter.mEnd = iter.mStart + len;
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iter.mPosition = iter.mStart;
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return iter;
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}
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inline const_iterator& EndReading( const_iterator& iter ) const
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{
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size_type len = GetReadableBuffer(&iter.mStart);
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iter.mEnd = iter.mStart + len;
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iter.mPosition = iter.mEnd;
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return iter;
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}
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inline const char_type* BeginReading() const
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{
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const char_type *b;
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GetReadableBuffer(&b);
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return b;
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}
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inline const char_type* EndReading() const
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{
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const char_type *b;
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size_type len = GetReadableBuffer(&b);
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return b + len;
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}
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/**
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* BeginWriting/EndWriting can be used to get mutable access to the
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* string's underlying buffer. EndWriting returns a pointer to the
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* end of the string's buffer.
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*
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* If these methods are unable to return a mutable buffer, then they
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* will return a null iterator.
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*/
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inline iterator& BeginWriting( iterator& iter )
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{
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size_type len = GetWritableBuffer(&iter.mStart);
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iter.mEnd = iter.mStart + len;
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iter.mPosition = iter.mStart;
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return iter;
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}
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inline iterator& EndWriting( iterator& iter )
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{
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size_type len = GetWritableBuffer(&iter.mStart);
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iter.mEnd = iter.mStart + len;
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iter.mPosition = iter.mEnd;
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return iter;
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}
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inline char_type* BeginWriting()
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{
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char_type *b;
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GetWritableBuffer(&b);
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return b;
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}
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inline char_type* EndWriting()
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{
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char_type *b;
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size_type len = GetWritableBuffer(&b);
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return b ? b + len : nsnull;
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}
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/**
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* Get a const pointer to the string's internal buffer. The caller
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* MUST NOT modify the characters at the returned address.
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*
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* @returns The length of the buffer in characters.
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*/
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inline size_type GetData( const char_type** data ) const
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{
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return GetReadableBuffer(data);
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}
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/**
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* Get a pointer to the string's internal buffer, optionally resizing
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* the buffer first. If size_type(-1) is passed for newLen, then the
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* current length of the string is used. The caller MAY modify the
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* characters at the returned address (up to but not exceeding the
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* length of the string).
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*
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* @returns The length of the buffer in characters or 0 if unable to
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* satisfy the request due to low-memory conditions.
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*/
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inline size_type GetMutableData( char_type** data, size_type newLen = size_type(-1) )
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{
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return GetWritableBuffer(data, newLen);
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}
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/**
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* Length checking functions. IsEmpty is a helper function to avoid
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* writing code like: |if (str.Length() == 0)|
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*/
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NS_COM size_type NS_FASTCALL Length() const;
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PRBool IsEmpty() const { return Length() == 0; }
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/**
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* String equality tests. Pass a string comparator if you want to
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* control how the strings are compared. By default, a binary
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* "case-sensitive" comparision is performed.
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*/
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NS_COM PRBool NS_FASTCALL Equals( const self_type& ) const;
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NS_COM PRBool NS_FASTCALL Equals( const self_type&, const comparator_type& ) const;
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NS_COM PRBool NS_FASTCALL Equals( const char_type* ) const;
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NS_COM PRBool NS_FASTCALL Equals( const char_type*, const comparator_type& ) const;
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/**
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* An efficient comparison with ASCII that can be used even
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* for wide strings. Call this version when you know the
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* length of 'data'.
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*/
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NS_COM PRBool NS_FASTCALL EqualsASCII( const char* data, size_type len ) const;
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/**
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* An efficient comparison with ASCII that can be used even
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* for wide strings. Call this version when 'data' is
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* null-terminated.
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*/
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NS_COM PRBool NS_FASTCALL EqualsASCII( const char* data ) const;
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// EqualsLiteral must ONLY be applied to an actual literal string.
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// Do not attempt to use it with a regular char* pointer, or with a char
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// array variable.
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// The template trick to acquire the array length at compile time without
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// using a macro is due to Corey Kosak, with much thanks.
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#ifdef NS_DISABLE_LITERAL_TEMPLATE
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inline PRBool EqualsLiteral( const char* str ) const
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{
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return EqualsASCII(str);
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}
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#else
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template<int N>
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inline PRBool EqualsLiteral( const char (&str)[N] ) const
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{
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return EqualsASCII(str, N-1);
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}
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template<int N>
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inline PRBool EqualsLiteral( char (&str)[N] ) const
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{
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const char* s = str;
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return EqualsASCII(s, N-1);
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}
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#endif
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// The LowerCaseEquals methods compare the lower case version of
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// this string to some ASCII/Literal string. The ASCII string is
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// *not* lowercased for you. If you compare to an ASCII or literal
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// string that contains an uppercase character, it is guaranteed to
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// return false. We will throw assertions too.
