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#pragma once
#include "Base.hpp"
namespace cru {
using CodePoint = std::int32_t;
constexpr CodePoint k_code_point_end = -1;
class TextEncodeException : public std::runtime_error {
public:
using runtime_error::runtime_error;
};
class Utf8Iterator : public Object {
public:
explicit Utf8Iterator(const std::string_view& string) : string_(string) {}
Utf8Iterator(const std::string_view& string, Index position)
: string_(string), position_(position) {}
CRU_DEFAULT_COPY(Utf8Iterator)
CRU_DEFAULT_MOVE(Utf8Iterator)
~Utf8Iterator() = default;
public:
void SetToHead() { position_ = 0; }
void SetPosition(Index position) { position_ = position; }
// Advance current position and get next code point. Return k_code_point_end
// if there is no next code unit(point). Throw TextEncodeException if decoding
// fails.
CodePoint Next();
Index CurrentPosition() const { return this->position_; }
private:
std::string_view string_;
Index position_ = 0;
};
} // namespace cru
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