Trait Render 

pub trait Render:
    Send
    + Sync
    + 'static {
    // Required methods
    fn template(&self, name: &str) -> Option<TemplateId>;
    fn render(
        &self,
        template: TemplateId,
        view: &dyn View,
        out: &mut Output<'_>,
    ) -> Result<(), RenderError>;
}

A template engine.

use web_net::{Output, Render, RenderError, TemplateId, Value, View};

/// Writes the view's `title` field and nothing else.
struct TitleOnly;

impl Render for TitleOnly {
    fn template(&self, name: &str) -> Option<TemplateId> {
        (name == "title").then_some(TemplateId(0))
    }
    fn render(&self, _t: TemplateId, view: &dyn View, out: &mut Output<'_>) -> Result<(), RenderError> {
        let key = view.shape().key("title").ok_or(RenderError::new("demo.no_title"))?;
        match view.get(key) {
            Value::Text(t) => out.write(t.as_bytes()), // a real engine escapes here
            _ => Err(RenderError::new("demo.not_text")),
        }
    }
}

Required Methods

fn template(&self, name: &str) -> Option<TemplateId>

Resolves a template name. Called at build time for every template a route names, so an unknown name stops the application from starting.

fn render( &self, template: TemplateId, view: &dyn View, out: &mut Output<'_>, ) -> Result<(), RenderError>

Renders template against view into out.

Errors

A RenderError; the request is answered with a 500 error page and the detail goes to the events, never to the visitor.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors