=========================================
dart string literals
=========================================

get a => "";
get a => "\"";
get a => "This' is a string $mystring";
get a => '''This" is a
string ${mystring}''';
get a => 'Also a string';

---

(program
  (getter_signature (identifier)) (function_body (string_literal))
  (getter_signature (identifier)) (function_body (string_literal (escape_sequence)))
  (getter_signature (identifier)) (function_body (string_literal (template_substitution (identifier_dollar_escaped))))
   (getter_signature (identifier)) (function_body (string_literal (template_substitution (identifier))))
  (getter_signature (identifier)) (function_body (string_literal)))

=========================================
dart string literals 2
=========================================

get a => "";
get a => "\"";
get a => """This' is a string $mystring""";
get a => '''This" is a $
string mystring''';
get a => '''Also a string''';

---

(program
(getter_signature   (identifier)) (function_body (string_literal))
 (getter_signature (identifier)) (function_body (string_literal (escape_sequence)))
  (getter_signature (identifier)) (function_body (string_literal (template_substitution (identifier_dollar_escaped))))
  (getter_signature (identifier)) (function_body (string_literal))
  (getter_signature (identifier)) (function_body (string_literal)))
=========================================
dart string literals raw
=========================================

get a => "";
get a => r"\";
get a => """This' is a string $mystring""";
get a => '''This" is a $
string mystring''';
get a => r'''Also a string''';

---

(program
  (getter_signature (identifier)) (function_body  (string_literal))
  (getter_signature (identifier)) (function_body (string_literal))
  (getter_signature (identifier)) (function_body (string_literal (template_substitution (identifier_dollar_escaped))))
  (getter_signature (identifier)) (function_body (string_literal))
  (getter_signature (identifier)) (function_body (string_literal)))


==================================================
dart identifier name r (used to conflict/error with raw string literal)
==================================================

String hello(r) => 'hello';

---
(program 
  (function_signature (type_identifier) (identifier) 
    (formal_parameter_list (formal_parameter (identifier)))) (function_body (string_literal))) 

==================================================
dart set literals
==================================================

class A {
  int b() {
    var c = {vala};
    var c = {vala: 'g'};
  }
}

---

(program
  (class_definition
    name: (identifier)
    body: (class_body
      (method_signature (function_signature
        (type_identifier)
        name: (identifier)
        (formal_parameter_list)))
        (function_body (block
          (local_variable_declaration
          (initialized_variable_definition

            (inferred_type)

              name: (identifier)
              value: (set_or_map_literal (identifier))
              ))
           (local_variable_declaration
           (initialized_variable_definition

              (inferred_type)
              name: (identifier)
              value: (set_or_map_literal (pair key: (identifier) value: (string_literal)))
           )
           ))
              ))))

==================================================
embedded control flow for collections
==================================================

class A {
  int b() {
    var c = {if (z) vala};
    var c = {vala: 'g'};
  }
}

---

(program
  (class_definition
    name: (identifier)
    body: (class_body
      (method_signature (function_signature
        (type_identifier)
        name: (identifier)
        (formal_parameter_list)))
        (function_body (block
          (local_variable_declaration
          (initialized_variable_definition
                      (inferred_type)
                        name: (identifier)
                        value: (set_or_map_literal (if_element
                         (identifier)
                        consequence: (identifier)
                        ))
          )
              )
           (local_variable_declaration
           (initialized_variable_definition
                        (inferred_type)
                         name: (identifier)
                         value: (set_or_map_literal (pair key: (identifier) value: (string_literal)))
           )
              ))
              )
              )))
===================
Positional Parameters
===================

class Beyonce {
  void calculateAnswer(double wingSpan, int numberOfEngines,
                       [double length, double grossTons]) {
      //do the calculation here
  }
}

---

(program
  (class_definition
    (identifier)
    (class_body
      (method_signature (function_signature
        (void_type)
        (identifier)
        (formal_parameter_list
          (formal_parameter (type_identifier) (identifier))
          (formal_parameter (type_identifier) (identifier))
          (optional_formal_parameters
          (formal_parameter (type_identifier) (identifier))
          (formal_parameter (type_identifier) (identifier))))))
        (function_body (block (comment))))))

