Initial commit of Hyperscan

2026-01-01 22:25:42 +03:00 · 2015-10-20 09:13:35 +11:00
commit 904e436f11
610 changed files with 213627 additions and 0 deletions
--- a/src/parser/ComponentSequence.h
+++ b/src/parser/ComponentSequence.h
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2015, 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 Sequence of Component objects.
+ */
+
+#ifndef COMPONENT_SEQUENCE_H
+#define COMPONENT_SEQUENCE_H
+
+#include "Component.h"
+#include "ComponentRepeat.h" // for ComponentRepeat::RepeatType
+#include "ue2common.h"
+
+#include <memory>
+#include <set>
+#include <vector>
+
+namespace ue2 {
+
+class ComponentAlternation;
+class GlushkovBuildState;
+
+// Encapsulates a number of sub expressions to be applied sequentially
+class ComponentSequence : public Component {
+    friend class DumpVisitor;
+    friend class PrintVisitor;
+    friend class SimplifyVisitor;
+public:
+    /** \brief capture index representing a sequence that ISN'T capturing */
+    static constexpr unsigned int NOT_CAPTURED = 65536;
+
+    ComponentSequence();
+    ~ComponentSequence() override;
+    ComponentSequence *clone() const override;
+    Component *accept(ComponentVisitor &v) override;
+    void accept(ConstComponentVisitor &v) const override;
+
+    bool addRepeat(u32 min, u32 max, ComponentRepeat::RepeatType type);
+
+    // overridden by ComponentCondReference, which can only have 1 or 2
+    // branches.
+    virtual void addAlternation();
+
+    virtual void finalize();
+
+    void addComponent(std::unique_ptr<Component> comp);
+
+    std::vector<PositionInfo> first() const override;
+    std::vector<PositionInfo> last() const override;
+    bool empty(void) const override;
+    bool vacuous_everywhere() const override;
+    void notePositions(GlushkovBuildState &bs) override;
+    void buildFollowSet(GlushkovBuildState &bs,
+                        const std::vector<PositionInfo> &lastPos) override;
+    bool checkEmbeddedStartAnchor(bool at_start) const override;
+    bool checkEmbeddedEndAnchor(bool at_end) const override;
+
+    void optimise(bool connected_to_sds) override;
+
+    void setCaptureIndex(unsigned int idx) { capture_index = idx; }
+    unsigned int getCaptureIndex() const { return capture_index; }
+    void setCaptureName(const std::string &s) { capture_name = s; }
+    const std::string &getCaptureName() const { return capture_name; }
+
+    virtual const std::vector<std::unique_ptr<Component>> &getChildren() const {
+        return children;
+    }
+
+protected:
+    ComponentSequence(const ComponentSequence &other);
+
+    std::vector<std::unique_ptr<Component>> children;
+    std::unique_ptr<ComponentAlternation> alternation;
+
+private:
+    unsigned int capture_index;
+    std::string capture_name; //!< empty means no name
+};
+
+} // namespace ue2
+
+#endif