Enum PushOrPop 

pub enum PushOrPop {
    Push(Vec<State>),
    Pop,
    Neither,
}

An enum for manipulating the machine stack. Transition methods should return this information with a possible next state, so the parser knows how to proceed. The Push variant signifies a state should be pushed on top of the stack, Pop tells of the need to pop from the stack and Neither initiates a transition of the current state into another one.

Variants

Push(Vec<State>)

Causes Parser::parse to push the contained states on top of the parser stack.

Pop

Causes Parser::parse to pop the topmost state from the parser state stack.

Neither

Signifies to Parser::parse that nothing about the stack needs to change.

Trait Implementations

impl Debug for PushOrPop

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

Formats the value using the given formatter.