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NS_COM PRBool NS_FASTCALL LowerCaseEqualsASCII( const char* data, size_type len ) const;
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NS_COM PRBool NS_FASTCALL LowerCaseEqualsASCII( const char* data ) const;
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// LowerCaseEqualsLiteral must ONLY be applied to an actual
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// literal string. Do not attempt to use it with a regular char*
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// pointer, or with a char array variable. Use
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// LowerCaseEqualsASCII for them.
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#ifdef NS_DISABLE_LITERAL_TEMPLATE
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inline PRBool LowerCaseEqualsLiteral( const char* str ) const
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{
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return LowerCaseEqualsASCII(str);
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}
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#else
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template<int N>
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inline PRBool LowerCaseEqualsLiteral( const char (&str)[N] ) const
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{
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return LowerCaseEqualsASCII(str, N-1);
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}
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template<int N>
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inline PRBool LowerCaseEqualsLiteral( char (&str)[N] ) const
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{
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const char* s = str;
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return LowerCaseEqualsASCII(s, N-1);
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}
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#endif
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/**
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* A string always references a non-null data pointer. In some
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* applications (e.g., the DOM) it is necessary for a string class
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* to have some way to distinguish an empty string from a null (or
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* void) string. These methods enable support for the concept of
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* a void string.
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*/
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NS_COM PRBool NS_FASTCALL IsVoid() const;
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NS_COM void NS_FASTCALL SetIsVoid( PRBool );
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/**
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* This method returns true if the string's underlying buffer is
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* null-terminated. This should rarely be needed by applications.
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* The PromiseFlatTString method should be used to ensure that a
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* string's underlying buffer is null-terminated.
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*/
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NS_COM PRBool NS_FASTCALL IsTerminated() const;
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/**
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* These are contant time since nsTAString uses flat storage
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*/
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NS_COM char_type NS_FASTCALL First() const;
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NS_COM char_type NS_FASTCALL Last() const;
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/**
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* Returns the number of occurrences of the given character.
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*/
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NS_COM size_type NS_FASTCALL CountChar( char_type ) const;
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/**
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* Locates the offset of the first occurrence of the character. Pass a
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* non-zero offset to control where the search begins.
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*/
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NS_COM PRInt32 NS_FASTCALL FindChar( char_type, index_type offset = 0 ) const;
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/**
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* SetCapacity is not required to do anything; however, it can be used
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* as a hint to the implementation to reduce allocations.
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*
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* SetCapacity(0) is a suggestion to discard all associated storage.
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*
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* The |newCapacity| value does not include room for the null
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* terminator. The actual allocation size will be one unit larger
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* than the given value to make room for a null terminator.
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*/
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NS_COM void NS_FASTCALL SetCapacity( size_type newCapacity );
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/**
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* SetLength is used to resize the string's internal buffer. It has
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* the effect of moving the string's null-terminator to the offset
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* specified by |newLen|, and if the string's internal buffer was
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* previously readonly or dependent on some other string, then it will
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* be copied. If there is insufficient memory to perform the resize,
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* then the string will not be modified. If the length of the string
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* is reduced sufficiently, then the string's internal buffer may be
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* resized to something smaller.
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*/
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NS_COM void NS_FASTCALL SetLength( size_type newLen );
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/**
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* Can't use |Truncate| to make a string longer!
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*/
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void Truncate( size_type newLen = 0 )
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{
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NS_ASSERTION(newLen <= Length(), "Truncate cannot make string longer");
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SetLength(newLen);
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}
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/**
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* |Assign| and |operator=| make |this| equivalent to the string or
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* buffer given as an argument. If possible, they do this by sharing
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* a reference counted buffer (see |nsTSubstring|). If not, they copy
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* the buffer into their own buffer.
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*/
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NS_COM void NS_FASTCALL Assign( const self_type& readable );
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NS_COM void NS_FASTCALL Assign( const substring_tuple_type& tuple );
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NS_COM void NS_FASTCALL Assign( const char_type* data );
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NS_COM void NS_FASTCALL Assign( const char_type* data, size_type length );
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NS_COM void NS_FASTCALL Assign( char_type c );
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NS_COM void NS_FASTCALL AssignASCII( const char* data, size_type length );
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NS_COM void NS_FASTCALL AssignASCII( const char* data );
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// AssignLiteral must ONLY be applied to an actual literal string.
