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nsHTMLTableCellElement.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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#include "nsIDOMHTMLTableCellElement.h"
#include "nsIDOMHTMLTableRowElement.h"
#include "nsIDOMHTMLCollection.h"
#include "nsIDOMEventTarget.h"
#include "nsMappedAttributes.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsStyleConsts.h"
#include "nsPresContext.h"
#include "nsRuleData.h"
#include "nsIDocument.h"

class nsHTMLTableCellElement : public nsGenericHTMLElement,
                               public nsIDOMHTMLTableCellElement
{
public:
  nsHTMLTableCellElement(nsINodeInfo *aNodeInfo);
  virtual ~nsHTMLTableCellElement();

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED

  // nsIDOMNode
  NS_FORWARD_NSIDOMNODE(nsGenericHTMLElement::)

  // nsIDOMElement
  NS_FORWARD_NSIDOMELEMENT(nsGenericHTMLElement::)

  // nsIDOMHTMLElement
  NS_FORWARD_NSIDOMHTMLELEMENT(nsGenericHTMLElement::)

  // nsIDOMHTMLTableCellElement
  NS_DECL_NSIDOMHTMLTABLECELLELEMENT

  virtual PRBool ParseAttribute(PRInt32 aNamespaceID,
                                nsIAtom* aAttribute,
                                const nsAString& aValue,
                                nsAttrValue& aResult);
  virtual nsMapRuleToAttributesFunc GetAttributeMappingFunction() const;
  NS_IMETHOD WalkContentStyleRules(nsRuleWalker* aRuleWalker);
  NS_IMETHOD_(PRBool) IsAttributeMapped(const nsIAtom* aAttribute) const;

  virtual nsresult Clone(nsINodeInfo *aNodeInfo, nsINode **aResult) const;

protected:
  // This does not return a nsresult since all we care about is if we
  // found the row element that this cell is in or not.
  void GetRow(nsIDOMHTMLTableRowElement** aRow);
  nsIContent * GetTable();
};


NS_IMPL_NS_NEW_HTML_ELEMENT(TableCell)


nsHTMLTableCellElement::nsHTMLTableCellElement(nsINodeInfo *aNodeInfo)
  : nsGenericHTMLElement(aNodeInfo)
{
}

nsHTMLTableCellElement::~nsHTMLTableCellElement()
{
}


NS_IMPL_ADDREF_INHERITED(nsHTMLTableCellElement, nsGenericElement) 
NS_IMPL_RELEASE_INHERITED(nsHTMLTableCellElement, nsGenericElement) 


// QueryInterface implementation for nsHTMLTableCellElement
NS_HTML_CONTENT_INTERFACE_TABLE_HEAD(nsHTMLTableCellElement,
                                     nsGenericHTMLElement)
  NS_INTERFACE_TABLE_INHERITED1(nsHTMLTableCellElement,
                                nsIDOMHTMLTableCellElement)
NS_HTML_CONTENT_INTERFACE_TABLE_TAIL_CLASSINFO(HTMLTableCellElement)


NS_IMPL_ELEMENT_CLONE(nsHTMLTableCellElement)


// protected method
void
nsHTMLTableCellElement::GetRow(nsIDOMHTMLTableRowElement** aRow)
{
  *aRow = nsnull;

  nsCOMPtr<nsIDOMNode> rowNode;
  GetParentNode(getter_AddRefs(rowNode));

  if (rowNode) {
    CallQueryInterface(rowNode, aRow);
  }
}

// protected method
nsIContent*
nsHTMLTableCellElement::GetTable()
{
  nsIContent *result = nsnull;

  nsIContent *parent = GetParent();
  if (parent) {  // GetParent() should be a row
    nsIContent* section = parent->GetParent();
    if (section) {
      if (section->IsNodeOfType(eHTML) &&
          section->NodeInfo()->Equals(nsGkAtoms::table)) {
        // XHTML, without a row group
        result = section;
      } else {
        // we have a row group.
        result = section->GetParent();
      }
    }
  }
  return result;
}

NS_IMETHODIMP
nsHTMLTableCellElement::GetCellIndex(PRInt32* aCellIndex)
{
  *aCellIndex = -1;

  nsCOMPtr<nsIDOMHTMLTableRowElement> row;

  GetRow(getter_AddRefs(row));

  if (!row) {
    return NS_OK;
  }

  nsCOMPtr<nsIDOMHTMLCollection> cells;

  row->GetCells(getter_AddRefs(cells));

  if (!cells) {
    return NS_OK;
  }

  PRUint32 numCells;
  cells->GetLength(&numCells);

  PRBool found = PR_FALSE;
  PRUint32 i;

  for (i = 0; (i < numCells) && !found; i++) {
    nsCOMPtr<nsIDOMNode> node;
    cells->Item(i, getter_AddRefs(node));

    if (node.get() == static_cast<nsIDOMNode *>(this)) {
      *aCellIndex = i;
      found = PR_TRUE;
    }
  }

  return NS_OK;
}


NS_IMETHODIMP
nsHTMLTableCellElement::WalkContentStyleRules(nsRuleWalker* aRuleWalker)
{
  nsresult rv = nsGenericHTMLElement::WalkContentStyleRules(aRuleWalker);
  NS_ENSURE_SUCCESS(rv, rv);

