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CharactersReader.hpp
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/*
Copyright (C) 2013 Przemek Mazurkiewicz ([email protected])
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#ifndef XML_CHARACTERS_READER_HPP__f66b9cdaf20734ef11086d0851a9c563
#define XML_CHARACTERS_READER_HPP__f66b9cdaf20734ef11086d0851a9c563
#include <istream>
/**
@file CharactersReader.hpp
*/
namespace Xml
{
/**
@brief Encoding stuff.
*/
namespace Encoding
{
/**
@brief Abstract class for reading characters from XML documents.
*/
class CharactersReader
{
public:
/**
@brief Destructor.
*/
virtual ~CharactersReader();
/**
@brief Checks if character is allowed in XML document.
@param codePoint Unicode character.
@return True if character is allowed in XML document.
@sa http://www.w3.org/TR/2008/REC-xml-20081126/#NT-Char.
*/
static bool IsChar(char32_t codePoint);
/**
@brief Checks if character is a white space.
@param codePoint Unicode character.
@return True if character is either space, carriage return, line feed or tab.
*/
static bool IsWhiteSpace(char32_t codePoint);
/**
@brief Checks if character is allowed to be the first character of the XML name.
@param codePoint Unicode character.
@return True if character is allowed to be the first character of the XML name.
@sa http://www.w3.org/TR/2008/REC-xml-20081126/#NT-NameStartChar.
*/
static bool IsNameStartChar(char32_t codePoint);
/**
@brief Checks if character is allowed to be the one of
the XML name characters except first.
@param codePoint Unicode character.
@return True if character is allowed to be the one of
the XML name characters except first.
@sa http://www.w3.org/TR/2008/REC-xml-20081126/#NT-NameChar.
*/
static bool IsNameChar(char32_t codePoint);
/**
@brief Checks if character is allowed to be the first character of
the XML encoding declaration name.
@param codePoint Unicode character.
@return True if character is allowed to be the first character of
the XML encoding declaration name.
@sa http://www.w3.org/TR/2008/REC-xml-20081126/#NT-EncName.
*/
static bool IsEncNameStartChar(char32_t codePoint);
/**
@brief Checks if character is allowed to be the one of
the XML encoding declaration name characters except first.
@param codePoint Unicode character.
@return True if character is allowed to be the one of
the XML encoding declaration name characters except first.
@sa http://www.w3.org/TR/2008/REC-xml-20081126/#NT-EncName.
*/
static bool IsEncNameChar(char32_t codePoint);
/**
@brief Gets the value represented by hexadecimal character.
@param codePoint Unicode character.
@return Value represented by hexadecimal character,
or -1 if this is not the hexadecimal character.
*/
static int GetHexDigitValue(char32_t codePoint);
/**
@brief Reads one character from the specifically encoded source
and translates it to the Unicode character.
The source could be a stream, buffer or anything
depending on derived class.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result) = 0;
};
/**
@brief Abstract UTF-8 characters reader base class.
*/
class Utf8ReaderBase : public CharactersReader
{
protected:
/**
@brief Gets the bytes count of UTF-8 encoded character.
@param leadingByte First byte of character sequence.
@return Bytes count of UTF-8 encoded character or 0 if
character is invalid.
*/
static unsigned int GetBytesCount(unsigned char leadingByte);
public:
/**
@brief Destructor.
*/
virtual ~Utf8ReaderBase();
};
/**
@brief UTF-8 characters reader from input stream.
*/
class Utf8StreamReader : public Utf8ReaderBase
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
a Unicode characters will be extracted.
*/
Utf8StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~Utf8StreamReader();
/**
@brief Reads one Unicode character.
Depending on the character there could be from 1 to 4
bytes needed to read from the UTF-8 encoded stream.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief UTF-8 characters reader from iterators.
Purpose of this class is an ability to parsing XML documents
from iterators with a fixed encoding (UTF-8) without
checking BOM and character set in XML declaration.
If you are not sure how document is encoded, use Xml::Inspector
constructor or Xml::Inspector::Reset method with specified
iterators instead of this reader.
You can also use the reader object without intermediate
Xml::Inspector class:
@code{.cpp}
#include "CharactersReader.hpp"
#include <iostream>
#include <cstdlib>
#include <string>
int main()
{
// We want to convert UTF-8 string to UTF-32 string.
std::string source =
u8"<root>Greek small letter pi: \U000003C0.</root>";
std::u32string destination;
std::u32string desired =
U"<root>Greek small letter pi: \U000003C0.</root>";
Xml::Encoding::Utf8IteratorsReader<std::string::iterator> reader(
source.begin(), source.end());
char32_t c;
while (reader.ReadCharacter(c) == 1)
destination.push_back(c);
if (destination == desired)
std::cout << "OK!\n";
else
std::cout << "Not OK :(\n";
return EXIT_SUCCESS;
}
@endcode
Result:
@verbatim
OK!
@endverbatim
*/
template <typename TInputIterator>
class Utf8IteratorsReader : public Utf8ReaderBase
{
private:
TInputIterator iterBegin;
TInputIterator iterEnd;
public:
/**
@brief Constructor.
@param first,last Input iterators to the initial
and final positions in a sequence of bytes. The range used
is [first,last), which contains all the bytes
between first and last, including the element pointed
by first but not the element pointed by last.
