gecko/layout/style/nsROCSSPrimitiveValue.cpp

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/* DOM object representing values in DOM computed style */

#include "nsROCSSPrimitiveValue.h"

#include "nsCOMPtr.h"
#include "nsDOMError.h"
#include "prprf.h"
#include "nsContentUtils.h"
#include "nsXPIDLString.h"
#include "nsCRT.h"
#include "nsPresContext.h"

nsROCSSPrimitiveValue::nsROCSSPrimitiveValue(PRInt32 aAppUnitsPerInch)
  : mType(CSS_PX), mAppUnitsPerInch(aAppUnitsPerInch)
{
  mValue.mAppUnits = 0;
}


nsROCSSPrimitiveValue::~nsROCSSPrimitiveValue()
{
  Reset();
}

void
nsROCSSPrimitiveValue::GetEscapedURI(nsIURI *aURI, PRUnichar **aReturn)
{
  nsCAutoString specUTF8;
  aURI->GetSpec(specUTF8);
  NS_ConvertUTF8toUTF16 spec(specUTF8);

  PRUint16 length = spec.Length();
  PRUnichar *escaped = (PRUnichar *)nsMemory::Alloc(length * 2 * sizeof(PRUnichar) + sizeof(PRUnichar('\0')));

  if (escaped) {
    PRUnichar *ptr = escaped;

    for (PRUint16 i = 0; i < length; ++i) {
      switch (spec[i]) {
        case ' ' : // space
        case '\t': // tab
        case '(' : // opening parenthesis
        case ')' : // closing parenthesis
        case '\'': // single quote
        case '"' : // double quote
        case ',' : // comma
        case '\\': // backslash
          // We have one of the above special characters.
          // Prepend it with a backslash.
          *ptr++ = '\\';
          break;
        default:
          break;
      }
      *ptr++ = spec[i];
    }
    *ptr = 0;
  }
  *aReturn = escaped;
}


NS_IMPL_ADDREF(nsROCSSPrimitiveValue)
NS_IMPL_RELEASE(nsROCSSPrimitiveValue)


// QueryInterface implementation for nsROCSSPrimitiveValue
NS_INTERFACE_MAP_BEGIN(nsROCSSPrimitiveValue)
  NS_INTERFACE_MAP_ENTRY(nsIDOMCSSPrimitiveValue)
  NS_INTERFACE_MAP_ENTRY(nsIDOMCSSValue)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMCSSPrimitiveValue)
  NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(ROCSSPrimitiveValue)
NS_INTERFACE_MAP_END


// nsIDOMCSSValue


NS_IMETHODIMP
nsROCSSPrimitiveValue::GetCssText(nsAString& aCssText)
{
  nsAutoString tmpStr;
  aCssText.Truncate();
  nsresult result = NS_OK;

  switch (mType) {
    case CSS_PX :
      {
        float val = nsPresContext::AppUnitsToFloatCSSPixels(mValue.mAppUnits);
        tmpStr.AppendFloat(val);
        tmpStr.AppendLiteral("px");
        break;
      }
    case CSS_IDENT :
      {
        const char *atomValue;
        mValue.mAtom->GetUTF8String(&atomValue);
        AppendUTF8toUTF16(atomValue, tmpStr);
        break;
      }
    case CSS_STRING :
      {
        tmpStr.Append(mValue.mString);
        break;
      }
    case CSS_URI :
      {
        nsXPIDLString uri;
        if (mValue.mURI) {
          GetEscapedURI(mValue.mURI, getter_Copies(uri));
          tmpStr.Assign(NS_LITERAL_STRING("url(") +
                        uri +
                        NS_LITERAL_STRING(")"));
        } else {
          // XXXldb Any better ideas?  It's good to have something that
          // doesn't parse so that things round-trip "correctly".
          tmpStr.Assign(NS_LITERAL_STRING("url(invalid-url:)"));
        }
        break;
      }
    case CSS_PERCENTAGE :
      {
        tmpStr.AppendFloat(mValue.mFloat * 100);
        tmpStr.Append(PRUnichar('%'));
        break;
      }
    case CSS_NUMBER :
      {
        tmpStr.AppendFloat(mValue.mFloat);
        break;
      }
    case CSS_RECT :
      {
        NS_ASSERTION(mValue.mRect, "mValue.mRect should never be null");
        NS_NAMED_LITERAL_STRING(comma, ", ");
        nsCOMPtr<nsIDOMCSSPrimitiveValue> sideCSSValue;
        nsAutoString sideValue;
        tmpStr.AssignLiteral("rect(");
        // get the top
        result = mValue.mRect->GetTop(getter_AddRefs(sideCSSValue));
        if (NS_FAILED(result))
          break;
        result = sideCSSValue->GetCssText(sideValue);
        if (NS_FAILED(result))
          break;
        tmpStr.Append(sideValue + comma);
        // get the right
        result = mValue.mRect->GetRight(getter_AddRefs(sideCSSValue));
        if (NS_FAILED(result))
          break;
        result = sideCSSValue->GetCssText(sideValue);
        if (NS_FAILED(result))
          break;
        tmpStr.Append(sideValue + comma);
        // get the bottom
        result = mValue.mRect->GetBottom(getter_AddRefs(sideCSSValue));
        if (NS_FAILED(result))
          break;
        result = sideCSSValue->GetCssText(sideValue);
        if (NS_FAILED(result))
          break;
        tmpStr.Append(sideValue + comma);
        // get the left
        result = mValue.mRect->GetLeft(getter_AddRefs(sideCSSValue));
        if (NS_FAILED(result))
          break;
        result = sideCSSValue->GetCssText(sideValue);
        if (NS_FAILED(result))
          break;
        tmpStr.Append(sideValue + NS_LITERAL_STRING(")"));
        break;
      }
    case CSS_RGBCOLOR :
      {
        NS_ASSERTION(mValue.mColor, "mValue.mColor should never be null");
        NS_NAMED_LITERAL_STRING(comma, ", ");
        nsCOMPtr<nsIDOMCSSPrimitiveValue> colorCSSValue;
        nsAutoString colorValue;
        if (mValue.mColor->HasAlpha())
          tmpStr.AssignLiteral("rgba(");
        else
          tmpStr.AssignLiteral("rgb(");

