tryParse static method

Implementation

static CSSCalcValue? tryParse(RenderStyle renderStyle, String propertyName, String propertyValue) {
  // calc()
  if (CSSFunction.isFunction(propertyValue, functionName: CALC)) {
    final List<CSSFunctionalNotation> fns = CSSFunction.parseFunction(propertyValue);
    if (fns.isNotEmpty && fns.first.args.isNotEmpty) {
      assert(fns.first.args.length == 1, 'Calc parameters count must be = 1');
      final expression = fns.first.args.first;
      final _CSSCalcParser parser = _CSSCalcParser(propertyName, renderStyle, expression);
      final CalcExpressionNode? node = parser.processCalcExpression();
      return CSSCalcValue(node);
    }
  }

  // clamp(min, preferred, max)
  if (CSSFunction.isFunction(propertyValue, functionName: 'clamp')) {
    final List<CSSFunctionalNotation> fns = CSSFunction.parseFunction(propertyValue);
    if (fns.isNotEmpty) {
      final CSSFunctionalNotation fn = fns.first;
      // Gracefully ignore invalid arity; leave parsing to other paths.
      if (fn.args.length == 3) {
        final CSSLengthValue minV = CSSLength.parseLength(fn.args[0].trim(), renderStyle, '${propertyName}_min');
        final CSSLengthValue prefV = CSSLength.parseLength(fn.args[1].trim(), renderStyle, '${propertyName}_pref');
        final CSSLengthValue maxV = CSSLength.parseLength(fn.args[2].trim(), renderStyle, '${propertyName}_max');
        return CSSCalcValue(_ClampExpressionNode(minV, prefV, maxV));
      }
    }
  }
  return null;
}