| /* |
| * Copyright (C) 2016 Igalia S.L. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include "config.h" |
| #include "MathMLOperatorElement.h" |
| |
| #if ENABLE(MATHML) |
| |
| #include "RenderMathMLOperator.h" |
| #include <wtf/IsoMallocInlines.h> |
| #include <wtf/unicode/CharacterNames.h> |
| |
| namespace WebCore { |
| |
| WTF_MAKE_ISO_ALLOCATED_IMPL(MathMLOperatorElement); |
| |
| using namespace MathMLNames; |
| using namespace MathMLOperatorDictionary; |
| |
| MathMLOperatorElement::MathMLOperatorElement(const QualifiedName& tagName, Document& document) |
| : MathMLTokenElement(tagName, document) |
| { |
| } |
| |
| Ref<MathMLOperatorElement> MathMLOperatorElement::create(const QualifiedName& tagName, Document& document) |
| { |
| return adoptRef(*new MathMLOperatorElement(tagName, document)); |
| } |
| |
| MathMLOperatorElement::OperatorChar MathMLOperatorElement::parseOperatorChar(const String& string) |
| { |
| OperatorChar operatorChar; |
| // FIXME: This operator dictionary does not accept multiple characters (https://webkit.org/b/124828). |
| if (auto codePoint = convertToSingleCodePoint(string)) { |
| auto character = codePoint.value(); |
| // The minus sign renders better than the hyphen sign used in some MathML formulas. |
| if (character == hyphenMinus) |
| character = minusSign; |
| operatorChar.character = character; |
| operatorChar.isVertical = isVertical(operatorChar.character); |
| } |
| return operatorChar; |
| } |
| |
| const MathMLOperatorElement::OperatorChar& MathMLOperatorElement::operatorChar() |
| { |
| if (!m_operatorChar) |
| m_operatorChar = parseOperatorChar(textContent()); |
| return m_operatorChar.value(); |
| } |
| |
| Property MathMLOperatorElement::computeDictionaryProperty() |
| { |
| Property dictionaryProperty; |
| |
| // We first determine the form attribute and use the default spacing and properties. |
| const auto& value = attributeWithoutSynchronization(formAttr); |
| bool explicitForm = true; |
| if (value == "prefix") |
| dictionaryProperty.form = Prefix; |
| else if (value == "infix") |
| dictionaryProperty.form = Infix; |
| else if (value == "postfix") |
| dictionaryProperty.form = Postfix; |
| else { |
| // FIXME: We should use more advanced heuristics indicated in the specification to determine the operator form (https://bugs.webkit.org/show_bug.cgi?id=124829). |
| explicitForm = false; |
| if (!previousSibling() && nextSibling()) |
| dictionaryProperty.form = Prefix; |
| else if (previousSibling() && !nextSibling()) |
| dictionaryProperty.form = Postfix; |
| else |
| dictionaryProperty.form = Infix; |
| } |
| |
| // We then try and find an entry in the operator dictionary to override the default values. |
| if (auto entry = search(operatorChar().character, dictionaryProperty.form, explicitForm)) |
| dictionaryProperty = entry.value(); |
| |
| return dictionaryProperty; |
| } |
| |
| const Property& MathMLOperatorElement::dictionaryProperty() |
| { |
| if (!m_dictionaryProperty) |
| m_dictionaryProperty = computeDictionaryProperty(); |
| return m_dictionaryProperty.value(); |
| } |
| |
| static const QualifiedName& propertyFlagToAttributeName(MathMLOperatorDictionary::Flag flag) |
| { |
| switch (flag) { |
| case Accent: |
| return accentAttr; |
| case Fence: |
| return fenceAttr; |
| case LargeOp: |
| return largeopAttr; |
| case MovableLimits: |
| return movablelimitsAttr; |
| case Separator: |
| return separatorAttr; |
| case Stretchy: |
| return stretchyAttr; |
| case Symmetric: |
| return symmetricAttr; |
| } |
| ASSERT_NOT_REACHED(); |
| return nullQName(); |
| } |
| |
| void MathMLOperatorElement::computeOperatorFlag(MathMLOperatorDictionary::Flag flag) |
| { |
| ASSERT(m_properties.dirtyFlags & flag); |
| |
| Optional<BooleanValue> property; |
| const auto& name = propertyFlagToAttributeName(flag); |
| const BooleanValue& value = cachedBooleanAttribute(name, property); |
| switch (value) { |
| case BooleanValue::True: |
