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-rw-r--r--ucb/source/regexp/regexp.cxx394
1 files changed, 394 insertions, 0 deletions
diff --git a/ucb/source/regexp/regexp.cxx b/ucb/source/regexp/regexp.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <regexp.hxx>
+
+#include <cstddef>
+
+#include <osl/diagnose.h>
+#include <com/sun/star/lang/IllegalArgumentException.hpp>
+#include <rtl/character.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <rtl/ustring.hxx>
+
+using namespace com::sun::star;
+using namespace ucb_impl;
+
+
+// Regexp
+
+
+inline Regexp::Regexp(Kind eTheKind, OUString const & rThePrefix,
+ bool bTheEmptyDomain, OUString const & rTheInfix,
+ bool bTheTranslation,
+ OUString const & rTheReversePrefix):
+ m_eKind(eTheKind),
+ m_aPrefix(rThePrefix),
+ m_aInfix(rTheInfix),
+ m_aReversePrefix(rTheReversePrefix),
+ m_bEmptyDomain(bTheEmptyDomain),
+ m_bTranslation(bTheTranslation)
+{
+ OSL_ASSERT(m_eKind == KIND_DOMAIN
+ || (!m_bEmptyDomain && m_aInfix.isEmpty()));
+ OSL_ASSERT(m_bTranslation || m_aReversePrefix.isEmpty());
+}
+
+
+namespace {
+
+bool matchStringIgnoreCase(sal_Unicode const ** pBegin,
+ sal_Unicode const * pEnd,
+ OUString const & rString)
+{
+ sal_Unicode const * p = *pBegin;
+
+ sal_Unicode const * q = rString.getStr();
+ sal_Unicode const * qEnd = q + rString.getLength();
+
+ if (pEnd - p < qEnd - q)
+ return false;
+
+ while (q != qEnd)
+ {
+ if (rtl::compareIgnoreAsciiCase(*p++, *q++) != 0)
+ return false;
+ }
+
+ *pBegin = p;
+ return true;
+}
+
+}
+
+bool Regexp::matches(OUString const & rString) const
+{
+ sal_Unicode const * pBegin = rString.getStr();
+ sal_Unicode const * pEnd = pBegin + rString.getLength();
+
+ bool bMatches = false;
+
+ sal_Unicode const * p = pBegin;
+ if (matchStringIgnoreCase(&p, pEnd, m_aPrefix))
+ {
+ switch (m_eKind)
+ {
+ case KIND_PREFIX:
+ bMatches = true;
+ break;
+
+ case KIND_AUTHORITY:
+ bMatches = p == pEnd || *p == '/' || *p == '?' || *p == '#';
+ break;
+
+ case KIND_DOMAIN:
+ if (!m_bEmptyDomain)
+ {
+ if (p == pEnd || *p == '/' || *p == '?' || *p == '#')
+ break;
+ ++p;
+ }
+ for (;;)
+ {
+ sal_Unicode const * q = p;
+ if (matchStringIgnoreCase(&q, pEnd, m_aInfix)
+ && (q == pEnd || *q == '/' || *q == '?' || *q == '#'))
+ {
+ bMatches = true;
+ break;
+ }
+
+ if (p == pEnd)
+ break;
+
+ sal_Unicode c = *p++;
+ if (c == '/' || c == '?' || c == '#')
+ break;
+ }
+ break;
+ }
+ }
+
+ return bMatches;
+}
+
+
+namespace {
+
+bool isScheme(OUString const & rString, bool bColon)
+{
+ // Return true if rString matches <scheme> (plus a trailing ":" if bColon
+ // is true) from RFC 2396:
+ sal_Unicode const * p = rString.getStr();
+ sal_Unicode const * pEnd = p + rString.getLength();
+ if (p != pEnd && rtl::isAsciiAlpha(*p))
+ for (++p;;)
+ {
+ if (p == pEnd)
+ return !bColon;
+ sal_Unicode c = *p++;
+ if (!(rtl::isAsciiAlphanumeric(c)
+ || c == '+' || c == '-' || c == '.'))
