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725 lines
18 KiB
C++
725 lines
18 KiB
C++
//
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// String.h
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//
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// Library: Foundation
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// Package: Core
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// Module: String
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//
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// String utility functions.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_String_INCLUDED
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#define Foundation_String_INCLUDED
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#include "Poco/Foundation.h"
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#include "Poco/Ascii.h"
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#include <cstring>
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#include <algorithm>
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namespace Poco {
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template <class S>
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S trimLeft(const S& str)
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/// Returns a copy of str with all leading
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/// whitespace removed.
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{
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typename S::const_iterator it = str.begin();
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typename S::const_iterator end = str.end();
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while (it != end && Ascii::isSpace(*it)) ++it;
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return S(it, end);
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}
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template <class S>
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S& trimLeftInPlace(S& str)
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/// Removes all leading whitespace in str.
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{
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typename S::iterator it = str.begin();
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typename S::iterator end = str.end();
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while (it != end && Ascii::isSpace(*it)) ++it;
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str.erase(str.begin(), it);
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return str;
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}
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template <class S>
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S trimRight(const S& str)
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/// Returns a copy of str with all trailing
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/// whitespace removed.
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{
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std::ptrdiff_t pos = static_cast<std::ptrdiff_t>(str.size()) - 1;
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while (pos >= 0 && Ascii::isSpace(str[pos])) --pos;
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return S(str, 0, pos + 1);
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}
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template <class S>
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S& trimRightInPlace(S& str)
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/// Removes all trailing whitespace in str.
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{
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std::ptrdiff_t pos = static_cast<std::ptrdiff_t>(str.size()) - 1;
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while (pos >= 0 && Ascii::isSpace(str[pos])) --pos;
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str.resize(pos + 1);
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return str;
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}
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template <class S>
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S trim(const S& str)
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/// Returns a copy of str with all leading and
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/// trailing whitespace removed.
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{
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std::ptrdiff_t first = 0;
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std::ptrdiff_t last = static_cast<std::ptrdiff_t>(str.size()) - 1;
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while (first <= last && Ascii::isSpace(str[first])) ++first;
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while (last >= first && Ascii::isSpace(str[last])) --last;
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return S(str, first, last - first + 1);
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}
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template <class S>
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S& trimInPlace(S& str)
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/// Removes all leading and trailing whitespace in str.
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{
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std::ptrdiff_t first = 0;
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std::ptrdiff_t last = static_cast<std::ptrdiff_t>(str.size()) - 1;
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while (first <= last && Ascii::isSpace(str[first])) ++first;
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while (last >= first && Ascii::isSpace(str[last])) --last;
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if (last >= 0)
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{
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str.resize(last + 1);
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str.erase(0, first);
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}
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return str;
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}
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template <class S>
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S toUpper(const S& str)
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/// Returns a copy of str containing all upper-case characters.
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{
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typename S::const_iterator it = str.begin();
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typename S::const_iterator end = str.end();
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S result;
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result.reserve(str.size());
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while (it != end) result += static_cast<typename S::value_type>(Ascii::toUpper(*it++));
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return result;
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}
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template <class S>
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S& toUpperInPlace(S& str)
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/// Replaces all characters in str with their upper-case counterparts.
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{
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typename S::iterator it = str.begin();
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typename S::iterator end = str.end();
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while (it != end) { *it = static_cast<typename S::value_type>(Ascii::toUpper(*it)); ++it; }
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return str;
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}
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template <class S>
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S toLower(const S& str)
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/// Returns a copy of str containing all lower-case characters.
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{
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typename S::const_iterator it = str.begin();
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typename S::const_iterator end = str.end();
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S result;
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result.reserve(str.size());
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while (it != end) result += static_cast<typename S::value_type>(Ascii::toLower(*it++));
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return result;
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}
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template <class S>
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S& toLowerInPlace(S& str)
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/// Replaces all characters in str with their lower-case counterparts.
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{
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typename S::iterator it = str.begin();
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typename S::iterator end = str.end();
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while (it != end) { *it = static_cast<typename S::value_type>(Ascii::toLower(*it)); ++it; }
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return str;
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}
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#if !defined(POCO_NO_TEMPLATE_ICOMPARE)
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template <class S, class It>
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int icompare(
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const S& str,
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typename S::size_type pos,
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typename S::size_type n,
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It it2,
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It end2)
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/// Case-insensitive string comparison
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{
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typename S::size_type sz = str.size();
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if (pos > sz) pos = sz;
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if (pos + n > sz) n = sz - pos;
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It it1 = str.begin() + pos;
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It end1 = str.begin() + pos + n;
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while (it1 != end1 && it2 != end2)
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{
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typename S::value_type c1(static_cast<typename S::value_type>(Ascii::toLower(*it1)));
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typename S::value_type c2(static_cast<typename S::value_type>(Ascii::toLower(*it2)));
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if (c1 < c2)
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return -1;
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else if (c1 > c2)
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return 1;
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++it1; ++it2;
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}
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if (it1 == end1)
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return it2 == end2 ? 0 : -1;
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else
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return 1;
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}
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template <class S>
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int icompare(const S& str1, const S& str2)
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// A special optimization for an often used case.
