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use super::scope::Scope;
use super::{ResolveValue, ResolverError, WriteValue};
use std::borrow::Borrow;
use std::fmt;
use fluent_syntax::ast;
use fluent_syntax::unicode::{unescape_unicode, unescape_unicode_to_string};
use crate::entry::GetEntry;
use crate::memoizer::MemoizerKind;
use crate::resource::FluentResource;
use crate::types::FluentValue;
impl<'p> WriteValue for ast::InlineExpression<&'p str> {
fn write<'scope, 'errors, W, R, M>(
&'scope self,
w: &mut W,
scope: &mut Scope<'scope, 'errors, R, M>,
) -> fmt::Result
where
W: fmt::Write,
R: Borrow<FluentResource>,
M: MemoizerKind,
{
match self {
Self::StringLiteral { value } => unescape_unicode(w, value),
Self::MessageReference { id, attribute } => {
if let Some(msg) = scope.bundle.get_entry_message(id.name) {
if let Some(attr) = attribute {
msg.attributes
.iter()
.find_map(|a| {
if a.id.name == attr.name {
Some(scope.track(w, &a.value, self))
} else {
None
}
})
.unwrap_or_else(|| scope.write_ref_error(w, self))
} else {
msg.value
.as_ref()
.map(|value| scope.track(w, value, self))
.unwrap_or_else(|| {
scope.add_error(ResolverError::NoValue(id.name.to_string()));
w.write_char('{')?;
self.write_error(w)?;
w.write_char('}')
})
}
} else {
scope.write_ref_error(w, self)
}
}
Self::NumberLiteral { value } => FluentValue::try_number(*value).write(w, scope),
Self::TermReference {
id,
attribute,
arguments,
} => {
let (_, resolved_named_args) = scope.get_arguments(arguments.as_ref());
scope.local_args = Some(resolved_named_args);
let result = scope
.bundle
.get_entry_term(id.name)
.and_then(|term| {
if let Some(attr) = attribute {
term.attributes.iter().find_map(|a| {
if a.id.name == attr.name {
Some(scope.track(w, &a.value, self))
} else {
None
}
})
} else {
Some(scope.track(w, &term.value, self))
}
})
.unwrap_or_else(|| scope.write_ref_error(w, self));
scope.local_args = None;
result
}
Self::FunctionReference { id, arguments } => {
let (resolved_positional_args, resolved_named_args) =
scope.get_arguments(Some(arguments));
let func = scope.bundle.get_entry_function(id.name);
if let Some(func) = func {
let result = func(resolved_positional_args.as_slice(), &resolved_named_args);
if let FluentValue::Error = result {
self.write_error(w)
} else {
w.write_str(&result.as_string(scope))
}
} else {
scope.write_ref_error(w, self)
}
}
Self::VariableReference { id } => {
let args = scope.local_args.as_ref().or(scope.args);
if let Some(arg) = args.and_then(|args| args.get(id.name)) {
arg.write(w, scope)
} else {
if scope.local_args.is_none() {
scope.add_error(self.into());
}
w.write_char('{')?;
self.write_error(w)?;
w.write_char('}')
}
}
Self::Placeable { expression } => expression.write(w, scope),
}
}
fn write_error<W>(&self, w: &mut W) -> fmt::Result
where
W: fmt::Write,
{
match self {
Self::MessageReference {
id,
attribute: Some(attribute),
} => write!(w, "{}.{}", id.name, attribute.name),
Self::MessageReference {
id,
attribute: None,
} => w.write_str(id.name),
Self::TermReference {
id,
attribute: Some(attribute),
..
} => write!(w, "-{}.{}", id.name, attribute.name),
Self::TermReference {
id,
attribute: None,
..
} => write!(w, "-{}", id.name),
Self::FunctionReference { id, .. } => write!(w, "{}()", id.name),
Self::VariableReference { id } => write!(w, "${}", id.name),
_ => unreachable!(),
}
}
}
impl<'p> ResolveValue for ast::InlineExpression<&'p str> {
fn resolve<'source, 'errors, R, M>(
&'source self,
scope: &mut Scope<'source, 'errors, R, M>,
) -> FluentValue<'source>
where
R: Borrow<FluentResource>,
M: MemoizerKind,
{
match self {
Self::StringLiteral { value } => unescape_unicode_to_string(value).into(),
Self::NumberLiteral { value } => FluentValue::try_number(*value),
Self::VariableReference { id } => {
let args = scope.local_args.as_ref().or(scope.args);
if let Some(arg) = args.and_then(|args| args.get(id.name)) {
arg.clone()
} else {
if scope.local_args.is_none() {
scope.add_error(self.into());
}
FluentValue::Error
}
}
_ => {
let mut result = String::new();
self.write(&mut result, scope).expect("Failed to write");
result.into()
}
}
}
}