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feat: improve parser error recovery for function parameters

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This commit is contained in:
Aleksey Kladov 2021-07-17 22:41:04 +03:00
parent a2f83c956e
commit 15f11dce4a
10 changed files with 106 additions and 21 deletions
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14
crates/ide_completion/src/completions/fn_param.rs
View file

@ -101,6 +101,20 @@ fn baz(file$0) {}
);
}
#[test]
fn test_param_completion_first_param() {
check(
r#"
fn foo(file_id: FileId) {}
fn bar(file_id: FileId) {}
fn baz(file$0 id: u32) {}
"#,
expect![[r#"
bn file_id: FileId
"#]],
);
}
#[test]
fn test_param_completion_nth_param() {
check(

7
crates/parser/src/grammar/items/consts.rs
View file

@ -21,8 +21,11 @@ fn const_or_static(p: &mut Parser, m: Marker, kw: SyntaxKind, def: SyntaxKind) {
// test_err static_underscore
// static _: i32 = 5;
types::ascription(p);
if p.at(T![:]) {
types::ascription(p);
} else {
p.error("missing type for `const` or `static`")
}
if p.eat(T![=]) {
expressions::expr(p);
}

14
crates/parser/src/grammar/params.rs
View file

@ -106,7 +106,13 @@ fn param(p: &mut Parser, m: Marker, flavor: Flavor) -> Variadic {
if variadic_param(p) {
res = Variadic(true)
} else {
types::ascription(p);
if p.at(T![:]) {
types::ascription(p)
} else {
// test_err missing_fn_param_type
// fn f(x y: i32, z, t: i32) {}
p.error("missing type for function parameter")
}
}
}
// test value_parameters_no_patterns
@ -126,7 +132,11 @@ fn param(p: &mut Parser, m: Marker, flavor: Flavor) -> Variadic {
if variadic_param(p) {
res = Variadic(true)
} else {
types::ascription(p);
if p.at(T![:]) {
types::ascription(p)
} else {
p.error("missing type for function parameter")
}
}
} else {
types::type_(p);

6
crates/parser/src/grammar/type_params.rs
View file

@ -67,7 +67,11 @@ fn const_param(p: &mut Parser, m: Marker) {
assert!(p.at(T![const]));
p.bump(T![const]);
name(p);
types::ascription(p);
if p.at(T![:]) {
types::ascription(p);
} else {
p.error("missing type for const parameter");
}
// test const_param_defaults
// struct A<const N: i32 = -1>;

3
crates/parser/src/grammar/types.rs
View file

@ -55,7 +55,8 @@ fn type_with_bounds_cond(p: &mut Parser, allow_bounds: bool) {
}
pub(super) fn ascription(p: &mut Parser) {
p.expect(T![:]);
assert!(p.at(T![:]));
p.bump(T![:]);
type_(p)
}

3
crates/syntax/test_data/parser/err/0018_incomplete_fn.rast
View file

@ -127,7 +127,6 @@ SOURCE_FILE@0..183
R_CURLY@181..182 "}"
WHITESPACE@182..183 "\n"
error 34..34: expected pattern
error 34..34: expected COLON
error 34..34: expected type
error 34..34: missing type for function parameter
error 180..180: expected function arguments
error 180..180: expected a block

3
crates/syntax/test_data/parser/err/0021_incomplete_param.rast
View file

@ -30,5 +30,4 @@ SOURCE_FILE@0..22
WHITESPACE@19..20 "\n"
R_CURLY@20..21 "}"
WHITESPACE@21..22 "\n"
error 16..16: expected COLON
error 16..16: expected type
error 16..16: missing type for function parameter

24
crates/syntax/test_data/parser/err/0045_item_modifiers.rast
View file

@ -17,22 +17,22 @@ SOURCE_FILE@0..50
L_CURLY@22..23 "{"
R_CURLY@23..24 "}"
WHITESPACE@24..25 "\n"
CONST@25..46
CONST@25..40
UNSAFE_KW@25..31 "unsafe"
WHITESPACE@31..32 " "
CONST_KW@32..37 "const"
WHITESPACE@37..38 " "
ERROR@38..40
FN_KW@38..40 "fn"
WHITESPACE@40..41 " "
PATH_TYPE@41..46
PATH@41..46
PATH_SEGMENT@41..46
NAME_REF@41..44
IDENT@41..44 "bar"
PARAM_LIST@44..46
L_PAREN@44..45 "("
R_PAREN@45..46 ")"
WHITESPACE@40..41 " "
MACRO_CALL@41..46
PATH@41..44
PATH_SEGMENT@41..44
NAME_REF@41..44
IDENT@41..44 "bar"
TOKEN_TREE@44..46
L_PAREN@44..45 "("
R_PAREN@45..46 ")"
WHITESPACE@46..47 " "
ERROR@47..49
L_CURLY@47..48 "{"
@ -40,6 +40,8 @@ SOURCE_FILE@0..50
WHITESPACE@49..50 "\n"
error 6..6: expected existential, fn, trait or impl
error 38..38: expected a name
error 40..40: expected COLON
error 40..40: missing type for `const` or `static`
error 40..40: expected SEMICOLON
error 44..44: expected BANG
error 46..46: expected SEMICOLON
error 47..47: expected an item

52
crates/syntax/test_data/parser/inline/err/0015_missing_fn_param_type.rast Normal file
View file

@ -0,0 +1,52 @@
SOURCE_FILE@0..29
FN@0..28
FN_KW@0..2 "fn"
WHITESPACE@2..3 " "
NAME@3..4
IDENT@3..4 "f"
PARAM_LIST@4..25
L_PAREN@4..5 "("
PARAM@5..6
IDENT_PAT@5..6
NAME@5..6
IDENT@5..6 "x"
WHITESPACE@6..7 " "
PARAM@7..13
IDENT_PAT@7..8
NAME@7..8
IDENT@7..8 "y"
COLON@8..9 ":"
WHITESPACE@9..10 " "
PATH_TYPE@10..13
PATH@10..13
PATH_SEGMENT@10..13
NAME_REF@10..13
IDENT@10..13 "i32"
COMMA@13..14 ","
WHITESPACE@14..15 " "
PARAM@15..16
IDENT_PAT@15..16
NAME@15..16
IDENT@15..16 "z"
COMMA@16..17 ","
WHITESPACE@17..18 " "
PARAM@18..24
IDENT_PAT@18..19
NAME@18..19
IDENT@18..19 "t"
COLON@19..20 ":"
WHITESPACE@20..21 " "
PATH_TYPE@21..24
PATH@21..24
PATH_SEGMENT@21..24
NAME_REF@21..24
IDENT@21..24 "i32"
R_PAREN@24..25 ")"
WHITESPACE@25..26 " "
BLOCK_EXPR@26..28
L_CURLY@26..27 "{"
R_CURLY@27..28 "}"
WHITESPACE@28..29 "\n"
error 6..6: missing type for function parameter
error 6..6: expected COMMA
error 16..16: missing type for function parameter

1
crates/syntax/test_data/parser/inline/err/0015_missing_fn_param_type.rs Normal file
View file

@ -0,0 +1 @@
fn f(x y: i32, z, t: i32) {}