mirror of
https://github.com/danbulant/oxc
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a558492bf9
part of https://github.com/oxc-project/backlog/issues/58 `monitor-oxc` run: https://github.com/oxc-project/monitor-oxc/actions/runs/10179047831 binary expression stack length tally using `counts` in top 100 npm packages from monitor-oxc: ``` 29772 counts ( 1) 17652 (59.3%, 59.3%): 0 ( 2) 5772 (19.4%, 78.7%): 1 ( 3) 3204 (10.8%, 89.4%): 2 ( 4) 1276 ( 4.3%, 93.7%): 3 ( 5) 616 ( 2.1%, 95.8%): 4 ( 6) 308 ( 1.0%, 96.8%): 5 ( 7) 202 ( 0.7%, 97.5%): 6 ( 8) 168 ( 0.6%, 98.1%): 7 ( 9) 114 ( 0.4%, 98.5%): 9 ( 10) 90 ( 0.3%, 98.8%): 8 ( 11) 84 ( 0.3%, 99.0%): 13 ( 12) 58 ( 0.2%, 99.2%): 10 ( 13) 48 ( 0.2%, 99.4%): 12 ( 14) 32 ( 0.1%, 99.5%): 11 ( 15) 20 ( 0.1%, 99.6%): 134 ( 16) 16 ( 0.1%, 99.6%): 18 ( 17) 16 ( 0.1%, 99.7%): 20 ( 18) 12 ( 0.0%, 99.7%): 19 ( 19) 12 ( 0.0%, 99.8%): 35 ( 20) 12 ( 0.0%, 99.8%): 51 ( 21) 10 ( 0.0%, 99.8%): 15 ( 22) 6 ( 0.0%, 99.9%): 17 ( 23) 6 ( 0.0%, 99.9%): 21 ( 24) 6 ( 0.0%, 99.9%): 45 ( 25) 4 ( 0.0%, 99.9%): 14 ( 26) 4 ( 0.0%, 99.9%): 26 ( 27) 4 ( 0.0%, 99.9%): 53 ( 28) 2 ( 0.0%, 99.9%): 172 ( 29) 2 ( 0.0%, 99.9%): 214 ( 30) 2 ( 0.0%,100.0%): 22 ( 31) 2 ( 0.0%,100.0%): 27 ( 32) 2 ( 0.0%,100.0%): 28 ( 33) 2 ( 0.0%,100.0%): 29 ( 34) 2 ( 0.0%,100.0%): 31 ( 35) 2 ( 0.0%,100.0%): 36 ( 36) 2 ( 0.0%,100.0%): 46 ( 37) 2 ( 0.0%,100.0%): 55 ```
74 lines
2.1 KiB
Rust
74 lines
2.1 KiB
Rust
pub trait GetPrecedence {
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fn precedence(&self) -> Precedence;
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}
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/// Operator Precedence
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///
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/// The following values are meaningful relative position, not their individual values.
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/// The relative positions are derived from the ECMA Spec by following the grammar bottom up, starting from the "Comma Operator".
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///
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/// Note: This differs from the the operator precedence table
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/// <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence#table>
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/// but the relative positions are the same, as both are derived from the ECMA specification.
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///
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/// The values are the same as
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/// [esbuild](https://github.com/evanw/esbuild/blob/78f89e41d5e8a7088f4820351c6305cc339f8820/internal/js_ast/js_ast.go#L28)
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#[derive(Debug, Clone, Copy, Eq, PartialEq, Ord, PartialOrd)]
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#[repr(u8)]
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pub enum Precedence {
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Lowest = 0,
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Comma = 1,
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Spread = 2,
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Yield = 3,
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Assign = 4,
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Conditional = 5,
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NullishCoalescing = 6,
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LogicalOr = 7,
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LogicalAnd = 8,
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BitwiseOr = 9,
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BitwiseXor = 10,
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BitwiseAnd = 11,
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Equals = 12,
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Compare = 13,
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Shift = 14,
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Add = 15,
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Multiply = 16,
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Exponentiation = 17,
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Prefix = 18,
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Postfix = 19,
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New = 20,
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Call = 21,
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Member = 22,
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}
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impl Precedence {
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pub fn is_right_associative(&self) -> bool {
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matches!(self, Self::Exponentiation | Self::Conditional | Self::Assign)
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}
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pub fn is_left_associative(&self) -> bool {
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matches!(
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self,
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Self::Lowest
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| Self::Comma
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| Self::Spread
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| Self::Yield
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| Self::NullishCoalescing
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| Self::LogicalOr
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| Self::LogicalAnd
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| Self::BitwiseOr
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| Self::BitwiseXor
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| Self::BitwiseAnd
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| Self::Equals
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| Self::Compare
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| Self::Shift
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| Self::Add
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| Self::Multiply
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| Self::Prefix
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| Self::Postfix
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| Self::New
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| Self::Call
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| Self::Member
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)
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}
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}
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