iab_gpp_derive 0.1.0

Macros for the IAB GPP Consent String implementation
Documentation 
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use crate::find_gpp_attr;
use syn::{Attribute, LitInt, parse};

pub struct GPPEnumVariantHelperAttribute {
    pub variant_version: Option<u8>,
}

impl GPPEnumVariantHelperAttribute {
    pub fn new(attrs: &[Attribute]) -> parse::Result<Self> {
        let mut gpp_attr = Self {
            variant_version: None,
        };

        if let Some(attr) = find_gpp_attr(attrs) {
            attr.parse_nested_meta(|meta| {
                // #[gpp(version = N)]
                if meta.path.is_ident("version") {
                    let value = meta.value()?; // parses the `=`
                    let s = value.parse::<LitInt>()?;
                    gpp_attr.variant_version = Some(s.base10_parse()?);

                    return Ok(());
                }

                Err(meta.error("unrecognized gpp enum parameter"))
            })?;
        }

        Ok(gpp_attr)
    }
}