Struct PrattTable 

pub struct PrattTable { /* private fields */ }

A registry of PrattOperator entries indexed by fixity for precedence parsing.

Implementations

impl PrattTable

pub fn new() -> Self

Creates an empty table with no registered operators.

pub fn register(&mut self, operator: PrattOperator)

Registers an operator under its fixity, replacing any prior entry for the same symbol; Fixity::Mixfix operators are not stored.

pub fn lookup_nud(&self, token: &Token) -> Option<PrattOperator>

Looks up the null-denotation (prefix) operator for a leading token, if any.

pub fn lookup_led(&self, token: &Token) -> Option<PrattOperator>

Looks up the left-denotation operator for a token, preferring a postfix entry over an infix one, if any.

pub fn require_infix(&self, symbol: &Symbol) -> Result<&PrattOperator>

Returns the infix operator for the symbol, or an error if none is registered.

pub fn require_prefix(&self, symbol: &Symbol) -> Result<&PrattOperator>

Returns the prefix operator for the symbol, or an error if none is registered.

pub fn require_postfix(&self, symbol: &Symbol) -> Result<&PrattOperator>

Returns the postfix operator for the symbol, or an error if none is registered.

pub fn operators(&self) -> Vec<PrattOperator>

Collects every registered operator across all fixities.

Trait Implementations

impl Clone for PrattTable

fn clone(&self) -> PrattTable

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PrattTable

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for PrattTable

fn default() -> PrattTable

Returns the “default value” for a type.

impl Eq for PrattTable

impl PartialEq for PrattTable

fn eq(&self, other: &PrattTable) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for PrattTable