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| 1 | namespace Syntax.Trees.Expressions is | |
| 2 | ||
| 3 | use Source; | |
| 4 | ||
| 5 | class MEMBER( | |
| 6 | location: LOCATION, | |
| 7 | left: Expression, | |
| 8 | identifier: Identifiers.Identifier, | |
| 9 | completion_target: LOCATION | |
| 10 | ): Expression is | |
| 11 | right_location: LOCATION => identifier.right_location; | |
| 12 | ||
| 13 | is_member: bool => true; | |
| 14 | could_be_type_expression: bool => left.could_be_type_expression; | |
| 15 | ||
| 16 | // Set by the parser when the access was written `a?.b`: the | |
| 17 | // load short-circuits on a null receiver and yields a result | |
| 18 | // widened to the optional shape of the member type. Plain | |
| 19 | // `a.b` leaves this false. | |
| 20 | is_coalesce: bool public; | |
| 21 | ||
| 22 | // Pushed in by the parent context. Lets a bare unit-variant | |
| 23 | // member access (`let n: Option[int] = Option.NONE`) specialise | |
| 24 | // the union from the declared type; other member shapes ignore | |
| 25 | // the field. | |
| 26 | ||
| 27 | try_copy_as_identifer() -> Identifiers.Identifier? => | |
| 28 | let maybe_left_as_identifier = left.try_copy_as_identifer() in | |
| 29 | if maybe_left_as_identifier? then | |
| 30 | Trees.Identifiers.QUALIFIED( | |
| 31 | location, | |
| 32 | maybe_left_as_identifier, | |
| 33 | identifier.name, | |
| 34 | completion_target, | |
| 35 | right_location | |
| 36 | ) | |
| 37 | else | |
| 38 | return null; | |
| 39 | fi; | |
| 40 | ||
| 41 | super(location); | |
| 42 | ||
| 43 | set_expected_type(expected_type: Semantic.Types.Type?, error_message: string?) is | |
| 44 | compile_expressions_state.set_expected_type(expected_type, error_message); | |
| 45 | si | |
| 46 | ||
| 47 | accept(visitor: Visitor) is | |
| 48 | visitor.visit(self); | |
| 49 | si | |
| 50 | ||
| 51 | walk(visitor: Visitor) is | |
| 52 | if !visitor.pre(self) then | |
| 53 | left.walk(visitor); | |
| 54 | identifier.walk(visitor); | |
| 55 | fi | |
| 56 | accept(visitor); | |
| 57 | si | |
| 58 | ||
| 59 | replace_child(old: Expression, replacement: Expression) is | |
| 60 | if left == old then | |
| 61 | left = replacement; | |
| 62 | fi | |
| 63 | si | |
| 64 | si | |
| 65 | si |