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use std::collections::HashMap;
use rand::Rng;
use serde_json::{Value, json};
use serde::{Deserialize, Deserializer, de, Serialize};
use crate::{
parameter::{Parameter, ParameterType},
Template,
template::{EntityType},
Result as AnyResult,
aerr,
PResult,
perr
};
const MAX_NESTING: usize = 5;
#[derive(Debug, PartialEq, Clone)]
pub enum ParameterExpression {
Constant(Parameter),
List(Vec<ParameterExpression>),
#[allow(dead_code)] // rustc bug does not know that this variant is used: https://github.com/rust-lang/rust/issues/68408
Template{name: EntityType, kwargs: HashMap<String, ParameterExpression>, save: Option<bool>},
Argument(String),
Random(Vec<ParameterExpression>),
Concat(Vec<ParameterExpression>),
If(Box<ParameterExpression>, Box<ParameterExpression>, Box<ParameterExpression>),
TemplateSelf,
TemplateName
}
impl ParameterExpression {
pub fn evaluate(&self, arguments: &HashMap<&str, Parameter>, template: &Template) -> Option<Parameter> {
self.evaluate_(arguments, template, 0)
}
fn evaluate_(&self, arguments: &HashMap<&str, Parameter>, template: &Template, nesting: usize) -> Option<Parameter> {
if nesting > MAX_NESTING {
return None;
}
match self {
Self::Constant(val) => {
Some(val.clone())
}
Self::List(values) => {
Some(Parameter::List(values.iter().map(|v| v.evaluate_(arguments, template, nesting+1)).collect::<Option<Vec<Parameter>>>()?))
}
Self::Template{name, kwargs, save} => {
Some(Parameter::Template(Template{
name: name.clone(),
args: Vec::new(),
save: *save,
kwargs: kwargs
.iter()
.map(
|(k, v)|
Some((k.clone(), v.evaluate_(arguments, template, nesting+1)?)))
.collect::<Option<HashMap<String, Parameter>>>()?
}))
}
Self::Argument(argname) => {
Some(arguments.get(argname.as_str())?.clone())
}
Self::Random(options) => {
let r = rand::thread_rng().gen_range(0, options.len());
options[r].evaluate_(arguments, template, nesting + 1)
}
Self::Concat(options) => {
let mut string = String::new();
for option in options {
if let Parameter::String(s) = option.evaluate_(arguments, template, nesting+1)? {
string.push_str(&s);
} else {
return None;
}
}
Some(Parameter::String(string))
}
Self::If(condition, thenval, elseval) => {
if let Parameter::Bool(b) = condition.evaluate_(arguments, template, nesting+1)? {
if b {
thenval.evaluate_(arguments, template, nesting+1)
} else {
elseval.evaluate_(arguments, template, nesting+1)
}
} else {
None
}
}
Self::TemplateSelf => Some(Parameter::Template(template.clone())),
Self::TemplateName => Some(Parameter::String(template.name.0.clone())),
}
}
pub fn from_json(value: &Value) -> PResult<Self> {
if !value.is_array() {
return Ok(Self::Constant(Parameter::guess_from_json(value)?));
}
let paramvalue = value.get(1).ok_or(perr!("index 1 not in component parameter"))?;
let typename = value.get(0).ok_or(perr!("index 0 not in component parameter"))?.as_str().ok_or(perr!("compparam type not a string"))?;
match typename {
"string" | "int" | "float" | "bool" | "pos" => {
let paramtype = ParameterType::from_str(typename).expect(&format!("unknown parameter type {:?}", typename));
Ok(Self::Constant(Parameter::from_typed_json(paramtype, paramvalue)?))
}
"list" => {
let values = paramvalue.as_array().ok_or(perr!("random argument not an array"))?;
let mut entries = Vec::new();
for entry in values {
entries.push(Self::from_json(entry)?)
}
Ok(Self::List(entries))
}
"template" => {
match paramvalue {
Value::String(s) => Ok(Self::Template{
name: EntityType(s.clone()),
kwargs: HashMap::new(),
save: None
}),
Value::Object(o) => {
let name = EntityType(o.get("type").ok_or(perr!("template doesn't have 'type'"))?.as_str().ok_or(perr!("template type not a string"))?.to_string());
let mut kwargs = HashMap::new();
for (key, arg) in o.get("kwargs").unwrap_or(&json!({})).as_object().ok_or(perr!("template kwargs not a json object"))? {
kwargs.insert(key.to_string(), Self::from_json(arg)?);
}
let save = match o.get("save") {
Some(Value::Bool(b)) if *b => Some(true),
Some(Value::Bool(_b)) => Some(false),
None => None,
_ => {return Err(perr!("save not a bool"))}
};
Ok(Self::Template{name, kwargs, save})
}
_ => return Err(perr!("invalid template {:?}", paramvalue))
}
}
"A" | "arg" => {
let argname = paramvalue.as_str().ok_or(perr!("argument parameter not a string"))?.to_string();
Ok(Self::Argument(argname))
}
"random" => {
let optionvalues = paramvalue.as_array().ok_or(perr!("random argument not an array"))?;
let mut options = Vec::new();
for option in optionvalues {
options.push(Self::from_json(option)?)
}
Ok(Self::Random(options))
}
"concat" => {
let values = paramvalue.as_array().ok_or(perr!("concat argument not an array"))?;
let mut options = Vec::new();
for option in values {
options.push(Self::from_json(option)?)
}
Ok(Self::Concat(options))
}
"if" => {
Ok(Self::If(
Box::new(Self::from_json(paramvalue.get(0).ok_or(perr!("if does not have condition"))?)?),
Box::new(Self::from_json(paramvalue.get(1).ok_or(perr!("if does not have then value"))?)?),
Box::new(Self::from_json(paramvalue.get(2).ok_or(perr!("if does not have else value"))?)?)
))
}
"self" => Ok(Self::TemplateSelf),
"name" => Ok(Self::TemplateName),
_ => Err(perr!("unknown compparam type '{}'", typename))
}
}
#[allow(dead_code)]
pub fn get_type(&self, arguments: &[(String, ParameterType, Option<Parameter>)]) -> AnyResult<ParameterType>{
Ok(match self {
Self::Constant(param) => param.paramtype(),
Self::List(_) => ParameterType::List,
Self::Template{name: _, kwargs: _, save: _} => ParameterType::Template,
Self::Argument(argname) => arguments.iter().find(|(n, _t, _d)| n == argname).ok_or(aerr!("unknown argument name {} in {:?}", argname, arguments))?.1,
Self::Random(options) => {
let typ: ParameterType = options.get(0).ok_or(aerr!("random has no options"))?.get_type(arguments)?;
for param in options {
if param.get_type(arguments)? != typ {
return Err(aerr!("inconsistent parameter types in random"));
}
}
typ
},
Self::If(condition, thenval, elseval) => {
if condition.get_type(arguments)? != ParameterType::Bool {
return Err(aerr!("if condition is not a bool"));
}
let typ: ParameterType = thenval.get_type(arguments)?;
if elseval.get_type(arguments)? != typ {
return Err(aerr!("inconsistent parameter types in if"));
}
typ
},
Self::Concat(_s) => ParameterType::String,
Self::TemplateSelf => ParameterType::Template,
Self::TemplateName => ParameterType::String
})
}
}
// impl Serialize for ParameterExpression {
// fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
// where S: Serializer {
// self.to_json().serialize(serializer)
// }
// }
impl<'de> Deserialize<'de> for ParameterExpression {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de> {
Self::from_json(&Value::deserialize(deserializer)?).map_err(|e| de::Error::custom(e.text))
}
}
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