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| 1 | namespace Syntax.Parsers.Definitions is | |
| 2 | use Source | |
| 3 | ||
| 4 | // impl <Interface> for <Target>[<params>] is <members> si | |
| 5 | // Injects an interface implementation into an already-declared type. The | |
| 6 | // interface's type parameters are the target's own, so they are written on | |
| 7 | // the target (`for List[T]`), not as a separate binder. | |
| 8 | class IMPL( | |
| 9 | identifier_qualified_parser: Parser[Trees.Identifiers.Identifier], | |
| 10 | type_parser: Parser[Trees.TypeExpressions.TypeExpression], | |
| 11 | type_list_parser: Parser[Trees.TypeExpressions.LIST], | |
| 12 | modifier_list_parser: Parser[Trees.Modifiers.LIST], | |
| 13 | definition_list_parser: Parser[Trees.Definitions.LIST] | |
| 14 | ): Base[Trees.Definitions.IMPL] is | |
| 15 | super() | |
| 16 | ||
| 17 | parse(context: CONTEXT) -> Trees.Definitions.IMPL? is | |
| 18 | let start = context.location | |
| 19 | context.in_classy = true | |
| 20 | context.global_indent = start.start_column | |
| 21 | ||
| 22 | try | |
| 23 | context.next_token(Lexical.TOKEN.IMPL) | |
| 24 | ||
| 25 | let interface = type_parser.parse(context) | |
| 26 | ||
| 27 | if interface == null then | |
| 28 | return null | |
| 29 | fi | |
| 30 | ||
| 31 | let is_poisoned mut = interface.is_poisoned | |
| 32 | ||
| 33 | is_poisoned = !context.next_token(Lexical.TOKEN.FOR) \/ is_poisoned | |
| 34 | ||
| 35 | let identifier = identifier_qualified_parser.parse(context) | |
| 36 | ||
| 37 | if !identifier? then | |
| 38 | return null | |
| 39 | fi | |
| 40 | ||
| 41 | let arguments: Trees.TypeExpressions.LIST? mut = null | |
| 42 | ||
| 43 | if context.current.token == Lexical.TOKEN.SQUARE_OPEN then | |
| 44 | context.next_token() | |
| 45 | ||
| 46 | context.in_type_parameters = true | |
| 47 | context.in_generic_parameter_list = true | |
| 48 | arguments = type_list_parser.parse(context)! | |
| 49 | context.in_type_parameters = false | |
| 50 | context.in_generic_parameter_list = false | |
| 51 | arguments.check_no_reference_types(context.logger) | |
| 52 | ||
| 53 | is_poisoned = arguments.is_poisoned \/ is_poisoned | |
| 54 | ||
| 55 | if | |
| 56 | !arguments.is_poisoned \/ | |
| 57 | context.current.token == Lexical.TOKEN.SQUARE_CLOSE | |
| 58 | then | |
| 59 | is_poisoned = !context.next_token(Lexical.TOKEN.SQUARE_CLOSE) \/ is_poisoned | |
| 60 | fi | |
| 61 | fi | |
| 62 | ||
| 63 | let ancestors = | |
| 64 | Trees.TypeExpressions.LIST( | |
| 65 | interface.location, | |
| 66 | [interface] | |
| 67 | ) | |
| 68 | ||
| 69 | let modifiers = modifier_list_parser.parse(context)! | |
| 70 | ||
| 71 | let expect_body = !is_poisoned \/ context.current.token == Lexical.TOKEN.IS | |
| 72 | let have_body mut = false | |
| 73 | ||
| 74 | let body: Trees.Definitions.LIST mut | |
| 75 | ||
| 76 | if expect_body /\ context.next_token(Lexical.TOKEN.IS) then | |
| 77 | let use open = context.open_construct(Lexical.TOKEN.SI) | |
| 78 | ||
| 79 | body = definition_list_parser.parse(context)! | |
| 80 | have_body = true | |
| 81 | else | |
| 82 | body = Trees.Definitions.LIST(LOCATION.internal, Collections.LIST[Trees.Definitions.Definition](0)) | |
| 83 | is_poisoned = true | |
| 84 | fi | |
| 85 | ||
| 86 | let result = Trees.Definitions.IMPL( | |
| 87 | start::context.location, | |
| 88 | identifier, | |
| 89 | arguments, | |
| 90 | ancestors, | |
| 91 | modifiers, | |
| 92 | body | |
| 93 | ) | |
| 94 | ||
| 95 | result.poison(is_poisoned) | |
| 96 | ||
| 97 | if have_body then | |
| 98 | context.expect_closer(Lexical.TOKEN.SI) | |
| 99 | fi | |
| 100 | ||
| 101 | return result | |
| 102 | finally | |
| 103 | context.in_classy = false | |
| 104 | yrt | |
| 105 | si | |
| 106 | si | |
| 107 | si |