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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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30
proxmox-api-macro/src/serde.rs
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@ -162,17 +162,12 @@ pub struct SerdeAttrib {
pub flatten: bool, pub flatten: bool,
} }
impl TryFrom<&[syn::Attribute]> for SerdeAttrib { impl SerdeAttrib {
type Error = syn::Error; pub fn parse_attribute(&mut self, attrib: &syn::Attribute) -> Result<(), syn::Error> {
fn try_from(attributes: &[syn::Attribute]) -> Result<Self, syn::Error> {
use syn::{Meta, NestedMeta}; use syn::{Meta, NestedMeta};
let mut this: Self = Default::default();
for attrib in attributes {
if !attrib.path.is_ident("serde") { if !attrib.path.is_ident("serde") {
continue; return Ok(());
} }
let args: AttrArgs = syn::parse2(attrib.tokens.clone())?; let args: AttrArgs = syn::parse2(attrib.tokens.clone())?;
@ -182,20 +177,33 @@ impl TryFrom<&[syn::Attribute]> for SerdeAttrib {
match var.lit { match var.lit {
syn::Lit::Str(lit) => { syn::Lit::Str(lit) => {
let rename = FieldName::from(&lit); let rename = FieldName::from(&lit);
if this.rename.is_some() && this.rename.as_ref() != Some(&rename) { if self.rename.is_some() && self.rename.as_ref() != Some(&rename) {
error!(lit => "multiple conflicting 'rename' attributes"); error!(lit => "multiple conflicting 'rename' attributes");
} }
this.rename = Some(rename); self.rename = Some(rename);
} }
_ => error!(var.lit => "'rename' value must be a string literal"), _ => error!(var.lit => "'rename' value must be a string literal"),
} }
} }
NestedMeta::Meta(Meta::Path(path)) if path.is_ident("flatten") => { NestedMeta::Meta(Meta::Path(path)) if path.is_ident("flatten") => {
this.flatten = true; self.flatten = true;
} }
_ => continue, _ => continue,
} }
} }
Ok(())
}
}
impl TryFrom<&[syn::Attribute]> for SerdeAttrib {
type Error = syn::Error;
fn try_from(attributes: &[syn::Attribute]) -> Result<Self, syn::Error> {
let mut this: Self = Default::default();
for attrib in attributes {
this.parse_attribute(attrib)?;
} }
Ok(this) Ok(this)