Struct TreeBuilder 

pub struct TreeBuilder { /* private fields */ }

Builds a SyntaxTree as the parser walks the token stream.

Children accumulate in one flat buffer; closing a node drains its slice out of that buffer into the arena. This keeps TreeBuilder::checkpoint O(1), which matters because the Pratt expression parser takes one per operand.

Implementations

impl TreeBuilder

pub fn new() -> Self

pub fn start_node(&mut self, kind: SyntaxKind)

pub fn checkpoint(&self) -> Checkpoint

pub fn start_node_at(&mut self, checkpoint: Checkpoint, kind: SyntaxKind)

Open a node that retroactively contains everything added since checkpoint.

pub fn token(&mut self, token: Token)

pub fn finish_node(&mut self)

pub fn finish(self, source: String, errors: Vec<SyntaxError>) -> SyntaxTree

Close the builder, producing the finished tree.

Panics

Panics if any node is still open, or if the builder produced anything other than exactly one root node.

Trait Implementations

impl Debug for TreeBuilder

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

Formats the value using the given formatter.

impl Default for TreeBuilder

fn default() -> Self

Returns the “default value” for a type.