runtime/RegExpMatchesArray.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 "RegExpMatchesArray.h"
  28
  29 namespace JSC {
  30
  31 ASSERT_CLASS_FITS_IN_CELL(RegExpMatchesArray);
  32
  33 const ClassInfo RegExpMatchesArray::s_info = {"Array", &JSArray::s_info, 0, 0, CREATE_METHOD_TABLE(RegExpMatchesArray)};
  34
  35 void RegExpMatchesArray::finishCreation(JSGlobalData& globalData)
  36 {
  37     Base::finishCreation(globalData, m_regExp->numSubpatterns() + 1);
  38 }
  39
  40 void RegExpMatchesArray::visitChildren(JSCell* cell, SlotVisitor& visitor)
  41 {
  42     RegExpMatchesArray* thisObject = jsCast<RegExpMatchesArray*>(cell);
  43     ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
  44     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
  45     ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
  46
  47     Base::visitChildren(thisObject, visitor);
  48     visitor.append(&thisObject->m_input);
  49     visitor.append(&thisObject->m_regExp);
  50 }
  51
  52 void RegExpMatchesArray::reifyAllProperties(ExecState* exec)
  53 {
  54     ASSERT(m_state != ReifiedAll);
  55     ASSERT(m_result);
  56
  57     reifyMatchPropertyIfNecessary(exec);
  58
  59     if (unsigned numSubpatterns = m_regExp->numSubpatterns()) {
  60         Vector<int, 32> subpatternResults;
  61         int position = m_regExp->match(exec->globalData(), m_input->value(exec), m_result.start, subpatternResults);
  62         ASSERT_UNUSED(position, position >= 0 && static_cast<size_t>(position) == m_result.start);
  63         ASSERT(m_result.start == static_cast<size_t>(subpatternResults[0]));
  64         ASSERT(m_result.end == static_cast<size_t>(subpatternResults[1]));
  65
  66         for (unsigned i = 1; i <= numSubpatterns; ++i) {
  67             int start = subpatternResults[2 * i];
  68             if (start >= 0)
  69                 putDirectIndex(exec, i, jsSubstring(exec, m_input.get(), start, subpatternResults[2 * i + 1] - start), false);
  70             else
  71                 putDirectIndex(exec, i, jsUndefined(), false);
  72         }
  73     }
  74
  75     PutPropertySlot slot;
  76     JSArray::put(this, exec, exec->propertyNames().index, jsNumber(m_result.start), slot);
  77     JSArray::put(this, exec, exec->propertyNames().input, m_input.get(), slot);
  78
  79     m_state = ReifiedAll;
  80 }
  81
  82 void RegExpMatchesArray::reifyMatchProperty(ExecState* exec)
  83 {
  84     ASSERT(m_state == ReifiedNone);
  85     ASSERT(m_result);
  86     putDirectIndex(exec, 0, jsSubstring(exec, m_input.get(), m_result.start, m_result.end - m_result.start), false);
  87     m_state = ReifiedMatch;
  88 }
  89
  90 JSString* RegExpMatchesArray::leftContext(ExecState* exec)
  91 {
  92     if (!m_result.start)
  93         return jsEmptyString(exec);
  94     return jsSubstring(exec, m_input.get(), 0, m_result.start);
  95 }
  96
  97 JSString* RegExpMatchesArray::rightContext(ExecState* exec)
  98 {
  99     unsigned length = m_input->length();
 100     if (m_result.end == length)
 101         return jsEmptyString(exec);
 102     return jsSubstring(exec, m_input.get(), m_result.end, length - m_result.end);
 103 }
 104
 105 } // namespace JSC