  // Add style information from the mapped attributes of the table
  // element.  This depends on the strange behavior of the
  // |MapAttributesIntoRule| in nsHTMLTableElement.cpp, which is
  // technically incorrect since it's violating the nsIStyleRule
  // contract.  However, things are OK (except for the incorrect
  // dependence on display type rather than tag) since tables and cells
  // match different, less specific, rules.
  nsIContent* table = GetTable();
  if (table) {
    rv = table->WalkContentStyleRules(aRuleWalker);
  }

  return rv;
}


NS_IMPL_STRING_ATTR(nsHTMLTableCellElement, Abbr, abbr)
NS_IMPL_STRING_ATTR(nsHTMLTableCellElement, Axis, axis)
NS_IMPL_STRING_ATTR(nsHTMLTableCellElement, BgColor, bgcolor)
NS_IMPL_STRING_ATTR_DEFAULT_VALUE(nsHTMLTableCellElement, Ch, _char, ".")
NS_IMPL_STRING_ATTR(nsHTMLTableCellElement, ChOff, charoff)
NS_IMPL_INT_ATTR_DEFAULT_VALUE(nsHTMLTableCellElement, ColSpan, colspan, 1)
NS_IMPL_STRING_ATTR(nsHTMLTableCellElement, Headers, headers)
NS_IMPL_STRING_ATTR(nsHTMLTableCellElement, Height, height)
NS_IMPL_BOOL_ATTR(nsHTMLTableCellElement, NoWrap, nowrap)
NS_IMPL_INT_ATTR_DEFAULT_VALUE(nsHTMLTableCellElement, RowSpan, rowspan, 1)
NS_IMPL_STRING_ATTR(nsHTMLTableCellElement, Scope, scope)
NS_IMPL_STRING_ATTR_DEFAULT_VALUE(nsHTMLTableCellElement, VAlign, valign, "middle")
NS_IMPL_STRING_ATTR(nsHTMLTableCellElement, Width, width)


NS_IMETHODIMP
nsHTMLTableCellElement::GetAlign(nsAString& aValue)
{
  if (!GetAttr(kNameSpaceID_None, nsGkAtoms::align, aValue)) {
    // There's no align attribute, ask the row for the alignment.

    nsCOMPtr<nsIDOMHTMLTableRowElement> row;
    GetRow(getter_AddRefs(row));

    if (row) {
      return row->GetAlign(aValue);
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsHTMLTableCellElement::SetAlign(const nsAString& aValue)
{
  return SetAttr(kNameSpaceID_None, nsGkAtoms::align, aValue, PR_TRUE);
}


static const nsAttrValue::EnumTable kCellScopeTable[] = {
  { "row",      NS_STYLE_CELL_SCOPE_ROW },
  { "col",      NS_STYLE_CELL_SCOPE_COL },
  { "rowgroup", NS_STYLE_CELL_SCOPE_ROWGROUP },
  { "colgroup", NS_STYLE_CELL_SCOPE_COLGROUP },
  { 0 }
};

#define MAX_ROWSPAN 8190 // celldata.h can not handle more
#define MAX_COLSPAN 1000 // limit as IE and opera do

PRBool
nsHTMLTableCellElement::ParseAttribute(PRInt32 aNamespaceID,
                                       nsIAtom* aAttribute,
                                       const nsAString& aValue,
                                       nsAttrValue& aResult)
{
  if (aNamespaceID == kNameSpaceID_None) {
    /* ignore these attributes, stored simply as strings
       abbr, axis, ch, headers
    */
    if (aAttribute == nsGkAtoms::charoff) {
      /* attributes that resolve to integers with a min of 0 */
      return aResult.ParseIntWithBounds(aValue, 0);
    }
    if (aAttribute == nsGkAtoms::colspan) {
      PRBool res = aResult.ParseIntWithBounds(aValue, -1);
      if (res) {
        PRInt32 val = aResult.GetIntegerValue();
        // reset large colspan values as IE and opera do
        // quirks mode does not honor the special html 4 value of 0
        if (val > MAX_COLSPAN || val < 0 ||
            (0 == val && InNavQuirksMode(GetOwnerDoc()))) {
          aResult.SetTo(1);
        }
      }
      return res;
    }
    if (aAttribute == nsGkAtoms::rowspan) {
      PRBool res = aResult.ParseIntWithBounds(aValue, -1, MAX_ROWSPAN);
      if (res) {
        PRInt32 val = aResult.GetIntegerValue();
        // quirks mode does not honor the special html 4 value of 0
        if (val < 0 || (0 == val && InNavQuirksMode(GetOwnerDoc()))) {
          aResult.SetTo(1);
        }
      }
      return res;
    }
    if (aAttribute == nsGkAtoms::height) {
      return aResult.ParseSpecialIntValue(aValue, PR_TRUE, PR_FALSE);
    }
    if (aAttribute == nsGkAtoms::width) {
      return aResult.ParseSpecialIntValue(aValue, PR_TRUE, PR_FALSE);
    }
    if (aAttribute == nsGkAtoms::align) {
      return ParseTableCellHAlignValue(aValue, aResult);
    }
    if (aAttribute == nsGkAtoms::bgcolor) {
      return aResult.ParseColor(aValue, GetOwnerDoc());
    }
    if (aAttribute == nsGkAtoms::scope) {
      return aResult.ParseEnumValue(aValue, kCellScopeTable);
    }
    if (aAttribute == nsGkAtoms::valign) {
      return ParseTableVAlignValue(aValue, aResult);
    }
  }