        // get the red component
        result = mValue.mColor->GetRed(getter_AddRefs(colorCSSValue));
        if (NS_FAILED(result))
          break;
        result = colorCSSValue->GetCssText(colorValue);
        if (NS_FAILED(result))
          break;
        tmpStr.Append(colorValue + comma);

        // get the green component
        result = mValue.mColor->GetGreen(getter_AddRefs(colorCSSValue));
        if (NS_FAILED(result))
          break;
        result = colorCSSValue->GetCssText(colorValue);
        if (NS_FAILED(result))
          break;
        tmpStr.Append(colorValue + comma);

        // get the blue component
        result = mValue.mColor->GetBlue(getter_AddRefs(colorCSSValue));
        if (NS_FAILED(result))
          break;
        result = colorCSSValue->GetCssText(colorValue);
        if (NS_FAILED(result))
          break;
        tmpStr.Append(colorValue);

        if (mValue.mColor->HasAlpha()) {
          // get the alpha component
          result = mValue.mColor->GetAlpha(getter_AddRefs(colorCSSValue));
          if (NS_FAILED(result))
            break;
          result = colorCSSValue->GetCssText(colorValue);
          if (NS_FAILED(result))
            break;
          tmpStr.Append(comma + colorValue);
        }

        tmpStr.Append(NS_LITERAL_STRING(")"));

        break;
      }
    case CSS_CM :
    case CSS_MM :
    case CSS_IN :
    case CSS_PT :
    case CSS_PC :
    case CSS_UNKNOWN :
    case CSS_EMS :
    case CSS_EXS :
    case CSS_DEG :
    case CSS_RAD :
    case CSS_GRAD :
    case CSS_MS :
    case CSS_S :
    case CSS_HZ :
    case CSS_KHZ :
    case CSS_DIMENSION :
    case CSS_ATTR :
    case CSS_COUNTER :
      NS_ERROR("We have a bogus value set.  This should not happen");
      return NS_ERROR_DOM_INVALID_ACCESS_ERR;
  }

  if (NS_SUCCEEDED(result)) {
    aCssText.Assign(tmpStr);
  }

  return NS_OK;
}


NS_IMETHODIMP
nsROCSSPrimitiveValue::SetCssText(const nsAString& aCssText)
{
  return NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR;
}


NS_IMETHODIMP
nsROCSSPrimitiveValue::GetCssValueType(PRUint16* aValueType)
{
  NS_ENSURE_ARG_POINTER(aValueType);
  *aValueType = nsIDOMCSSValue::CSS_PRIMITIVE_VALUE;
  return NS_OK;
}


