JavaScriptCore-1097.3.tar.gz

[apple/javascriptcore.git] / runtime / MatchResult.h

diff --git a/runtime/MatchResult.h b/runtime/MatchResult.h
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+/*
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 MatchResult_h
+#define MatchResult_h
+
+typedef uint64_t EncodedMatchResult;
+
+struct MatchResult {
+    ALWAYS_INLINE MatchResult(size_t start, size_t end)
+        : start(start)
+        , end(end)
+    {
+    }
+
+    explicit ALWAYS_INLINE MatchResult(EncodedMatchResult encoded)
+    {
+        union u {
+            uint64_t encoded;
+            struct s {
+                size_t start;
+                size_t end;
+            } split;
+        } value;
+        value.encoded = encoded;
+        start = value.split.start;
+        end = value.split.end;
+    }
+
+    ALWAYS_INLINE static MatchResult failed()
+    {
+        return MatchResult(WTF::notFound, 0);
+    }
+
+    ALWAYS_INLINE operator bool()
+    {
+        return start != WTF::notFound;
+    }
+
+    ALWAYS_INLINE bool empty()
+    {
+        return start == end;
+    }
+
+    size_t start;
+    size_t end;
+};
+
+#endif