Struct regex_syntax::hir::visitor::HeapVisitor

struct HeapVisitor<'a> {
    stack: Vec<(&'a Hir, Frame<'a>)>,
}

HeapVisitor visits every item in an Hir recursively using constant stack size and a heap size proportional to the size of the Hir.

Fields

stack: Vec<(&'a Hir, Frame<'a>)>

A stack of Hir nodes. This is roughly analogous to the call stack used in a typical recursive visitor.

Implementations

impl<'a> HeapVisitor<'a>

fn new() -> HeapVisitor<'a>

fn visit<V: Visitor>( &mut self, hir: &'a Hir, visitor: V, ) -> Result<V::Output, V::Err>

fn induct(&mut self, hir: &'a Hir) -> Option<Frame<'a>>

Build a stack frame for the given HIR if one is needed (which occurs if and only if there are child nodes in the HIR). Otherwise, return None.

fn pop(&self, induct: Frame<'a>) -> Option<Frame<'a>>

Pops the given frame. If the frame has an additional inductive step, then return it, otherwise return None.