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{
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typename S::const_iterator it1(str1.begin());
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typename S::const_iterator end1(str1.end());
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typename S::const_iterator it2(str2.begin());
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typename S::const_iterator end2(str2.end());
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while (it1 != end1 && it2 != end2)
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{
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typename S::value_type c1(static_cast<typename S::value_type>(Ascii::toLower(*it1)));
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typename S::value_type c2(static_cast<typename S::value_type>(Ascii::toLower(*it2)));
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if (c1 < c2)
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return -1;
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else if (c1 > c2)
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return 1;
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++it1; ++it2;
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}
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if (it1 == end1)
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return it2 == end2 ? 0 : -1;
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else
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return 1;
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}
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template <class S>
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int icompare(const S& str1, typename S::size_type n1, const S& str2, typename S::size_type n2)
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{
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if (n2 > str2.size()) n2 = str2.size();
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return icompare(str1, 0, n1, str2.begin(), str2.begin() + n2);
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}
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template <class S>
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int icompare(const S& str1, typename S::size_type n, const S& str2)
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{
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if (n > str2.size()) n = str2.size();
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return icompare(str1, 0, n, str2.begin(), str2.begin() + n);
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}
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template <class S>
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int icompare(const S& str1, typename S::size_type pos, typename S::size_type n, const S& str2)
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{
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return icompare(str1, pos, n, str2.begin(), str2.end());
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}
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template <class S>
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int icompare(
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const S& str1,
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typename S::size_type pos1,
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typename S::size_type n1,
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const S& str2,
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typename S::size_type pos2,
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typename S::size_type n2)
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{
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typename S::size_type sz2 = str2.size();
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if (pos2 > sz2) pos2 = sz2;
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if (pos2 + n2 > sz2) n2 = sz2 - pos2;
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return icompare(str1, pos1, n1, str2.begin() + pos2, str2.begin() + pos2 + n2);
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}
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template <class S>
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int icompare(
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const S& str1,
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typename S::size_type pos1,
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typename S::size_type n,
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const S& str2,
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typename S::size_type pos2)
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{
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typename S::size_type sz2 = str2.size();
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if (pos2 > sz2) pos2 = sz2;
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if (pos2 + n > sz2) n = sz2 - pos2;
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return icompare(str1, pos1, n, str2.begin() + pos2, str2.begin() + pos2 + n);
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}
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template <class S>
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int icompare(
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const S& str,
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typename S::size_type pos,
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typename S::size_type n,
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const typename S::value_type* ptr)
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{
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poco_check_ptr (ptr);
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typename S::size_type sz = str.size();
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if (pos > sz) pos = sz;
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if (pos + n > sz) n = sz - pos;
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typename S::const_iterator it = str.begin() + pos;
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typename S::const_iterator end = str.begin() + pos + n;
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while (it != end && *ptr)
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{
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typename S::value_type c1(static_cast<typename S::value_type>(Ascii::toLower(*it)));
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typename S::value_type c2(static_cast<typename S::value_type>(Ascii::toLower(*ptr)));
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if (c1 < c2)
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return -1;
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else if (c1 > c2)
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return 1;
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++it; ++ptr;
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}
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if (it == end)
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return *ptr == 0 ? 0 : -1;
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else
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return 1;
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}
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template <class S>
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int icompare(
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const S& str,
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typename S::size_type pos,
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const typename S::value_type* ptr)
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{
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return icompare(str, pos, str.size() - pos, ptr);
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}
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template <class S>
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int icompare(
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const S& str,
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const typename S::value_type* ptr)
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{
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return icompare(str, 0, str.size(), ptr);
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}
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#else
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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);
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int Foundation_API icompare(const std::string& str1, const std::string& str2);
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int Foundation_API icompare(const std::string& str1, std::string::size_type n1, const std::string& str2, std::string::size_type n2);
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int Foundation_API icompare(const std::string& str1, std::string::size_type n, const std::string& str2);
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int Foundation_API icompare(const std::string& str1, std::string::size_type pos, std::string::size_type n, const std::string& str2);
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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);
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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);
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int Foundation_API icompare(const std::string& str, std::string::size_type pos, std::string::size_type n, const std::string::value_type* ptr);
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int Foundation_API icompare(const std::string& str, std::string::size_type pos, const std::string::value_type* ptr);
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int Foundation_API icompare(const std::string& str, const std::string::value_type* ptr);
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#endif
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template <class S>
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S translate(const S& str, const S& from, const S& to)
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/// Returns a copy of str with all characters in
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/// from replaced by the corresponding (by position)
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/// characters in to. If there is no corresponding
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/// character in to, the character is removed from
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/// the copy.
