kenzu 0.0.9

Procedural macros for builder pattern generation and validation
Documentation 
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use proc_macro2::TokenStream;
use syn::{Attribute, LitStr};

#[derive(Debug, Default)]
pub struct Range {
    pub min: Option<TokenStream>,
    pub max: Option<TokenStream>,
    pub err_min: Option<String>,
    pub err_max: Option<String>,
}

pub fn get_range(attributes: Vec<Attribute>) -> Range {
    let mut range = Range::default();

    for attr in attributes {
        if attr.path().is_ident("range") {
            attr.parse_nested_meta(|meta| {
                if meta.path.is_ident("min")
                    && let Ok(token) = meta.value()?.parse::<TokenStream>()
                {
                    range.min = Some(token);
                } else if meta.path.is_ident("max")
                    && let Ok(token) = meta.value()?.parse::<TokenStream>()
                {
                    range.max = Some(token);
                } else if meta.path.is_ident("err_max")
                    && let Ok(err) = meta.value()?.parse::<LitStr>()
                {
                    range.err_max = Some(err.value());
                } else if meta.path.is_ident("err_min")
                    && let Ok(err) = meta.value()?.parse::<LitStr>()
                {
                    range.err_min = Some(err.value());
                }
                Ok(())
            })
            .unwrap();
        }
    }

    range
}