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tokenizer.hpp
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tokenizer.hpp
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#pragma once
#include <vector>
#include <deque>
#include <string>
#include <string_view>
#include <algorithm>
template<typename Token_Type>
using token_vector = std::deque<Token_Type>;
inline bool try_match_token(const std::string_view& raw, const std::string_view& to_match)
{
/* Can't match if smaller. */
if (raw.size() < to_match.size()) return false;
/* If perfect match, return true. */
return std::memcmp(static_cast<void const*>(raw.data()), static_cast<void const*>(to_match.data()), to_match.size()) == 0;
}
template<typename TokenType, typename Token>
token_vector<Token> tokenize(const std::string_view& raw, const token_vector<Token> tokens, const std::vector<TokenType>& to_ignore = std::vector<TokenType>())
{
token_vector<Token> out;
std::uint64_t symbol_end_index = 0;
std::uint64_t symbol_start_index = 0;
auto check_for_symbol = [&]()
{
if (symbol_end_index > 0)
{
// Symbol we need to save.
out.emplace_back(
TokenType::symbol,
std::string(raw.substr(symbol_start_index, symbol_end_index - symbol_start_index))
);
symbol_end_index = 0;
symbol_start_index = 0;
}
};
for (std::uint64_t i = 0; i < raw.size(); i++)
{
auto sub = raw.substr(i);
bool found_token = false;
for(auto& possible_token : tokens)
{
if(try_match_token(sub, possible_token.text))
{
check_for_symbol();
// found token...
if(std::find(to_ignore.begin(), to_ignore.end(), possible_token.type) == to_ignore.end())
out.push_back(possible_token);
i += possible_token.text.size() - 1;
found_token = true;
break;
}
}
if(!found_token)
{
if (symbol_end_index == 0) {
symbol_start_index = i;
symbol_end_index = i;
}
symbol_end_index++;
}
}
check_for_symbol();
return out;
}