Struct OpenerScan 

pub struct OpenerScan { /* private fields */ }

The running state that turns is_conditional_opener into a positional decision: the operand-slot countdown and the \ifcsname body.

Feed the control words in document order through Self::visit — the parser in a pre-pass over the token stream, the linter walking COMMAND nodes in preorder.

The state is a running countdown, so whether a word is visited is itself a decision, and the two consumers make it differently on purpose (module doc). The rule is which question the filter answers. Tokens the document does not execute must not be visited at all — the linter withholds the whole span of a \def body, because a \let carried inside one must not arm the countdown for the code after it. Tokens that merely have no node to build are visited and then discarded from the result — the parser does this for expl3 regions, so an in-region \ifcsname still opens and closes its skip window for the words that follow.

Implementations

impl OpenerScan

pub fn new() -> Self

A fresh scan, at the start of a document.

pub fn visit(&mut self, name: &str) -> Word

Classify the next control word name (no leading backslash) and advance the state.

Trait Implementations

impl Clone for OpenerScan

fn clone(&self) -> OpenerScan

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for OpenerScan

impl Debug for OpenerScan

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

Formats the value using the given formatter.

impl Default for OpenerScan

fn default() -> OpenerScan

Returns the “default value” for a type.