Signed-off-by: erick-alcachofa <erick@artichoke.dev>
This commit addresses several critical issues in the recursive descent
parser, specifically regarding the handling of empty constructs,
statement termination, and AST representation of nested scopes. These
changes bring the implementation in line with the Artichoke EBNF
specification.
* **CodeBlock as Statement:** Added `CodeBlockStmtNode` to the
`StatementNode` variant. This allows a bare `{}` to be treated as a
valid statement, enabling manual scoping within functions.
* **Visitor Support:** Updated `toDot.cpp` (Graphviz) and `toString.cpp`
(Pretty-print) to support the new `CodeBlockStmtNode` during AST
traversal.
* **Empty Member Lists:** Implemented a pre-loop check for the closing
brace `}` in `parseStruct` and `parseEnum`. This prevents the parser
from attempting to parse members in empty declarations (e.g., `struct
Empty {}`).
* **Diagnostic Accuracy:** Enhanced the member-parsing loop to provide
better error context. If a member is not followed by a comma or a
closing brace, the parser now explicitly suggests `',' or '}'` as the
expected tokens.
* **Nested Scopes:** The parser now correctly identifies a `{` at the
start of a statement and dispatches to `parseCodeBlock`.
* **Empty Code Blocks:** Added a guard in the block-parsing loop to
check for `}` immediately after `{`, allowing functions or nested
scopes to be empty.
* **C-Style For-Loops:** Replaced `match` with `matchAndConsume` for the
initialization semicolon. This allows the parser to correctly handle
loops where the initialization is omitted (e.g., `for (; 1; 1)`).
* **Correctness:** Resolves parser hangs or errors when encountering
empty blocks.
* **Compliance:** Fully supports the EBNF definition of zero-or-more
members/statements.
* **Visuals:** AST diagrams now accurately reflect nested block
structures.
erick-alcachofa
30d64d9b65
