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