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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
// See regex_base.h for more information.
//
// This header creates some concrete instantiations of RegExBase for commonly used scenarios. In
// particular, basic regular expression matching base on the regular expression language described in
// clr::regex::ItemTraitsBase (found in regex_base.h) is instantiated for use with SString, ASCII and
// UNICODE strings (clr::regex::SStringRegex, clr::regex::WSTRRegEx, and clr::regex::STRRegEx
// respectively). Each type definition includes an example of its use.
//
//
#ifndef _REGEX_UTIL_H_
#define _REGEX_UTIL_H_
#ifndef MODE_ANY
#define MODE_ANY
#endif
#include "regex_base.h"
#ifdef _DEBUG
namespace clr
{
namespace regex
{
//=======================================================================================================
// Derives from Group to provide two additional convenience methods (GetSString variants).
class SStringGroup : public Group<SString::CIterator>
{
public:
SStringGroup()
: Group<SString::CIterator>()
{ WRAPPER_NO_CONTRACT; }
SStringGroup(const InputIterator& _start, const InputIterator& _end, bool _isClosed = false)
: Group<SString::CIterator>(_start, _end, _isClosed)
{ WRAPPER_NO_CONTRACT; }
// Since SStrings constructed from ranges require the original source string, this is a required
// input argument. Returns the input substring that matches the corresponding grouping.
SString GetSString(const SString& src)
{ WRAPPER_NO_CONTRACT; return SString(src, Begin(), End()); }
// Since SStrings constructed from ranges require the original source string, this is a required
// input argument. This version takes a target SString as a buffer, and also returns this buffer
// as a reference. Returns the input substring that matches the corresponding grouping.
SString& GetSString(const SString& src, SString& tgt)
{ WRAPPER_NO_CONTRACT; tgt.Set(src, Begin(), End()); return tgt; }
};
//=======================================================================================================
typedef WCHARItemTraits<SString::CIterator> SStringItemTraits;
//=======================================================================================================
// Regular expression matching with SStrings.
//
// Here is an example of how to use SStringRegEx with grouping enabled.
//
// using namespace clr::regex;
// SString input(SL"Simmons"); // usually this is derived from some variable source
// SStringRegEx::GroupingContainer container;
// if (SStringRegEx::Match(SL"(Sim+on)", input, container)) {
// printf("%S", container[1].GetSString(input).GetUnicode());
// }
//
// This sample should result in "Simmon" being printed.
class SStringRegEx : public RegExBase<SStringItemTraits>
{
typedef RegExBase<SStringItemTraits> PARENT_TYPE;
public:
using PARENT_TYPE::Match;
using PARENT_TYPE::Matches;
typedef PARENT_TYPE::InputIterator InputIterator;
typedef GroupContainer<InputIterator, SStringGroup > GroupingContainer;
static bool Match(
const SString& regex,
const SString& input,
GroupingContainer& groups,
MatchFlags flags = DefaultMatchFlags)
{
WRAPPER_NO_CONTRACT;
return Match(regex.Begin(), regex.End(), input.Begin(), input.End(), groups, flags);
}
static bool Matches(
const SString& regex,
const SString& input,
MatchFlags flags = DefaultMatchFlags)
{
WRAPPER_NO_CONTRACT;
return Matches(regex.Begin(), regex.End(), input.Begin(), input.End(), flags);
}
};
//=======================================================================================================
// Regular expression matching with UNICODE strings.
//
// Here is an example of how to use WSTRRegEx to match against a null-terminated string without grouping.
//
// using namespace clr::regex;
// LPCWSTR input = L"Simmons";
// if (WSTRRegEx::Matches(L"Sim+on", input))
// printf("Match succeeded");
// else
// printf("Match failed");
//
// This sample should result in "Match succeeded" being printed.
class WSTRRegEx : public RegExBase<WCHARItemTraits<LPCWSTR> >
{
typedef RegExBase<WCHARItemTraits<LPCWSTR> > PARENT_TYPE;
public:
using PARENT_TYPE::Match;
using PARENT_TYPE::Matches;
static bool Match(
LPCWSTR regex,
LPCWSTR input,
GroupingContainer& groups,
MatchFlags flags = DefaultMatchFlags)
{
WRAPPER_NO_CONTRACT;
return Match(regex, regex + wcslen(regex), input, input + wcslen(input), groups, flags);
}
static bool Matches(
LPCWSTR regex,
LPCWSTR input,
MatchFlags flags = DefaultMatchFlags)
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
} CONTRACTL_END;
return Matches(regex, regex + wcslen(regex), input, input + wcslen(input), flags);
}
};
//=======================================================================================================
// Regular expression matching with ASCII strings.
//
// Here is an example of how to use STRRegEx to match against a substring based on begin and end range
// pointers, with grouping disabled and case insensitivity enabled.
//
// using namespace clr::regex;
// LPCSTR input = "123Simmons456";
// if (STRRegEx::Matches("Sim+on", input+3, input+10, STRRegEx::MF_CASE_INSENSITIVE))
// printf("Match succeeded");
// else
// printf("Match failed");
//
// This sample should result in "Match succeeded" being printed.
class STRRegEx : public RegExBase<CHARItemTraits<LPCSTR> >
{
typedef RegExBase<CHARItemTraits<LPCSTR> > PARENT_TYPE;
public:
using PARENT_TYPE::Match;
using PARENT_TYPE::Matches;
static bool Match(
LPCSTR regex,
LPCSTR input,
GroupingContainer& groups,
MatchFlags flags = DefaultMatchFlags)
{
WRAPPER_NO_CONTRACT;
return Match(regex, regex + strlen(regex), input, input + strlen(input), groups, flags);
}
static bool Matches(
LPCSTR regex,
LPCSTR input,
MatchFlags flags = DefaultMatchFlags)
{
CONTRACTL {
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
} CONTRACTL_END;
return Matches(regex, regex + strlen(regex), input, input + strlen(input), flags);
}
};
} // namespace regex
} // namespace clr
#endif // _DEBUG
#endif // _REGEX_UTIL_H_
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