Trait Substitute 

pub trait Substitute {
    // Required methods
    fn substitute(self, key: &str, value: &str) -> String;
    fn substitute_all<'a>(
        self,
        substitutions: impl IntoIterator<Item = (&'a str, &'a str)>,
    ) -> String;
}

Extension trait for placeholder substitution on system prompt strings.

Provides simple {key} placeholder replacement after building a system prompt. Unmatched placeholders are left as-is.

Example

use llm_coding_tools_core::Substitute;

let text = "Available agents: {agents}".to_string();
let result = text
    .substitute("agents", "code-review, research")
    .substitute("missing", "ignored");

assert_eq!(result, "Available agents: code-review, research");

Required Methods

fn substitute(self, key: &str, value: &str) -> String

Replaces {key} placeholder with the given value.

Returns a new String with the substitution applied. If the placeholder is not found, returns the string unchanged.

fn substitute_all<'a>( self, substitutions: impl IntoIterator<Item = (&'a str, &'a str)>, ) -> String

Replaces multiple {key} placeholders with their values.

Accepts an iterator of (key, value) pairs.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl Substitute for String

fn substitute(self, key: &str, value: &str) -> String

fn substitute_all<'a>( self, substitutions: impl IntoIterator<Item = (&'a str, &'a str)>, ) -> String

Implementors