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schema_with attribute

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This commit is contained in:
Graham Esau 2020-05-15 17:11:28 +01:00
parent 9d951b34ce
commit 3fd316063a
15 changed files with 538 additions and 51 deletions
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46
schemars_derive/src/attr/mod.rs
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@ -22,7 +22,7 @@ pub struct Attrs {
#[derive(Debug)]
pub enum WithAttr {
Type(syn::Type),
_Function(syn::Path),
Function(syn::Path),
}
impl Attrs {
@ -74,14 +74,22 @@ impl Attrs {
if let Ok(ty) = parse_lit_into_ty(errors, attr_type, "with", &m.lit) {
match self.with {
Some(WithAttr::Type(_)) => duplicate_error(m),
Some(WithAttr::_Function(_)) => {
mutual_exclusive_error(m, "schema_with")
}
Some(WithAttr::Function(_)) => mutual_exclusive_error(m, "schema_with"),
None => self.with = Some(WithAttr::Type(ty)),
}
}
}
Meta(NameValue(m)) if m.path.is_ident("schema_with") => {
if let Ok(fun) = parse_lit_into_path(errors, attr_type, "schema_with", &m.lit) {
match self.with {
Some(WithAttr::Function(_)) => duplicate_error(m),
Some(WithAttr::Type(_)) => mutual_exclusive_error(m, "with"),
None => self.with = Some(WithAttr::Function(fun)),
}
}
}
Meta(_meta_item) => {
// TODO uncomment this for 0.8.0 (breaking change)
// https://github.com/GREsau/schemars/issues/18
@ -148,8 +156,8 @@ fn get_lit_str<'a>(
cx.error_spanned_by(
lit,
format!(
"expected {} attribute to be a string: `{} = \"...\"`",
attr_type, meta_item_name
"expected {} {} attribute to be a string: `{} = \"...\"`",
attr_type, meta_item_name, meta_item_name
),
);
Err(())
@ -167,7 +175,31 @@ fn parse_lit_into_ty(
parse_lit_str(string).map_err(|_| {
cx.error_spanned_by(
lit,
format!("failed to parse type: {} = {:?}", attr_type, string.value()),
format!(
"failed to parse type: `{} = {:?}`",
meta_item_name,
string.value()
),
)
})
}
fn parse_lit_into_path(
cx: &Ctxt,
attr_type: &'static str,
meta_item_name: &'static str,
lit: &syn::Lit,
) -> Result<syn::Path, ()> {
let string = get_lit_str(cx, attr_type, meta_item_name, lit)?;
parse_lit_str(string).map_err(|_| {
cx.error_spanned_by(
lit,
format!(
"failed to parse path: `{} = {:?}`",
meta_item_name,
string.value()
),
)
})
}