Character classes

src/jsregexp-inl.h

+// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// 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 Google Inc. 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 V8_JSREGEXP_INL_H_
+#define V8_JSREGEXP_INL_H_
+
+
+#include "jsregexp.h"
+
+
+namespace v8 {
+namespace internal {
+
+
+CharacterClass CharacterClass::SingletonField(uc16 value) {
+  CharacterClass result(FIELD);
+  result.segment_ = segment_of(value);
+  result.data_.u_field = long_bit(value & kSegmentMask);
+  return result;
+}
+
+
+CharacterClass CharacterClass::RangeField(Range range) {
+  CharacterClass result;
+  result.InitializeFieldFrom(Vector<Range>(&range, 1));
+  return result;
+}
+
+
+CharacterClass CharacterClass::Union(CharacterClass* left,
+                                     CharacterClass* right) {
+  CharacterClass result(UNION);
+  result.data_.u_union.left = left;
+  result.data_.u_union.right = right;
+  return result;
+}
+
+
+void CharacterClass::write_nibble(int index, byte value) {
+  ASSERT(0 <= index && index < 16);
+  data_.u_field |= static_cast<uint64_t>(value) << (4 * index);
+}
+
+
+byte CharacterClass::read_nibble(int index) {
+  ASSERT(0 <= index && index < 16);
+  return (data_.u_field >> (4 * index)) & 0xf;
+}
+
+
+unsigned CharacterClass::segment_of(uc16 value) {
+  return value >> CharacterClass::kFieldSegmentWidth;
+}
+
+
+uc16 CharacterClass::segment_start(unsigned segment) {
+  return segment << CharacterClass::kFieldSegmentWidth;
+}
+
+
+
+}  // namespace internal
+}  // namespace v8
+
+
+#endif  // V8_JSREGEXP_INL_H_