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      1 /*
      2  * Copyright (C) 2014 Google 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 are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef HTMLImportState_h
     32 #define HTMLImportState_h
     33 
     34 #include "wtf/Assertions.h"
     35 
     36 namespace blink {
     37 
     38 class HTMLImportState {
     39 public:
     40     enum Value {
     41         BlockingScriptExecution = 0,
     42         Active,
     43         Ready,
     44         Invalid
     45     };
     46 
     47     explicit HTMLImportState(Value value = BlockingScriptExecution)
     48         : m_value(value)
     49     { }
     50 
     51     bool shouldBlockScriptExecution() const { return checkedValue() <= BlockingScriptExecution; }
     52     bool isReady() const { return checkedValue() == Ready; }
     53     bool isValid() const { return m_value != Invalid; }
     54     bool operator==(const HTMLImportState& other) const { return m_value == other.m_value; }
     55     bool operator!=(const HTMLImportState& other) const { return !(*this == other); }
     56     bool operator<=(const HTMLImportState& other) const { return m_value <= other.m_value; }
     57 
     58 #if !defined(NDEBUG)
     59     Value peekValueForDebug() const { return m_value; }
     60 #endif
     61 
     62     static HTMLImportState invalidState() { return HTMLImportState(Invalid); }
     63     static HTMLImportState blockedState() { return HTMLImportState(BlockingScriptExecution); }
     64 private:
     65     Value checkedValue() const;
     66     Value m_value;
     67 };
     68 
     69 inline HTMLImportState::Value HTMLImportState::checkedValue() const
     70 {
     71     ASSERT(isValid());
     72     return m_value;
     73 }
     74 
     75 }
     76 
     77 #endif
     78