light C++ wrapper for pcre16 library

1 files changed, 108 insertions, 0 deletions

diff --git a/include/m_regexp.h b/include/m_regexp.h
new file mode 100644
index 0000000000..e34d956474
--- /dev/null
+++ b/include/m_regexp.h
@@ -0,0 +1,108 @@
+/*
+
+Miranda NG: the free IM client for Microsoft* Windows*
+
+Copyright (c) 2012-17 Miranda NG project (https://miranda-ng.org)
+Copyright (c) 2000-08 Miranda ICQ/IM project,
+all portions of this codebase are copyrighted to the people
+listed in contributors.txt.
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+*/
+
+#ifndef MIM_REGEXP_H
+#define MIM_REGEXP_H
+
+#include "../libs/pcre16/src/pcre.h"
+
+class MRegexp16
+{
+	pcre16 *m_pattern = nullptr;
+	pcre16_extra *m_extra = nullptr;
+	bool m_bIsValid = false;
+	const wchar_t *m_prevText;
+	int m_nMatches = 0, m_start = 0;
+	int m_offsets[100];
+
+	MRegexp16(const MRegexp16&); // never applied
+
+public:
+	MRegexp16()
+	{}
+
+	MRegexp16(const wchar_t *pwszPattern)
+	{
+		compile(pwszPattern);
+	}
+
+	void compile(const wchar_t *pwszPattern)
+	{
+		m_bIsValid = false;
+
+		int erroffset;
+		const char *err;
+		m_pattern = ::pcre16_compile(pwszPattern, 0, &err, &erroffset, nullptr);
+		if (m_pattern == nullptr)
+			return;
+
+		m_extra = ::pcre16_study(m_pattern, 0, &err);
+		if (m_extra == nullptr)
+			return;
+
+		m_bIsValid = true;
+	}
+
+	~MRegexp16()
+	{
+		if (m_pattern) ::pcre16_free(m_pattern);
+		if (m_extra) ::pcre16_free(m_extra);
+	}
+
+	__forceinline bool isValid() const { return m_bIsValid; }
+	__forceinline int  numMatches() const { return m_nMatches; }
+
+	int getPos() const
+	{
+		return (m_nMatches >= 0) ? m_offsets[0] : 0;
+	}
+
+	CMStringW getMatch()
+	{
+		return CMStringW(m_prevText + m_offsets[0], m_offsets[1] - m_offsets[0]);
+	}
+
+	CMStringW getGroup(int i)
+	{
+		if (i >= m_nMatches)
+			return L"";
+
+		return CMStringW(m_prevText + m_offsets[i*2], m_offsets[i*2 + 1] - m_offsets[i*2]);
+	}
+
+	int match(const wchar_t *pwszText)
+	{
+		return m_nMatches = ::pcre16_exec(m_pattern, m_extra, m_prevText = pwszText, (int)mir_wstrlen(pwszText), 0, 0, m_offsets, _countof(m_offsets));
+	}
+
+	int nextMatch(const wchar_t *pwszText)
+	{
+		m_nMatches = ::pcre16_exec(m_pattern, m_extra, m_prevText = pwszText, (int)mir_wstrlen(pwszText), m_start, 0, m_offsets, _countof(m_offsets));
+		m_start = (m_nMatches >= 0) ? m_offsets[1] : 0;
+
+		return m_nMatches;
+	}
+};
+
+#endif // MIM_REGEXP_H