Partial implementation of inline StylePropertyMap.

third_party/WebKit/Source/core/css/cssom/InlineStylePropertyMap.cpp

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/css/cssom/InlineStylePropertyMap.h"
+
+#include "core/CSSPropertyNames.h"
+#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/CSSPropertyMetadata.h"
+#include "core/css/CSSValueList.h"
+#include "core/css/StylePropertySet.h"
+#include "core/css/cssom/CSSOMTypes.h"
+#include "core/css/cssom/SimpleLength.h"
+#include "core/css/cssom/StyleValueFactory.h"
+
+namespace blink {
+
+StyleValue* InlineStylePropertyMap::get(CSSPropertyID propertyID)
+{
+    ASSERT(propertyID != CSSPropertyInvalid);
+
+    updatePropertyIfNeeded(propertyID);
+
+    if (!m_styles.contains(propertyID)) {
+        return nullptr;
+    }
+    StyleValueVector& styleVector = ensurePropertyList(propertyID);
+    if (styleVector.isEmpty()) {
+        return nullptr;
+    }
+    return styleVector.at(0);
+}
+
+StyleValueVector InlineStylePropertyMap::getAll(CSSPropertyID propertyID)
+{
+    ASSERT(propertyID != CSSPropertyInvalid);
+
+    updatePropertyIfNeeded(propertyID);
+
+    if (!m_styles.contains(propertyID))
+        return StyleValueVector();
+
+    return ensurePropertyList(propertyID);
+}
+
+bool InlineStylePropertyMap::has(CSSPropertyID propertyID)
+{
+    ASSERT(propertyID != CSSPropertyInvalid);
+    return m_styles.contains(propertyID) && (!ensurePropertyList(propertyID).isEmpty());
+}
+
+Vector<String> InlineStylePropertyMap::getProperties()
+{
+    Vector<String> result;
+    StylePropertySet& inlineStyleSet = m_ownerElement->ensureMutableInlineStyle();
+    for (unsigned i = 0; i < inlineStyleSet.propertyCount(); i++) {
+        CSSPropertyID cssPropertyID = inlineStyleSet.propertyAt(i).id();
+        // TODO(meade): Consider whether this is necessary here.
+        updatePropertyIfNeeded(cssPropertyID);
+        result.append(getPropertyNameString(cssPropertyID));
+    }
+    return result;
+}
+
+void InlineStylePropertyMap::set(CSSPropertyID propertyID, StyleValueOrStyleValueSequenceOrString& item, ExceptionState& exceptionState)
+{
+    ASSERT(propertyID != CSSPropertyInvalid);
+    if (!item.isNull()) {

[Timothy Loh, 2016/03/23 03:45:09]

IMO clearer to not negate here and switch the order of the blocks.

[meade_UTC10, 2016/03/29 06:27:36]

Done.

+        m_styles.remove(propertyID);
+        append(propertyID, item, exceptionState);
+    } else {
+        // Clear it.

[Timothy Loh, 2016/03/23 03:45:08]

I don't think this is a useful comment.

[meade_UTC10, 2016/03/29 06:27:36]

Removed.

+        remove(propertyID, exceptionState);
+    }
+}
+
+void InlineStylePropertyMap::append(CSSPropertyID propertyID, StyleValueOrStyleValueSequenceOrString& item, ExceptionState& exceptionState)
+{
+    ASSERT(propertyID != CSSPropertyInvalid);
+
+    StyleValueVector& values = ensurePropertyList(propertyID);
+    bool supportsMultiple = CSSPropertyMetadata::propertySupportsMultiple(propertyID);
+
+    if (item.isStyleValue()) {
+        // Setting a single value.
+        StyleValue* value = item.getAsStyleValue();
+        if (!CSSOMTypes::propertyCanTake(propertyID, *value)) {
+            exceptionState.throwTypeError("Invalid type for property");
+            return;
+        }
+        if (!values.isEmpty() && !supportsMultiple) {
+            exceptionState.throwTypeError("Property does not support multiple values");
+            return;
+        }
+        values.append(value);
+
+    } else if (item.isStyleValueSequence()) {
+        if (!CSSPropertyMetadata::propertySupportsMultiple(propertyID)) {

[Timothy Loh, 2016/03/23 03:45:09]

!supportsMultiple

[meade_UTC10, 2016/03/29 06:27:36]

Done.

