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Simplify

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This commit is contained in:
Aleksey Kladov 2018-08-24 00:48:10 +03:00
parent dd64a155e9
commit cf7d4a2a24
5 changed files with 63 additions and 39 deletions
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5
crates/libsyntax2/src/grammar.ron
View file

@ -41,6 +41,11 @@ Grammar(
[">=", "GTEQ"],
["+=", "PLUSEQ"],
["-=", "MINUSEQ"],
["|=", "PIPEEQ"],
["&=", "AMPEQ"],
["^=", "CARETEQ"],
["/=", "SLASHEQ"],
["*=", "STAREQ"],
["&&", "AMPAMP"],
["||", "PIPEPIPE"],
["<<", "SHL"],

54
crates/libsyntax2/src/grammar/expressions/mod.rs
View file

@ -45,35 +45,33 @@ enum Op {
}
fn current_op(p: &Parser) -> (u8, Op) {
if p.at_compound2(PLUS, EQ) {
return (1, Op::Composite(PLUSEQ, 2));
if let Some(t) = p.next3() {
match t {
(L_ANGLE, L_ANGLE, EQ) =>
return (1, Op::Composite(SHLEQ, 3)),
(R_ANGLE, R_ANGLE, EQ) =>
return (1, Op::Composite(SHREQ, 3)),
_ => (),
}
}
if p.at_compound2(MINUS, EQ) {
return (1, Op::Composite(MINUSEQ, 2));
}
if p.at_compound3(L_ANGLE, L_ANGLE, EQ) {
return (1, Op::Composite(SHLEQ, 3));
}
if p.at_compound3(R_ANGLE, R_ANGLE, EQ) {
return (1, Op::Composite(SHREQ, 3));
}
if p.at_compound2(PIPE, PIPE) {
return (3, Op::Composite(PIPEPIPE, 2));
}
if p.at_compound2(AMP, AMP) {
return (4, Op::Composite(AMPAMP, 2));
}
if p.at_compound2(L_ANGLE, EQ) {
return (5, Op::Composite(LTEQ, 2));
}
if p.at_compound2(R_ANGLE, EQ) {
return (5, Op::Composite(GTEQ, 2));
}
if p.at_compound2(L_ANGLE, L_ANGLE) {
return (9, Op::Composite(SHL, 2));
}
if p.at_compound2(R_ANGLE, R_ANGLE) {
return (9, Op::Composite(SHR, 2));
if let Some(t) = p.next2() {
match t {
(PLUS, EQ) => return (1, Op::Composite(PLUSEQ, 2)),
(MINUS, EQ) => return (1, Op::Composite(MINUSEQ, 2)),
(STAR, EQ) => return (1, Op::Composite(STAREQ, 2)),
(SLASH, EQ) => return (1, Op::Composite(SLASHEQ, 2)),
(PIPE, EQ) => return (1, Op::Composite(PIPEEQ, 2)),
(AMP, EQ) => return (1, Op::Composite(AMPEQ, 2)),
(CARET, EQ) => return (1, Op::Composite(CARETEQ, 2)),
(PIPE, PIPE) => return (3, Op::Composite(PIPEPIPE, 2)),
(AMP, AMP) => return (4, Op::Composite(AMPAMP, 2)),
(L_ANGLE, EQ) => return (5, Op::Composite(LTEQ, 2)),
(R_ANGLE, EQ) => return (5, Op::Composite(GTEQ, 2)),
(L_ANGLE, L_ANGLE) => return (9, Op::Composite(SHL, 2)),
(R_ANGLE, R_ANGLE) => return (9, Op::Composite(SHR, 2)),
_ => (),
}
}
let bp = match p.current() {

