Enum NTValue 

pub enum NTValue {
    None,
    Parents,
    Default,
    SetIds(Vec<VarId>),
    SetNames(Vec<String>),
}

Determines which nonterminals have a value, so a dedicated type and field in contexts:

• None: No nonterminal has a value
• Parents: Only the top nonterminal parents have a value
• Default: The top nonterminal parents and the children of (<L> )+* have a value
• SetIds(Vec<VarId>): The nonterminals that have a value is set explicitly by ID
• SetNames(Vec<String>): The nonterminals that have a value is set explicitly by name. The names “<default>” and “<parents>” can be used to set all the nonterminals of the corresponding class. Individual nonterminals can be preceded by a “-” to indicate they don’t hold a value.

Variants

None

No nonterminal has a value

Parents

Only the top nonterminal parents have a value

Default

The top nonterminal parents and the children of (<L> )+* have a value

SetIds(Vec<VarId>)

The set of nonterminals that have a value is set explicitly by ID

SetNames(Vec<String>)

The set of nonterminals that have a value is set explicitly by name. Individual names preceded by a “-” don’t have a value.

Implementations

impl NTValue

pub const DEFAULT: &str = "<default>"

Only the top nonterminal parents have a value (can be used in NTValue::SetNames)

pub const PARENTS: &str = "<parents>"

The top nonterminal parents and the children of (<L> )+* have a value (can be used in NTValue::SetNames)

pub fn is_none(&self) -> bool

pub fn is_parents(&self) -> bool

pub fn is_default(&self) -> bool

pub fn is_ids(&self) -> bool

pub fn is_names(&self) -> bool

Trait Implementations

impl Clone for NTValue

fn clone(&self) -> NTValue

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NTValue

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

Formats the value using the given formatter.

impl Default for NTValue

fn default() -> NTValue

Returns the “default value” for a type.

impl PartialEq for NTValue

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