Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 311 insertions, 0 deletions

diff --git a/editor/libeditor/ChangeStyleTransaction.cpp b/editor/libeditor/ChangeStyleTransaction.cpp
new file mode 100644
index 0000000000..2215066802
--- /dev/null
+++ b/editor/libeditor/ChangeStyleTransaction.cpp
@@ -0,0 +1,311 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/ChangeStyleTransaction.h"
+
+#include "mozilla/dom/Element.h"  // for Element
+#include "nsAString.h"            // for nsAString::Append, etc.
+#include "nsCRT.h"                // for nsCRT::IsAsciiSpace
+#include "nsDebug.h"              // for NS_WARNING, etc.
+#include "nsError.h"              // for NS_ERROR_NULL_POINTER, etc.
+#include "nsGkAtoms.h"            // for nsGkAtoms, etc.
+#include "nsICSSDeclaration.h"    // for nsICSSDeclaration.
+#include "nsLiteralString.h"      // for NS_LITERAL_STRING, etc.
+#include "nsReadableUtils.h"      // for ToNewUnicode
+#include "nsString.h"             // for nsAutoString, nsString, etc.
+#include "nsStyledElement.h"      // for nsStyledElement.
+#include "nsUnicharUtils.h"       // for nsCaseInsensitiveStringComparator
+
+namespace mozilla {
+
+using namespace dom;
+
+// static
+already_AddRefed<ChangeStyleTransaction> ChangeStyleTransaction::Create(
+    nsStyledElement& aStyledElement, nsAtom& aProperty,
+    const nsAString& aValue) {
+  RefPtr<ChangeStyleTransaction> transaction =
+      new ChangeStyleTransaction(aStyledElement, aProperty, aValue, false);
+  return transaction.forget();
+}
+
+// static
+already_AddRefed<ChangeStyleTransaction> ChangeStyleTransaction::CreateToRemove(
+    nsStyledElement& aStyledElement, nsAtom& aProperty,
+    const nsAString& aValue) {
+  RefPtr<ChangeStyleTransaction> transaction =
+      new ChangeStyleTransaction(aStyledElement, aProperty, aValue, true);
+  return transaction.forget();
+}
+
+ChangeStyleTransaction::ChangeStyleTransaction(nsStyledElement& aStyledElement,
+                                               nsAtom& aProperty,
+                                               const nsAString& aValue,
+                                               bool aRemove)
+    : EditTransactionBase(),
+      mStyledElement(&aStyledElement),
+      mProperty(&aProperty),
+      mUndoValue(),
+      mRedoValue(),
+      mRemoveProperty(aRemove),
+      mUndoAttributeWasSet(false),
+      mRedoAttributeWasSet(false) {
+  CopyUTF16toUTF8(aValue, mValue);
+}
+
+#define kNullCh ('\0')
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(ChangeStyleTransaction, EditTransactionBase,
+                                   mStyledElement)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ChangeStyleTransaction)
+NS_INTERFACE_MAP_END_INHERITING(EditTransactionBase)
+
+NS_IMPL_ADDREF_INHERITED(ChangeStyleTransaction, EditTransactionBase)
+NS_IMPL_RELEASE_INHERITED(ChangeStyleTransaction, EditTransactionBase)
+
+// Answers true if aValue is in the string list of white-space separated values
+// aValueList.