// nsIDOMCSSPrimitiveValue

NS_IMETHODIMP
nsROCSSPrimitiveValue::GetPrimitiveType(PRUint16* aPrimitiveType)
{
  NS_ENSURE_ARG_POINTER(aPrimitiveType);
  *aPrimitiveType = mType;

  return NS_OK;
}


NS_IMETHODIMP
nsROCSSPrimitiveValue::SetFloatValue(PRUint16 aUnitType, float aFloatValue)
{
  return NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR;
}


NS_IMETHODIMP
nsROCSSPrimitiveValue::GetFloatValue(PRUint16 aUnitType, float* aReturn)
{
  NS_ENSURE_ARG_POINTER(aReturn);
  *aReturn = 0;

  switch(aUnitType) {
    case CSS_PX :
      if (mType != CSS_PX)
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      *aReturn = nsPresContext::AppUnitsToFloatCSSPixels(mValue.mAppUnits);
      break;
    case CSS_CM :
      if (mType != CSS_PX)
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      *aReturn = mValue.mAppUnits * 2.54f / float(mAppUnitsPerInch);
      break;
    case CSS_MM :
      if (mType != CSS_PX)
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      *aReturn = mValue.mAppUnits * 25.4f / float(mAppUnitsPerInch);
      break;
    case CSS_IN :
      if (mType != CSS_PX)
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      *aReturn = mValue.mAppUnits / float(mAppUnitsPerInch);
      break;
    case CSS_PT :
      if (mType != CSS_PX)
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      *aReturn = mValue.mAppUnits * 72.0f / float(mAppUnitsPerInch);
      break;
    case CSS_PC :
      if (mType != CSS_PX)
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      *aReturn = mValue.mAppUnits * 6.0f / float(mAppUnitsPerInch);
      break;
    case CSS_PERCENTAGE :
      if (mType != CSS_PERCENTAGE)
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      *aReturn = mValue.mFloat * 100;
      break;
    case CSS_NUMBER :
      if (mType != CSS_NUMBER)
        return NS_ERROR_DOM_INVALID_ACCESS_ERR;
      *aReturn = mValue.mFloat;
      break;
    case CSS_UNKNOWN :
    case CSS_EMS :
    case CSS_EXS :
    case CSS_DEG :
    case CSS_RAD :
    case CSS_GRAD :
    case CSS_MS :
    case CSS_S :
    case CSS_HZ :
    case CSS_KHZ :
    case CSS_DIMENSION :
    case CSS_STRING :
    case CSS_URI :
    case CSS_IDENT :
    case CSS_ATTR :
    case CSS_COUNTER :
    case CSS_RECT :
    case CSS_RGBCOLOR :
      return NS_ERROR_DOM_INVALID_ACCESS_ERR;
  }

  return NS_OK;
}


NS_IMETHODIMP
nsROCSSPrimitiveValue::SetStringValue(PRUint16 aStringType,
                                      const nsAString& aStringValue)
{
  return NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR;
}


NS_IMETHODIMP
nsROCSSPrimitiveValue::GetStringValue(nsAString& aReturn)
{
  switch (mType) {
    case CSS_IDENT:
      mValue.mAtom->ToString(aReturn);
      break;
    case CSS_STRING:
      aReturn.Assign(mValue.mString);
      break;
    case CSS_URI: {
      nsCAutoString spec;
      if (mValue.mURI)
        mValue.mURI->GetSpec(spec);
      CopyUTF8toUTF16(spec, aReturn);
      } break;
    case CSS_ATTR:
    default:
      aReturn.Truncate();
      return NS_ERROR_DOM_INVALID_ACCESS_ERR;
  }
  return NS_OK;
}


NS_IMETHODIMP
nsROCSSPrimitiveValue::GetCounterValue(nsIDOMCounter** aReturn)
{
  return NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR;
}


NS_IMETHODIMP
nsROCSSPrimitiveValue::GetRectValue(nsIDOMRect** aReturn)
{
  if (mType != CSS_RECT) {
    *aReturn = nsnull;
    return NS_ERROR_DOM_INVALID_ACCESS_ERR;
  }
  NS_ASSERTION(mValue.mRect, "mValue.mRect should never be null");
  return CallQueryInterface(mValue.mRect, aReturn);
}


NS_IMETHODIMP 
nsROCSSPrimitiveValue::GetRGBColorValue(nsIDOMRGBColor** aReturn)
{
  if (mType != CSS_RGBCOLOR) {
    *aReturn = nsnull;
    return NS_ERROR_DOM_INVALID_ACCESS_ERR;
  }
  NS_ASSERTION(mValue.mColor, "mValue.mColor should never be null");
  return CallQueryInterface(mValue.mColor, aReturn);
}