Esempio n. 1
0
void TextTrackCue::setVertical(const String& value, ExceptionCode& ec)
{
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#dom-texttrackcue-vertical
    // On setting, the text track cue writing direction must be set to the value given 
    // in the first cell of the row in the table above whose second cell is a 
    // case-sensitive match for the new value, if any. If none of the values match, then
    // the user agent must instead throw a SyntaxError exception.
    
    WritingDirection direction = m_writingDirection;
    if (value == horizontalKeyword())
        direction = Horizontal;
    else if (value == verticalGrowingLeftKeyword())
        direction = VerticalGrowingLeft;
    else if (value == verticalGrowingRightKeyword())
        direction = VerticalGrowingRight;
    else
        ec = SYNTAX_ERR;
    
    if (direction == m_writingDirection)
        return;

    cueWillChange();
    m_writingDirection = direction;
    cueDidChange();
}
Esempio n. 2
0
void VTTCue::setVertical(const String& value, ExceptionState& exceptionState)
{
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#dom-texttrackcue-vertical
    // On setting, the text track cue writing direction must be set to the value given
    // in the first cell of the row in the table above whose second cell is a
    // case-sensitive match for the new value, if any. If none of the values match, then
    // the user agent must instead throw a SyntaxError exception.

    WritingDirection direction = m_writingDirection;
    if (value == horizontalKeyword())
        direction = Horizontal;
    else if (value == verticalGrowingLeftKeyword())
        direction = VerticalGrowingLeft;
    else if (value == verticalGrowingRightKeyword())
        direction = VerticalGrowingRight;
    else
        exceptionState.throwDOMException(SyntaxError, ExceptionMessages::failedToSet("vertical", "TextTrackCue", "The value provided ('" + value + "') is invalid. Only 'rl', 'lr', and the empty string are accepted."));

    if (direction == m_writingDirection)
        return;

    cueWillChange();
    m_writingDirection = direction;
    cueDidChange();
}
Esempio n. 3
0
const String& VTTCue::vertical() const
{
    switch (m_writingDirection) {
    case Horizontal:
        return horizontalKeyword();
    case VerticalGrowingLeft:
        return verticalGrowingLeftKeyword();
    case VerticalGrowingRight:
        return verticalGrowingRightKeyword();
    default:
        ASSERT_NOT_REACHED();
        return emptyString();
    }
}
Esempio n. 4
0
void VTTCue::setVertical(const String& value)
{
    WritingDirection direction = m_writingDirection;
    if (value == horizontalKeyword())
        direction = Horizontal;
    else if (value == verticalGrowingLeftKeyword())
        direction = VerticalGrowingLeft;
    else if (value == verticalGrowingRightKeyword())
        direction = VerticalGrowingRight;
    else
        ASSERT_NOT_REACHED();

    if (direction == m_writingDirection)
        return;

    cueWillChange();
    m_writingDirection = direction;
    cueDidChange();
}
Esempio n. 5
0
void VTTCue::parseSettings(const String& inputString)
{
    VTTScanner input(inputString);

    while (!input.isAtEnd()) {

        // The WebVTT cue settings part of a WebVTT cue consists of zero or more of the following components, in any order,
        // separated from each other by one or more U+0020 SPACE characters or U+0009 CHARACTER TABULATION (tab) characters.
        input.skipWhile<VTTParser::isValidSettingDelimiter>();

        if (input.isAtEnd())
            break;

        // When the user agent is to parse the WebVTT settings given by a string input for a text track cue cue,
        // the user agent must run the following steps:
        // 1. Let settings be the result of splitting input on spaces.
        // 2. For each token setting in the list settings, run the following substeps:
        //    1. If setting does not contain a U+003A COLON character (:), or if the first U+003A COLON character (:)
        //       in setting is either the first or last character of setting, then jump to the step labeled next setting.
        //    2. Let name be the leading substring of setting up to and excluding the first U+003A COLON character (:) in that string.
        CueSetting name = settingName(input);

