0fa128bbd0
This patch does a bit of housekeeping on the string helper functions and relies on the C++11 standard library where possible. It also does away with our custom string hash as an implementation is already part of the standard library.
232 lines
6.3 KiB
C++
232 lines
6.3 KiB
C++
/*
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* Copyright (c) 2001-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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* Steve Reinhardt
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*/
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#ifndef __BASE_STR_HH__
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#define __BASE_STR_HH__
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#include <cstring>
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#include <limits>
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#include <locale>
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#include <stdexcept>
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#include <string>
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#include <vector>
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inline void
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eat_lead_white(std::string &s)
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{
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std::string::size_type off = s.find_first_not_of(' ');
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if (off != std::string::npos) {
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std::string::iterator begin = s.begin();
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s.erase(begin, begin + off);
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}
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}
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inline void
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eat_end_white(std::string &s)
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{
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std::string::size_type off = s.find_last_not_of(' ');
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if (off != std::string::npos)
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s.erase(s.begin() + off + 1, s.end());
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}
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inline void
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eat_white(std::string &s)
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{
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eat_lead_white(s);
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eat_end_white(s);
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}
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inline std::string
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to_lower(const std::string &s)
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{
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std::string lower;
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int len = s.size();
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lower.reserve(len);
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for (const auto &c : s)
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lower.push_back(std::tolower(c));
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return lower;
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}
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// Split the string s into lhs and rhs on the first occurence of the
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// character c.
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bool
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split_first(const std::string &s, std::string &lhs, std::string &rhs, char c);
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// Split the string s into lhs and rhs on the last occurence of the
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// character c.
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bool
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split_last(const std::string &s, std::string &lhs, std::string &rhs, char c);
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// Tokenize the string <s> splitting on the character <token>, and
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// place the result in the string vector <vector>. If <ign> is true,
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// then empty result strings (due to trailing tokens, or consecutive
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// tokens) are skipped.
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void
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tokenize(std::vector<std::string> &vector, const std::string &s,
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char token, bool ign = true);
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/**
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* @{
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*
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* @name String to number helper functions for signed and unsigned
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* integeral type, as well as floating-point types.
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*/
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template <class T>
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typename std::enable_if<std::is_integral<T>::value &&
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std::is_signed<T>::value, T>::type
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__to_number(const std::string &value)
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{
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// start big and narrow it down if needed, determine the base dynamically
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long long r = std::stoll(value, nullptr, 0);
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if (r < std::numeric_limits<T>::min() || r > std::numeric_limits<T>::max())
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throw std::out_of_range("Out of range");
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return static_cast<T>(r);
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}
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template <class T>
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typename std::enable_if<std::is_integral<T>::value &&
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!std::is_signed<T>::value, T>::type
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__to_number(const std::string &value)
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{
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// start big and narrow it down if needed, determine the base dynamically
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unsigned long long r = std::stoull(value, nullptr, 0);
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if (r > std::numeric_limits<T>::max())
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throw std::out_of_range("Out of range");
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return static_cast<T>(r);
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}
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template <class T>
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typename std::enable_if<std::is_floating_point<T>::value, T>::type
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__to_number(const std::string &value)
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{
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// start big and narrow it down if needed
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long double r = std::stold(value);
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if (r < std::numeric_limits<T>::min() || r > std::numeric_limits<T>::max())
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throw std::out_of_range("Out of range");
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return static_cast<T>(r);
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}
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/** @} */
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/**
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* Turn a string representation of a number, either integral or
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* floating point, into an actual number.
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*
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* @param value The string representing the number
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* @param retval The resulting value
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* @return True if the parsing was successful
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*/
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template <class T>
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inline bool
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to_number(const std::string &value, T &retval)
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{
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try {
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retval = __to_number<T>(value);
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return true;
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} catch (const std::out_of_range&) {
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return false;
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} catch (const std::invalid_argument&) {
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return false;
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}
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}
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/**
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* Turn a string representation of a boolean into a boolean value.
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*/
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inline bool
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to_bool(const std::string &value, bool &retval)
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{
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std::string s = to_lower(value);
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if (s == "true") {
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retval = true;
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return true;
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} else if (s == "false") {
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retval = false;
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return true;
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}
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return false;
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}
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// Put quotes around string arg if it contains spaces.
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inline std::string
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quote(const std::string &s)
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{
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std::string ret;
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bool quote = s.find(' ') != std::string::npos;
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if (quote)
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ret = '"';
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ret += s;
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if (quote)
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ret += '"';
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return ret;
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}
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/**
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* Return true if 's' starts with the prefix string 'prefix'.
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*/
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inline bool
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startswith(const char *s, const char *prefix)
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{
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return (strncmp(s, prefix, strlen(prefix)) == 0);
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}
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/**
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* Return true if 's' starts with the prefix string 'prefix'.
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*/
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inline bool
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startswith(const std::string &s, const char *prefix)
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{
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return (s.compare(0, strlen(prefix), prefix) == 0);
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}
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/**
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* Return true if 's' starts with the prefix string 'prefix'.
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*/
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inline bool
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startswith(const std::string &s, const std::string &prefix)
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{
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return (s.compare(0, prefix.size(), prefix) == 0);
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}
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#endif //__BASE_STR_HH__
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