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| 1 | namespace Syntax.Parsers.Variables is | |
| 2 | class VARIABLE( | |
| 3 | identifier_parser: Parser[Trees.Identifiers.Identifier], | |
| 4 | destructure_left_parser: Parser[Trees.Variables.DESTRUCTURING_VARIABLE_LEFT], | |
| 5 | type_parser: Parser[Trees.TypeExpressions.TypeExpression], | |
| 6 | expression_parser: Parser[Trees.Expressions.Expression], | |
| 7 | modifier_list_parser: Parser[Trees.Modifiers.LIST], | |
| 8 | pragma_parser: Parser[Trees.Pragmas.PRAGMA] | |
| 9 | ): Base[Trees.Variables.VARIABLE] is | |
| 10 | super(); | |
| 11 | ||
| 12 | parse(context: CONTEXT) -> Trees.Variables.VARIABLE? is | |
| 13 | let start = context.location; | |
| 14 | ||
| 15 | // An attribute pragma before a formal-argument parameter, e.g. | |
| 16 | // `@FromQuery() id: int`. Only recognised inside a function or | |
| 17 | // method parameter list (CONTEXT.in_formal_arguments) — a `let`, | |
| 18 | // primary-ctor header, or variant field list leaves `@` alone | |
| 19 | // for the caller's usual "unexpected token" handling. | |
| 20 | let pragmas: Collections.LIST[Trees.Pragmas.PRAGMA]? mut = _; | |
| 21 | ||
| 22 | if context.in_formal_arguments then | |
| 23 | while context.current.token == Lexical.TOKEN.AT do | |
| 24 | let pragma = pragma_parser.parse(context); | |
| 25 | ||
| 26 | if !pragma? then | |
| 27 | break; | |
| 28 | fi | |
| 29 | ||
| 30 | if !pragmas? then | |
| 31 | pragmas = Collections.LIST[Trees.Pragmas.PRAGMA](); | |
| 32 | fi | |
| 33 | ||
| 34 | pragmas.add(pragma); | |
| 35 | od | |
| 36 | fi | |
| 37 | ||
| 38 | // The .. splice marker in a secondary-init formal-arg list | |
| 39 | // parses as a synthetic VARIABLE flagged is_splice. The | |
| 40 | // rewrite-primary-constructors pass expands it into the | |
| 41 | // surrounding class's primary parameters; no downstream | |
| 42 | // phase ever observes it. Outside an init parameter list | |
| 43 | // (the function parser opens / closes the window via | |
| 44 | // `context.in_init_arguments`) it's a syntax error. | |
| 45 | if | |
| 46 | context.current.token == Lexical.TOKEN.OPERATOR /\ | |
| 47 | context.current.value_string =~ ".." | |
| 48 | then | |
| 49 | let splice_location = context.location; | |
| 50 | context.next_token(); | |
| 51 | ||
| 52 | let splice = Trees.Variables.VARIABLE( | |
| 53 | splice_location, | |
| 54 | Trees.Identifiers.Identifier(splice_location, "$splice"), | |
| 55 | Trees.TypeExpressions.INFER(splice_location), | |
| 56 | false, | |
| 57 | false, | |
| 58 | null | |
| 59 | ); | |
| 60 | ||
| 61 | splice.mark_splice(); | |
| 62 | ||
| 63 | if !context.in_init_arguments then | |
| 64 | context.error( | |
| 65 | splice_location, | |
| 66 | ".. is only allowed in an init parameter list" | |
| 67 | ); | |
| 68 | splice.poison(true); | |
| 69 | fi | |
| 70 | ||
| 71 | if pragmas? then | |
| 72 | context.error( | |
| 73 | splice_location, | |
| 74 | "attribute is not allowed on the .. splice marker" | |
| 75 | ); | |
| 76 | splice.poison(true); | |
| 77 | fi | |
| 78 | ||
| 79 | return splice; | |
| 80 | fi | |
| 81 | ||
| 82 | let variable_left: Trees.Variables.VariableLeft mut; | |
| 83 | ||
| 84 | if context.current_token == Lexical.TOKEN.PAREN_OPEN then | |
| 85 | variable_left = destructure_left_parser.parse(context)!; | |
| 86 | elif context.current_token == Lexical.TOKEN.IDENTIFIER then | |
| 87 | let identifier = identifier_parser.parse(context); | |
| 88 | ||
| 89 | if identifier? then | |
| 90 | variable_left = Trees.Variables.SIMPLE_VARIABLE_LEFT(identifier.location, identifier); | |
| 91 | else | |
| 92 | return null; | |
| 93 | fi | |
| 94 | else | |
| 95 | context.expect_token([Lexical.TOKEN.IDENTIFIER, Lexical.TOKEN.PAREN_OPEN], "in variable"); | |
| 96 | return null; | |
| 97 | fi | |
| 98 | ||
| 99 | let end mut = variable_left.location; | |
| 100 | let type_expression: Trees.TypeExpressions.TypeExpression mut = Trees.TypeExpressions.INFER(start::context.location); | |
| 101 | let initializer: Trees.Expressions.Expression? mut = _; | |
| 102 | let is_explicit_type mut = false; | |
| 103 | ||
| 104 | if context.current.token == Lexical.TOKEN.COLON then | |
| 105 | is_explicit_type = true; | |
| 106 | context.next_token(); | |
| 107 | type_expression = type_parser.parse(context)!; | |
| 108 | ||
| 109 | end = type_expression.location; | |
| 110 | fi | |
| 111 | ||
| 112 | let is_mutable_marked mut = false; | |
| 113 | if context.current_token == Lexical.TOKEN.MUT then | |
| 114 | context.next_token(); | |
| 115 | is_mutable_marked = true; | |
| 116 | end = context.location; | |
| 117 | fi | |
| 118 | ||
| 119 | // Trailing modifier list — only consumed in primary-ctor | |
| 120 | // header position. Elsewhere (`let`, formal args, secondary | |
| 121 | // inits) a stray modifier token falls through to the caller | |
| 122 | // for normal "unexpected token" handling. | |
| 123 | let modifiers: Trees.Modifiers.LIST? mut = _; | |
| 124 | if context.in_primary_ctor_params then | |
| 125 | modifiers = modifier_list_parser.parse(context)!; | |
| 126 | if !modifiers.is_empty then | |
| 127 | end = modifiers.location; | |
| 128 | fi | |
| 129 | fi | |
| 130 | ||
| 131 | if context.current.token == Lexical.TOKEN.ASSIGN then | |
| 132 | context.next_token(); | |
| 133 | initializer = expression_parser.parse(context)!; | |
| 134 | end = initializer.location; | |
| 135 | fi | |
| 136 | ||
| 137 | let result = | |
| 138 | Trees.Variables.VARIABLE( | |
| 139 | start::end, | |
| 140 | variable_left, | |
| 141 | type_expression, | |
| 142 | false, | |
| 143 | is_explicit_type, | |
| 144 | initializer | |
| 145 | ); | |
| 146 | ||
| 147 | if is_mutable_marked then | |
| 148 | result.mark_mutable(); | |
| 149 | fi | |
| 150 | ||
| 151 | if modifiers? /\ !modifiers.is_empty then | |
| 152 | result.set_modifiers(modifiers); | |
| 153 | fi | |
| 154 | ||
| 155 | if pragmas? then | |
| 156 | result.set_pragmas(pragmas); | |
| 157 | fi | |
| 158 | ||
| 159 | result.poison(type_expression.is_poisoned); | |
| 160 | ||
| 161 | return result; | |
| 162 | si | |
| 163 | si | |
| 164 | si |