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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains the declaration of class TextReader.
#ifndef O3D_UTILS_CROSS_TEXT_READER_H_
#define O3D_UTILS_CROSS_TEXT_READER_H_
#include <string>
#include "base/basictypes.h"
namespace o3d {
// TextReader is the abstract base class of classes
// that read a sequence of characters to an underlying
// medium.
class TextReader {
public:
// Construct a new TextReader.
TextReader();
virtual ~TextReader();
// Returns true if at the end of the input.
virtual bool IsAtEnd() const = 0;
// Read ahead up to count characters and return them as a string,
// but don't modify the input's current position. Returns the empty
// string if at the end of the input.
virtual std::string PeekString(std::string::size_type count) const = 0;
// Read a single character.
virtual char ReadChar() = 0;
// Read a number of characters as a string. If the input isn't that
// long, the string may be shorter than the given number of
// characters. Returns an empty string if it is already at the end
// of the input or if there is an error.
virtual std::string ReadString(std::string::size_type count) = 0;
// Read a line of text, terminated by any kind of line terminator
// (LF/CRLF/CR). Returns the empty string if at end of input, or if
// there is an error.
virtual std::string ReadLine() = 0;
// Read the remaining file into a string, linefeeds and all.
// Returns the empty string if already at the end of the file or
// there is an error.
virtual std::string ReadToEnd() = 0;
protected:
// Returns length of EOL marker (one or two characters) if the given
// character string starts with an end of line marker. Returns zero
// if there is no EOL marker at the BEGINNING of the string.
static int TestForEndOfLine(const std::string& eol);
private:
DISALLOW_COPY_AND_ASSIGN(TextReader);
};
} // namespace o3d
#endif // O3D_UTILS_CROSS_TEXT_READER_H_
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