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Parse let expressions in order to support let chains

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We still need to reject freestanding `let` expressions: see https://github.com/rust-analyzer/rust-analyzer/issues/11320#issuecomment-1018212465.
This commit is contained in:
Chayim Refael Friedman 2022-01-23 04:21:09 +02:00
parent d6ed146a1c
commit de8633f15f
7 changed files with 99 additions and 67 deletions
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73
crates/syntax/src/ast/generated/nodes.rs
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@ -884,7 +884,7 @@ pub struct IfExpr {
impl ast::HasAttrs for IfExpr {}
impl IfExpr {
pub fn if_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![if]) }
pub fn condition(&self) -> Option<Condition> { support::child(&self.syntax) }
pub fn condition(&self) -> Option<Expr> { support::child(&self.syntax) }
pub fn else_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![else]) }
}
@ -1038,7 +1038,7 @@ impl ast::HasAttrs for WhileExpr {}
impl ast::HasLoopBody for WhileExpr {}
impl WhileExpr {
pub fn while_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![while]) }
pub fn condition(&self) -> Option<Condition> { support::child(&self.syntax) }
pub fn condition(&self) -> Option<Expr> { support::child(&self.syntax) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
@ -1051,6 +1051,18 @@ impl YieldExpr {
pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct LetExpr {
pub(crate) syntax: SyntaxNode,
}
impl ast::HasAttrs for LetExpr {}
impl LetExpr {
pub fn let_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![let]) }
pub fn pat(&self) -> Option<Pat> { support::child(&self.syntax) }
pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct StmtList {
pub(crate) syntax: SyntaxNode,
@ -1106,17 +1118,6 @@ impl ArgList {
pub fn r_paren_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![')']) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Condition {
pub(crate) syntax: SyntaxNode,
}
impl Condition {
pub fn let_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![let]) }
pub fn pat(&self) -> Option<Pat> { support::child(&self.syntax) }
pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct MatchArmList {
pub(crate) syntax: SyntaxNode,
@ -1147,10 +1148,7 @@ pub struct MatchGuard {
}
impl MatchGuard {
pub fn if_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![if]) }
pub fn let_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![let]) }
pub fn pat(&self) -> Option<Pat> { support::child(&self.syntax) }
pub fn eq_token(&self) -> Option<SyntaxToken> { support::token(&self.syntax, T![=]) }
pub fn expr(&self) -> Option<Expr> { support::child(&self.syntax) }
pub fn condition(&self) -> Option<Expr> { support::child(&self.syntax) }
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
@ -1524,6 +1522,7 @@ pub enum Expr {
TupleExpr(TupleExpr),
WhileExpr(WhileExpr),
YieldExpr(YieldExpr),
LetExpr(LetExpr),
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
@ -2664,6 +2663,17 @@ impl AstNode for YieldExpr {
}
fn syntax(&self) -> &SyntaxNode { &self.syntax }
}
impl AstNode for LetExpr {
fn can_cast(kind: SyntaxKind) -> bool { kind == LET_EXPR }
fn cast(syntax: SyntaxNode) -> Option<Self> {
if Self::can_cast(syntax.kind()) {
Some(Self { syntax })
} else {
None
}
}
fn syntax(&self) -> &SyntaxNode { &self.syntax }
}
impl AstNode for StmtList {
fn can_cast(kind: SyntaxKind) -> bool { kind == STMT_LIST }
fn cast(syntax: SyntaxNode) -> Option<Self> {
@ -2719,17 +2729,6 @@ impl AstNode for ArgList {
}
fn syntax(&self) -> &SyntaxNode { &self.syntax }
}
impl AstNode for Condition {
fn can_cast(kind: SyntaxKind) -> bool { kind == CONDITION }
fn cast(syntax: SyntaxNode) -> Option<Self> {
if Self::can_cast(syntax.kind()) {
Some(Self { syntax })
} else {
None
}
}
fn syntax(&self) -> &SyntaxNode { &self.syntax }
}
impl AstNode for MatchArmList {
fn can_cast(kind: SyntaxKind) -> bool { kind == MATCH_ARM_LIST }
fn cast(syntax: SyntaxNode) -> Option<Self> {
@ -3336,6 +3335,9 @@ impl From<WhileExpr> for Expr {
impl From<YieldExpr> for Expr {
fn from(node: YieldExpr) -> Expr { Expr::YieldExpr(node) }
}
impl From<LetExpr> for Expr {
fn from(node: LetExpr) -> Expr { Expr::LetExpr(node) }
}
impl AstNode for Expr {
fn can_cast(kind: SyntaxKind) -> bool {
match kind {
@ -3344,7 +3346,7 @@ impl AstNode for Expr {
| INDEX_EXPR | LITERAL | LOOP_EXPR | MACRO_CALL | MACRO_STMTS | MATCH_EXPR
| METHOD_CALL_EXPR | PAREN_EXPR | PATH_EXPR | PREFIX_EXPR | RANGE_EXPR
| RECORD_EXPR | REF_EXPR | RETURN_EXPR | TRY_EXPR | TUPLE_EXPR | WHILE_EXPR
| YIELD_EXPR => true,
| YIELD_EXPR | LET_EXPR => true,
_ => false,
}
}
@ -3381,6 +3383,7 @@ impl AstNode for Expr {
TUPLE_EXPR => Expr::TupleExpr(TupleExpr { syntax }),
WHILE_EXPR => Expr::WhileExpr(WhileExpr { syntax }),
YIELD_EXPR => Expr::YieldExpr(YieldExpr { syntax }),
LET_EXPR => Expr::LetExpr(LetExpr { syntax }),
_ => return None,
};
Some(res)
@ -3418,6 +3421,7 @@ impl AstNode for Expr {
Expr::TupleExpr(it) => &it.syntax,
Expr::WhileExpr(it) => &it.syntax,
Expr::YieldExpr(it) => &it.syntax,
Expr::LetExpr(it) => &it.syntax,
}
}
}
@ -3883,6 +3887,7 @@ impl AstNode for AnyHasAttrs {
| TUPLE_EXPR
| WHILE_EXPR
| YIELD_EXPR
| LET_EXPR
| STMT_LIST
| RECORD_EXPR_FIELD_LIST
| RECORD_EXPR_FIELD
@ -4537,6 +4542,11 @@ impl std::fmt::Display for YieldExpr {
std::fmt::Display::fmt(self.syntax(), f)
}
}
impl std::fmt::Display for LetExpr {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)
}
}
impl std::fmt::Display for StmtList {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)
@ -4562,11 +4572,6 @@ impl std::fmt::Display for ArgList {
std::fmt::Display::fmt(self.syntax(), f)
}
}
impl std::fmt::Display for Condition {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)
}
}
impl std::fmt::Display for MatchArmList {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
std::fmt::Display::fmt(self.syntax(), f)