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refactor serde parsing for later reuse

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Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2021-04-27 14:38:45 +02:00
parent cb04553d47
commit 8ebcd68a2c
1 changed files with 35 additions and 27 deletions
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62
proxmox-api-macro/src/serde.rs
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@ -162,40 +162,48 @@ pub struct SerdeAttrib {
pub flatten: bool,
}
impl SerdeAttrib {
pub fn parse_attribute(&mut self, attrib: &syn::Attribute) -> Result<(), syn::Error> {
use syn::{Meta, NestedMeta};
if !attrib.path.is_ident("serde") {
return Ok(());
}
let args: AttrArgs = syn::parse2(attrib.tokens.clone())?;
for arg in args.args {
match arg {
NestedMeta::Meta(Meta::NameValue(var)) if var.path.is_ident("rename") => {
match var.lit {
syn::Lit::Str(lit) => {
let rename = FieldName::from(&lit);
if self.rename.is_some() && self.rename.as_ref() != Some(&rename) {
error!(lit => "multiple conflicting 'rename' attributes");
}
self.rename = Some(rename);
}
_ => error!(var.lit => "'rename' value must be a string literal"),
}
}
NestedMeta::Meta(Meta::Path(path)) if path.is_ident("flatten") => {
self.flatten = true;
}
_ => continue,
}
}
Ok(())
}
}
impl TryFrom<&[syn::Attribute]> for SerdeAttrib {
type Error = syn::Error;
fn try_from(attributes: &[syn::Attribute]) -> Result<Self, syn::Error> {
use syn::{Meta, NestedMeta};
let mut this: Self = Default::default();
for attrib in attributes {
if !attrib.path.is_ident("serde") {
continue;
}
let args: AttrArgs = syn::parse2(attrib.tokens.clone())?;
for arg in args.args {
match arg {
NestedMeta::Meta(Meta::NameValue(var)) if var.path.is_ident("rename") => {
match var.lit {
syn::Lit::Str(lit) => {
let rename = FieldName::from(&lit);
if this.rename.is_some() && this.rename.as_ref() != Some(&rename) {
error!(lit => "multiple conflicting 'rename' attributes");
}
this.rename = Some(rename);
}
_ => error!(var.lit => "'rename' value must be a string literal"),
}
}
NestedMeta::Meta(Meta::Path(path)) if path.is_ident("flatten") => {
this.flatten = true;
}
_ => continue,
}
}
this.parse_attribute(attrib)?;
}
Ok(this)