        // 3. Let value be the trailing substring of setting starting from the character immediately after the first U+003A COLON character (:) in that string.
        VTTScanner::Run valueRun = input.collectUntil<VTTParser::isValidSettingDelimiter>();

        // 4. Run the appropriate substeps that apply for the value of name, as follows:
        switch (name) {
        case Vertical: {
            // If name is a case-sensitive match for "vertical"
            // 1. If value is a case-sensitive match for the string "rl", then let cue's text track cue writing direction
            //    be vertical growing left.
            if (input.scanRun(valueRun, verticalGrowingLeftKeyword()))
                m_writingDirection = VerticalGrowingLeft;

            // 2. Otherwise, if value is a case-sensitive match for the string "lr", then let cue's text track cue writing
            //    direction be vertical growing right.
            else if (input.scanRun(valueRun, verticalGrowingRightKeyword()))
                m_writingDirection = VerticalGrowingRight;
            break;
        }
        case Line: {
            // 1-2 - Collect chars that are either '-', '%', or a digit.
            // 1. If value contains any characters other than U+002D HYPHEN-MINUS characters (-), U+0025 PERCENT SIGN
            //    characters (%), and characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), then jump
            //    to the step labeled next setting.
            bool isNegative = input.scan('-');
            int linePosition;
            unsigned numDigits = input.scanDigits(linePosition);
            bool isPercentage = input.scan('%');

            if (!input.isAt(valueRun.end()))
                break;

            // 2. If value does not contain at least one character in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT
            //    NINE (9), then jump to the step labeled next setting.
            // 3. If any character in value other than the first character is a U+002D HYPHEN-MINUS character (-), then
            //    jump to the step labeled next setting.
            // 4. If any character in value other than the last character is a U+0025 PERCENT SIGN character (%), then
            //    jump to the step labeled next setting.

            // 5. If the first character in value is a U+002D HYPHEN-MINUS character (-) and the last character in value is a
            //    U+0025 PERCENT SIGN character (%), then jump to the step labeled next setting.
            if (!numDigits || (isPercentage && isNegative))
                break;

            // 6. Ignoring the trailing percent sign, if any, interpret value as a (potentially signed) integer, and
            //    let number be that number.
            // 7. If the last character in value is a U+0025 PERCENT SIGN character (%), but number is not in the range
            //    0 ≤ number ≤ 100, then jump to the step labeled next setting.
            // 8. Let cue's text track cue line position be number.
            // 9. If the last character in value is a U+0025 PERCENT SIGN character (%), then let cue's text track cue
            //    snap-to-lines flag be false. Otherwise, let it be true.
            if (isPercentage) {
                if (linePosition < 0 || linePosition > 100)
                    break;
                // 10 - If '%' then set snap-to-lines flag to false.
                m_snapToLines = false;
            } else {
                if (isNegative)
                    linePosition = -linePosition;
                m_snapToLines = true;
            }
            m_linePosition = linePosition;
            break;
        }
        case Position: {
            int number;
            // Steps 1 - 6.
            if (!scanPercentage(input, valueRun, number))
                break;

            // 7. Let cue's text track cue text position be number.
            m_textPosition = number;
            break;
        }
        case Size: {
            int number;
            // Steps 1 - 6.
            if (!scanPercentage(input, valueRun, number))
                break;

            // 7. Let cue's text track cue size be number.
            m_cueSize = number;
            break;
        }
        case Align: {
            // 1. If value is a case-sensitive match for the string "start", then let cue's text track cue alignment be start alignment.
            if (input.scanRun(valueRun, startKeyword()))
                m_cueAlignment = Start;

            // 2. If value is a case-sensitive match for the string "middle", then let cue's text track cue alignment be middle alignment.
            else if (input.scanRun(valueRun, middleKeyword()))
                m_cueAlignment = Middle;

            // 3. If value is a case-sensitive match for the string "end", then let cue's text track cue alignment be end alignment.
            else if (input.scanRun(valueRun, endKeyword()))
                m_cueAlignment = End;

