Enum TokenRole 

pub enum TokenRole {
    BracketOpen,
    BracketClose,
    Separator,
    Keyword,
    Operator,
    Connector,
    Terminal,
    Immediate,
}

Structural role of a STRING token within a grammar rule.

Derived at Grammar construction time from the token’s position in the production rule body. The role determines spacing behavior in the layout pass via a role-pair lookup table.

Variants

BracketOpen

First STRING in a matched-pair SEQ (e.g. (, [, {, <, begin, ${, ⟨). No space after.

BracketClose

Last STRING in a matched-pair SEQ (e.g. ), ], }, >, end, ⟩). No space before.

Separator

First STRING in a REPEAT body’s inner SEQ (e.g. , in REPEAT(SEQ [",", item])). No space before, space after.

Keyword

Alphanumeric STRING that is a language keyword (e.g. if, while, and, model). Space before and after.

Operator

Non-alphanumeric STRING between content members inside a CHOICE alternative (e.g. +, =, ~, <- in binary expression alternatives). Space before and after.

Connector

Non-alphanumeric STRING between content members in a standalone SEQ (not inside a CHOICE). Examples: . in attribute, :: in scoped_identifier, -> in pointer_member. These are structural connectors, not algebraic operators. No space.

Terminal

Text from a leaf vertex’s literal-value constraint.

Immediate

A token the grammar wraps in IMMEDIATE_TOKEN: the lexer emits it glued to its neighbour with no intervening whitespace (the . in a float literal 0.5, an immediate string delimiter). Tight on both sides, unconditionally. Mirrors panproto_gat::LayoutRole::Immediate.

Trait Implementations

impl Clone for TokenRole

fn clone(&self) -> TokenRole

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TokenRole

impl Debug for TokenRole

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

Formats the value using the given formatter.

impl Eq for TokenRole

impl Hash for TokenRole

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TokenRole

fn eq(&self, other: &TokenRole) -> 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 TokenRole