+            exceptionState.throwTypeError("Property does not support multiple values");

[Timothy Loh, 2016/03/23 03:45:09]

need a return here?

[meade_UTC10, 2016/03/29 06:27:36]

Done.

+        }
+        // Check all the values in the sequence to make sure they're valid.
+        const StyleValueVector specifiedValues = item.getAsStyleValueSequence();
+        for (const Member<StyleValue> value : specifiedValues) {
+            if (!CSSOMTypes::propertyCanTake(propertyID, *value)) {
+                exceptionState.throwTypeError("Invalid type for property");
+                return;
+            }
+        }
+        values.appendVector(specifiedValues);
+
+    } else if (item.isNull()) {

[Timothy Loh, 2016/03/23 03:45:09]

IMO put this last (so the if structure matches the type name) and just make it

} else {
    ASSERT(item.isNull());
    return;
}

so anyone reading the code doesn't wonder if there's some case we didn't handle
here.

[meade_UTC10, 2016/03/29 06:27:36]

Done.

+        // No-op
+        return;
+    } else if (item.isString()) {
+        // Parse it.
+        // TODO(meade): Implement this.
+        exceptionState.throwTypeError("Not implemented yet");
+        return;
+    }
+
+    if (supportsMultiple) {
+        RefPtrWillBeRawPtr<CSSValueList> valueList = CSSValueList::createSpaceSeparated();
+        for (const Member<StyleValue> value : values) {
+            valueList->append(value->toCSSValue());
+        }
+        m_ownerElement->setInlineStyleProperty(propertyID, valueList);
+    } else {
+        m_ownerElement->setInlineStyleProperty(propertyID, values[0]->toCSSValue());
+    }
+    m_cleanStyles.set(propertyID, true);
+}
+
+void InlineStylePropertyMap::remove(CSSPropertyID propertyID, ExceptionState& exceptionState)
+{
+    ASSERT(propertyID != CSSPropertyInvalid);
+
+    const StyleVectorMap::iterator& iterator = m_styles.find(propertyID);
+    if (iterator == m_styles.end())
+        return;
+
+    m_styles.remove(iterator);
+    m_ownerElement->removeInlineStyleProperty(propertyID);
+    m_cleanStyles.set(propertyID, true);
+}
+
+void InlineStylePropertyMap::updatePropertyIfNeeded(CSSPropertyID propertyID)
+{
+    if (m_cleanStyles.contains(propertyID) && m_cleanStyles.get(propertyID)) {
+        return;
+    }
+
+    RefPtrWillBeRawPtr<CSSValue> cssValue = m_ownerElement->ensureMutableInlineStyle().getPropertyCSSValue(propertyID);
+    if (!cssValue) {
+        m_styles.remove(propertyID);
+        m_cleanStyles.set(propertyID, true);
+        return;
+    }
+
+    StyleValueVector& values = ensurePropertyList(propertyID);
+    values.clear();
+
+    if (!cssValue->isValueList()) {
+        StyleValue* styleValue = StyleValueFactory::create(propertyID, *cssValue);
+        if (styleValue) {
+            values.append(*styleValue);
+        }
+    }
+
+    if (values.isEmpty())
+        m_styles.remove(propertyID);
+
+    // TODO(meade) implement the other cases.
+
+    m_cleanStyles.set(propertyID, true);
+}
+
+void InlineStylePropertyMap::updateCustomProperty(const String& propertyName, PassRefPtrWillBeRawPtr<CSSValue> cssValue)
+{
+    // TODO(meade): Implement.
+}
+
+StyleValueVector& InlineStylePropertyMap::ensurePropertyList(CSSPropertyID propertyID)
+{
+    if (!m_styles.contains(propertyID)) {

[Timothy Loh, 2016/03/23 03:45:09]

Can probably make this a little more efficient in terms of hash lookups (does it
matter? I dunno..)

Something like:

..::iterator iterator = m_styles.find(propertyID);
if (!iterator)
    iterator = m_styles.set(propertyID, StyleValueVector())->storedValue;
return iterator->value;

[meade_UTC10, 2016/03/29 06:27:36]

Done.

+        m_styles.set(propertyID, StyleValueVector());
+    }
+    // Note: If you write return m_style.get(propertyID) here, you get a copy.
+    return m_styles.find(propertyID)->value;
+}
+
+} // namespace blink
+