+ return bColon && c == ':' && p == pEnd;
+ }
+ return false;
+}
+
+void appendStringLiteral(OUStringBuffer * pBuffer,
+ OUString const & rString)
+{
+ OSL_ASSERT(pBuffer);
+
+ pBuffer->append('"');
+ sal_Unicode const * p = rString.getStr();
+ sal_Unicode const * pEnd = p + rString.getLength();
+ while (p != pEnd)
+ {
+ sal_Unicode c = *p++;
+ if (c == '"' || c == '\\')
+ pBuffer->append('\\');
+ pBuffer->append(c);
+ }
+ pBuffer->append('"');
+}
+
+}
+
+OUString Regexp::getRegexp() const
+{
+ if (m_bTranslation)
+ {
+ OUStringBuffer aBuffer;
+ if (!m_aPrefix.isEmpty())
+ appendStringLiteral(&aBuffer, m_aPrefix);
+ switch (m_eKind)
+ {
+ case KIND_PREFIX:
+ aBuffer.append("(.*)");
+ break;
+
+ case KIND_AUTHORITY:
+ aBuffer.append("(([/?#].*)?)");
+ break;
+
+ case KIND_DOMAIN:
+ aBuffer.append("([^/?#]");
+ aBuffer.append(sal_Unicode(m_bEmptyDomain ? '*' : '+'));
+ if (!m_aInfix.isEmpty())
+ appendStringLiteral(&aBuffer, m_aInfix);
+ aBuffer.append("([/?#].*)?)");
+ break;
+ }
+ aBuffer.append("->");
+ if (!m_aReversePrefix.isEmpty())
+ appendStringLiteral(&aBuffer, m_aReversePrefix);
+ aBuffer.append("\\1");
+ return aBuffer.makeStringAndClear();
+ }
+ else if (m_eKind == KIND_PREFIX && isScheme(m_aPrefix, true))
+ return m_aPrefix.copy(0, m_aPrefix.getLength() - 1);
+ else
+ {
+ OUStringBuffer aBuffer;
+ if (!m_aPrefix.isEmpty())
+ appendStringLiteral(&aBuffer, m_aPrefix);
+ switch (m_eKind)
+ {
+ case KIND_PREFIX:
+ aBuffer.append(".*");
+ break;
+
+ case KIND_AUTHORITY:
+ aBuffer.append("([/?#].*)?");
+ break;
+
+ case KIND_DOMAIN:
+ aBuffer.append("[^/?#]");
+ aBuffer.append( m_bEmptyDomain ? '*' : '+' );
+ if (!m_aInfix.isEmpty())
+ appendStringLiteral(&aBuffer, m_aInfix);
+ aBuffer.append("([/?#].*)?");
+ break;
+ }
+ return aBuffer.makeStringAndClear();
+ }
+}
+
+
+namespace {
+
+bool matchString(sal_Unicode const ** pBegin, sal_Unicode const * pEnd,
+ char const * pString, size_t nStringLength)
+{
+ sal_Unicode const * p = *pBegin;
+
+ unsigned char const * q = reinterpret_cast< unsigned char const * >(pString);
+ unsigned char const * qEnd = q + nStringLength;
+
+ if (pEnd - p < qEnd - q)
+ return false;
+
+ while (q != qEnd)
+ {
+ sal_Unicode c1 = *p++;
+ sal_Unicode c2 = *q++;
+ if (c1 != c2)
+ return false;
+ }
+
+ *pBegin = p;
+ return true;
+}
+
+bool scanStringLiteral(sal_Unicode const ** pBegin, sal_Unicode const * pEnd,
+ OUString * pString)
+{
+ sal_Unicode const * p = *pBegin;
+
+ if (p == pEnd || *p++ != '"')
+ return false;
+
+ OUStringBuffer aBuffer;
+ for (;;)
+ {
+ if (p == pEnd)
+ return false;
+ sal_Unicode c = *p++;
+ if (c == '"')
+ break;
+ if (c == '\\')
+ {
+ if (p == pEnd)
+ return false;
+ c = *p++;
+ if (c != '"' && c != '\\')
+ return false;
+ }
+ aBuffer.append(c);
+ }
+
+ *pBegin = p;
+ *pString = aBuffer.makeStringAndClear();
+ return true;
+}
+
+}
+
+Regexp Regexp::parse(OUString const & rRegexp)
+{