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{
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S result;
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result.reserve(str.size());
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typename S::const_iterator it = str.begin();
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typename S::const_iterator end = str.end();
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typename S::size_type toSize = to.size();
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while (it != end)
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{
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typename S::size_type pos = from.find(*it);
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if (pos == S::npos)
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{
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result += *it;
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}
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else
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{
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if (pos < toSize) result += to[pos];
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}
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++it;
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}
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return result;
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}
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template <class S>
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S translate(const S& str, const typename S::value_type* from, const typename S::value_type* to)
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{
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poco_check_ptr (from);
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poco_check_ptr (to);
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return translate(str, S(from), S(to));
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}
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template <class S>
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S& translateInPlace(S& str, const S& from, const S& to)
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/// Replaces in str all occurrences of characters in from
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/// with the corresponding (by position) characters in to.
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/// If there is no corresponding character, the character
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/// is removed.
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{
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str = translate(str, from, to);
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return str;
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}
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template <class S>
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S translateInPlace(S& str, const typename S::value_type* from, const typename S::value_type* to)
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{
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poco_check_ptr (from);
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poco_check_ptr (to);
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str = translate(str, S(from), S(to));
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#if defined(__SUNPRO_CC)
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// Fix around the RVO bug in SunStudio 12.4
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S ret(str);
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return ret;
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#else
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return str;
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#endif
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}
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#if !defined(POCO_NO_TEMPLATE_ICOMPARE)
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template <class S>
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S& replaceInPlace(S& str, const S& from, const S& to, typename S::size_type start = 0)
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{
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poco_assert (from.size() > 0);
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S result;
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typename S::size_type pos = 0;
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result.append(str, 0, start);
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do
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{
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pos = str.find(from, start);
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if (pos != S::npos)
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{
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result.append(str, start, pos - start);
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result.append(to);
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start = pos + from.length();
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}
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else result.append(str, start, str.size() - start);
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}
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while (pos != S::npos);
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str.swap(result);
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return str;
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}
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template <class S>
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S& replaceInPlace(S& str, const typename S::value_type* from, const typename S::value_type* to, typename S::size_type start = 0)
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{
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poco_assert (*from);
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S result;
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typename S::size_type pos = 0;
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typename S::size_type fromLen = std::strlen(from);
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result.append(str, 0, start);
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do
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{
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pos = str.find(from, start);
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if (pos != S::npos)
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{
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result.append(str, start, pos - start);
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result.append(to);
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start = pos + fromLen;
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}
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else result.append(str, start, str.size() - start);
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}
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while (pos != S::npos);
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str.swap(result);
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return str;
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}
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template <class S>
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S& replaceInPlace(S& str, const typename S::value_type from, const typename S::value_type to = 0, typename S::size_type start = 0)
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{
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if (from == to) return str;
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typename S::size_type pos = 0;
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do
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{
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pos = str.find(from, start);
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if (pos != S::npos)
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{
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if (to) str[pos] = to;
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else str.erase(pos, 1);
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}
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} while (pos != S::npos);
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return str;
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}
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template <class S>
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S& removeInPlace(S& str, const typename S::value_type ch, typename S::size_type start = 0)
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{
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return replaceInPlace(str, ch, 0, start);
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}
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template <class S>
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S replace(const S& str, const S& from, const S& to, typename S::size_type start = 0)
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/// Replace all occurrences of from (which must not be the empty string)
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/// in str with to, starting at position start.
