execExpressionToValue method
dynamic
execExpressionToValue(
- String expressionStr
)
Implementation
dynamic execExpressionToValue(String expressionStr) {
try {
var expression = Expression.parse(expressionStr);
Map<String, dynamic> context = {
'now': () => DateTime.now(),
'isEmpty': _isEmpty,
'isNotEmpty': (value) => !_isEmpty(value),
'fd': fd,
'sum': sum,
'toString': toStringFunc,
'safeAdd': safeAdd,
'safeSub': safeSub,
'safeMul': safeMul,
'safeDiv': safeDiv
};
context.addAll(dataSource);
return evaluator.eval(expression, context);
} catch (_) {
return null;
}
}