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use super::Item;
use syn::{
    parse::{Parse, ParseStream},
    Attribute, Result,
};

/// A Solidity file. The root of the AST.
#[derive(Debug)]
pub struct File {
    /// The inner attributes of the file.
    pub attrs: Vec<Attribute>,
    /// The items in the file.
    pub items: Vec<Item>,
}

impl Parse for File {
    fn parse(input: ParseStream<'_>) -> Result<Self> {
        let attrs = input.call(Attribute::parse_inner)?;
        let mut items = Vec::new();
        while !input.is_empty() {
            items.push(input.parse()?);
        }
        if items.is_empty() {
            Err(input.parse::<Item>().unwrap_err())
        } else {
            Ok(Self { attrs, items })
        }
    }
}