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|
use std::str::FromStr;
use knuffel::errors::DecodeError;
use miette::miette;
use regex::Regex;
#[derive(Debug, Clone, Copy, PartialEq)]
pub struct Percent(pub f64);
// MIN and MAX generics are only used during parsing to check the value.
#[derive(Debug, Default, Clone, Copy, PartialEq)]
pub struct FloatOrInt<const MIN: i32, const MAX: i32>(pub f64);
/// `Regex` that implements `PartialEq` by its string form.
#[derive(Debug, Clone)]
pub struct RegexEq(pub Regex);
impl PartialEq for RegexEq {
fn eq(&self, other: &Self) -> bool {
self.0.as_str() == other.0.as_str()
}
}
impl Eq for RegexEq {}
impl FromStr for RegexEq {
type Err = <Regex as FromStr>::Err;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Regex::from_str(s).map(Self)
}
}
impl FromStr for Percent {
type Err = miette::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let Some((value, empty)) = s.split_once('%') else {
return Err(miette!("value must end with '%'"));
};
if !empty.is_empty() {
return Err(miette!("trailing characters after '%' are not allowed"));
}
let value: f64 = value.parse().map_err(|_| miette!("error parsing value"))?;
Ok(Percent(value / 100.))
}
}
impl<S: knuffel::traits::ErrorSpan, const MIN: i32, const MAX: i32> knuffel::DecodeScalar<S>
for FloatOrInt<MIN, MAX>
{
fn type_check(
type_name: &Option<knuffel::span::Spanned<knuffel::ast::TypeName, S>>,
ctx: &mut knuffel::decode::Context<S>,
) {
if let Some(type_name) = &type_name {
ctx.emit_error(DecodeError::unexpected(
type_name,
"type name",
"no type name expected for this node",
));
}
}
fn raw_decode(
val: &knuffel::span::Spanned<knuffel::ast::Literal, S>,
ctx: &mut knuffel::decode::Context<S>,
) -> Result<Self, DecodeError<S>> {
match &**val {
knuffel::ast::Literal::Int(ref value) => match value.try_into() {
Ok(v) => {
if (MIN..=MAX).contains(&v) {
Ok(FloatOrInt(f64::from(v)))
} else {
ctx.emit_error(DecodeError::conversion(
val,
format!("value must be between {MIN} and {MAX}"),
));
Ok(FloatOrInt::default())
}
}
Err(e) => {
ctx.emit_error(DecodeError::conversion(val, e));
Ok(FloatOrInt::default())
}
},
knuffel::ast::Literal::Decimal(ref value) => match value.try_into() {
Ok(v) => {
if (f64::from(MIN)..=f64::from(MAX)).contains(&v) {
Ok(FloatOrInt(v))
} else {
ctx.emit_error(DecodeError::conversion(
val,
format!("value must be between {MIN} and {MAX}"),
));
Ok(FloatOrInt::default())
}
}
Err(e) => {
ctx.emit_error(DecodeError::conversion(val, e));
Ok(FloatOrInt::default())
}
},
_ => {
ctx.emit_error(DecodeError::unsupported(
val,
"Unsupported value, only numbers are recognized",
));
Ok(FloatOrInt::default())
}
}
}
}
pub fn expect_only_children<S>(
node: &knuffel::ast::SpannedNode<S>,
ctx: &mut knuffel::decode::Context<S>,
) where
S: knuffel::traits::ErrorSpan,
{
if let Some(type_name) = &node.type_name {
ctx.emit_error(DecodeError::unexpected(
type_name,
"type name",
"no type name expected for this node",
));
}
for val in node.arguments.iter() {
ctx.emit_error(DecodeError::unexpected(
&val.literal,
"argument",
"no arguments expected for this node",
))
}
for name in node.properties.keys() {
ctx.emit_error(DecodeError::unexpected(
name,
"property",
"no properties expected for this node",
))
}
}
pub fn parse_arg_node<S: knuffel::traits::ErrorSpan, T: knuffel::traits::DecodeScalar<S>>(
name: &str,
node: &knuffel::ast::SpannedNode<S>,
ctx: &mut knuffel::decode::Context<S>,
) -> Result<T, DecodeError<S>> {
let mut iter_args = node.arguments.iter();
let val = iter_args.next().ok_or_else(|| {
DecodeError::missing(node, format!("additional argument `{name}` is required"))
})?;
let value = knuffel::traits::DecodeScalar::decode(val, ctx)?;
if let Some(val) = iter_args.next() {
ctx.emit_error(DecodeError::unexpected(
&val.literal,
"argument",
"unexpected argument",
));
}
for name in node.properties.keys() {
ctx.emit_error(DecodeError::unexpected(
name,
"property",
format!("unexpected property `{}`", name.escape_default()),
));
}
for child in node.children() {
ctx.emit_error(DecodeError::unexpected(
child,
"node",
format!("unexpected node `{}`", child.node_name.escape_default()),
));
}
Ok(value)
}
|
