Beispiel #1
0
// Used for 'position' and 'size'.
static bool scanPercentage(VTTScanner& input, const VTTScanner::Run& valueRun, int& number)
{
    // 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.
    if (!input.scanDigits(number))
        return false;

    // 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.scan('%') || !input.isAt(valueRun.end()))
        return false;

    // 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.
    return number >= 0 && number <= 100;
}
Beispiel #2
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();
}
Beispiel #3
0
static inline bool parsedEntireRun(const VTTScanner& input, const VTTScanner::Run& run)
{
    return input.isAt(run.end());
}
Beispiel #4
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();
}