==================================================
collection trailing commas
==================================================

final map = {"hello": "world",};
final set = {"hello", "world"};

---

(program 
  (final_builtin)
  (static_final_declaration_list (static_final_declaration (identifier) 
    (set_or_map_literal (pair (string_literal) (string_literal))))) 
  (final_builtin)
  (static_final_declaration_list (static_final_declaration (identifier) 
    (set_or_map_literal (string_literal) (string_literal)))))

==================================================
collection literal type parameters
==================================================

final dynamic opts = <dynamic, dynamic>{
  'transports': ['websocket'],
  'forceNew': true,
};

---

(program (final_builtin) (type_identifier) (static_final_declaration_list (static_final_declaration (identifier) 
  (set_or_map_literal (type_arguments (type_identifier) (type_identifier)) (pair (string_literal) 
    (list_literal (string_literal))) (pair (string_literal) (true))))))

==================================================
extensions on integer literals
==================================================

void main() {
  await Future.delayed(10.milliseconds, () {});
}

---

(program 
  (function_signature (void_type) (identifier) (formal_parameter_list)) 
  (function_body (block (expression_statement (unary_expression 
    (await_expression (identifier) (selector (unconditional_assignable_selector (identifier))) (selector (argument_part 
    (arguments (argument (decimal_integer_literal) (selector (unconditional_assignable_selector (identifier))))
      (argument (function_expression (formal_parameter_list) (function_expression_body (block)))))))))))))


==================================================
part directive
==================================================

part 'hello.dart';

---

(program (part_directive (uri (string_literal))))

==================================================
part of directive
==================================================

part of 'hello.dart';

---

(program (part_of_directive (uri (string_literal))))

==================================================
extension methods
==================================================

extension Hello on String {
  String get hello => 'hello';
}

---

(program 
  (extension_declaration (identifier) (type_identifier) (extension_body 
    (method_signature (getter_signature (type_identifier) (identifier))) (function_body (string_literal)))))

==================================================
library directive
==================================================

library myLibrary;

---

(program (library_name (dotted_identifier_list (identifier))))

==================================================
scoped library directive
==================================================

library myLibrary.a.cool.library;

---

(program (library_name (dotted_identifier_list (identifier) (identifier) (identifier) (identifier))))


==================================================
redirecting factories
==================================================
@freezed
abstract class MyDataClass implements _$MyDataClass {
  const factory MyDataClass.initialize({@Default(false) bool debug}) =  _MyDataClassInitialize;
  factory MyDataClass.debug() => MyDataClass.initialize(debug: true);
}

---

(program 
  (class_definition 
    (marker_annotation (identifier)) 
    (abstract) (identifier) (interfaces (type_identifier)) 
    (class_body 
      (declaration (redirecting_factory_constructor_signature (const_builtin) (identifier) (identifier) (formal_parameter_list 
        (optional_formal_parameters (formal_parameter 
          (annotation (identifier) (arguments (argument (false)))) (type_identifier) (identifier)))) (type_identifier))) 
      (method_signature (factory_constructor_signature (identifier) (identifier) (formal_parameter_list))) 
        (function_body (identifier) (selector (unconditional_assignable_selector (identifier))) 
          (selector (argument_part (arguments (named_argument (label (identifier)) (true)))))))))


======================================
setter expressions
======================================

class MyClass {
  set editing(bool value) {
    _editing = value;
  }
}

---

(program (class_definition (identifier) 
  (class_body (method_signature 
    (setter_signature (identifier) 
      (formal_parameter_list (formal_parameter (type_identifier) (identifier))))) 
        (function_body (block (expression_statement (assignment_expression (assignable_expression (identifier)) (identifier))))))))


======================================
Basic selector
======================================

void main() {
  f(a.b);
}

---

 (program 
  (function_signature (void_type) (identifier) (formal_parameter_list)) 
  (function_body (block 
    (expression_statement 
      (identifier) 
        (selector (argument_part 
          (arguments 
            (argument 
              (identifier) 
              (selector (unconditional_assignable_selector (identifier)))))))))))
