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RequiredTokenAccessor.h
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RequiredTokenAccessor.h
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#pragma once
#include "Token.h"
#include "Sentence.h"
#include <string>
#include <cstdlib>
#include <stdexcept>
#include <initializer_list>
#include <set>
class RequiredTokenAccessor
{
public:
RequiredTokenAccessor(const std::initializer_list<std::string>& values)
: values(values)
{
}
Token operator()(const Sentence& sentence, std::size_t index) const
{
if (index >= sentence.GetNodes().size())
throw std::runtime_error("Index outside of sentence.");
auto& token = sentence.GetNodes()[index]->AsToken();
if (values.empty())
return token;
for (auto& value : values)
if (token == value)
return token;
throw std::runtime_error("Unexpected token.");
}
private:
std::set<std::string> values;
};
template <typename... String>
inline RequiredTokenAccessor RequiredToken(String... values)
{
return{ values... };
}