Struct LineBuilder 

pub struct LineBuilder { /* private fields */ }

Builder for formatted output lines.

Constructs lines following the column layout: <indent><step><gap><symbol><gap><content>...<successors>

Implementations

impl LineBuilder

pub fn new(step_width: usize) -> Self

Create a new line builder with the given step width.

pub fn instruction_prefix(&self, step: u16, symbol: Symbol) -> String

Build an instruction line prefix: <step> <symbol>

pub fn subline_prefix(&self, symbol: Symbol) -> String

Build a sub-line prefix (blank step area): <symbol>

pub fn backtrack_line(&self, step: u16) -> String

Build a backtrack line: <step> ❮❮❮

pub fn pad_successors(&self, base: String, successors: &str) -> String

Pad content to total width and append successors.

Ensures at least 2 spaces between content and successors.