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//! Methods on values.
use super::{Args, Machine, Regex, StrExt, Value};
use crate::diag::{At, TypResult};
use crate::syntax::Span;
use crate::util::EcoString;
/// Call a method on a value.
pub fn call(
vm: &mut Machine,
value: Value,
method: &str,
mut args: Args,
span: Span,
) -> TypResult<Value> {
let name = value.type_name();
let missing = || Err(missing_method(name, method)).at(span);
let output = match value {
Value::Str(string) => match method {
"len" => Value::Int(string.len() as i64),
"trim" => Value::Str(string.trim().into()),
"split" => Value::Array(string.split(args.eat()?)),
_ => missing()?,
},
Value::Array(array) => match method {
"len" => Value::Int(array.len()),
"slice" => {
let start = args.expect("start")?;
let mut end = args.eat()?;
if end.is_none() {
end = args.named("count")?.map(|c: i64| start + c);
}
Value::Array(array.slice(start, end).at(span)?)
}
"map" => Value::Array(array.map(vm, args.expect("function")?)?),
"filter" => Value::Array(array.filter(vm, args.expect("function")?)?),
"flatten" => Value::Array(array.flatten()),
"find" => array.find(args.expect("value")?).map_or(Value::None, Value::Int),
"join" => {
let sep = args.eat()?;
let last = args.named("last")?;
array.join(sep, last).at(span)?
}
"sorted" => Value::Array(array.sorted().at(span)?),
_ => missing()?,
},
Value::Dict(dict) => match method {
"len" => Value::Int(dict.len()),
"keys" => Value::Array(dict.keys()),
"values" => Value::Array(dict.values()),
"pairs" => Value::Array(dict.map(vm, args.expect("function")?)?),
_ => missing()?,
},
Value::Func(func) => match method {
"with" => Value::Func(func.clone().with(args.take())),
_ => missing()?,
},
Value::Args(args) => match method {
"positional" => Value::Array(args.to_positional()),
"named" => Value::Dict(args.to_named()),
_ => missing()?,
},
Value::Dyn(dynamic) => {
if let Some(regex) = dynamic.downcast::<Regex>() {
match method {
"matches" => {
Value::Bool(regex.matches(&args.expect::<EcoString>("text")?))
}
_ => missing()?,
}
} else {
missing()?
}
}
_ => missing()?,
};
args.finish()?;
Ok(output)
}
/// Call a mutating method on a value.
pub fn call_mut(
value: &mut Value,
method: &str,
mut args: Args,
span: Span,
) -> TypResult<()> {
let name = value.type_name();
let missing = || Err(missing_method(name, method)).at(span);
match value {
Value::Array(array) => match method {
"push" => array.push(args.expect("value")?),
"pop" => array.pop().at(span)?,
"insert" => {
array.insert(args.expect("index")?, args.expect("value")?).at(span)?
}
"remove" => array.remove(args.expect("index")?).at(span)?,
_ => missing()?,
},
Value::Dict(dict) => match method {
"remove" => dict.remove(&args.expect("key")?).at(span)?,
_ => missing()?,
},
_ => missing()?,
}
args.finish()?;
Ok(())
}
/// Whether a specific method is mutating.
pub fn is_mutating(method: &str) -> bool {
matches!(method, "push" | "pop" | "insert" | "remove")
}
/// The missing method error message.
#[cold]
fn missing_method(type_name: &str, method: &str) -> String {
format!("type {type_name} has no method `{method}`")
}
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