8
crates/libsyntax2/src/parser_api.rs
View file

@ -68,12 +68,12 @@ impl<'t> Parser<'t> {
self.current() == kind
}
pub(crate) fn at_compound2(&self, c1: SyntaxKind, c2: SyntaxKind) -> bool {
self.0.at_compound2(c1, c2)
pub(crate) fn next2(&self) -> Option<(SyntaxKind, SyntaxKind)> {
self.0.next2()
}
pub(crate) fn at_compound3(&self, c1: SyntaxKind, c2: SyntaxKind, c3: SyntaxKind) -> bool {
self.0.at_compound3(c1, c2, c3)
pub(crate) fn next3(&self) -> Option<(SyntaxKind, SyntaxKind, SyntaxKind)> {
self.0.next3()
}
/// Checks if the current token is contextual keyword with text `t`.

25
crates/libsyntax2/src/parser_impl/mod.rs
View file

@ -65,15 +65,26 @@ impl<'t> ParserImpl<'t> {
self.events
}
pub(super) fn at_compound2(&self, c1: SyntaxKind, c2: SyntaxKind) -> bool {
self.inp.kind(self.pos) == c1 && self.inp.kind(self.pos + 1) == c2
&& self.inp.start(self.pos + 1) == self.inp.start(self.pos) + self.inp.len(self.pos)
pub(super) fn next2(&self) -> Option<(SyntaxKind, SyntaxKind)> {
let c1 = self.inp.kind(self.pos);
let c2 = self.inp.kind(self.pos + 1);
if self.inp.start(self.pos + 1) == self.inp.start(self.pos) + self.inp.len(self.pos) {
Some((c1, c2))
} else {
None
}
}
pub(super) fn at_compound3(&self, c1: SyntaxKind, c2: SyntaxKind, c3: SyntaxKind) -> bool {
self.inp.kind(self.pos) == c1 && self.inp.kind(self.pos + 1) == c2 && self.inp.kind(self.pos + 2) == c3
&& self.inp.start(self.pos + 1) == self.inp.start(self.pos) + self.inp.len(self.pos)
&& self.inp.start(self.pos + 2) == self.inp.start(self.pos + 1) + self.inp.len(self.pos + 1)
pub(super) fn next3(&self) -> Option<(SyntaxKind, SyntaxKind, SyntaxKind)> {
let c1 = self.inp.kind(self.pos);
let c2 = self.inp.kind(self.pos + 1);
let c3 = self.inp.kind(self.pos + 2);
if self.inp.start(self.pos + 1) == self.inp.start(self.pos) + self.inp.len(self.pos)
&& self.inp.start(self.pos + 2) == self.inp.start(self.pos + 1) + self.inp.len(self.pos + 1){
Some((c1, c2, c3))
} else {
None
}
}
pub(super) fn nth(&self, n: u32) -> SyntaxKind {

10
crates/libsyntax2/src/syntax_kinds/generated.rs
View file

@ -50,6 +50,11 @@ pub enum SyntaxKind {
GTEQ,
PLUSEQ,
MINUSEQ,
PIPEEQ,
AMPEQ,
CARETEQ,
SLASHEQ,
STAREQ,
AMPAMP,
PIPEPIPE,
SHL,
@ -288,6 +293,11 @@ impl SyntaxKind {
GTEQ => &SyntaxInfo { name: "GTEQ" },
PLUSEQ => &SyntaxInfo { name: "PLUSEQ" },
MINUSEQ => &SyntaxInfo { name: "MINUSEQ" },
PIPEEQ => &SyntaxInfo { name: "PIPEEQ" },
AMPEQ => &SyntaxInfo { name: "AMPEQ" },
CARETEQ => &SyntaxInfo { name: "CARETEQ" },
SLASHEQ => &SyntaxInfo { name: "SLASHEQ" },
STAREQ => &SyntaxInfo { name: "STAREQ" },
AMPAMP => &SyntaxInfo { name: "AMPAMP" },
PIPEPIPE => &SyntaxInfo { name: "PIPEPIPE" },
SHL => &SyntaxInfo { name: "SHL" },