void VTTCue::setPosition(const DoubleOrAutoKeyword& position, ExceptionState& exceptionState)
{
// http://dev.w3.org/html5/webvtt/#dfn-vttcue-position
// On setting, if the new value is negative or greater than 100, then an
// IndexSizeError exception must be thrown. Otherwise, the WebVTT cue
// position must be set to the new value; if the new value is the string
// "auto", then it must be interpreted as the special value auto.
float floatPosition;
if (position.isAutoKeyword()) {
if (textPositionIsAuto())
return;
floatPosition = std::numeric_limits<float>::quiet_NaN();
} else {
ASSERT(position.isDouble());
if (isInvalidPercentage(position.getAsDouble(), exceptionState))
return;
floatPosition = narrowPrecisionToFloat(position.getAsDouble());
if (m_textPosition == floatPosition)
return;
}
cueWillChange();
m_textPosition = floatPosition;
cueDidChange();
}
static bool isInvalidPercentage(double value, ExceptionState& exceptionState)
{
if (isInvalidPercentage(value)) {
exceptionState.throwDOMException(IndexSizeError, ExceptionMessages::indexOutsideRange<double>("value", value, 0, ExceptionMessages::InclusiveBound, 100, ExceptionMessages::InclusiveBound));
return true;
}
return false;
}
void VTTCue::setSize(int size, ExceptionState& exceptionState)
{
// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#dom-texttrackcue-size
// On setting, if the new value is negative or greater than 100, then throw an IndexSizeError
// exception. Otherwise, set the text track cue size to the new value.
if (isInvalidPercentage(size, exceptionState))
return;
// Otherwise, set the text track cue line position to the new value.
if (m_cueSize == size)
return;
cueWillChange();
m_cueSize = size;
cueDidChange();
}
void VTTCue::setPosition(int position, ExceptionState& exceptionState)
{
// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#dom-texttrackcue-position
// On setting, if the new value is negative or greater than 100, then throw an IndexSizeError exception.
// Otherwise, set the text track cue text position to the new value.
if (isInvalidPercentage(position, exceptionState))
return;
// Otherwise, set the text track cue line position to the new value.
if (m_textPosition == position)
return;
cueWillChange();
m_textPosition = position;
cueDidChange();
}
void VTTCue::setSize(double size, ExceptionState& exceptionState)
{
// http://dev.w3.org/html5/webvtt/#dfn-vttcue-size
// On setting, if the new value is negative or greater than 100, then throw
// an IndexSizeError exception.
if (isInvalidPercentage(size, exceptionState))
return;
// Otherwise, set the WebVTT cue size to the new value.
float floatSize = narrowPrecisionToFloat(size);
if (m_cueSize == floatSize)
return;
cueWillChange();
m_cueSize = floatSize;
cueDidChange();
}
float VTTCue::calculateComputedLinePosition() const
{
// http://dev.w3.org/html5/webvtt/#dfn-text-track-cue-computed-line-position
// A text track cue has a text track cue computed line position whose value
// is that returned by the following algorithm, which is defined in terms
// of the other aspects of the cue:
// 1. If the text track cue line position is numeric, the text track cue
// snap-to-lines flag of the text track cue is not set, and the text
// track cue line position is negative or greater than 100, then return
// 100 and abort these steps.
if (!lineIsAuto() && !m_snapToLines && isInvalidPercentage(m_linePosition))
return 100;
// 2. If the text track cue line position is numeric, return the value of
// the text track cue line position and abort these steps. (Either the
// text track cue snap-to-lines flag is set, so any value, not just
// those in the range 0..100, is valid, or the value is in the range
// 0..100 and is thus valid regardless of the value of that flag.)
if (!lineIsAuto())
return m_linePosition;
// 3. If the text track cue snap-to-lines flag of the text track cue is not
// set, return the value 100 and abort these steps. (The text track cue
// line position is the special value auto.)
if (!m_snapToLines)
return 100;
// 4. Let cue be the text track cue.
// 5. If cue is not in a list of cues of a text track, or if that text
// track is not in the list of text tracks of a media element, return -1
// and abort these steps.
if (!track())
return -1;
// 6. Let track be the text track whose list of cues the cue is in.
// 7. Let n be the number of text tracks whose text track mode is showing
// and that are in the media element's list of text tracks before track.
int n = track()->trackIndexRelativeToRenderedTracks();
// 8. Increment n by one. / 9. Negate n. / 10. Return n.
n++;
n = -n;
return n;
}
static bool scanPercentage(VTTScanner& input, float& number)
{
// http://dev.w3.org/html5/webvtt/#dfn-parse-a-percentage-string
// 1. Let input be the string being parsed.
// 2. If input contains any characters other than U+0025 PERCENT SIGN
// characters (%), U+002E DOT characters (.) and ASCII digits, then
// fail.
// 3. If input does not contain at least one ASCII digit, then fail.
// 4. If input contains more than one U+002E DOT character (.), then fail.
// 5. If any character in input other than the last character is a U+0025
// PERCENT SIGN character (%), then fail.
// 6. If the last character in input is not a U+0025 PERCENT SIGN character
// (%), then fail.
// 7. Ignoring the trailing percent sign, interpret input as a real
// number. Let that number be the percentage.
// 8. If percentage is outside the range 0..100, then fail.
// 9. Return percentage.
return input.scanPercentage(number) && !isInvalidPercentage(number);
}