  return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
                                              aResult);
}

static 
void MapAttributesIntoRule(const nsMappedAttributes* aAttributes,
                           nsRuleData* aData)
{
  if (aData->mSID == eStyleStruct_Position) {
    // width: value
    if (aData->mPositionData->mWidth.GetUnit() == eCSSUnit_Null) {
      const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::width);
      if (value && value->Type() == nsAttrValue::eInteger) {
        if (value->GetIntegerValue() > 0)
          aData->mPositionData->mWidth.SetFloatValue((float)value->GetIntegerValue(), eCSSUnit_Pixel); 
        // else 0 implies auto for compatibility.
      }
      else if (value && value->Type() == nsAttrValue::ePercent) {
        if (value->GetPercentValue() > 0.0f)
          aData->mPositionData->mWidth.SetPercentValue(value->GetPercentValue());
        // else 0 implies auto for compatibility
      }
    }

    // height: value
    if (aData->mPositionData->mHeight.GetUnit() == eCSSUnit_Null) {
      const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::height);
      if (value && value->Type() == nsAttrValue::eInteger) {
        if (value->GetIntegerValue() > 0)
          aData->mPositionData->mHeight.SetFloatValue((float)value->GetIntegerValue(), eCSSUnit_Pixel);
        // else 0 implies auto for compatibility.
      }
      else if (value && value->Type() == nsAttrValue::ePercent) {
        if (value->GetPercentValue() > 0.0f)
          aData->mPositionData->mHeight.SetPercentValue(value->GetPercentValue());
        // else 0 implies auto for compatibility
      }
    }
  }
  else if (aData->mSID == eStyleStruct_Text) {
    if (aData->mTextData->mTextAlign.GetUnit() == eCSSUnit_Null) {
      // align: enum
      const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::align);
      if (value && value->Type() == nsAttrValue::eEnum)
        aData->mTextData->mTextAlign.SetIntValue(value->GetEnumValue(), eCSSUnit_Enumerated);
    }

    if (aData->mTextData->mWhiteSpace.GetUnit() == eCSSUnit_Null) {
      // nowrap: enum
      if (aAttributes->GetAttr(nsGkAtoms::nowrap)) {
        // See if our width is not a integer width.
        const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::width);
        nsCompatibility mode = aData->mPresContext->CompatibilityMode();
        if (!value || value->Type() != nsAttrValue::eInteger || eCompatibility_NavQuirks != mode)
          aData->mTextData->mWhiteSpace.SetIntValue(NS_STYLE_WHITESPACE_NOWRAP, eCSSUnit_Enumerated);
      }
    }
  }
  else if (aData->mSID == eStyleStruct_TextReset) {
    if (aData->mTextData->mVerticalAlign.GetUnit() == eCSSUnit_Null) {
      // valign: enum
      const nsAttrValue* value = aAttributes->GetAttr(nsGkAtoms::valign);
      if (value && value->Type() == nsAttrValue::eEnum)
        aData->mTextData->mVerticalAlign.SetIntValue(value->GetEnumValue(), eCSSUnit_Enumerated);
    }
  }
  
  nsGenericHTMLElement::MapBackgroundAttributesInto(aAttributes, aData);
  nsGenericHTMLElement::MapCommonAttributesInto(aAttributes, aData);
}

NS_IMETHODIMP_(PRBool)
nsHTMLTableCellElement::IsAttributeMapped(const nsIAtom* aAttribute) const
{
  static const MappedAttributeEntry attributes[] = {
    { &nsGkAtoms::align }, 
    { &nsGkAtoms::valign },
    { &nsGkAtoms::nowrap },
#if 0
    // XXXldb If these are implemented, they might need to move to
    // GetAttributeChangeHint (depending on how, and preferably not).
    { &nsGkAtoms::abbr },
    { &nsGkAtoms::axis },
    { &nsGkAtoms::headers },
    { &nsGkAtoms::scope },
#endif
    { &nsGkAtoms::width },
    { &nsGkAtoms::height },
    { nsnull }
  };

  static const MappedAttributeEntry* const map[] = {
    attributes,
    sCommonAttributeMap,
    sBackgroundAttributeMap,
  };

  return FindAttributeDependence(aAttribute, map, NS_ARRAY_LENGTH(map));
}

nsMapRuleToAttributesFunc
nsHTMLTableCellElement::GetAttributeMappingFunction() const
{
  return &MapAttributesIntoRule;
}

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