*/
Utf8IteratorsReader(TInputIterator first, TInputIterator last);
/**
@brief Destructor.
*/
virtual ~Utf8IteratorsReader();
/**
@brief Reads one Unicode character.
Depending on the character there could be from 1 to 4
bytes per one Unicode character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the first iterator.
*/
TInputIterator GetFirstIterator() const;
/**
@brief Gets the last iterator.
*/
TInputIterator GetLastIterator() const;
/**
@brief Replaces the iterators.
@param first,last Input iterators to the initial
and final positions in a sequence of bytes. The range used
is [first,last), which contains all the bytes
between first and last, including the element pointed
by first but not the element pointed by last.
*/
void ResetIterators(TInputIterator first, TInputIterator last);
};
/**
@brief UTF-16 (big endian) characters reader from input stream.
*/
class Utf16BEStreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
a Unicode characters will be extracted.
*/
Utf16BEStreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~Utf16BEStreamReader();
/**
@brief Reads one Unicode character.
Depending on the character there could be a 2 or 4
bytes needed to read from the UTF-16 (big endian) encoded stream.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief UTF-16 (little endian) characters reader from the input stream.
*/
class Utf16LEStreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
a Unicode characters will be extracted.
*/
Utf16LEStreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~Utf16LEStreamReader();
/**
@brief Reads one Unicode character.
Depending on the character there could be a 2 or 4
bytes needed to read from the UTF-16 (little endian) encoded stream.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief UTF-32 (big endian) characters reader from the input stream.
*/
class Utf32BEStreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
a Unicode characters will be extracted.
*/
Utf32BEStreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~Utf32BEStreamReader();
/**
@brief Reads one Unicode character.
There are 4 bytes needed to read per one character
from the UTF-32 (big endian) encoded stream.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief UTF-32 (little endian) characters reader from the input stream.
*/
class Utf32LEStreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
a Unicode characters will be extracted.
*/
Utf32LEStreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~Utf32LEStreamReader();
/**
@brief Reads one Unicode character.
There are 4 bytes needed to read per one character
from the UTF-32 (little endian) encoded stream.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-1 characters reader from the input stream.
*/
class ISO_8859_1_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-1 characters will be extracted.
*/
ISO_8859_1_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_1_StreamReader();
/**
@brief Reads one ISO-8859-1 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-2 characters reader from the input stream.
*/
class ISO_8859_2_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-2 characters will be extracted.
*/
ISO_8859_2_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_2_StreamReader();
/**
@brief Reads one ISO-8859-2 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-3 characters reader from the input stream.
*/
class ISO_8859_3_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-3 characters will be extracted.
*/
ISO_8859_3_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_3_StreamReader();
/**
@brief Reads one ISO-8859-3 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-4 characters reader from the input stream.
*/
class ISO_8859_4_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-4 characters will be extracted.
*/
ISO_8859_4_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_4_StreamReader();
/**
@brief Reads one ISO-8859-4 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-5 characters reader from the input stream.
*/
class ISO_8859_5_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-5 characters will be extracted.
*/
ISO_8859_5_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_5_StreamReader();
/**
@brief Reads one ISO-8859-5 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-6 characters reader from the input stream.
*/
class ISO_8859_6_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-6 characters will be extracted.
*/
ISO_8859_6_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_6_StreamReader();
/**
@brief Reads one ISO-8859-6 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-7 characters reader from the input stream.
*/
class ISO_8859_7_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-7 characters will be extracted.
*/
ISO_8859_7_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_7_StreamReader();
/**
@brief Reads one ISO-8859-7 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-8 characters reader from the input stream.
*/
class ISO_8859_8_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-8 characters will be extracted.
*/
ISO_8859_8_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_8_StreamReader();
/**
@brief Reads one ISO-8859-8 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-9 characters reader from the input stream.
*/
class ISO_8859_9_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-9 characters will be extracted.
*/
ISO_8859_9_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_9_StreamReader();
/**
@brief Reads one ISO-8859-9 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-10 characters reader from the input stream.
*/
class ISO_8859_10_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-10 characters will be extracted.
*/
ISO_8859_10_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_10_StreamReader();
/**
@brief Reads one ISO-8859-10 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-13 characters reader from the input stream.
*/
class ISO_8859_13_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-13 characters will be extracted.
*/
ISO_8859_13_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_13_StreamReader();
/**
@brief Reads one ISO-8859-13 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;
/**
@brief Replaces the pointer to the input stream.
*/
void ResetInputStream(std::istream* inputStream);
};
/**
@brief ISO-8859-14 characters reader from the input stream.
*/
class ISO_8859_14_StreamReader : public CharactersReader
{
private:
std::istream* in;
public:
/**
@brief Constructor.
@param[in,out] inputStream Input stream from which
an ISO-8859-14 characters will be extracted.
*/
ISO_8859_14_StreamReader(std::istream* inputStream);
/**
@brief Destructor.
*/
virtual ~ISO_8859_14_StreamReader();
/**
@brief Reads one ISO-8859-14 character.
@param[out] result Variable that will receive the Unicode character.
@return @b 1 if the character was read successfully.
@b 0 if there are no more characters to read.
@b -1 if character is not allowed in XML document.
@b -2 if there was an error while reading character.
*/
virtual int ReadCharacter(char32_t& result);
/**
@brief Gets the pointer to the input stream.
*/
std::istream* GetInputStream() const;