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comparison: layout/mathml/nsMathMLsemanticsFrame.cpp
layout/mathml/nsMathMLsemanticsFrame.cpp
- changeset 2
- 7e26c7da4463
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 | |
| 7 #include "nsMathMLsemanticsFrame.h" | |
| 8 #include "nsMimeTypes.h" | |
| 9 #include "mozilla/gfx/2D.h" | |
| 10 | |
| 11 // | |
| 12 // <semantics> -- associate annotations with a MathML expression | |
| 13 // | |
| 14 | |
| 15 nsIFrame* | |
| 16 NS_NewMathMLsemanticsFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) | |
| 17 { | |
| 18 return new (aPresShell) nsMathMLsemanticsFrame(aContext); | |
| 19 } | |
| 20 | |
| 21 NS_IMPL_FRAMEARENA_HELPERS(nsMathMLsemanticsFrame) | |
| 22 | |
| 23 nsMathMLsemanticsFrame::~nsMathMLsemanticsFrame() | |
| 24 { | |
| 25 } | |
| 26 | |
| 27 nsIFrame* | |
| 28 nsMathMLsemanticsFrame::GetSelectedFrame() | |
| 29 { | |
| 30 // By default, we will display the first child of the <semantics> element. | |
| 31 nsIFrame* childFrame = mFrames.FirstChild(); | |
| 32 mSelectedFrame = childFrame; | |
| 33 | |
| 34 // An empty <semantics> is invalid | |
| 35 if (!childFrame) { | |
| 36 mInvalidMarkup = true; | |
| 37 return mSelectedFrame; | |
| 38 } | |
| 39 mInvalidMarkup = false; | |
| 40 | |
| 41 // Using <annotation> or <annotation-xml> as a first child is invalid. | |
| 42 // However some people use this syntax so we take care of this case too. | |
| 43 bool firstChildIsAnnotation = false; | |
| 44 nsIContent* childContent = childFrame->GetContent(); | |
| 45 if (childContent->GetNameSpaceID() == kNameSpaceID_MathML && | |
| 46 (childContent->Tag() == nsGkAtoms::annotation_ || | |
| 47 childContent->Tag() == nsGkAtoms::annotation_xml_)) { | |
| 48 firstChildIsAnnotation = true; | |
| 49 } | |
| 50 | |
| 51 // If the first child is a presentation MathML element other than | |
| 52 // <annotation> or <annotation-xml>, we are done. | |
| 53 if (!firstChildIsAnnotation && | |
| 54 childFrame->IsFrameOfType(nsIFrame::eMathML)) { | |
| 55 nsIMathMLFrame* mathMLFrame = do_QueryFrame(childFrame); | |
| 56 if (mathMLFrame) { | |
| 57 TransmitAutomaticData(); | |
| 58 return mSelectedFrame; | |
| 59 } | |
| 60 // The first child is not an annotation, so skip it. | |
| 61 childFrame = childFrame->GetNextSibling(); | |
| 62 } | |
| 63 | |
| 64 // Otherwise, we read the list of annotations and select the first one that | |
| 65 // could be displayed in place of the first child of <semantics>. If none is | |
| 66 // found, we fallback to this first child. | |
| 67 for ( ; childFrame; childFrame = childFrame->GetNextSibling()) { | |
| 68 nsIContent* childContent = childFrame->GetContent(); | |
| 69 | |
| 70 if (childContent->GetNameSpaceID() != kNameSpaceID_MathML) continue; | |
| 71 | |
| 72 if (childContent->Tag() == nsGkAtoms::annotation_) { | |
| 73 | |
| 74 // If the <annotation> element has an src attribute we ignore it. | |
| 75 // XXXfredw Should annotation images be supported? See the related | |
| 76 // bug 297465 for mglyph. | |
| 77 if (childContent->HasAttr(kNameSpaceID_None, nsGkAtoms::src)) continue; | |
| 78 | |
| 79 // Otherwise, we assume it is a text annotation that can always be | |
| 80 // displayed and stop here. | |
| 81 mSelectedFrame = childFrame; | |
| 82 break; | |
| 83 } | |
| 84 | |
| 85 if (childContent->Tag() == nsGkAtoms::annotation_xml_) { | |
| 86 | |
| 87 // If the <annotation-xml> element has an src attribute we ignore it. | |
| 88 if (childContent->HasAttr(kNameSpaceID_None, nsGkAtoms::src)) continue; | |
| 89 | |
| 90 // If the <annotation-xml> element has an encoding attribute | |
| 91 // describing presentation MathML, SVG or HTML we assume the content | |
| 92 // can be displayed and stop here. | |
| 93 // | |
| 94 // We recognize the following encoding values: | |
| 95 // | |
| 96 // - "MathML-Presentation", which is mentioned in the MathML3 REC | |
| 97 // - "SVG1.1" which is mentioned in the W3C note | |
| 98 // http://www.w3.org/Math/Documents/Notes/graphics.xml | |
| 99 // - Other mime Content-Types for SVG and HTML | |
| 100 // | |
| 101 // We exclude APPLICATION_MATHML_XML = "application/mathml+xml" which | |
| 102 // is ambiguous about whether it is Presentation or Content MathML. | |
| 103 // Authors must use a more explicit encoding value. | |
| 104 nsAutoString value; | |
| 105 childContent->GetAttr(kNameSpaceID_None, nsGkAtoms::encoding, value); | |
| 106 if (value.EqualsLiteral("application/mathml-presentation+xml") || | |
| 107 value.EqualsLiteral("MathML-Presentation") || | |
| 108 value.EqualsLiteral(IMAGE_SVG_XML) || | |
| 109 value.EqualsLiteral("SVG1.1") || | |
| 110 value.EqualsLiteral(APPLICATION_XHTML_XML) || | |
| 111 value.EqualsLiteral(TEXT_HTML)) { | |
| 112 mSelectedFrame = childFrame; | |
| 113 break; | |
| 114 } | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 TransmitAutomaticData(); | |
| 119 return mSelectedFrame; | |
| 120 } |
