Trait FormatVariables 

pub trait FormatVariables {
    // Required method
    fn format_value(&self, variable: FormatVariable) -> Option<String>;

    // Provided methods
    fn format_value_by_name(&self, name: &str) -> Option<String> { ... }
    fn format_name_exists(
        &self,
        _scope: Option<char>,
        _name: &str,
    ) -> Option<bool> { ... }
    fn format_loop(
        &self,
        _scope: char,
        _body: &str,
        _count_only: bool,
    ) -> Option<String> { ... }
}

A source of values for supported format variables.

Required Methods

fn format_value(&self, variable: FormatVariable) -> Option<String>

Resolves a supported format variable to its rendered value.

Provided Methods

fn format_value_by_name(&self, name: &str) -> Option<String>

Resolves an arbitrary string-keyed variable name.

The default implementation delegates to the enum-based lookup. Runtime implementors can override this to support @user options and the full dynamic variable inventory.

fn format_name_exists(&self, _scope: Option<char>, _name: &str) -> Option<bool>

Checks whether a window or session name exists for the N: modifier.

scope is None or Some('w') for windows and Some('s') for sessions.

fn format_loop( &self, _scope: char, _body: &str, _count_only: bool, ) -> Option<String>

Expands runtime loop modifiers such as S, W, and P.

The default implementation leaves these modifiers unsupported.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl FormatVariables for FormatContext