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https://github.com/danbulant/oxc
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335b7f22c5
Part of https://github.com/oxc-project/backlog/issues/130 I didn't add doc comments to everything; I'm missing context for module-related data types and I have other things to do :P
75 lines
2.1 KiB
Rust
75 lines
2.1 KiB
Rust
#![allow(missing_docs)] // fixme
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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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