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#pragma once
#include <string>
#include <algorithm>
namespace string
{
/**
* Removes all characters from the beginning of the string matching the given predicate,
* modifying the given string in-place.
*/
template<typename Predicate>
static inline void trim_left_if(std::string& subject, Predicate predicate)
{
// Erase everything from the beginning up to the first character
// that is not matching the predicate (e.g. is not a space)
subject.erase(subject.begin(),
std::find_if(subject.begin(), subject.end(), [&](char ch) { return !predicate(ch); }));
}
/**
* Removes all characters from the end of the string matching the given predicate,
* modifying the given string in-place.
*/
template<typename Predicate>
static inline void trim_right_if(std::string& subject, Predicate predicate)
{
// Erase everything from the end up to the nearest-to-last character
// that is not matching the predicate (e.g. is not a space)
subject.erase(
std::find_if(subject.rbegin(), subject.rend(), [&](char ch) { return !predicate(ch); }).base(),
subject.end());
}
/**
* Removes all characters from the beginning and the end of the string
* matching the given predicate, returning a new string containing of the result.
*/
template<typename Predicate>
static inline std::string trim_copy_if(std::string subject, Predicate predicate)
{
trim_left_if(subject, predicate);
trim_right_if(subject, predicate);
return subject;
}
/**
* Removes all space characters from the beginning and the end of the string, in-place.
*/
inline void trim(std::string& subject)
{
trim_left_if(subject, ::isspace);
trim_right_if(subject, ::isspace);
}
/**
* Removes all space characters from the beginning and the end of the string
* and returns a new string containing of the result.
*/
inline std::string trim_copy(std::string subject)
{
trim_left_if(subject, ::isspace);
trim_right_if(subject, ::isspace);
return subject;
}
/**
* Removes all of the given characters from the beginning and the end of the subject, in-place.
*/
inline void trim(std::string& subject, const std::string& charsToBeRemoved)
{
trim_left_if(subject, [&](char ch) { return charsToBeRemoved.find(ch) != std::string::npos; });
trim_right_if(subject, [&](char ch) { return charsToBeRemoved.find(ch) != std::string::npos; });
}
/**
* Removes all of the given characters from the beginning and the end of the subject,
* returning a new string containing the result.
*/
inline std::string trim_copy(std::string subject, const std::string& charsToBeRemoved)
{
trim_left_if(subject, [&](char ch) { return charsToBeRemoved.find(ch) != std::string::npos; });
trim_right_if(subject, [&](char ch) { return charsToBeRemoved.find(ch) != std::string::npos; });
return subject;
}
/**
* Removes all of the given characters from the beginning of the subject, in-place
*/
inline void trim_left(std::string& subject, const std::string& charsToBeRemoved)
{
trim_left_if(subject, [&](char ch) { return charsToBeRemoved.find(ch) != std::string::npos; });
}
/**
* Removes all of the given characters from the beginning of the subject,
* returning a new string containing the result.
*/
inline std::string trim_left_copy(std::string subject, const std::string& charsToBeRemoved)
{
trim_left_if(subject, [&](char ch) { return charsToBeRemoved.find(ch) != std::string::npos; });
return subject;
}
/**
* Removes all of the given characters from the end of the subject, in-place
*/
inline void trim_right(std::string& subject, const std::string& charsToBeRemoved)
{
trim_right_if(subject, [&](char ch) { return charsToBeRemoved.find(ch) != std::string::npos; });
}
/**
* Removes all of the given characters from the end of the subject,
* returning a new string containing the result.
*/
inline std::string trim_right_copy(std::string subject, const std::string& charsToBeRemoved)
{
trim_right_if(subject, [&](char ch) { return charsToBeRemoved.find(ch) != std::string::npos; });
return subject;
}
}
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