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 * modification, are permitted provided that the following conditions are
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 *
 *     * Redistributions of source code must retain the above copyright
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "third_party/blink/renderer/core/svg/svg_animated_length.h"

#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/css/style_sheet_contents.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/svg/svg_element.h"
#include "third_party/blink/renderer/core/svg/svg_length.h"

namespace blink {

namespace {

bool RequireNonNegative(CSSPropertyID property_id) {
  // This should include more properties ('r', 'rx' and 'ry').
  return property_id == CSSPropertyID::kWidth ||
         property_id == CSSPropertyID::kHeight;
}

}  // namespace

SVGParsingError SVGAnimatedLength::AttributeChanged(const String& value) {
  // TODO: Use correct validator when we can set proper initial
  // values on error (for example 'auto' for 'rx' and 'ry').

  SVGParsingError parse_status = UpdateBaseValueFromAttribute(
      *BaseValue(), value,
      [](const SVGLength&) { return SVGParseStatus::kNoError; },
      ContextElement()
          ->GetDocument()
          .ElementSheet()
          .Contents()
          ->ParserContext());

  if (SVGLength::NegativeValuesForbiddenForAnimatedLengthAttribute(
          AttributeName())) {
    // TODO(crbug.com/982425): Pass |kValueRangeNonNegative| to property
    // parser to handle range checking on math functions correctly, and also
    // to avoid this ad hoc range checking.
    if (BaseValue()->IsNegativeNumericLiteral()) {
      parse_status = SVGParseStatus::kNegativeValue;
    }
  }

  return parse_status;
}

const CSSValue* SVGAnimatedLength::CssValue() const {
  DCHECK(HasPresentationAttributeMapping());
  // SVG allows negative numbers for these attributes but CSS doesn't allow
  // negative <length> values for the corresponding CSS properties. So remove
  // negative values here.
  if (RequireNonNegative(CssPropertyId())) {
    // TODO(fs): This doesn't handle calc expressions. For that, we'd probably
    // need to rewrap the CSSMathExpressionNode with a kValueRangeNonNegative
    // range specification.
    if (CurrentValue()->IsNegativeNumericLiteral()) {
      return nullptr;
    }
  }
  return &CurrentValue()->AsCSSValue();
}

void SVGAnimatedLength::Trace(Visitor* visitor) const {
  SVGAnimatedProperty<SVGLength>::Trace(visitor);
  ScriptWrappable::Trace(visitor);
}

}  // namespace blink