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78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
/*
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** Copyright (c) 1997-2015 Mark Page
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any damages
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** arising from the use of this software.
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**
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** Permission is granted to anyone to use this software for any purpose,
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** including commercial applications, and to alter it and redistribute it
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** freely, subject to the following restrictions:
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**
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** 1. The origin of this software must not be misrepresented; you must not
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** claim that you wrote the original software. If you use this software
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** in a product, an acknowledgment in the product documentation would be
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** appreciated but is not required.
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** 2. Altered source versions must be plainly marked as such, and must not be
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** misrepresented as being the original software.
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** 3. This notice may not be removed or altered from any source distribution.
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**
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*/
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#pragma once
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#include <string>
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/// \brief UTF8 reader helper functions.
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class UTF8Reader
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{
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public:
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/// Important: text is not copied by this class and must remain valid during its usage.
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UTF8Reader(const std::string::value_type *text, std::string::size_type length);
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/// \brief Returns true if the current position is at the end of the string
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bool is_end();
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/// \brief Get the character at the current position
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unsigned int character();
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/// \brief Returns the length of the current character
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std::string::size_type char_length();
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/// \brief Moves position to the previous character
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void prev();
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/// \brief Moves position to the next character
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void next();
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/// \brief Moves position to the lead byte of the character
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void move_to_leadbyte();
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/// \brief Get the current position of the reader
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std::string::size_type position();
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/// \brief Set the current position of the reader
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void set_position(std::string::size_type position);
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static size_t utf8_length(const std::string& text)
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{
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return utf8_length(text.data(), text.size());
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}
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static size_t utf8_length(const std::string::value_type* text, std::string::size_type length)
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{
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UTF8Reader reader(text, length);
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size_t i = 0;
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while (!reader.is_end())
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{
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reader.next();
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i++;
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}
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return i;
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}
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private:
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std::string::size_type current_position = 0;
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std::string::size_type length = 0;
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const unsigned char *data = nullptr;
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};
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