+ // Detect an input of '<scheme>' as an abbreviation of '"<scheme>:".*'
+ // where <scheme> is as defined in RFC 2396:
+ if (isScheme(rRegexp, false))
+ return Regexp(Regexp::KIND_PREFIX,
+ rRegexp + ":",
+ false,
+ OUString(),
+ false,
+ OUString());
+
+ sal_Unicode const * p = rRegexp.getStr();
+ sal_Unicode const * pEnd = p + rRegexp.getLength();
+
+ OUString aPrefix;
+ scanStringLiteral(&p, pEnd, &aPrefix);
+
+ if (p == pEnd)
+ throw lang::IllegalArgumentException();
+
+ // This and the matchString() calls below are some of the few places where
+ // RTL_CONSTASCII_STRINGPARAM() should NOT be removed.
+ // (c.f. https://gerrit.libreoffice.org/3117)
+ if (matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM(".*")))
+ {
+ if (p != pEnd)
+ throw lang::IllegalArgumentException();
+
+ return Regexp(Regexp::KIND_PREFIX, aPrefix, false, OUString(),
+ false, OUString());
+ }
+ else if (matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM("(.*)->")))
+ {
+ OUString aReversePrefix;
+ scanStringLiteral(&p, pEnd, &aReversePrefix);
+
+ if (!matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM("\\1"))
+ || p != pEnd)
+ throw lang::IllegalArgumentException();
+
+ return Regexp(Regexp::KIND_PREFIX, aPrefix, false, OUString(),
+ true, aReversePrefix);
+ }
+ else if (matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM("([/?#].*)?")))
+ {
+ if (p != pEnd)
+ throw lang::IllegalArgumentException();
+
+ return Regexp(Regexp::KIND_AUTHORITY, aPrefix, false, OUString(),
+ false, OUString());
+ }
+ else if (matchString(&p, pEnd,
+ RTL_CONSTASCII_STRINGPARAM("(([/?#].*)?)->")))
+ {
+ OUString aReversePrefix;
+ if (!(scanStringLiteral(&p, pEnd, &aReversePrefix)
+ && matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM("\\1"))
+ && p == pEnd))
+ throw lang::IllegalArgumentException();
+
+ return Regexp(Regexp::KIND_AUTHORITY, aPrefix, false, OUString(),
+ true, aReversePrefix);
+ }
+ else
+ {
+ bool bOpen = false;
+ if (p != pEnd && *p == '(')
+ {
+ ++p;
+ bOpen = true;
+ }
+
+ if (!matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM("[^/?#]")))
+ throw lang::IllegalArgumentException();
+
+ if (p == pEnd || (*p != '*' && *p != '+'))
+ throw lang::IllegalArgumentException();
+ bool bEmptyDomain = *p++ == '*';
+
+ OUString aInfix;
+ scanStringLiteral(&p, pEnd, &aInfix);
+
+ if (!matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM("([/?#].*)?")))
+ throw lang::IllegalArgumentException();
+
+ OUString aReversePrefix;
+ if (bOpen
+ && !(matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM(")->"))
+ && scanStringLiteral(&p, pEnd, &aReversePrefix)
+ && matchString(&p, pEnd, RTL_CONSTASCII_STRINGPARAM("\\1"))))
+ throw lang::IllegalArgumentException();
+
+ if (p != pEnd)
+ throw lang::IllegalArgumentException();
+
+ return Regexp(Regexp::KIND_DOMAIN, aPrefix, bEmptyDomain, aInfix,
+ bOpen, aReversePrefix);
+ }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */