sita 0.3.0

Sita: static site generator (SSG) for Markdown and HTML
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//! State management abstraction.
//!
//! This can use HTML, JSON, TOML, YAML, etc.
//!
//! This can be expanded for potential future formats.

use std::any::Any;
use crate::state::state_enum::StateEnum;

pub trait StateTrait: std::fmt::Debug {

    /// Convert from the specific to any type.
    #[allow(dead_code)]
    fn as_any(&self) -> &dyn Any;

    /// Convert from the specific to the corresponding enum.
    fn to_state_enum(&self) -> StateEnum;

    /// Does the state contain the key?
    fn contains_key(&self, key: &str) -> bool;

    /// Insert the key and value.
    fn insert(&mut self, key: String, value: String) -> ();

    /// If the key doesn't exist then insert the key and value.
    #[allow(dead_code)]
    fn contains_key_or_insert(&mut self, key: String, value: String) -> () {
        if !self.contains_key(&key) {
            self.insert(key, value);
        }
    }

}