parseLength static method

Implementation

static CSSLengthValue parseLength(String text, RenderStyle? renderStyle, [String? propertyName, Axis? axisType]) {
  double? value;
  CSSLengthType unit = CSSLengthType.PX;
  if (text == ZERO) {
    // Only '0' is accepted with no unit.
    return CSSLengthValue.zero;
  } else if (text == INITIAL) {
    return CSSLengthValue.initial;
  } else if (text == INHERIT) {
    if (renderStyle != null && propertyName != null && renderStyle.target.parentElement != null) {
      var element = renderStyle.target.parentElement!;
      return parseLength(element.style.getPropertyValue(propertyName), element.renderStyle, propertyName, axisType);
    }
    return CSSLengthValue.zero;
  } else if (text == AUTO) {
    return CSSLengthValue.auto;
  } else if (text == NONE) {
    return CSSLengthValue.none;
  } else if (text.toLowerCase() == 'content') {
    // flex-basis: content
    return CSSLengthValue(null, CSSLengthType.CONTENT, renderStyle, propertyName, axisType);
  } else if (text.endsWith(REM)) {
    value = double.tryParse(text.split(REM)[0]);
    unit = CSSLengthType.REM;
  } else if (text.endsWith(EM)) {
    value = double.tryParse(text.split(EM)[0]);
    unit = CSSLengthType.EM;
  } else if (text.endsWith(EX)) {
    value = double.tryParse(text.split(EX)[0]);
    unit = CSSLengthType.EX;
  } else if (text.endsWith(RPX)) {
    value = double.tryParse(text.split(RPX)[0]);
    unit = CSSLengthType.RPX;
  } else if (text.endsWith(PX)) {
    value = double.tryParse(text.split(PX)[0]);
  } else if (text.endsWith(VW)) {
    value = double.tryParse(text.split(VW)[0]);
    if (value != null) value = value / 100;
    unit = CSSLengthType.VW;
  } else if (text.endsWith(VH)) {
    value = double.tryParse(text.split(VH)[0]);
    if (value != null) value = value / 100;
    unit = CSSLengthType.VH;
  } else if (text.endsWith(CM)) {
    value = double.tryParse(text.split(CM)[0]);
    if (value != null) value = value * _1cm;
  } else if (text.endsWith(MM)) {
    value = double.tryParse(text.split(MM)[0]);
    if (value != null) value = value * _1mm;
  } else if (text.endsWith(PC)) {
    value = double.tryParse(text.split(PC)[0]);
    if (value != null) value = value * _1pc;
  } else if (text.endsWith(PT)) {
    value = double.tryParse(text.split(PT)[0]);
    if (value != null) value = value * _1pt;
  } else if (text.endsWith(VMIN)) {
    value = double.tryParse(text.split(VMIN)[0]);
    if (value != null) value = value / 100;
    unit = CSSLengthType.VMIN;
  } else if (text.endsWith(VMAX)) {
    value = double.tryParse(text.split(VMAX)[0]);
    if (value != null) value = value / 100;
    unit = CSSLengthType.VMAX;
  } else if (text.endsWith(IN)) {
    value = double.tryParse(text.split(IN)[0]);
    if (value != null) value = value * _1in;
  } else if (text.endsWith(Q)) {
    value = double.tryParse(text.split(Q)[0]);
    if (value != null) value = value * _1Q;
  } else if (text.endsWith(PERCENTAGE)) {
    value = double.tryParse(text.split(PERCENTAGE)[0]);
    if (value != null) value = value / 100;
    unit = CSSLengthType.PERCENTAGE;
  } else if (CSSFunction.isFunction(text)) {
    if (renderStyle != null) {
      CSSCalcValue? calcValue = CSSCalcValue.tryParse(renderStyle, propertyName ?? '', text);
      if (calcValue != null) {
        return CSSLengthValue.calc(calcValue, renderStyle, propertyName);
      }
    }
  } else {
    value = double.tryParse(text);
  }

  if (value == 0 && unit != CSSLengthType.PERCENTAGE) {
    return CSSLengthValue.zero;
  } else if (value == null) {
    return CSSLengthValue.unknown;
  } else if (unit == CSSLengthType.PX) {
    return CSSLengthValue(value, unit);
  } else {
    return CSSLengthValue(value, unit, renderStyle, propertyName, axisType);
  }
}