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|
use serde_json::{Value, json};
use crate::{
Template,
components::interactable::Interactable,
Pos,
PResult,
perr
};
macro_rules! parameters {
($($name: ident ($typ: ty) $stringname: ident, $v: ident ($fromjson: expr) ($tojson: expr));*;) => {
#[derive(Debug, PartialEq, Clone)]
pub enum Parameter {
$(
$name($typ),
)*
}
impl Parameter {
pub fn from_typed_json(typ: ParameterType, val: &Value) -> PResult<Parameter>{
match typ {
$(
ParameterType::$name => Ok(Self::$name({
let $v = val;
$fromjson
})),
)*
}
}
pub fn paramtype(&self) -> ParameterType {
match self {
$(
Self::$name(_) => ParameterType::$name,
)*
}
}
pub fn to_json(&self) -> Value {
match self {
$(
Self::$name($v) => $tojson,
)*
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ParameterType {
$(
$name,
)*
}
impl ParameterType {
pub fn from_str(typename: &str) -> Option<Self>{
match typename {
$(
stringify!($stringname) => Some(Self::$name),
)*
_ => None
}
}
}
}
}
parameters!(
String (String) string, v (v.as_str().ok_or(perr!("{:?} not a string", v))?.to_string()) (json!(v));
Int (i64) int, v (v.as_i64().ok_or(perr!("{:?} not an int", v))?) (json!(v));
Pos (Pos) pos, v (Pos::from_json(v).ok_or(perr!("{:?} not a pos", v))?) (json!(v));
Float (f64) float, v (v.as_f64().ok_or(perr!("{:?} not an float", v))?) (json!(v));
Template (Template) template, v (Template::from_json(v)?) (json!(["template", v.to_json()]));
Interaction (Interactable) interaction, _v (Interactable::from_json(_v).ok_or(perr!("{:?} not an interactable", _v))?) (panic!("interactions can't be serialized"));
Bool (bool) bool, v (v.as_bool().ok_or(perr!("{:?} not a bool", v))?) (json!(v));
List (Vec<Parameter>) list, v
({
v
.as_array().ok_or(perr!("{:?} not an array", v))?
.iter()
.map(|item| Parameter::guess_from_json(item))
.collect::<PResult<Vec<Parameter>>>()?
})
(json!(["list", v.iter().map(Parameter::to_json).collect::<Vec<Value>>()]));
);
impl Parameter {
#[allow(dead_code)]
pub fn string(string: &str) -> Self {
Self::String(string.to_string())
}
pub fn guess_from_json(val: &Value) -> PResult<Parameter> {
if let Some(arr) = val.as_array() {
if arr.len() == 2 && arr[0].is_string() {
let typestr = arr[0].as_str().unwrap();
let typ = ParameterType::from_str(typestr).ok_or(perr!("invalid parameter type {}", typestr))?;
return Self::from_typed_json(typ, &arr[1]);
}
}
let typ =
if val.is_string() {
ParameterType::String
} else if val.is_u64() || val.is_i64() {
ParameterType::Int
} else if val.is_f64() {
ParameterType::Float
} else if val.is_boolean(){
ParameterType::Bool
} else if val.is_object(){
ParameterType::Template
} else {
return Err(perr!("can't guess the type of parameter {:?}", val));
};
Self::from_typed_json(typ, val)
}
}
#[cfg(test)]
mod tests {
use super::*;
use serde_json::json;
macro_rules! gfj { // guess from json
($($j:tt)*) => {Parameter::guess_from_json(&json!($($j)*)).unwrap()}
}
#[test]
fn can_guess_json() {
Parameter::guess_from_json(&json!(3)).unwrap();
}
#[test]
fn guess_json() {
assert_eq!(gfj!("charles"), Parameter::string("charles"));
assert_eq!(gfj!("1"), Parameter::string("1"));
assert_eq!(gfj!(""), Parameter::string(""));
assert_eq!(gfj!(3), Parameter::Int(3));
assert_eq!(gfj!(-3), Parameter::Int(-3));
assert_eq!(gfj!(0), Parameter::Int(0));
assert_eq!(gfj!(-0), Parameter::Int(0));
assert_eq!(gfj!(3.5), Parameter::Float(3.5));
assert_eq!(gfj!(3.0), Parameter::Float(3.0));
assert_eq!(gfj!(-3.0), Parameter::Float(-3.0));
assert_eq!(gfj!(0.0), Parameter::Float(0.0));
assert_eq!(gfj!(-0.0), Parameter::Float(0.0));
assert_eq!(gfj!(true), Parameter::Bool(true));
assert_eq!(gfj!(["int", 3]), Parameter::Int(3));
}
#[test]
fn guess_json_none() {
assert!(Parameter::guess_from_json(&json!([2, 5])).is_none());
assert!(Parameter::guess_from_json(&json!({"hello": "world"})).is_none());
}
#[test]
fn parse_list() {
assert_eq!(
gfj!(["list", [5, 3, 1, 2]]),
Parameter::List(vec![
Parameter::Int(5),
Parameter::Int(3),
Parameter::Int(1),
Parameter::Int(2)
])
);
assert_eq!(
gfj!(["list", [5, 3.0, "Hello", true]]),
Parameter::List(vec![
Parameter::Int(5),
Parameter::Float(3.0),
Parameter::string("Hello"),
Parameter::Bool(true)
])
);
}
}
|
