1/*
2 * Copyright (C) 2010 Alex Milowski (alex@milowski.com). All rights reserved.
3 * Copyright (C) 2013 The MathJax Consortium.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef RenderMathMLScripts_h
28#define RenderMathMLScripts_h
29
30#if ENABLE(MATHML)
31
32#include "RenderMathMLBlock.h"
33
34namespace WebCore {
35
36class RenderMathMLScripts;
37
38class RenderMathMLScriptsWrapper : public RenderMathMLBlock {
39
40friend class RenderMathMLScripts;
41
42public:
43    enum WrapperType { Base, SubSupPair };
44
45    virtual void addChild(RenderObject* child, RenderObject* beforeChild = 0) override;
46    virtual RenderObject* removeChild(RenderObject&) override;
47
48private:
49    RenderMathMLScriptsWrapper(Document& document, PassRef<RenderStyle> style, WrapperType kind)
50        : RenderMathMLBlock(document, WTF::move(style))
51        , m_kind(kind)
52    {
53    }
54
55    static RenderMathMLScriptsWrapper* createAnonymousWrapper(RenderMathMLScripts* renderObject, WrapperType);
56
57    void addChildInternal(bool normalInsertion, RenderObject* child, RenderObject* beforeChild = 0);
58    RenderObject* removeChildInternal(bool normalRemoval, RenderObject& child);
59
60    virtual const char* renderName() const override { return m_kind == Base ? "Base Wrapper" : "SubSupPair Wrapper"; }
61    virtual bool isRenderMathMLScriptsWrapper() const override final { return true; }
62
63    RenderMathMLScripts* parentMathMLScripts();
64
65    WrapperType m_kind;
66};
67
68RENDER_OBJECT_TYPE_CASTS(RenderMathMLScriptsWrapper, isRenderMathMLScriptsWrapper())
69
70// Render a base with scripts.
71class RenderMathMLScripts : public RenderMathMLBlock {
72
73friend class RenderMathMLScriptsWrapper;
74
75public:
76    RenderMathMLScripts(Element&, PassRef<RenderStyle>);
77    virtual void addChild(RenderObject* child, RenderObject* beforeChild = 0) override;
78    virtual RenderObject* removeChild(RenderObject&) override;
79
80    virtual RenderMathMLOperator* unembellishedOperator();
81    virtual int firstLineBaseline() const override;
82
83protected:
84    virtual void layout();
85
86private:
87    void addChildInternal(bool normalInsertion, RenderObject* child, RenderObject* beforeChild = 0);
88    RenderObject* removeChildInternal(bool normalRemoval, RenderObject& child);
89
90    virtual bool isRenderMathMLScripts() const override final { return true; }
91    virtual const char* renderName() const override { return "RenderMathMLScripts"; }
92
93    void fixAnonymousStyleForSubSupPair(RenderObject* subSupPair, bool isPostScript);
94    void fixAnonymousStyles();
95
96    virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) override;
97
98    // Omit our subscript and/or superscript. This may return 0 for a non-MathML base (which
99    // won't occur in valid MathML).
100    RenderBoxModelObject* base() const;
101
102    enum ScriptsType { Sub, Super, SubSup, Multiscripts };
103
104    ScriptsType m_kind;
105    RenderMathMLScriptsWrapper* m_baseWrapper;
106};
107
108RENDER_OBJECT_TYPE_CASTS(RenderMathMLScripts, isRenderMathMLScripts())
109
110}
111
112#endif // ENABLE(MATHML)
113
114#endif // RenderMathMLScripts_h
115