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//------------------------------------------------------------------------------
// This file is part of the OpenStructure project <www.openstructure.org>
//
// Copyright (C) 2008-2020 by the OpenStructure authors
//
// This library is free software; you can redistribute it and/or modify it under
// the terms of the GNU Lesser General Public License as published by the Free
// Software Foundation; either version 3.0 of the License, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
// details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this library; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//------------------------------------------------------------------------------
#ifndef OST_STRING_REF_HH
#define OST_STRING_REF_HH
/*
Author: Marco Biasini
*/
#include <ctype.h>
#include <cassert>
#include <iostream>
#include <ost/base.hh>
#include <string.h>
#include <vector>
#include <ost/module_config.hh>
namespace ost {
/// \brief convenient datatype for referencing character data
/// \note it is not in general safe to store a StringRef as it does not
/// guarantee that the character data it points to stays alive.
class DLLEXPORT_OST_BASE StringRef {
public:
typedef char* iterator;
typedef const char* const_iterator;
typedef char value_type;
StringRef(const char* begin, size_t len): begin_(begin), end_(begin+len) { }
StringRef(): begin_(NULL), end_(NULL) { }
const char* begin() const { return begin_; }
const char* end() const { return end_; }
const char* data() const { return begin_; }
size_t size() const { return end_-begin_; }
size_t length() const { return this->size(); }
char front() const
{
assert(!this->empty());
return *begin_;
}
/// \brief find character in StringRef
/// \return iterator position when found, else iterator pointing to the end
const_iterator find(char p) const {
const char* s=begin_;
while (s!=end_) {
if (*s==p) {
return s;
}
++s;
}
return s;
}
/// \brief returns a substring of the string
///
/// \param pos the starting position of the substring
/// \param n is the length of the string. if std::string::npos, the
/// substring goes from \p pos to the end of the string
/// The function does on purpose not perform any boundary check in release
/// mode. It's the duty of the caller to make sure the string has the required
/// length.
StringRef substr(size_t pos, size_t n=std::string::npos) const
{
if (n==std::string::npos) {
assert(begin_+pos<=end_);
return StringRef(begin_+pos, this->length()-pos);
} else {
assert(begin_+pos+n<=end_);
return StringRef(begin_+pos, n);
}
}
std::string str() const
{
return std::string(begin_, end_-begin_);
}
char back() const
{
assert(!this->empty());
return *(end_-1);
}
const char& operator[](int index) const { return begin_[index]; }
bool operator==(const StringRef& rhs) const {
return this->length()==rhs.length() &&
!memcmp(rhs.data(), this->data(), this->size());
}
bool operator!=(const StringRef& rhs) const {
return !this->operator==(rhs);
}
/// \brief strip space characters on the right
StringRef rtrim() const {
const char* s=end_;
while(--s>=begin_ && isspace(*s)) {
}
return StringRef(begin_, s+1-begin_);
}
/// \brief strip space characters on the left
StringRef ltrim() const {
const char* s=begin_;
while(s<end_ && isspace(*s)) {
++s;
}
return StringRef(s, end_-s);
}
/// \brief strip space characters on the left and the right
StringRef trim() const {
return this->rtrim().ltrim();
}
/// \brief convert to integer
/// \return a tuple with \c first set to true and \c second set to
/// the int if the conversion succeeds. If the conversion fails,
/// \c first is set to false.
std::pair<bool, int> to_int() const;
/// \brief convert to float
/// \return a tuple with \c first set to true and \c second set to
/// the float if the conversion succeeds. If the conversion fails,
/// \c first is set to false.
std::pair<bool, float> to_float() const;
bool empty() const { return begin_==end_; }
/// \brief split string into chunks delimited by \p p
std::vector<StringRef> split(char p) const;
/// \brief split string into chunks delimited by whitespace
std::vector<StringRef> split() const;
/// \brief returns a new string with all whitespace removed from
/// this StringRef
std::string str_no_whitespace() const;
private:
const char* begin_;
const char* end_;
};
//std::stringstream& operator<<(std::stringstream& stream, const StringRef& strref);
DLLEXPORT_OST_BASE std::ostream& operator<<(std::ostream& stream, const StringRef& strref);
}
#endif
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