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| 1 | namespace Syntax.Trees.Modifiers is | |
| 2 | use System.NotImplementedException | |
| 3 | ||
| 4 | use IO.Std | |
| 5 | ||
| 6 | use Source | |
| 7 | ||
| 8 | class Modifier(location: LOCATION): Trees.Node abstract is | |
| 9 | is_public: bool => false | |
| 10 | is_protected: bool => false | |
| 11 | is_private: bool => false | |
| 12 | is_static: bool => false | |
| 13 | is_field: bool => false | |
| 14 | is_init: bool => false | |
| 15 | is_open: bool => false | |
| 16 | is_abstract: bool => false | |
| 17 | is_pure: bool => false | |
| 18 | is_stable: bool => false | |
| 19 | is_hide_in_derived: bool => false | |
| 20 | ||
| 21 | super(location) | |
| 22 | ||
| 23 | name: string => throw NotImplementedException("{self} does not implement name") | |
| 24 | accept(visitor: Visitor) is | |
| 25 | visitor.visit(self) | |
| 26 | si | |
| 27 | si | |
| 28 | ||
| 29 | class AccessModifier(location: LOCATION): Modifier abstract is | |
| 30 | super(location) | |
| 31 | ||
| 32 | copy() -> AccessModifier => | |
| 33 | cast AccessModifier?(clone())! | |
| 34 | si | |
| 35 | ||
| 36 | class StorageClass(location: LOCATION): Modifier abstract is | |
| 37 | super(location) | |
| 38 | ||
| 39 | copy() -> StorageClass => | |
| 40 | cast StorageClass?(clone())! | |
| 41 | si | |
| 42 | ||
| 43 | class PUBLIC(location: LOCATION): AccessModifier is | |
| 44 | is_public: bool => true | |
| 45 | name: string => "public" | |
| 46 | ||
| 47 | super(location) | |
| 48 | si | |
| 49 | ||
| 50 | class PROTECTED(location: LOCATION): AccessModifier is | |
| 51 | is_protected: bool => true | |
| 52 | name: string => "protected" | |
| 53 | ||
| 54 | super(location) | |
| 55 | si | |
| 56 | ||
| 57 | class PRIVATE(location: LOCATION): AccessModifier is | |
| 58 | is_private: bool => true | |
| 59 | name: string => "private" | |
| 60 | ||
| 61 | super(location) | |
| 62 | si | |
| 63 | ||
| 64 | class STATIC(location: LOCATION): StorageClass is | |
| 65 | is_static: bool => true | |
| 66 | name: string => "static" | |
| 67 | ||
| 68 | super(location) | |
| 69 | si | |
| 70 | ||
| 71 | class FIELD(location: LOCATION): StorageClass is | |
| 72 | is_field: bool => true | |
| 73 | name: string => "field" | |
| 74 | ||
| 75 | super(location) | |
| 76 | si | |
| 77 | ||
| 78 | class HIDE_IN_DERIVED(location: LOCATION): StorageClass is | |
| 79 | is_hide_in_derived: bool => true | |
| 80 | name: string => "hide_in_derived" | |
| 81 | ||
| 82 | super(location) | |
| 83 | si | |
| 84 | ||
| 85 | // Marks a primary-ctor parameter as init-scoped: no field auto-generates; | |
| 86 | // the param is in scope inside the synthesised primary init only. Rejected | |
| 87 | // anywhere else by `REWRITE_PRIMARY_CONSTRUCTORS`. Not a reserved keyword; | |
| 88 | // recognised contextually by the modifier list parser via name match on | |
| 89 | // the IDENTIFIER token. | |
| 90 | class INIT(location: LOCATION): StorageClass is | |
| 91 | is_init: bool => true | |
| 92 | name: string => "init" | |
| 93 | ||
| 94 | super(location) | |
| 95 | si | |
| 96 | ||
| 97 | // Opts a class out of the default closed-to-assembly hierarchy rule. | |
| 98 | // Without `open`, subclassing from another assembly is rejected and the | |
| 99 | // type system treats the root's subclass set as enumerable for narrowing. | |
| 100 | // Not a reserved keyword; recognised contextually by the modifier list | |
| 101 | // parser via name match on the IDENTIFIER token. Shares the storage-class | |
| 102 | // slot with FIELD/STATIC/INIT — none of those apply to classes anyway. | |
| 103 | class OPEN(location: LOCATION): StorageClass is | |
| 104 | is_open: bool => true | |
| 105 | name: string => "open" | |
| 106 | ||
| 107 | super(location) | |
| 108 | si | |
| 109 | ||
| 110 | // Marks a class as abstract. Calling its constructor directly is | |
| 111 | // rejected at compile time; subclasses can still call `super.init()` | |
| 112 | // to share base initialisation. The closed-narrowing path treats an | |
| 113 | // abstract root as not-itself-a-runtime-type, so the complement | |
| 114 | // universe is just the direct subclasses (no widening to include | |
| 115 | // the root). Independent of `open` — abstract+open is the | |
| 116 | // open-hierarchy abstract base; abstract alone is the closed | |
| 117 | // abstract base. | |
| 118 | class ABSTRACT(location: LOCATION): Modifier is | |
| 119 | is_abstract: bool => true | |
| 120 | name: string => "abstract" | |
| 121 | ||
| 122 | super(location) | |
| 123 | si | |
| 124 | ||
| 125 | // Declares a function or method effectively store-free: callers | |
| 126 | // keep flow-narrowing facts across calls to it without the body | |
| 127 | // being provable, and every override or trait implementation | |
| 128 | // must itself be pure — declared or proven. Not a reserved | |
| 129 | // keyword; recognised contextually by the modifier list parser | |
| 130 | // via name match on the IDENTIFIER token. Stands alone like | |
| 131 | // `abstract` so it can coexist with a storage class | |
| 132 | // (`static pure`). | |
| 133 | class PURE(location: LOCATION): Modifier is | |
| 134 | is_pure: bool => true | |
| 135 | name: string => "pure" | |
| 136 | ||
| 137 | super(location) | |
| 138 | si | |
| 139 | ||
| 140 | // Declares a property stable: two adjacent reads with nothing | |
| 141 | // between them agree on presence and runtime type. Trusted, not | |
| 142 | // verified — the same standing as `pure` — and binding on every | |
| 143 | // override. Orthogonal to purity: a memoiser is impure and | |
| 144 | // stable; a getter is stable when the classifier cannot prove it | |
| 145 | // from the body. Not a reserved keyword; recognised contextually | |
| 146 | // by the modifier list parser via name match on the IDENTIFIER | |
| 147 | // token. | |
| 148 | class STABLE(location: LOCATION): Modifier is | |
| 149 | is_stable: bool => true | |
| 150 | name: string => "stable" | |
| 151 | ||
| 152 | super(location) | |
| 153 | si | |
| 154 | si |