mirror of
https://github.com/rust-lang/rust.git
synced 2026-05-22 18:15:07 +03:00
varkor
26 lines
850 B
Rust
26 lines
850 B
Rust
//! Routines the parser uses to classify AST nodes
|
|
|
|
// Predicates on exprs and stmts that the pretty-printer and parser use
|
|
|
|
use crate::ast;
|
|
|
|
/// Does this expression require a semicolon to be treated
|
|
/// as a statement? The negation of this: 'can this expression
|
|
/// be used as a statement without a semicolon' -- is used
|
|
/// as an early-bail-out in the parser so that, for instance,
|
|
/// if true {...} else {...}
|
|
/// |x| 5
|
|
/// isn't parsed as (if true {...} else {...} | x) | 5
|
|
pub fn expr_requires_semi_to_be_stmt(e: &ast::Expr) -> bool {
|
|
match e.kind {
|
|
ast::ExprKind::If(..) |
|
|
ast::ExprKind::Match(..) |
|
|
ast::ExprKind::Block(..) |
|
|
ast::ExprKind::While(..) |
|
|
ast::ExprKind::Loop(..) |
|
|
ast::ExprKind::ForLoop(..) |
|
|
ast::ExprKind::TryBlock(..) => false,
|
|
_ => true,
|
|
}
|
|
}
|