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// Do not attempt to use it with a regular char* pointer, or with a char
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// array variable. Use AssignASCII for those.
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#ifdef NS_DISABLE_LITERAL_TEMPLATE
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void AssignLiteral( const char* str )
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{ AssignASCII(str); }
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#else
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template<int N>
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void AssignLiteral( const char (&str)[N] )
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{ AssignASCII(str, N-1); }
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template<int N>
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void AssignLiteral( char (&str)[N] )
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{ AssignASCII(str, N-1); }
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#endif
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// copy-assignment operator. I must define my own if I don't want the compiler to make me one
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self_type& operator=( const self_type& readable ) { Assign(readable); return *this; }
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self_type& operator=( const substring_tuple_type& tuple ) { Assign(tuple); return *this; }
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self_type& operator=( const char_type* data ) { Assign(data); return *this; }
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self_type& operator=( char_type c ) { Assign(c); return *this; }
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/**
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* |Append|, |operator+=| are used to add characters to the end of this string.
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*/
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NS_COM void NS_FASTCALL Append( const self_type& readable );
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NS_COM void NS_FASTCALL Append( const substring_tuple_type& tuple );
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NS_COM void NS_FASTCALL Append( const char_type* data );
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NS_COM void NS_FASTCALL Append( const char_type* data, size_type length );
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NS_COM void NS_FASTCALL Append( char_type c );
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NS_COM void NS_FASTCALL AppendASCII( const char* data, size_type length );
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NS_COM void NS_FASTCALL AppendASCII( const char* data );
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// AppendLiteral must ONLY be applied to an actual literal string.
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// Do not attempt to use it with a regular char* pointer, or with a char
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// array variable. Use AppendASCII for those.
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#ifdef NS_DISABLE_LITERAL_TEMPLATE
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void AppendLiteral( const char* str )
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{ AppendASCII(str); }
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#else
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template<int N>
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void AppendLiteral( const char (&str)[N] )
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{ AppendASCII(str, N-1); }
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template<int N>
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void AppendLiteral( char (&str)[N] )
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{ AppendASCII(str, N-1); }
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#endif
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self_type& operator+=( const self_type& readable ) { Append(readable); return *this; }
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self_type& operator+=( const substring_tuple_type& tuple ) { Append(tuple); return *this; }
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self_type& operator+=( const char_type* data ) { Append(data); return *this; }
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self_type& operator+=( char_type c ) { Append(c); return *this; }
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/**
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* |Insert| is used to add characters into this string at a given position.
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* NOTE: It's a shame the |pos| parameter isn't at the front of the arg list.
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*/
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NS_COM void NS_FASTCALL Insert( const self_type& readable, index_type pos );
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NS_COM void NS_FASTCALL Insert( const substring_tuple_type& tuple, index_type pos );
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NS_COM void NS_FASTCALL Insert( const char_type* data, index_type pos );
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NS_COM void NS_FASTCALL Insert( const char_type* data, index_type pos, size_type length );
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NS_COM void NS_FASTCALL Insert( char_type c, index_type pos );
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/**
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* |Cut| is used to remove a range of characters from this string.
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|
*/
|
|
|
|
NS_COM void NS_FASTCALL Cut( index_type cutStart, size_type cutLength );
|
|
|
|
|
|
/**
|
|
* |Replace| is used overwrite a range of characters from this string.
|
|
*/
|
|
|
|
NS_COM void NS_FASTCALL Replace( index_type cutStart, size_type cutLength, const self_type& readable );
|
|
NS_COM void NS_FASTCALL Replace( index_type cutStart, size_type cutLength, const substring_tuple_type& readable );
|
|
|
|
|
|
/**
|
|
* this is public to support automatic conversion of tuple to abstract
|
|
* string, which is necessary to support our API.
|
|
*/
|
|
nsTAString_CharT(const substring_tuple_type& tuple)
|
|
: mVTable(obsolete_string_type::sCanonicalVTable)
|
|
, mData(nsnull)
|
|
, mLength(0)
|
|
, mFlags(0)
|
|
{
|
|
Assign(tuple);
|
|
}
|
|
|
|
protected:
|
|
|
|
friend class nsTSubstringTuple_CharT;
|
|
|
|
// GCC 3.2 erroneously needs these (even though they are subclasses!)