            // 4. If value is a case-sensitive match for the string "left", then let cue's text track cue alignment be left alignment.
            else if (input.scanRun(valueRun, leftKeyword()))
                m_cueAlignment = Left;

            // 5. If value is a case-sensitive match for the string "right", then let cue's text track cue alignment be right alignment.
            else if (input.scanRun(valueRun, rightKeyword()))
                m_cueAlignment = Right;
            break;
        }
        case RegionId:
            m_regionId = input.extractString(valueRun);
            break;
        case None:
            break;
        }

        // Make sure the entire run is consumed.
        input.skipRun(valueRun);
    }

    // If cue's line position is not auto or cue's size is not 100 or cue's
    // writing direction is not horizontal, but cue's region identifier is not
    // the empty string, let cue's region identifier be the empty string.
    if (m_regionId.isEmpty())
        return;

    if (m_linePosition != undefinedPosition || m_cueSize != 100 || m_writingDirection != Horizontal)
        m_regionId = emptyString();
}
Esempio n. 6
0
void TextTrackCue::setCueSettings(const String& input)
{
    m_settings = input;
    unsigned position = 0;

    while (position < input.length()) {

        // The WebVTT cue settings part of a WebVTT cue consists of zero or more of the following components, in any order, 
        // separated from each other by one or more U+0020 SPACE characters or U+0009 CHARACTER TABULATION (tab) characters. 
        while (position < input.length() && WebVTTParser::isValidSettingDelimiter(input[position]))
            position++;
        if (position >= input.length())
            break;

        // When the user agent is to parse the WebVTT settings given by a string input for a text track cue cue, 
        // the user agent must run the following steps:
        // 1. Let settings be the result of splitting input on spaces.
        // 2. For each token setting in the list settings, run the following substeps:
        //    1. If setting does not contain a U+003A COLON character (:), or if the first U+003A COLON character (:) 
        //       in setting is either the first or last character of setting, then jump to the step labeled next setting.
        unsigned endOfSetting = position;
        String setting = WebVTTParser::collectWord(input, &endOfSetting);
        CueSetting name;
        size_t colonOffset = setting.find(':', 1);
        if (colonOffset == notFound || colonOffset == 0 || colonOffset == setting.length() - 1)
            goto NextSetting;

        // 2. Let name be the leading substring of setting up to and excluding the first U+003A COLON character (:) in that string.
        name = settingName(setting.substring(0, colonOffset));

        // 3. Let value be the trailing substring of setting starting from the character immediately after the first U+003A COLON character (:) in that string.
        position += colonOffset + 1;
        if (position >= input.length())
            break;

        // 4. Run the appropriate substeps that apply for the value of name, as follows:
        switch (name) {
        case Vertical:
            {
            // If name is a case-sensitive match for "vertical"
            // 1. If value is a case-sensitive match for the string "rl", then let cue's text track cue writing direction 
            //    be vertical growing left.
            String writingDirection = WebVTTParser::collectWord(input, &position);
            if (writingDirection == verticalGrowingLeftKeyword())
                m_writingDirection = VerticalGrowingLeft;
            
            // 2. Otherwise, if value is a case-sensitive match for the string "lr", then let cue's text track cue writing 
            //    direction be vertical growing right.
            else if (writingDirection == verticalGrowingRightKeyword())
                m_writingDirection = VerticalGrowingRight;
            }
            break;
        case Line:
            {
            // 1-2 - Collect chars that are either '-', '%', or a digit.
            // 1. If value contains any characters other than U+002D HYPHEN-MINUS characters (-), U+0025 PERCENT SIGN 
            //    characters (%), and characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), then jump
            //    to the step labeled next setting.
            StringBuilder linePositionBuilder;
            while (position < input.length() && (input[position] == '-' || input[position] == '%' || isASCIIDigit(input[position])))
                linePositionBuilder.append(input[position++]);
            if (position < input.length() && !WebVTTParser::isValidSettingDelimiter(input[position]))
                break;

