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Parse ConstBlockPat

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This commit is contained in:
Lukas Wirth 2020-12-23 01:49:43 +01:00
parent be7260485e
commit 03a9bbacf2
3 changed files with 96 additions and 0 deletions
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16
crates/parser/src/grammar/patterns.rs
View file

@ -1,5 +1,7 @@
//! FIXME: write short doc here
use expressions::block_expr;
use super::*;
pub(super) const PATTERN_FIRST: TokenSet =
@ -89,6 +91,7 @@ fn atom_pat(p: &mut Parser, recovery_set: TokenSet) -> Option<CompletedMarker> {
let m = match p.nth(0) {
T![box] => box_pat(p),
T![ref] | T![mut] => ident_pat(p, true),
T![const] => const_block_pat(p),
IDENT => match p.nth(1) {
// Checks the token after an IDENT to see if a pattern is a path (Struct { .. }) or macro
// (T![x]).
@ -386,3 +389,16 @@ fn box_pat(p: &mut Parser) -> CompletedMarker {
pattern_single(p);
m.complete(p, BOX_PAT)
}
// test const_block_pat
// fn main() {
// let const { 15 } = ();
// let const { foo(); bar() } = ();
// }
fn const_block_pat(p: &mut Parser) -> CompletedMarker {
assert!(p.at(T![const]));
let m = p.start();
p.bump(T![const]);
block_expr(p);
m.complete(p, CONST_BLOCK_PAT)
}

76
crates/syntax/test_data/parser/inline/ok/0156_const_block_pat.rast Normal file
View file

@ -0,0 +1,76 @@
SOURCE_FILE@0..78
FN@0..77
FN_KW@0..2 "fn"
WHITESPACE@2..3 " "
NAME@3..7
IDENT@3..7 "main"
PARAM_LIST@7..9
L_PAREN@7..8 "("
R_PAREN@8..9 ")"
WHITESPACE@9..10 " "
BLOCK_EXPR@10..77
L_CURLY@10..11 "{"
WHITESPACE@11..16 "\n "
LET_STMT@16..38
LET_KW@16..19 "let"
WHITESPACE@19..20 " "
CONST_BLOCK_PAT@20..32
CONST_KW@20..25 "const"
WHITESPACE@25..26 " "
BLOCK_EXPR@26..32
L_CURLY@26..27 "{"
WHITESPACE@27..28 " "
LITERAL@28..30
INT_NUMBER@28..30 "15"
WHITESPACE@30..31 " "
R_CURLY@31..32 "}"
WHITESPACE@32..33 " "
EQ@33..34 "="
WHITESPACE@34..35 " "
TUPLE_EXPR@35..37
L_PAREN@35..36 "("
R_PAREN@36..37 ")"
SEMICOLON@37..38 ";"
WHITESPACE@38..43 "\n "
LET_STMT@43..75
LET_KW@43..46 "let"
WHITESPACE@46..47 " "
CONST_BLOCK_PAT@47..69
CONST_KW@47..52 "const"
WHITESPACE@52..53 " "
BLOCK_EXPR@53..69
L_CURLY@53..54 "{"
WHITESPACE@54..55 " "
EXPR_STMT@55..61
CALL_EXPR@55..60
PATH_EXPR@55..58
PATH@55..58
PATH_SEGMENT@55..58
NAME_REF@55..58
IDENT@55..58 "foo"
ARG_LIST@58..60
L_PAREN@58..59 "("
R_PAREN@59..60 ")"
SEMICOLON@60..61 ";"
WHITESPACE@61..62 " "
CALL_EXPR@62..67
PATH_EXPR@62..65
PATH@62..65
PATH_SEGMENT@62..65
NAME_REF@62..65
IDENT@62..65 "bar"
ARG_LIST@65..67
L_PAREN@65..66 "("
R_PAREN@66..67 ")"
WHITESPACE@67..68 " "
R_CURLY@68..69 "}"
WHITESPACE@69..70 " "
EQ@70..71 "="
WHITESPACE@71..72 " "
TUPLE_EXPR@72..74
L_PAREN@72..73 "("
R_PAREN@73..74 ")"
SEMICOLON@74..75 ";"
WHITESPACE@75..76 "\n"
R_CURLY@76..77 "}"
WHITESPACE@77..78 "\n"

4
crates/syntax/test_data/parser/inline/ok/0156_const_block_pat.rs Normal file
View file

@ -0,0 +1,4 @@
fn main() {
let const { 15 } = ();
let const { foo(); bar() } = ();
}