poco/Foundation/include/Poco/String.h
2006-10-23 15:48:43 +00:00

506 lines
12 KiB
C++

//
// String.h
//
// $Id: //poco/1.2/Foundation/include/Poco/String.h#1 $
//
// Library: Foundation
// Package: Core
// Module: String
//
// String utility functions.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Foundation_String_INCLUDED
#define Foundation_String_INCLUDED
#include "Poco/Foundation.h"
#include <locale>
namespace Poco {
template <class S>
S trimLeft(const S& str)
/// Returns a copy of str with all leading
/// whitespace removed.
{
std::locale loc;
typename S::const_iterator it = str.begin();
typename S::const_iterator end = str.end();
while (it != end && isspace(*it, loc)) ++it;
return S(it, end);
}
template <class S>
S& trimLeftInPlace(S& str)
/// Removes all leading whitespace in str.
{
std::locale loc;
typename S::iterator it = str.begin();
typename S::iterator end = str.end();
while (it != end && isspace(*it, loc)) ++it;
str.erase(str.begin(), it);
return str;
}
template <class S>
S trimRight(const S& str)
/// Returns a copy of str with all trailing
/// whitespace removed.
{
std::locale loc;
int pos = int(str.size()) - 1;
while (pos >= 0 && isspace(str[pos], loc)) --pos;
return S(str, 0, pos + 1);
}
template <class S>
S& trimRightInPlace(S& str)
/// Removes all trailing whitespace in str.
{
std::locale loc;
int pos = int(str.size()) - 1;
while (pos >= 0 && isspace(str[pos], loc)) --pos;
str.resize(pos + 1);
return str;
}
template <class S>
S trim(const S& str)
/// Returns a copy of str with all leading and
/// trailing whitespace removed.
{
std::locale loc;
int first = 0;
int last = int(str.size()) - 1;
while (first <= last && isspace(str[first], loc)) ++first;
while (last >= first && isspace(str[last], loc)) --last;
return S(str, first, last - first + 1);
}
template <class S>
S& trimInPlace(S& str)
/// Removes all leading and trailing whitespace in str.
{
std::locale loc;
int first = 0;
int last = int(str.size()) - 1;
while (first <= last && isspace(str[first], loc)) ++first;
while (last >= first && isspace(str[last], loc)) --last;
str.resize(last + 1);
str.erase(0, first);
return str;
}
template <class S>
S toUpper(const S& str)
/// Returns a copy of str containing all upper-case characters.
{
std::locale loc;
typename S::const_iterator it = str.begin();
typename S::const_iterator end = str.end();
S result;
result.reserve(str.size());
while (it != end) result += toupper(*it++, loc);
return result;
}
template <class S>
S& toUpperInPlace(S& str)
/// Replaces all characters in str with their upper-case counterparts.
{
std::locale loc;
typename S::iterator it = str.begin();
typename S::iterator end = str.end();
while (it != end) { *it = toupper(*it, loc); ++it; }
return str;
}
template <class S>
S toLower(const S& str)
/// Returns a copy of str containing all lower-case characters.
{
std::locale loc;
typename S::const_iterator it = str.begin();
typename S::const_iterator end = str.end();
S result;
result.reserve(str.size());
while (it != end) result += tolower(*it++, loc);
return result;
}
template <class S>
S& toLowerInPlace(S& str)
/// Replaces all characters in str with their lower-case counterparts.
{
std::locale loc;
typename S::iterator it = str.begin();
typename S::iterator end = str.end();
while (it != end) { *it = tolower(*it, loc); ++it; }
return str;
}
#if !defined(POCO_NO_TEMPLATE_ICOMPARE)
template <class S, class It>
int icompare(
const S& str,
typename S::size_type pos,
typename S::size_type n,
It it2,
It end2)
/// Case-insensitive string comparison
{
typename S::size_type sz = str.size();
if (pos > sz) pos = sz;
if (pos + n > sz) n = sz - pos;
It it1 = str.begin() + pos;
It end1 = str.begin() + pos + n;
std::locale loc;
while (it1 != end1 && it2 != end2)
{
typename S::value_type c1 = tolower(*it1, loc);
typename S::value_type c2 = tolower(*it2, loc);
if (c1 < c2)
return -1;
else if (c1 > c2)
return 1;
++it1; ++it2;
}
if (it1 == end1)
return it2 == end2 ? 0 : -1;
else
return 1;
}
template <class S>
int icompare(const S& str1, const S& str2)
{
return icompare(str1, 0, str1.size(), str2.begin(), str2.end());
}
template <class S>
int icompare(const S& str1, typename S::size_type n1, const S& str2, typename S::size_type n2)
{
if (n2 > str2.size()) n2 = str2.size();
return icompare(str1, 0, n1, str2.begin(), str2.begin() + n2);
}
template <class S>
int icompare(const S& str1, typename S::size_type n, const S& str2)
{
if (n > str2.size()) n = str2.size();
return icompare(str1, 0, n, str2.begin(), str2.begin() + n);
}
template <class S>
int icompare(const S& str1, typename S::size_type pos, typename S::size_type n, const S& str2)
{
return icompare(str1, pos, n, str2.begin(), str2.end());
}
template <class S>
int icompare(
const S& str1,
typename S::size_type pos1,
typename S::size_type n1,
const S& str2,
typename S::size_type pos2,
typename S::size_type n2)
{
typename S::size_type sz2 = str2.size();
if (pos2 > sz2) pos2 = sz2;
if (pos2 + n2 > sz2) n2 = sz2 - pos2;
return icompare(str1, pos1, n1, str2.begin() + pos2, str2.begin() + pos2 + n2);
}
template <class S>
int icompare(
const S& str1,
typename S::size_type pos1,
typename S::size_type n,
const S& str2,
typename S::size_type pos2)
{
typename S::size_type sz2 = str2.size();
if (pos2 > sz2) pos2 = sz2;
if (pos2 + n > sz2) n = sz2 - pos2;