|
|
friend class nsTSubstring_CharT;
|
|
friend class nsTDependentSubstring_CharT;
|
|
friend class nsTPromiseFlatString_CharT;
|
|
|
|
/**
|
|
* the address of our virtual function table. required for backwards
|
|
* compatibility with Mozilla 1.0 frozen nsAC?String interface.
|
|
*/
|
|
const void* mVTable;
|
|
|
|
/**
|
|
* these fields are "here" only when mVTable == sCanonicalVTable.
|
|
*
|
|
* they exist to support automatic construction of a nsTAString
|
|
* from a nsTSubstringTuple.
|
|
*/
|
|
char_type* mData;
|
|
size_type mLength;
|
|
PRUint32 mFlags;
|
|
|
|
/**
|
|
* nsTAString must be subclassed before it can be instantiated.
|
|
*/
|
|
nsTAString_CharT(char_type* data, size_type length, PRUint32 flags)
|
|
: mVTable(obsolete_string_type::sCanonicalVTable)
|
|
, mData(data)
|
|
, mLength(length)
|
|
, mFlags(flags)
|
|
{}
|
|
|
|
/**
|
|
* optional ctor for use by subclasses.
|
|
*
|
|
* NOTE: mData and mLength are intentionally left uninitialized.
|
|
*/
|
|
explicit
|
|
nsTAString_CharT(PRUint32 flags)
|
|
: mVTable(obsolete_string_type::sCanonicalVTable)
|
|
, mFlags(flags)
|
|
{}
|
|
|
|
/**
|
|
* get pointer to internal string buffer (may not be null terminated).
|
|
* return length of buffer.
|
|
*/
|
|
NS_COM size_type NS_FASTCALL GetReadableBuffer( const char_type **data ) const;
|
|
NS_COM size_type NS_FASTCALL GetWritableBuffer( char_type **data, size_type newLen = size_type(-1) );
|
|
|
|
/**
|
|
* returns true if this tuple is dependent on (i.e., overlapping with)
|
|
* the given char sequence.
|
|
*/
|
|
PRBool NS_FASTCALL IsDependentOn(const char_type *start, const char_type *end) const;
|
|
|
|
/**
|
|
* we can be converted to a const nsTSubstring (dependent on this)
|
|
*/
|
|
const substring_type NS_FASTCALL ToSubstring() const;
|
|
|
|
/**
|
|
* type cast helpers
|
|
*/
|
|
|
|
const obsolete_string_type* AsObsoleteString() const
|
|
{
|
|
return NS_REINTERPRET_CAST(const obsolete_string_type*, this);
|
|
}
|
|
|
|
obsolete_string_type* AsObsoleteString()
|
|
{
|
|
return NS_REINTERPRET_CAST(obsolete_string_type*, this);
|
|
}
|
|
|
|
const substring_type* AsSubstring() const
|
|
{
|
|
return NS_REINTERPRET_CAST(const substring_type*, this);
|
|
}
|
|
|
|
substring_type* AsSubstring()
|
|
{
|
|
return NS_REINTERPRET_CAST(substring_type*, this);
|
|
}
|
|
|
|
private:
|
|
|
|
// GCC 2.95.3, EGCS-2.91.66, Sun Workshop/Forte, and IBM VisualAge C++
|
|
// require a public copy-constructor in order to support automatic
|
|
// construction of a nsTAString from a nsTSubstringTuple. I believe
|
|
// enabling the default copy-constructor is harmless, but I do not want
|
|
// it to be enabled by default because that might tempt people into
|
|
// using it (where it would be invalid).
|
|
#if !defined(__SUNPRO_CC) && \
|
|
!(defined(_AIX) && defined(__IBMCPP__)) && \
|
|
(!defined(__GNUC__) || __GNUC__ > 2 || __GNUC_MINOR__ > 95)
|
|
|
|
// NOT TO BE IMPLEMENTED
|
|
nsTAString_CharT( const self_type& );
|
|
|
|
#endif
|
|
|
|
// NOT TO BE IMPLEMENTED
|
|
void operator= ( incompatible_char_type );
|
|
void Assign ( incompatible_char_type );
|
|
void operator+= ( incompatible_char_type );
|
|
void Append ( incompatible_char_type );
|
|
void Insert ( incompatible_char_type, index_type );
|
|
#endif
|
|
};
|