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use fluent_syntax::ast::InlineExpression;
use std::error::Error;
#[derive(Debug, PartialEq, Clone)]
pub enum ReferenceKind {
Function {
id: String,
},
Message {
id: String,
attribute: Option<String>,
},
Term {
id: String,
attribute: Option<String>,
},
Variable {
id: String,
},
}
impl<T> From<&InlineExpression<T>> for ReferenceKind
where
T: ToString,
{
fn from(exp: &InlineExpression<T>) -> Self {
match exp {
InlineExpression::FunctionReference { id, .. } => Self::Function {
id: id.name.to_string(),
},
InlineExpression::MessageReference { id, attribute } => Self::Message {
id: id.name.to_string(),
attribute: attribute.as_ref().map(|i| i.name.to_string()),
},
InlineExpression::TermReference { id, attribute, .. } => Self::Term {
id: id.name.to_string(),
attribute: attribute.as_ref().map(|i| i.name.to_string()),
},
InlineExpression::VariableReference { id, .. } => Self::Variable {
id: id.name.to_string(),
},
_ => unreachable!(),
}
}
}
#[derive(Debug, PartialEq, Clone)]
pub enum ResolverError {
Reference(ReferenceKind),
NoValue(String),
MissingDefault,
Cyclic,
TooManyPlaceables,
}
impl std::fmt::Display for ResolverError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Self::Reference(exp) => match exp {
ReferenceKind::Function { id } => write!(f, "Unknown function: {}()", id),
ReferenceKind::Message {
id,
attribute: None,
} => write!(f, "Unknown message: {}", id),
ReferenceKind::Message {
id,
attribute: Some(attribute),
} => write!(f, "Unknown attribute: {}.{}", id, attribute),
ReferenceKind::Term {
id,
attribute: None,
} => write!(f, "Unknown term: -{}", id),
ReferenceKind::Term {
id,
attribute: Some(attribute),
} => write!(f, "Unknown attribute: -{}.{}", id, attribute),
ReferenceKind::Variable { id } => write!(f, "Unknown variable: ${}", id),
},
Self::NoValue(id) => write!(f, "No value: {}", id),
Self::MissingDefault => f.write_str("No default"),
Self::Cyclic => f.write_str("Cyclical dependency detected"),
Self::TooManyPlaceables => f.write_str("Too many placeables"),
}
}
}
impl<T> From<&InlineExpression<T>> for ResolverError
where
T: ToString,
{
fn from(exp: &InlineExpression<T>) -> Self {
Self::Reference(exp.into())
}
}
impl Error for ResolverError {}