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|
use std::collections::HashMap;
use rand::Rng;
use serde_json::Value;
use specs::{
Builder,
EntityBuilder
};
use super::components::{Visible, Blocking, Played};
macro_rules! assemblage {
($name:ident { $($arg:ident : $argt:ident ),* } ; $( $comp:expr ),* ) => {
#[derive(Debug, Clone, Default)]
pub struct $name {$(
pub $arg : $argt
)* }
impl Assemblage for $name {
fn build<'a>(&self, mut builder: EntityBuilder<'a>) -> EntityBuilder<'a>{
$(
let $arg = &self.$arg;
)*
$(
builder = builder.with($comp);
)*
builder
}
#[allow(unused_variables, unused_mut)]
fn init_from_json(&mut self, mut args: Vec<Value>, kwargs: HashMap<&str, Value>) {
$(
if args.len() > 0 {
let val = args.remove(0);
if let Some(actual_val) = unpack_json!($argt, val) {
self.$arg = actual_val;
}
}
)*
$(
if let Some(val) = kwargs.get(stringify!($arg)) {
if let Some(actual_val) = unpack_json!($argt, val) {
self.$arg = actual_val;
}
}
)*
}
}
}
}
macro_rules! unpack_json {
(String, $val: ident) => {
if let Some(txt) = $val.as_str(){
Some(txt.to_string())
} else {
None
}
}
}
pub trait Assemblage: Send + Sync {
fn build<'a>(&self, builder: EntityBuilder<'a>) -> EntityBuilder<'a>;
fn init_from_json(&mut self, args: Vec<Value>, kwargs: HashMap<&str, Value>);
}
assemblage!(Wall {}; Visible{sprite: "wall".to_string(), height: 2.0}, Blocking);
assemblage!(Grass { sprite : String}; Visible{sprite: sprite.to_string(), height: 0.1});
impl Grass {
pub fn new() -> Grass {
Grass {
sprite: ["grass1", "grass2", "grass3", "grass1", "grass2", "grass3", "ground"][rand::thread_rng().gen_range(0,7)].to_string()
}
}
}
assemblage!(Player {name: String}; Visible{sprite: "player".to_string(), height: 1.0}, Played::new(name.to_string()));
impl Player {
pub fn new(name: &str) -> Player {
Player { name: name.to_string()}
}
}
#[cfg(test)]
mod tests {
use super::*;
use serde_json::json;
use super::super::hashmap;
#[test]
fn test_assemblage_from_json() {
let mut p = Player::new("Joe");
assert_eq!(p.name, "Joe");
p.init_from_json(vec![json!("Bob"), json!("Mike")], HashMap::new());
assert_eq!(p.name, "Bob");
p.init_from_json(vec![], hashmap!("sprite" => json!("stone")));
assert_eq!(p.name, "Bob");
p.init_from_json(vec![], hashmap!("name" => json!("Teddy")));
assert_eq!(p.name, "Teddy");
p.init_from_json(vec![json!("Bill")], hashmap!("name" => json!("Stan")));
assert_eq!(p.name, "Stan");
}
}
|
