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more power ⚡

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nora 2022-07-02 23:25:45 +02:00
parent c4f3e3dc93
commit 30da01fc05
1 changed files with 50 additions and 5 deletions
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55
parser/src/parser/expr.rs
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@ -170,18 +170,63 @@ fn binary_op_from_token(tok: &Tok<'_>) -> Option<BinaryOp> {
} }
} }
mod powers {
pub const COMMA: (u8, u8) = (1, 2);
pub const ASSIGN: (u8, u8) = (3, 4);
pub const TERNARY: (u8, u8) = (5, 6);
pub const LOGICAL_OR: (u8, u8) = (7, 8);
pub const LOGICAL_AND: (u8, u8) = (9, 10);
pub const BIT_OR: (u8, u8) = (11, 12);
pub const BIT_XOR: (u8, u8) = (13, 14);
pub const BIT_AND: (u8, u8) = (15, 16);
pub const EQ_NEQ: (u8, u8) = (17, 18);
pub const CMP: (u8, u8) = (19, 20);
pub const SHIFT: (u8, u8) = (21, 22);
pub const ADD_SUB: (u8, u8) = (23, 24);
pub const MUL_DIV_MOD: (u8, u8) = (25, 26);
pub const CAST: (u8, u8) = (27, 28);
pub const UNARY_OPERATOR: u8 = 29;
pub const POSTFIX: u8 = 30;
}
fn prefix_binding_power(tok: &Tok<'_>) -> u8 { fn prefix_binding_power(tok: &Tok<'_>) -> u8 {
match tok { match tok {
Tok::Punct(P::Ampersand | P::Asterisk | P::Plus | P::Minus | P::Tilde | P::Bang) => 255, Tok::Punct(P::Ampersand | P::Asterisk | P::Plus | P::Minus | P::Tilde | P::Bang) => {
powers::UNARY_OPERATOR
}
_ => panic!("invalid token in expression! {tok:?}"), _ => panic!("invalid token in expression! {tok:?}"),
} }
} }
fn infix_binding_power(tok: &Tok<'_>) -> (u8, u8) { fn infix_binding_power(tok: &Tok<'_>) -> (u8, u8) {
match tok { let Tok::Punct(puct) = tok else {
Tok::Punct(P::Comma) => (1, 2), panic!("invalid token in expression! {tok:?}")
Tok::Punct(P::Plus | P::Minus) => (3, 4), };
Tok::Punct(P::Asterisk | P::Slash) => (5, 6),
match puct {
P::Comma => powers::COMMA,
P::Eq
| P::PlusEq
| P::MinusEq
| P::AsteriskEq
| P::SlashEq
| P::PercentEq
| P::LeftLeftChevronEq
| P::RightRightChevronEq
| P::AmpersandEq
| P::CaretEq
| P::PipeEq => powers::ASSIGN,
// then, ternary here
P::PipePipe => powers::LOGICAL_OR,
P::AmpersandAmpersand => powers::LOGICAL_AND,
P::Pipe => powers::BIT_OR,
P::Caret => powers::BIT_XOR,
P::Ampersand => powers::BIT_AND,
P::EqEq | P::BangEq => powers::EQ_NEQ,
P::LeftChevron | P::RightChevron | P::LeftChevronEq | P::RightChevronEq => powers::CMP,
P::LeftLeftChevron | P::RightRightChevron => powers::SHIFT,
P::Plus | P::Minus => powers::ADD_SUB,
P::Asterisk | P::Slash | P::Percent => powers::MUL_DIV_MOD,
_ => panic!("invalid token in expression! {tok:?}"), _ => panic!("invalid token in expression! {tok:?}"),
} }
} }