            // 2. If value does not contain at least one character in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT 
            //    NINE (9), then jump to the step labeled next setting.
            // 3. If any character in value other than the first character is a U+002D HYPHEN-MINUS character (-), then 
            //    jump to the step labeled next setting.
            // 4. If any character in value other than the last character is a U+0025 PERCENT SIGN character (%), then
            //    jump to the step labeled next setting.
            String linePosition = linePositionBuilder.toString();
            if (linePosition.find('-', 1) != notFound || linePosition.reverseFind("%", linePosition.length() - 2) != notFound)
                break;

            // 5. If the first character in value is a U+002D HYPHEN-MINUS character (-) and the last character in value is a 
            //    U+0025 PERCENT SIGN character (%), then jump to the step labeled next setting.
            if (linePosition[0] == '-' && linePosition[linePosition.length() - 1] == '%')
                break;

            // 6. Ignoring the trailing percent sign, if any, interpret value as a (potentially signed) integer, and 
            //    let number be that number. 
            // NOTE: toInt ignores trailing non-digit characters, such as '%'.
            bool validNumber;
            int number = linePosition.toInt(&validNumber);
            if (!validNumber)
                break;

            // 7. If the last character in value is a U+0025 PERCENT SIGN character (%), but number is not in the range 
            //    0 ≤ number ≤ 100, then jump to the step labeled next setting.
            // 8. Let cue's text track cue line position be number.
            // 9. If the last character in value is a U+0025 PERCENT SIGN character (%), then let cue's text track cue 
            //    snap-to-lines flag be false. Otherwise, let it be true.
            if (linePosition[linePosition.length() - 1] == '%') {
                if (number < 0 || number > 100)
                    break;

                // 10 - If '%' then set snap-to-lines flag to false.
                m_snapToLines = false;
            }

            m_linePosition = number;
            }
            break;
        case Position:
            {
            // 1. If value contains any characters other than U+0025 PERCENT SIGN characters (%) and characters in the range 
            //    U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), then jump to the step labeled next setting.
            // 2. If value does not contain at least one character in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9),
            //    then jump to the step labeled next setting.
            String textPosition = WebVTTParser::collectDigits(input, &position);
            if (textPosition.isEmpty())
                break;
            if (position >= input.length())
                break;

            // 3. If any character in value other than the last character is a U+0025 PERCENT SIGN character (%), then jump
            //    to the step labeled next setting.
            // 4. If the last character in value is not a U+0025 PERCENT SIGN character (%), then jump to the step labeled
            //    next setting.
            if (input[position++] != '%')
                break;
            if (position < input.length() && !WebVTTParser::isValidSettingDelimiter(input[position]))
                break;

            // 5. Ignoring the trailing percent sign, interpret value as an integer, and let number be that number.
            // 6. If number is not in the range 0 ≤ number ≤ 100, then jump to the step labeled next setting.
            // NOTE: toInt ignores trailing non-digit characters, such as '%'.
            bool validNumber;
            int number = textPosition.toInt(&validNumber);
            if (!validNumber)
                break;
            if (number < 0 || number > 100)
              break;

            // 7. Let cue's text track cue text position be number.
            m_textPosition = number;
            }
            break;
        case Size:
            {
            // 1. If value contains any characters other than U+0025 PERCENT SIGN characters (%) and characters in the
            //    range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9), then jump to the step labeled next setting.
            // 2. If value does not contain at least one character in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT 
            //    NINE (9), then jump to the step labeled next setting.
            String cueSize = WebVTTParser::collectDigits(input, &position);
            if (cueSize.isEmpty())
                break;
            if (position >= input.length())
                break;

            // 3. If any character in value other than the last character is a U+0025 PERCENT SIGN character (%),
            //    then jump to the step labeled next setting.
            // 4. If the last character in value is not a U+0025 PERCENT SIGN character (%), then jump to the step
            //    labeled next setting.
            if (input[position++] != '%')
                break;
            if (position < input.length() && !WebVTTParser::isValidSettingDelimiter(input[position]))
                break;

