Initial commit of Hyperscan

src/util/unicode_set.h

@@ -0,0 +1,141 @@
+/*
+ * 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.
+ */
+
+#ifndef UNICODE_SET
+#define UNICODE_SET
+
+#include "unicode_def.h"
+
+#include <boost/icl/interval_set.hpp>
+
+namespace ue2 {
+
+class CodePointSet {
+public:
+    typedef boost::icl::closed_interval<unichar> interval;
+    typedef boost::icl::interval_set<unichar, std::less, interval> implT;
+    typedef implT::const_iterator const_iterator;
+
+    CodePointSet(void) {}
+
+    explicit CodePointSet(const interval &st) : impl(st) {}
+
+    bool none(void) const {
+        return impl.empty();
+    }
+
+    void set(unichar c) {
+        assert(c <= MAX_UNICODE);
+        impl.insert(c);
+    }
+
+    void unset(unichar c) {
+        assert(c <= MAX_UNICODE);
+        impl.subtract(c);
+    }
+
+    void setRange(unichar from, unichar to) { /* inclusive */
+        assert(from <= to);
+        assert(to <= MAX_UNICODE);
+        impl.insert(interval(from, to));
+    }
+
+    void unsetRange(unichar from, unichar to) { /* inclusive */
+        assert(from <= to);
+        assert(to <= MAX_UNICODE);
+        impl.subtract(interval(from, to));
+    }
+
+    void flip(void) {
+        impl = implT(interval(0, MAX_UNICODE)) - impl;
+    }
+
+    void operator|=(const CodePointSet &a) {
+        impl += a.impl;
+    }
+
+    const_iterator begin(void) const {
+        return impl.begin();
+    }
+
+    const_iterator end(void) const {
+        return impl.end();
+    }
+
+    size_t count(void) const {
+        return cardinality(impl);
+    }
+
+    CodePointSet operator~(void) const {
+        CodePointSet rv = *this;
+        rv.flip();
+        return rv;
+    }
+
+    bool operator==(const CodePointSet &a) const {
+        return is_element_equal(impl, a.impl);
+    }
+
+    bool operator!=(const CodePointSet &a) const {
+        return !is_element_equal(impl, a.impl);
+    }
+
+    bool isSubset(const CodePointSet &a) const {
+        // Check that adding an interval set has no effect
+        return ((impl + a.impl) == impl);
+    }
+
+    void operator-=(const CodePointSet &a) {
+        impl -= a.impl;
+    }
+
+    /* finds the nth set codepoint, returns INVALID_UNICODE on failure */
+    unichar at(size_t pos) const {
+        for (const_iterator i = begin(), e = end(); i != e; ++i) {
+            size_t int_count = cardinality(*i);
+            if (int_count <= pos) {
+                /* not in this interval, check next */
+                pos -= int_count;
+                continue;
+            } else {
+                return lower(*i) + pos;
+            }
+        }
+
+        return INVALID_UNICODE;
+    }
+
+    void swap(CodePointSet &other) { impl.swap(other.impl); }
+
+private:
+    implT impl;
+};
+
+} // namespace ue2
+
+#endif