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Introduce AssocOp::Binary.

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It mirrors `ExprKind::Binary`, and contains a `BinOpKind`. This makes
`AssocOp` more like `ExprKind`. Note that the variants removed from
`AssocOp` are all named differently to `BinOpToken`, e.g. `Multiply`
instead of `Mul`, so that's an inconsistency removed.

The commit adds `precedence` and `fixity` methods to `BinOpKind`, and
calls them from the corresponding methods in `AssocOp`. This avoids the
need to create an `AssocOp` from a `BinOpKind` in a bunch of places, and
`AssocOp::from_ast_binop` is removed.

`AssocOp::to_ast_binop` is also no longer needed.

Overall things are shorter and nicer.
This commit is contained in:
Nicholas Nethercote
2024-12-19 18:24:07 +11:00
parent a8364f3b2a
commit ceafbad81f
10 changed files with 152 additions and 256 deletions
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7
compiler/rustc_ast_pretty/src/pprust/state/expr.rs
View File

@@ -5,7 +5,7 @@ use itertools::{Itertools, Position};
use rustc_ast::ptr::P;
use rustc_ast::util::classify;
use rustc_ast::util::literal::escape_byte_str_symbol;
use rustc_ast::util::parser::{self, AssocOp, ExprPrecedence, Fixity};
use rustc_ast::util::parser::{self, ExprPrecedence, Fixity};
use rustc_ast::{
self as ast, BlockCheckMode, FormatAlignment, FormatArgPosition, FormatArgsPiece, FormatCount,
FormatDebugHex, FormatSign, FormatTrait, token,
@@ -279,12 +279,11 @@ impl<'a> State<'a> {
rhs: &ast::Expr,
fixup: FixupContext,
) {
let assoc_op = AssocOp::from_ast_binop(op.node);
let binop_prec = assoc_op.precedence();
let binop_prec = op.node.precedence();
let left_prec = lhs.precedence();
let right_prec = rhs.precedence();
let (mut left_needs_paren, right_needs_paren) = match assoc_op.fixity() {
let (mut left_needs_paren, right_needs_paren) = match op.node.fixity() {
Fixity::Left => (left_prec < binop_prec, right_prec <= binop_prec),
Fixity::Right => (left_prec <= binop_prec, right_prec < binop_prec),
Fixity::None => (left_prec <= binop_prec, right_prec <= binop_prec),