return icompare(str1, pos1, n, str2.begin() + pos2, str2.begin() + pos2 + n);
}
template <class S>
int icompare(
const S& str,
typename S::size_type pos,
typename S::size_type n,
const typename S::value_type* ptr)
{
poco_check_ptr (ptr);
typename S::size_type sz = str.size();
if (pos > sz) pos = sz;
if (pos + n > sz) n = sz - pos;
typename S::const_iterator it = str.begin() + pos;
typename S::const_iterator end = str.begin() + pos + n;
std::locale loc;
while (it != end && *ptr)
{
typename S::value_type c1 = tolower(*it, loc);
typename S::value_type c2 = tolower(*ptr, loc);
if (c1 < c2)
return -1;
else if (c1 > c2)
return 1;
++it; ++ptr;
}
if (it == end)
return *ptr == 0 ? 0 : -1;
else
return 1;
}
template <class S>
int icompare(
const S& str,
typename S::size_type pos,
const typename S::value_type* ptr)
{
return icompare(str, pos, str.size() - pos, ptr);
}
template <class S>
int icompare(
const S& str,
const typename S::value_type* ptr)
{
return icompare(str, 0, str.size(), ptr);
}
#else
int Foundation_API icompare(const std::string& str, std::string::size_type pos, std::string::size_type n, std::string::const_iterator it2, std::string::const_iterator end2);
int Foundation_API icompare(const std::string& str1, const std::string& str2);
int Foundation_API icompare(const std::string& str1, std::string::size_type n1, const std::string& str2, std::string::size_type n2);
int Foundation_API icompare(const std::string& str1, std::string::size_type n, const std::string& str2);
int Foundation_API icompare(const std::string& str1, std::string::size_type pos, std::string::size_type n, const std::string& str2);
int Foundation_API icompare(const std::string& str1, std::string::size_type pos1, std::string::size_type n1, const std::string& str2, std::string::size_type pos2, std::string::size_type n2);
int Foundation_API icompare(const std::string& str1, std::string::size_type pos1, std::string::size_type n, const std::string& str2, std::string::size_type pos2);
int Foundation_API icompare(const std::string& str, std::string::size_type pos, std::string::size_type n, const std::string::value_type* ptr);
int Foundation_API icompare(const std::string& str, std::string::size_type pos, const std::string::value_type* ptr);
int Foundation_API icompare(const std::string& str, const std::string::value_type* ptr);
#endif
template <class S>
S translate(const S& str, const S& from, const S& to)
/// Returns a copy of str with all characters in
/// from replaced by the corresponding (by position)
/// characters in to. If there is no corresponding
/// character in to, the character is removed from
/// the copy.
{
S result;
result.reserve(str.size());
typename S::const_iterator it = str.begin();
typename S::const_iterator end = str.end();
typename S::size_type toSize = to.size();
while (it != end)
{
typename S::size_type pos = from.find(*it);
if (pos == S::npos)
{
result += *it;
}
else
{
if (pos < toSize) result += to[pos];
}
++it;
}
return result;
}
template <class S>
S translate(const S& str, const typename S::value_type* from, const typename S::value_type* to)
{
poco_check_ptr (from);
poco_check_ptr (to);
return translate(str, S(from), S(to));
}
template <class S>
S& translateInPlace(S& str, const S& from, const S& to)
/// Replaces in str all occurences of characters in from
/// with the corresponding (by position) characters in to.
/// If there is no corresponding character, the character
/// is removed.
{
str = translate(str, from, to);
return str;
}
template <class S>
S translateInPlace(S& str, const typename S::value_type* from, const typename S::value_type* to)
{
poco_check_ptr (from);
poco_check_ptr (to);
str = translate(str, S(from), S(to));
return str;
}
template <class S>
S cat(const S& s1, const S& s2)
/// Concatenates two strings.
{
S result = s1;
result.reserve(s1.size() + s2.size());
result.append(s2);
return result;
}
template <class S>
S cat(const S& s1, const S& s2, const S& s3)
/// Concatenates three strings.
{
S result = s1;
result.reserve(s1.size() + s2.size() + s3.size());
result.append(s2);
result.append(s3);
return result;
}
template <class S>
S cat(const S& s1, const S& s2, const S& s3, const S& s4)
/// Concatenates four strings.
{
S result = s1;
result.reserve(s1.size() + s2.size() + s3.size() + s4.size());
result.append(s2);
result.append(s3);
result.append(s4);
return result;
}
template <class S>
S cat(const S& s1, const S& s2, const S& s3, const S& s4, const S& s5)
/// Concatenates five strings.
{
S result = s1;
result.reserve(s1.size() + s2.size() + s3.size() + s4.size() + s5.size());
result.append(s2);
result.append(s3);
result.append(s4);
result.append(s5);
return result;
}
template <class S>
S cat(const S& s1, const S& s2, const S& s3, const S& s4, const S& s5, const S& s6)
/// Concatenates six strings.
{
S result = s1;
result.reserve(s1.size() + s2.size() + s3.size() + s4.size() + s5.size() + s6.size());
result.append(s2);
result.append(s3);
result.append(s4);
result.append(s5);
result.append(s6);
return result;
}
template <class S, class It>
S cat(const S& delim, const It& begin, const It& end)
/// Concatenates a sequence of strings, delimited
/// by the string given in delim.
{
S result;
for (It it = begin; it != end; ++it)
{
if (!result.empty()) result.append(delim);
result += *it;
}
return result;
}
} // namespace Poco
#endif // Foundation_String_INCLUDED