144 lines
3.8 KiB
C++
144 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include <string>
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#include <utility>
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#include <vector>
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/**
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* Stores an offset and a length into the single underlying string of StringVector.
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*/
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struct StringToken
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{
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std::size_t _index;
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std::size_t _length;
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StringToken() = default;
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StringToken(std::size_t index, std::size_t length)
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: _index(index),
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_length(length)
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{
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}
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};
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/**
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* Safe wrapper around an std::vector<std::string>. Gives you an empty string if you would read past
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* the ends of the vector.
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*/
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class StringVector
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{
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/// All tokens are substrings of this string.
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std::string _string;
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std::vector<StringToken> _tokens;
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public:
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explicit StringVector() = default;
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explicit StringVector(std::string string, std::vector<StringToken> tokens)
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: _string(std::move(string))
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, _tokens(std::move(tokens))
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{
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}
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/// Unlike std::vector, gives an empty string if index is unexpected.
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std::string operator[](std::size_t index) const
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{
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if (index >= _tokens.size())
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{
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return std::string();
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}
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const StringToken& token = _tokens[index];
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return _string.substr(token._index, token._length);
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}
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std::size_t size() const { return _tokens.size(); }
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bool empty() const { return _tokens.empty(); }
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std::vector<StringToken>::const_iterator begin() const { return _tokens.begin(); }
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std::vector<StringToken>::iterator begin() { return _tokens.begin(); }
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std::vector<StringToken>::const_iterator end() const { return _tokens.end(); }
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std::vector<StringToken>::iterator end() { return _tokens.end(); }
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std::vector<StringToken>::iterator erase(std::vector<StringToken>::const_iterator it)
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{
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return _tokens.erase(it);
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}
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void push_back(const std::string& string)
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{
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_tokens.emplace_back(_string.size(), string.size());
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_string += string;
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}
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/// Gets the underlying string of a single token.
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std::string getParam(const StringToken& token) const
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{
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return _string.substr(token._index, token._length);
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}
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/// Concats tokens starting from begin, using separator as separator.
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template <typename T> inline std::string cat(const T& separator, std::size_t offset) const
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{
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std::string ret;
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if (offset >= _tokens.size())
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{
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return ret;
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}
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ret.reserve(_string.size() * 2);
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auto it = _tokens.begin() + offset;
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ret = getParam(*it);
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for (++it; it != _tokens.end(); ++it)
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{
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// Avoid temporary strings, append separately.
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ret += separator;
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ret += getParam(*it);
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}
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return ret;
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}
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/// Compares the nth token with string.
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bool equals(std::size_t index, const char* string) const
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{
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if (index >= _tokens.size())
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{
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return false;
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}
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const StringToken& token = _tokens[index];
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return _string.compare(token._index, token._length, string) == 0;
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}
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/// Compares the nth token with string.
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template <std::size_t N>
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bool equals(std::size_t index, const char (&string)[N]) const
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{
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if (index >= _tokens.size())
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{
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return false;
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}
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const StringToken& token = _tokens[index];
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return _string.compare(token._index, token._length, string, N) == 0;
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}
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/// Compares the nth token with the mth token from an other StringVector.
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bool equals(std::size_t index, const StringVector& other, std::size_t otherIndex);
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};
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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