tier-derive 0.1.17

Derive macros for tier Rust configuration metadata
Documentation 
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use syn::LitStr;

use crate::serde_attrs::rename::RenameRule;
use crate::syntax::parse_string_value;

pub(super) fn parse_rename_all_meta(
    meta: syn::meta::ParseNestedMeta<'_>,
    serialize: &mut Option<RenameRule>,
    deserialize: &mut Option<RenameRule>,
) -> syn::Result<()> {
    if meta.input.peek(syn::Token![=]) {
        let literal: LitStr = meta.value()?.parse()?;
        let rule = RenameRule::parse(&literal.value(), literal.span())?;
        *serialize = Some(rule);
        *deserialize = Some(rule);
        return Ok(());
    }

    meta.parse_nested_meta(|nested| {
        if nested.path.is_ident("serialize") {
            let literal: LitStr = nested.value()?.parse()?;
            *serialize = Some(RenameRule::parse(&literal.value(), literal.span())?);
            return Ok(());
        }
        if nested.path.is_ident("deserialize") {
            let literal: LitStr = nested.value()?.parse()?;
            *deserialize = Some(RenameRule::parse(&literal.value(), literal.span())?);
            return Ok(());
        }
        Err(nested.error("unsupported serde rename_all option"))
    })
}

pub(super) fn parse_rename_meta(
    meta: syn::meta::ParseNestedMeta<'_>,
    serialize: &mut Option<String>,
    deserialize: &mut Option<String>,
) -> syn::Result<()> {
    if meta.input.peek(syn::Token![=]) {
        let value = parse_string_value(meta)?;
        *serialize = Some(value.clone());
        *deserialize = Some(value);
        return Ok(());
    }

    meta.parse_nested_meta(|nested| {
        if nested.path.is_ident("serialize") {
            *serialize = Some(parse_string_value(nested)?);
            return Ok(());
        }
        if nested.path.is_ident("deserialize") {
            *deserialize = Some(parse_string_value(nested)?);
            return Ok(());
        }
        Err(nested.error("unsupported serde rename option"))
    })
}