Enum ParseTree 

pub enum ParseTree {
    Rule(RuleNode),
    Terminal(TerminalNode),
    Error(ErrorNode),
}

Variants

Rule(RuleNode)

Terminal(TerminalNode)

Error(ErrorNode)

Implementations

impl ParseTree

pub fn children(&self) -> &[ParseTree]

Returns this node’s direct children.

Rule nodes return their context children; terminal and error nodes return an empty slice, so generic recursive walks can start from a &ParseTree without matching on every variant first.

pub fn descendants(&self) -> ParseTreeDescendants<'_>

Iterates this tree in pre-order, starting with self.

pub fn pre_order(&self) -> ParseTreeDescendants<'_>

Iterates this tree in pre-order, starting with self.

This is an alias for Self::descendants for callers that prefer to name the traversal order explicitly.

pub fn text(&self) -> String

pub fn to_string_tree_with_names<S>(&self, rule_names: &[S]) -> String

where S: AsRef<str>,

pub fn to_string_tree<R>(&self, recognizer: Option<&R>) -> String

where R: Recognizer,

Renders the LISP-style tree using rule names resolved through a recognizer, matching ANTLR’s toStringTree(parser) shape used by generated test actions (<tree>.to_string_tree(Some(self))).

pub fn first_rule(&self, rule_index: usize) -> Option<&ParseTree>

Finds the first rule node with rule_index in a depth-first walk.

pub fn first_rule_stop(&self, rule_index: usize) -> Option<&CommonToken>

Finds the stop token for the first rule node with rule_index.

pub fn first_rule_int_return( &self, rule_index: usize, name: &str, ) -> Option<i64>

Reads an integer return value from the first rule node with rule_index, matching ANTLR’s $label.value resolution for labeled rule references in the runtime testsuite.

pub fn rule_attrs<T>(&self) -> Option<&T>

where T: Any,

Reads the typed attribute snapshot from this tree’s root rule node.

Generated parsers use this for $label.attr / $rule.attr reads on a child subtree returned by a rule call.

pub fn first_error_token(&self) -> Option<&CommonToken>

Finds the first recovery error token in a depth-first walk.

pub fn rule_invocation_stack<S>( &self, rule_index: usize, rule_names: &[S], ) -> Option<Vec<String>>

where S: AsRef<str>,

Returns the first rule invocation stack for rule_index, ordered from the selected rule outward to the root rule.

Trait Implementations

impl Clone for ParseTree

fn clone(&self) -> ParseTree

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ParseTree

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

Formats the value using the given formatter.

impl Eq for ParseTree

impl PartialEq for ParseTree

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for ParseTree