proffer 0.5.0

Rust code generation
Documentation 
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//!
//!
//! Create a associated type for traits and trait implementations.
//!

use serde::{Deserialize, Serialize};
use tera::{Context, Tera};

use crate::traits::SrcCode;

/// Represent the declaration of a associated type in a trait
#[derive(Serialize, Deserialize, Default, Clone)]
pub struct AssociatedTypeDeclaration {
    pub(crate) name: String,
    pub(crate) traits: Vec<String>,
}

impl AssociatedTypeDeclaration {
    /// Create a new `AssociatedTypeDeclaration`
    pub fn new<S: ToString>(name: S) -> Self {
        let mut g = Self::default();
        g.name = name.to_string();
        g
    }
    /// Set the trait bounds of this associated type
    pub fn add_trait_bounds<S: ToString>(&mut self, traits: Vec<S>) -> &mut Self {
        self.traits.extend(traits.iter().map(|t| t.to_string()));
        self
    }
}

impl SrcCode for AssociatedTypeDeclaration {
    fn generate(&self) -> String {
        let template = r#"type {{ self.name }}{% if has_traits %}: {{ self.traits | join(sep=" + ") }}{% endif %};
        "#;
        let mut context = Context::new();
        context.insert("self", &self);
        context.insert("has_traits", &!self.traits.is_empty());
        Tera::one_off(template, &context, false).unwrap()
    }
}

/// Represent the definition of a associated type in a trait implementation
#[derive(Serialize, Deserialize, Clone)]
pub struct AssociatedTypeDefinition {
    pub(crate) name: String,
    pub(crate) implementer: String,
}

impl AssociatedTypeDefinition {
    /// Create a new `AssociatedTypeDefinition`
    pub fn new<N: ToString, I: ToString>(name: N, implementer: I) -> Self {
        AssociatedTypeDefinition {
            name: name.to_string(),
            implementer: implementer.to_string()
        }
    }
}

impl SrcCode for AssociatedTypeDefinition {
    fn generate(&self) -> String {
        let template = r#"type {{ self.name }} = {{ self.implementer }};
        "#;
        let mut context = Context::new();
        context.insert("self", &self);
        Tera::one_off(template, &context, false).unwrap()
    }
}