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{
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S result(str);
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replaceInPlace(result, from, to, start);
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return result;
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}
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template <class S>
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S replace(const S& str, const typename S::value_type* from, const typename S::value_type* to, typename S::size_type start = 0)
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{
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S result(str);
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replaceInPlace(result, from, to, start);
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return result;
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}
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template <class S>
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S replace(const S& str, const typename S::value_type from, const typename S::value_type to = 0, typename S::size_type start = 0)
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{
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S result(str);
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replaceInPlace(result, from, to, start);
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return result;
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}
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template <class S>
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S remove(const S& str, const typename S::value_type ch, typename S::size_type start = 0)
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{
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S result(str);
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replaceInPlace(result, ch, 0, start);
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return result;
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}
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#else
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Foundation_API std::string replace(const std::string& str, const std::string& from, const std::string& to, std::string::size_type start = 0);
|
|
Foundation_API std::string replace(const std::string& str, const std::string::value_type* from, const std::string::value_type* to, std::string::size_type start = 0);
|
|
Foundation_API std::string replace(const std::string& str, const std::string::value_type from, const std::string::value_type to = 0, std::string::size_type start = 0);
|
|
Foundation_API std::string remove(const std::string& str, const std::string::value_type ch, std::string::size_type start = 0);
|
|
Foundation_API std::string& replaceInPlace(std::string& str, const std::string& from, const std::string& to, std::string::size_type start = 0);
|
|
Foundation_API std::string& replaceInPlace(std::string& str, const std::string::value_type* from, const std::string::value_type* to, std::string::size_type start = 0);
|
|
Foundation_API std::string& replaceInPlace(std::string& str, const std::string::value_type from, const std::string::value_type to = 0, std::string::size_type start = 0);
|
|
Foundation_API std::string& removeInPlace(std::string& str, const std::string::value_type ch, std::string::size_type start = 0);
|
|
|
|
|
|
#endif
|
|
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
template <class S>
|
|
bool startsWith(const S& str, const S& prefix)
|
|
/// Tests whether the string starts with the given prefix.
|
|
{
|
|
return str.size() >= prefix.size() && equal(prefix.begin(), prefix.end(), str.begin());
|
|
}
|
|
|
|
|
|
template <class S>
|
|
bool endsWith(const S& str, const S& suffix)
|
|
/// Tests whether the string ends with the given suffix.
|
|
{
|
|
return str.size() >= suffix.size() && equal(suffix.rbegin(), suffix.rend(), str.rbegin());
|
|
}
|
|
|
|
|
|
//
|
|
// case-insensitive string equality
|
|
//
|
|
|
|
|
|
template <typename charT>
|
|
struct i_char_traits : public std::char_traits<charT>
|
|
{
|
|
inline static bool eq(charT c1, charT c2)
|
|
{
|
|
return Ascii::toLower(c1) == Ascii::toLower(c2);
|
|
}
|
|
|
|
inline static bool ne(charT c1, charT c2)
|
|
{
|
|
return !eq(c1, c2);
|
|
}
|
|
|
|
inline static bool lt(charT c1, charT c2)
|
|
{
|
|
return Ascii::toLower(c1) < Ascii::toLower(c2);
|
|
}
|
|
|
|
static int compare(const charT* s1, const charT* s2, std::size_t n)
|
|
{
|
|
for (int i = 0; i < n && s1 && s2; ++i, ++s1, ++s2)
|
|
{
|
|
if (Ascii::toLower(*s1) == Ascii::toLower(*s2)) continue;
|
|
else if (Ascii::toLower(*s1) < Ascii::toLower(*s2)) return -1;
|
|
else return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const charT* find(const charT* s, int n, charT a)
|
|
{
|
|
while(n-- > 0 && Ascii::toLower(*s) != Ascii::toLower(a)) { ++s; }
|
|
return s;
|
|
}
|
|
};
|
|
|
|
|
|
typedef std::basic_string<char, i_char_traits<char>> istring;
|
|
/// Case-insensitive std::string counterpart.
|
|
|
|
|
|
template<typename T>
|
|
std::size_t isubstr(const T& str, const T& sought)
|
|
/// Case-insensitive substring; searches for a substring
|
|
/// without regards to case.
|
|
{
|
|
typename T::const_iterator it = std::search(str.begin(), str.end(),
|
|
sought.begin(), sought.end(),
|
|
i_char_traits<typename T::value_type>::eq);
|
|
|
|
if (it != str.end()) return it - str.begin();
|
|
else return static_cast<std::size_t>(T::npos);
|
|
}
|
|
|
|
|
|
struct CILess
|
|
/// Case-insensitive less-than functor; useful for standard maps
|
|
/// and sets with std::strings keys and case-insensitive ordering
|
|
/// requirement.
|
|
{
|
|
inline bool operator() (const std::string& s1, const std::string& s2) const
|
|
{
|
|
return icompare(s1, s2) < 0;
|
|
}
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Foundation_String_INCLUDED
|