Struct DebugObserver 

pub struct DebugObserver<N: Node> { /* private fields */ }

An observer that prints parsing steps to stdin.

You can provide this function to the ImmutableSyntaxTree::parse_with_observer to test particular syntax parser steps against an arbitrary token input.

Alternatively, consider using Node::debug where you can use arbitrary text instead of a predefined token stream.

Trait Implementations

impl<N: Node> Default for DebugObserver<N>

fn default() -> Self

Returns the “default value” for a type.

impl<N: Node> Observer for DebugObserver<N>

type Node = N

Specifies a type of the Node that is currently being parsed.

fn read_token( &mut self, token: <Self::Node as Node>::Token, _token_ref: TokenRef, )

The parser reported consuming of a token from the token input stream.

fn enter_rule(&mut self, rule: NodeRule, _node_ref: NodeRef)

The parser reported the beginning of a syntax parsing rule.

fn leave_rule(&mut self, rule: NodeRule, _node_ref: NodeRef)

The parser reported the finishing of a syntax parsing rule.

fn lift_node(&mut self, _node_ref: NodeRef)

The parser reported sibling node lifting to the current node.

fn syntax_error(&mut self, _error_ref: ErrorRef)

The parser reported a syntax error occurred during the rule parsing.