runtime/RegExpCachedResult.cpp

   1 /*
   2  * Copyright (C) 2012 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "RegExpCachedResult.h"
  28
  29 #include "JSCInlines.h"
  30 #include "RegExpMatchesArray.h"
  31
  32 namespace JSC {
  33
  34 void RegExpCachedResult::visitChildren(SlotVisitor& visitor)
  35 {
  36     visitor.append(&m_lastInput);
  37     visitor.append(&m_lastRegExp);
  38     visitor.append(&m_reifiedInput);
  39     visitor.append(&m_reifiedResult);
  40     visitor.append(&m_reifiedLeftContext);
  41     visitor.append(&m_reifiedRightContext);
  42 }
  43
  44 JSArray* RegExpCachedResult::lastResult(ExecState* exec, JSObject* owner)
  45 {
  46     if (!m_reified) {
  47         m_reifiedInput.set(exec->vm(), owner, m_lastInput.get());
  48         m_reifiedResult.set(exec->vm(), owner, createRegExpMatchesArray(exec, m_lastInput.get(), m_lastRegExp.get(), m_result));
  49         m_reified = true;
  50     }
  51     return m_reifiedResult.get();
  52 }
  53
  54 JSString* RegExpCachedResult::leftContext(ExecState* exec, JSObject* owner)
  55 {
  56     // Make sure we're reified.
  57     lastResult(exec, owner);
  58     if (!m_reifiedLeftContext)
  59         m_reifiedLeftContext.set(exec->vm(), owner, m_result.start ? jsSubstring(exec, m_reifiedInput.get(), 0, m_result.start) : jsEmptyString(exec));
  60     return m_reifiedLeftContext.get();
  61 }
  62
  63 JSString* RegExpCachedResult::rightContext(ExecState* exec, JSObject* owner)
  64 {
  65     // Make sure we're reified.
  66     lastResult(exec, owner);
  67     if (!m_reifiedRightContext) {
  68         unsigned length = m_reifiedInput->length();
  69         m_reifiedRightContext.set(exec->vm(), owner, m_result.end != length ? jsSubstring(exec, m_reifiedInput.get(), m_result.end, length - m_result.end) : jsEmptyString(exec));
  70     }
  71     return m_reifiedRightContext.get();
  72 }
  73
  74 void RegExpCachedResult::setInput(ExecState* exec, JSObject* owner, JSString* input)
  75 {
  76     // Make sure we're reified, otherwise m_reifiedInput will be ignored.
  77     lastResult(exec, owner);
  78     ASSERT(m_reified);
  79     m_reifiedInput.set(exec->vm(), owner, input);
  80 }
  81
  82 } // namespace JSC