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use quote::{quote, ToTokens};
use std::fmt::Display;
use syn::parse::{Parse, ParseStream};
#[derive(Debug, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub enum PositioningRef {
FullPath(String),
Name(String),
}
impl Display for PositioningRef {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
PositioningRef::FullPath(i) => f.write_str(i),
PositioningRef::Name(i) => f.write_str(i),
}
}
}
impl Parse for PositioningRef {
fn parse(input: ParseStream) -> Result<Self, syn::Error> {
let maybe_litstr: Option<syn::LitStr> = input.parse()?;
let found = if let Some(litstr) = maybe_litstr {
Self::Name(litstr.value())
} else {
let path: syn::Path = input.parse()?;
let path_str = path.to_token_stream().to_string().replace(" ", "");
Self::FullPath(path_str)
};
Ok(found)
}
}
impl ToTokens for PositioningRef {
fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
let toks = match self {
PositioningRef::FullPath(item) => quote! {
::pgx::utils::sql_entity_graph::PositioningRef::FullPath(String::from(#item))
},
PositioningRef::Name(item) => quote! {
::pgx::utils::sql_entity_graph::PositioningRef::Name(String::from(#item))
},
};
toks.to_tokens(tokens);
}
}
