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/*
* Copyright (c) 2015-2016, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/** \file
* \brief Checks component trees for unsupported components.
*/
#include "ConstComponentVisitor.h"
#include "ComponentEUS.h"
#include "ComponentRepeat.h"
#include "ComponentWordBoundary.h"
#include "parse_error.h"
#include "unsupported.h"
#include <sstream>
namespace ue2 {
/** \brief Visitor class that throws a ParseError exception when it encounters
* an unsupported component. */
class UnsupportedVisitor : public DefaultConstComponentVisitor {
public:
~UnsupportedVisitor() override;
using DefaultConstComponentVisitor::pre;
void pre(const ComponentAssertion &) override {
throw ParseError("Zero-width assertions are not supported.");
}
void pre(const ComponentAtomicGroup &) override {
throw ParseError("Atomic groups are unsupported.");
}
void pre(const ComponentBackReference &) override {
throw ParseError("Back-references are unsupported.");
}
void pre(const ComponentCondReference &) override {
throw ParseError("Conditional references are not supported.");
}
void pre(const ComponentEUS &c) override {
std::ostringstream str;
str << "\\X unsupported at index " << c.loc << ".";
throw ParseError(str.str());
}
void pre(const ComponentRepeat &c) override {
if (c.type == ComponentRepeat::REPEAT_POSSESSIVE) {
throw ParseError("Possessive quantifiers are not supported.");
}
}
void pre(const ComponentWordBoundary &c) override {
if (c.ucp && !c.prefilter) {
std::ostringstream str;
str << (!c.negated ? "\\b" : "\\B")
<< " unsupported in UCP mode at index " << c.loc << ".";
throw ParseError(str.str());
}
}
};
UnsupportedVisitor::~UnsupportedVisitor() {}
void checkUnsupported(const Component &root) {
UnsupportedVisitor vis;
root.accept(vis);
}
} // namespace ue2
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