price_checker/src/parser.rs

pub mod darty;
pub mod fnac;
pub mod du_bruit_dans_la_cuisine;
pub mod ldlc;
pub mod amazon;

use scraper::Html;
use crate::price_result::PriceResult;
use arraygen::Arraygen;
use url::Url;
use anyhow::Result;

pub trait Parser{
	/// Create the parser
	fn new() -> Result<Self> where Self : Sized;
	/// Get the name
	fn name() -> &'static str where Self : Sized;
}

/// Trait needed to get price from a specific website
pub trait PriceParser : Parser{
	/// Indicate if it can parse this URL
	fn can_parse(&self, url : &Url) -> bool;
	/// Parse the html into a price
	fn parse(&self, html : &Html) -> Result<PriceResult>;
}

// @todo Macro générateur liste et tests

macro_rules! gen_list {
	( $([$module:ident::$name:ident : $($array:ident),*]),* ) => {
		#[derive(Arraygen, Debug)]
		#[gen_array(pub fn get_price: & dyn PriceParser)]
		pub struct List {
			$(
				$(
					#[in_array($array)]
				)*
				$module: $module::$name
			),*
		}


		impl List {
			/// Create the list
			pub fn new() -> Result<Self> {
				Ok(List {
					$(
						$module: $module::$name::new()?
					),*
				})
			}
		}

	};
}

gen_list!(
	[darty::Darty : get_price],
	[fnac::Fnac : get_price],
	[du_bruit_dans_la_cuisine::DuBruitDansLaCuisine : get_price],
	[ldlc::LDLC : get_price],
	[amazon::Amazon : get_price]
);

#[test]
fn test_parser_list() {
	let parser_list = List::new().unwrap();
	assert_eq!(parser_list.get_price().len(), 5);
}