+bool ChangeStyleTransaction::ValueIncludes(const nsACString& aValueList,
+                                           const nsACString& aValue) {
+  nsAutoCString valueList(aValueList);
+  bool result = false;
+
+  // put an extra null at the end
+  valueList.Append(kNullCh);
+
+  char* start = valueList.BeginWriting();
+  char* end = start;
+
+  while (kNullCh != *start) {
+    while (kNullCh != *start && nsCRT::IsAsciiSpace(*start)) {
+      // skip leading space
+      start++;
+    }
+    end = start;
+
+    while (kNullCh != *end && !nsCRT::IsAsciiSpace(*end)) {
+      // look for space or end
+      end++;
+    }
+    // end string here
+    *end = kNullCh;
+
+    if (start < end) {
+      if (aValue.Equals(nsDependentCString(start),
+                        nsCaseInsensitiveCStringComparator)) {
+        result = true;
+        break;
+      }
+    }
+    start = ++end;
+  }
+  return result;
+}
+
+// Removes the value aRemoveValue from the string list of white-space separated
+// values aValueList
+void ChangeStyleTransaction::RemoveValueFromListOfValues(
+    nsACString& aValues, const nsACString& aRemoveValue) {
+  nsAutoCString classStr(aValues);
+  nsAutoCString outString;
+  // put an extra null at the end
+  classStr.Append(kNullCh);
+
+  char* start = classStr.BeginWriting();
+  char* end = start;
+
+  while (kNullCh != *start) {
+    while (kNullCh != *start && nsCRT::IsAsciiSpace(*start)) {
+      // skip leading space
+      start++;
+    }
+    end = start;
+
+    while (kNullCh != *end && !nsCRT::IsAsciiSpace(*end)) {
+      // look for space or end
+      end++;
+    }
+    // end string here
+    *end = kNullCh;
+
+    if (start < end && !aRemoveValue.Equals(start)) {
+      outString.Append(start);
+      outString.Append(' ');
+    }
+
+    start = ++end;
+  }
+  aValues.Assign(outString);
+}
+
+NS_IMETHODIMP ChangeStyleTransaction::DoTransaction() {
+  if (NS_WARN_IF(!mStyledElement)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  OwningNonNull<nsStyledElement> styledElement = *mStyledElement;
+  nsCOMPtr<nsICSSDeclaration> cssDecl = styledElement->Style();
+
+  // FIXME(bug 1606994): Using atoms forces a string copy here which is not
+  // great.
+  nsAutoCString propertyNameString;
+  mProperty->ToUTF8String(propertyNameString);
+
+  mUndoAttributeWasSet =
+      mStyledElement->HasAttr(kNameSpaceID_None, nsGkAtoms::style);
+
+  nsAutoCString values;
+  nsresult rv = cssDecl->GetPropertyValue(propertyNameString, values);
+  if (NS_FAILED(rv)) {
+    NS_WARNING("nsICSSDeclaration::GetPropertyPriorityValue() failed");
+    return rv;
+  }
+  mUndoValue.Assign(values);
+
+  // Does this property accept more than one value? (bug 62682)
+  bool multiple = AcceptsMoreThanOneValue(*mProperty);
+
+  if (mRemoveProperty) {
+    nsAutoCString returnString;
+    if (multiple) {
+      // Let's remove only the value we have to remove and not the others
+      RemoveValueFromListOfValues(values, "none"_ns);
+      RemoveValueFromListOfValues(values, mValue);
+      if (values.IsEmpty()) {
+        ErrorResult error;
+        cssDecl->RemoveProperty(propertyNameString, returnString, error);
+        if (error.Failed()) {
+          NS_WARNING("nsICSSDeclaration::RemoveProperty() failed");
+          return error.StealNSResult();
+        }
+      } else {
+        ErrorResult error;
+        nsAutoCString priority;
+        cssDecl->GetPropertyPriority(propertyNameString, priority);
+        cssDecl->SetProperty(propertyNameString, values, priority, error);
+        if (error.Failed()) {
+          NS_WARNING("nsICSSDeclaration::SetProperty() failed");
+          return error.StealNSResult();
+        }
+      }
+    } else {
+      ErrorResult error;
+      cssDecl->RemoveProperty(propertyNameString, returnString, error);
+      if (error.Failed()) {
+        NS_WARNING("nsICSSDeclaration::RemoveProperty() failed");
+        return error.StealNSResult();
+      }
+    }
+  } else {
+    nsAutoCString priority;
+    cssDecl->GetPropertyPriority(propertyNameString, priority);
+    if (multiple) {
+      // Let's add the value we have to add to the others
+      AddValueToMultivalueProperty(values, mValue);
+    } else {
+      values.Assign(mValue);
+    }
+    ErrorResult error;
+    cssDecl->SetProperty(propertyNameString, values, priority, error);
+    if (error.Failed()) {
+      NS_WARNING("nsICSSDeclaration::SetProperty() failed");
+      return error.StealNSResult();
+    }
+  }
+
+  // Let's be sure we don't keep an empty style attribute
+  uint32_t length = cssDecl->Length();
+  if (!length) {
+    nsresult rv =
+        styledElement->UnsetAttr(kNameSpaceID_None, nsGkAtoms::style, true);
+    if (NS_FAILED(rv)) {
+      NS_WARNING("Element::UnsetAttr(nsGkAtoms::style) failed");
+      return rv;
+    }
+  } else {
+    mRedoAttributeWasSet = true;
+  }
+
+  rv = cssDecl->GetPropertyValue(propertyNameString, mRedoValue);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "nsICSSDeclaration::GetPropertyValue() failed");
+  return rv;
+}
+
+nsresult ChangeStyleTransaction::SetStyle(bool aAttributeWasSet,
+                                          nsACString& aValue) {
+  if (NS_WARN_IF(!mStyledElement)) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (aAttributeWasSet) {
+    OwningNonNull<nsStyledElement> styledElement = *mStyledElement;
+
+    // The style attribute was not empty, let's recreate the declaration
+    nsAutoCString propertyNameString;
+    mProperty->ToUTF8String(propertyNameString);
+
+    nsCOMPtr<nsICSSDeclaration> cssDecl = styledElement->Style();
+
+    ErrorResult error;
+    if (aValue.IsEmpty()) {
+      // An empty value means we have to remove the property
+      nsAutoCString returnString;
+      cssDecl->RemoveProperty(propertyNameString, returnString, error);
+      if (error.Failed()) {
+        NS_WARNING("nsICSSDeclaration::RemoveProperty() failed");
+        return error.StealNSResult();
+      }
+    }
+    // Let's recreate the declaration as it was
+    nsAutoCString priority;
+    cssDecl->GetPropertyPriority(propertyNameString, priority);
+    cssDecl->SetProperty(propertyNameString, aValue, priority, error);
+    NS_WARNING_ASSERTION(!error.Failed(),
+                         "nsICSSDeclaration::SetProperty() failed");
+    return error.StealNSResult();
+  }
+
+  OwningNonNull<nsStyledElement> styledElement = *mStyledElement;
+  nsresult rv =
+      styledElement->UnsetAttr(kNameSpaceID_None, nsGkAtoms::style, true);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "Element::UnsetAttr(nsGkAtoms::style) failed");
+  return rv;
+}
+
+NS_IMETHODIMP ChangeStyleTransaction::UndoTransaction() {
+  nsresult rv = SetStyle(mUndoAttributeWasSet, mUndoValue);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "ChangeStyleTransaction::SetStyle() failed");
+  return rv;
+}
+
+NS_IMETHODIMP ChangeStyleTransaction::RedoTransaction() {
+  nsresult rv = SetStyle(mRedoAttributeWasSet, mRedoValue);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv),
+                       "ChangeStyleTransaction::SetStyle() failed");
+  return rv;
+}
+
+// True if the CSS property accepts more than one value
+bool ChangeStyleTransaction::AcceptsMoreThanOneValue(nsAtom& aCSSProperty) {
+  return &aCSSProperty == nsGkAtoms::text_decoration;
+}
+
+// Adds the value aNewValue to the list of white-space separated values aValues
+void ChangeStyleTransaction::AddValueToMultivalueProperty(
+    nsACString& aValues, const nsACString& aNewValue) {
+  if (aValues.IsEmpty() || aValues.LowerCaseEqualsLiteral("none")) {
+    aValues.Assign(aNewValue);
+  } else if (!ValueIncludes(aValues, aNewValue)) {
+    // We already have another value but not this one; add it
+    aValues.Append(char16_t(' '));
+    aValues.Append(aNewValue);
+  }
+}
+
+}  // namespace mozilla