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use std::default::Default;
use syn::{Ident, LitStr, Variant};
use super::case_style::{CaseStyle, CaseStyleHelpers};
use super::metadata::{kw, VariantExt, VariantMeta};
use super::occurrence_error;
pub trait HasStrumVariantProperties {
fn get_variant_properties(&self) -> syn::Result<StrumVariantProperties>;
}
#[derive(Clone, Eq, PartialEq, Debug, Default)]
pub struct StrumVariantProperties {
pub disabled: Option<kw::disabled>,
pub default: Option<kw::default>,
pub ascii_case_insensitive: Option<bool>,
pub message: Option<LitStr>,
pub detailed_message: Option<LitStr>,
pub documentation: Vec<LitStr>,
pub string_props: Vec<(LitStr, LitStr)>,
serialize: Vec<LitStr>,
pub to_string: Option<LitStr>,
ident: Option<Ident>,
}
impl StrumVariantProperties {
fn ident_as_str(&self, case_style: Option<CaseStyle>) -> LitStr {
let ident = self.ident.as_ref().expect("identifier");
LitStr::new(&ident.convert_case(case_style), ident.span())
}
pub fn get_preferred_name(&self, case_style: Option<CaseStyle>) -> LitStr {
self.to_string.as_ref().cloned().unwrap_or_else(|| {
self.serialize
.iter()
.max_by_key(|s| s.value().len())
.cloned()
.unwrap_or_else(|| self.ident_as_str(case_style))
})
}
pub fn get_serializations(&self, case_style: Option<CaseStyle>) -> Vec<LitStr> {
let mut attrs = self.serialize.clone();
if let Some(to_string) = &self.to_string {
attrs.push(to_string.clone());
}
if attrs.is_empty() {
attrs.push(self.ident_as_str(case_style));
}
attrs
}
}
impl HasStrumVariantProperties for Variant {
fn get_variant_properties(&self) -> syn::Result<StrumVariantProperties> {
let mut output = StrumVariantProperties {
ident: Some(self.ident.clone()),
..Default::default()
};
let mut message_kw = None;
let mut detailed_message_kw = None;
let mut to_string_kw = None;
let mut disabled_kw = None;
let mut default_kw = None;
let mut ascii_case_insensitive_kw = None;
for meta in self.get_metadata()? {
match meta {
VariantMeta::Message { value, kw } => {
if let Some(fst_kw) = message_kw {
return Err(occurrence_error(fst_kw, kw, "message"));
}
message_kw = Some(kw);
output.message = Some(value);
}
VariantMeta::DetailedMessage { value, kw } => {
if let Some(fst_kw) = detailed_message_kw {
return Err(occurrence_error(fst_kw, kw, "detailed_message"));
}
detailed_message_kw = Some(kw);
output.detailed_message = Some(value);
}
VariantMeta::Documentation { value } => {
output.documentation.push(value);
}
VariantMeta::Serialize { value, .. } => {
output.serialize.push(value);
}
VariantMeta::ToString { value, kw } => {
if let Some(fst_kw) = to_string_kw {
return Err(occurrence_error(fst_kw, kw, "to_string"));
}
to_string_kw = Some(kw);
output.to_string = Some(value);
}
VariantMeta::Disabled(kw) => {
if let Some(fst_kw) = disabled_kw {
return Err(occurrence_error(fst_kw, kw, "disabled"));
}
disabled_kw = Some(kw);
output.disabled = Some(kw);
}
VariantMeta::Default(kw) => {
if let Some(fst_kw) = default_kw {
return Err(occurrence_error(fst_kw, kw, "default"));
}
default_kw = Some(kw);
output.default = Some(kw);
}
VariantMeta::AsciiCaseInsensitive { kw, value } => {
if let Some(fst_kw) = ascii_case_insensitive_kw {
return Err(occurrence_error(fst_kw, kw, "ascii_case_insensitive"));
}
ascii_case_insensitive_kw = Some(kw);
output.ascii_case_insensitive = Some(value);
}
VariantMeta::Props { props, .. } => {
output.string_props.extend(props);
}
}
}
Ok(output)
}
}
|
