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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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12
crates/syntax/src/ast/make.rs
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@ -397,7 +397,7 @@ pub fn expr_match(expr: ast::Expr, match_arm_list: ast::MatchArmList) -> ast::Ex
expr_from_text(&format!("match {} {}", expr, match_arm_list))
}
pub fn expr_if(
condition: ast::Condition,
condition: ast::Expr,
then_branch: ast::BlockExpr,
else_branch: Option<ast::ElseBranch>,
) -> ast::Expr {
@ -456,14 +456,8 @@ pub fn expr_assignment(lhs: ast::Expr, rhs: ast::Expr) -> ast::Expr {
fn expr_from_text(text: &str) -> ast::Expr {
ast_from_text(&format!("const C: () = {};", text))
}
pub fn condition(expr: ast::Expr, pattern: Option<ast::Pat>) -> ast::Condition {
match pattern {
None => ast_from_text(&format!("const _: () = while {} {{}};", expr)),
Some(pattern) => {
ast_from_text(&format!("const _: () = while let {} = {} {{}};", pattern, expr))
}
}
pub fn expr_let(pattern: ast::Pat, expr: ast::Expr) -> ast::LetExpr {
ast_from_text(&format!("const _: () = while let {} = {} {{}};", pattern, expr))
}
pub fn arg_list(args: impl IntoIterator<Item = ast::Expr>) -> ast::ArgList {