            // 5. Ignoring the trailing percent sign, interpret value as an integer, and let number be that number.
            // 6. If number is not in the range 0 ≤ number ≤ 100, then jump to the step labeled next setting.
            bool validNumber;
            int number = cueSize.toInt(&validNumber);
            if (!validNumber)
                break;
            if (number < 0 || number > 100)
                break;

            // 7. Let cue's text track cue size be number.
            m_cueSize = number;
            }
            break;
        case Align:
            {
            String cueAlignment = WebVTTParser::collectWord(input, &position);

            // 1. If value is a case-sensitive match for the string "start", then let cue's text track cue alignment be start alignment.
            if (cueAlignment == startKeyword())
                m_cueAlignment = Start;

            // 2. If value is a case-sensitive match for the string "middle", then let cue's text track cue alignment be middle alignment.
            else if (cueAlignment == middleKeyword())
                m_cueAlignment = Middle;

            // 3. If value is a case-sensitive match for the string "end", then let cue's text track cue alignment be end alignment.
            else if (cueAlignment == endKeyword())
                m_cueAlignment = End;
            }
            break;
#if ENABLE(WEBVTT_REGIONS)
        case RegionId:
            m_regionId = WebVTTParser::collectWord(input, &position);
            break;
#endif
        case None:
            break;
        }

NextSetting:
        position = endOfSetting;
    }
#if ENABLE(WEBVTT_REGIONS)
    // If cue's line position is not auto or cue's size is not 100 or cue's
    // writing direction is not horizontal, but cue's region identifier is not
    // the empty string, let cue's region identifier be the empty string.
    if (m_regionId.isEmpty())
        return;

    if (m_linePosition != undefinedPosition || m_cueSize != 100 || m_writingDirection != Horizontal)
        m_regionId = emptyString();
#endif
}
Esempio n. 7
0
void VTTCue::parseSettings(const String& inputString)
{
    VTTScanner input(inputString);

    while (!input.isAtEnd()) {

        // The WebVTT cue settings part of a WebVTT cue consists of zero or more of the following components, in any order,
        // separated from each other by one or more U+0020 SPACE characters or U+0009 CHARACTER TABULATION (tab) characters.
        input.skipWhile<VTTParser::isValidSettingDelimiter>();

        if (input.isAtEnd())
            break;

        // When the user agent is to parse the WebVTT settings given by a string input for a text track cue cue,
        // the user agent must run the following steps:
        // 1. Let settings be the result of splitting input on spaces.
        // 2. For each token setting in the list settings, run the following substeps:
        //    1. If setting does not contain a U+003A COLON character (:), or if the first U+003A COLON character (:)
        //       in setting is either the first or last character of setting, then jump to the step labeled next setting.
        //    2. Let name be the leading substring of setting up to and excluding the first U+003A COLON character (:) in that string.
        CueSetting name = settingName(input);

        // 3. Let value be the trailing substring of setting starting from the character immediately after the first U+003A COLON character (:) in that string.
        VTTScanner::Run valueRun = input.collectUntil<VTTParser::isValidSettingDelimiter>();

        // 4. Run the appropriate substeps that apply for the value of name, as follows:
        switch (name) {
        case Vertical: {
            // If name is a case-sensitive match for "vertical"
            // 1. If value is a case-sensitive match for the string "rl", then
            //    let cue's WebVTT cue writing direction be vertical
            //    growing left.
            if (input.scanRun(valueRun, verticalGrowingLeftKeyword()))
                m_writingDirection = VerticalGrowingLeft;

