build method
Implementation
FormData build(String content) {
var root = formParserService.parse(content);
var formElementMap = {
for (var x in getFormElementIterator<FormElement>(root as FormElement)
.where((e) => e.id != null))
x.id!: x
};
var parser = ExpressionParser(
formElementMap,
expressionFactories: expressionFactories,
);
_buildStringExpressions(root, parser);
return _build(root, formElementMap);
}