| m_properties.flags |= flag; |
| break; |
| case BooleanValue::False: |
| m_properties.flags &= ~flag; |
| break; |
| case BooleanValue::Default: |
| // By default, we use the value specified in the operator dictionary. |
| if (dictionaryProperty().flags & flag) |
| m_properties.flags |= flag; |
| else |
| m_properties.flags &= ~flag; |
| break; |
| } |
| } |
| |
| bool MathMLOperatorElement::hasProperty(MathMLOperatorDictionary::Flag flag) |
| { |
| if (m_properties.dirtyFlags & flag) { |
| computeOperatorFlag(flag); |
| m_properties.dirtyFlags &= ~flag; |
| } |
| return m_properties.flags & flag; |
| } |
| |
| MathMLElement::Length MathMLOperatorElement::defaultLeadingSpace() |
| { |
| Length space; |
| space.type = LengthType::MathUnit; |
| space.value = static_cast<float>(dictionaryProperty().leadingSpaceInMathUnit); |
| return space; |
| } |
| |
| MathMLElement::Length MathMLOperatorElement::defaultTrailingSpace() |
| { |
| Length space; |
| space.type = LengthType::MathUnit; |
| space.value = static_cast<float>(dictionaryProperty().trailingSpaceInMathUnit); |
| return space; |
| } |
| |
| const MathMLElement::Length& MathMLOperatorElement::leadingSpace() |
| { |
| return cachedMathMLLength(MathMLNames::lspaceAttr, m_leadingSpace); |
| } |
| |
| const MathMLElement::Length& MathMLOperatorElement::trailingSpace() |
| { |
| return cachedMathMLLength(MathMLNames::rspaceAttr, m_trailingSpace); |
| } |
| |
| const MathMLElement::Length& MathMLOperatorElement::minSize() |
| { |
| return cachedMathMLLength(MathMLNames::minsizeAttr, m_minSize); |
| } |
| |
| const MathMLElement::Length& MathMLOperatorElement::maxSize() |
| { |
| if (m_maxSize) |
| return m_maxSize.value(); |
| |
| const AtomicString& value = attributeWithoutSynchronization(MathMLNames::maxsizeAttr); |
| if (value == "infinity") { |
| Length maxsize; |
| maxsize.type = LengthType::Infinity; |
| m_maxSize = maxsize; |
| } else |
| m_maxSize = parseMathMLLength(value); |
| |
| return m_maxSize.value(); |
| } |
| |
| void MathMLOperatorElement::childrenChanged(const ChildChange& change) |
| { |
| m_operatorChar = WTF::nullopt; |
| m_dictionaryProperty = WTF::nullopt; |
| m_properties.dirtyFlags = MathMLOperatorDictionary::allFlags; |
| MathMLTokenElement::childrenChanged(change); |
| } |
| |
| static Optional<MathMLOperatorDictionary::Flag> attributeNameToPropertyFlag(const QualifiedName& name) |
| { |
| if (name == accentAttr) |
| return Accent; |
| if (name == fenceAttr) |
| return Fence; |
| if (name == largeopAttr) |
| return LargeOp; |
| if (name == movablelimitsAttr) |
| return MovableLimits; |
| if (name == separatorAttr) |
| return Separator; |
| if (name == stretchyAttr) |
| return Stretchy; |
| if (name == symmetricAttr) |
| return Symmetric; |
| return WTF::nullopt; |
| } |
| |
| void MathMLOperatorElement::parseAttribute(const QualifiedName& name, const AtomicString& value) |
| { |
| if (name == formAttr) { |
| m_dictionaryProperty = WTF::nullopt; |
| m_properties.dirtyFlags = MathMLOperatorDictionary::allFlags; |
| } else if (auto flag = attributeNameToPropertyFlag(name)) |
| m_properties.dirtyFlags |= flag.value(); |
| else if (name == lspaceAttr) |
| m_leadingSpace = WTF::nullopt; |
| else if (name == rspaceAttr) |
| m_trailingSpace = WTF::nullopt; |
| else if (name == minsizeAttr) |
| m_minSize = WTF::nullopt; |
| else if (name == maxsizeAttr) |
| m_maxSize = WTF::nullopt; |
| |
| if ((name == stretchyAttr || name == lspaceAttr || name == rspaceAttr || name == movablelimitsAttr) && renderer()) { |
| downcast<RenderMathMLOperator>(*renderer()).updateFromElement(); |
| return; |
| } |
| |
| MathMLTokenElement::parseAttribute(name, value); |
| } |
| |
| RenderPtr<RenderElement> MathMLOperatorElement::createElementRenderer(RenderStyle&& style, const RenderTreePosition&) |
| { |
| ASSERT(hasTagName(MathMLNames::moTag)); |
| return createRenderer<RenderMathMLOperator>(*this, WTFMove(style)); |
| } |
| |
| } |
| |
| #endif // ENABLE(MATHML) |