            // 2. Otherwise, if value is a case-sensitive match for the string
            //    "lr", then let cue's WebVTT cue writing direction be
            //    vertical growing right.
            else if (input.scanRun(valueRun, verticalGrowingRightKeyword()))
                m_writingDirection = VerticalGrowingRight;
            break;
        }
        case Line: {
            // If name is a case-sensitive match for "line"
            // Steps 1 - 2 skipped.
            float number;
            // 3. If linepos does not contain at least one ASCII digit, then
            //    jump to the step labeled next setting.
            // 4. If the last character in linepos is a U+0025 PERCENT SIGN character (%)
            //
            //    If parse a percentage string from linepos doesn't fail, let
            //    number be the returned percentage, otherwise jump to the step
            //    labeled next setting.
            bool isPercentage = scanPercentage(input, number);
            if (!isPercentage) {
                // Otherwise
                //
                // 1. If linepos contains any characters other than U+002D
                //    HYPHEN-MINUS characters (-) and ASCII digits, then jump to
                //    the step labeled next setting.
                // 2. If any character in linepos other than the first character is
                //    a U+002D HYPHEN-MINUS character (-), then jump to the step
                //    labeled next setting.
                bool isNegative = input.scan('-');
                int intLinePosition;
                if (!input.scanDigits(intLinePosition))
                    break;
                // 3. Interpret linepos as a (potentially signed) integer, and let
                //    number be that number.
                number = isNegative ? -intLinePosition : intLinePosition;
            }
            if (!input.isAt(valueRun.end()))
                break;
            // 5. Let cue's WebVTT cue line be number.
            m_linePosition = number;
            // 6. If the last character in linepos is a U+0025 PERCENT SIGN
            //    character (%), then let cue's WebVTT cue snap-to-lines
            //    flag be false. Otherwise, let it be true.
            m_snapToLines = !isPercentage;
            // Steps 7 - 9 skipped.
            break;
        }
        case Position: {
            // If name is a case-sensitive match for "position".
            float number;
            // Steps 1 - 2 skipped.
            // 3. If parse a percentage string from colpos doesn't fail, let
            //    number be the returned percentage, otherwise jump to the step
            //    labeled next setting (text track cue text position's value
            //    remains the special value auto).
            if (!scanPercentage(input, number))
                break;
            if (!input.isAt(valueRun.end()))
                break;
            // 4. Let cue's cue position be number.
            m_textPosition = number;
            // Steps 5 - 7 skipped.
            break;
        }
        case Size: {
            // If name is a case-sensitive match for "size"
            float number;
            // 1. If parse a percentage string from value doesn't fail, let
            //    number be the returned percentage, otherwise jump to the step
            //    labeled next setting.
            if (!scanPercentage(input, number))
                break;
            if (!input.isAt(valueRun.end()))
                break;
            // 2. Let cue's WebVTT cue size be number.
            m_cueSize = number;
            break;
        }
        case Align: {
            // If name is a case-sensitive match for "align"
            // 1. If value is a case-sensitive match for the string "start",
            //    then let cue's WebVTT cue text alignment be start alignment.
            if (input.scanRun(valueRun, startKeyword()))
                m_cueAlignment = Start;

            // 2. If value is a case-sensitive match for the string "middle",
            //    then let cue's WebVTT cue text alignment be middle alignment.
            else if (input.scanRun(valueRun, middleKeyword()))
                m_cueAlignment = Middle;

            // 3. If value is a case-sensitive match for the string "end", then
            //    let cue's WebVTT cue text alignment be end alignment.
            else if (input.scanRun(valueRun, endKeyword()))
                m_cueAlignment = End;

            // 4. If value is a case-sensitive match for the string "left",
            //    then let cue's WebVTT cue text alignment be left alignment.
            else if (input.scanRun(valueRun, leftKeyword()))
                m_cueAlignment = Left;

            // 5. If value is a case-sensitive match for the string "right",
            //    then let cue's WebVTT cue text alignment be right alignment.
            else if (input.scanRun(valueRun, rightKeyword()))
                m_cueAlignment = Right;
            break;
        }
        case RegionId:
            m_regionId = input.extractString(valueRun);
            break;
        case None:
            break;
        }

        // Make sure the entire run is consumed.
        input.skipRun(valueRun);
    }

    // If cue's line position is not auto or cue's size is not 100 or cue's
    // writing direction is not horizontal, but cue's region identifier is not
    // the empty string, let cue's region identifier be the empty string.
    if (m_regionId.isEmpty())
        return;

    if (!lineIsAuto() || m_cueSize != 100 || m_writingDirection != Horizontal)
        m_regionId = emptyString();
}