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Reorganize interface parsing to be more consistent with other declarations. (#2646)

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The comments in parse_node_kind.def capture the change being made here.

Before:

```
//   _external_: DeclaredName
//     InterfaceBodyStart
//     _external_: statements
//   InterfaceBodyEnd
// InterfaceDefinition
```

After:

```
//     InterfaceIntroducer
//     DeclaredName
//   InterfaceDefinitionStart
//   _external_: declarations
// InterfaceDefinition
```

Really I just want to treat introduced things consistently. `var` defines my philosophy here: it doesn't always have a `DeclaredName`, so the `VarIntroducer` _must_ be the bounding node. By being consistent with that, I believe that overall the structure becomes easier to understand (that is, there are fewer inconsistencies to understand).

This also adds InterfaceDeclaration, since I think it can be predicted we'll have that, and it's helpful for making recover consistent with HandleDeclarationError.

Similarly, I'm also trying to standardize the loop processing a little with HandleDeclarationLoop. In the current approach, InterfaceDefinitionFinish isn't a necessary state, so I'm removing it.
This commit is contained in:
Jon Ross-Perkins
2023-03-06 16:31:01 -08:00
committed by GitHub
parent bfe5c36bfc
commit 4083d7f5b9
12 changed files with 266 additions and 252 deletions
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toolchain/parser/testdata/generics/interface/empty.carbon
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+5 -5
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@@ -5,11 +5,11 @@
// AUTOUPDATE
// RUN: %{carbon-run-parser}
// CHECK:STDOUT: [
// CHECK:STDOUT: {kind: 'DeclaredName', text: 'foo'},
// CHECK:STDOUT: {kind: 'InterfaceBodyStart', text: '{'},
// CHECK:STDOUT: {kind: 'InterfaceBody', text: '}', subtree_size: 2},
// CHECK:STDOUT: {kind: 'InterfaceDefinition', text: 'interface', subtree_size: 4},
// CHECK:STDOUT: {kind: 'InterfaceIntroducer', text: 'interface'},
// CHECK:STDOUT: {kind: 'DeclaredName', text: 'Foo'},
// CHECK:STDOUT: {kind: 'InterfaceDefinitionStart', text: '{', subtree_size: 3},
// CHECK:STDOUT: {kind: 'InterfaceDefinition', text: '}', subtree_size: 4},
// CHECK:STDOUT: {kind: 'FileEnd', text: ''},
// CHECK:STDOUT: ]
interface foo {
interface Foo {
}