polonius 0.3.0

Core definition for the Rust borrow checker
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use crate::facts::AllFacts;
use crate::intern::{InternTo, InternerTables};
use std::fs::File;
use std::io::{self, prelude::*};
use std::path::Path;
use std::process;

trait FromTabDelimited<'input>: Sized {
    fn parse(
        tables: &mut InternerTables,
        inputs: &mut dyn Iterator<Item = &'input str>,
    ) -> Option<Self>;
}

pub(crate) fn load_tab_delimited_facts(
    tables: &mut InternerTables,
    facts_dir: &Path,
) -> io::Result<AllFacts> {
    macro_rules! load_facts {
        (from ($tables:expr, $facts_dir:expr) load AllFacts { $($t:ident,)* }) => {
            Ok(AllFacts {
                $(
                    $t: {
                        let filename = format!("{}.facts", stringify!($t));
                        let facts_file = $facts_dir.join(&filename);
                        load_tab_delimited_file($tables, &facts_file)?
                    },
                )*
            })
        }
    }

    load_facts! {
        from (tables, facts_dir) load AllFacts {
            borrow_region,
            universal_region,
            cfg_edge,
            killed,
            outlives,
            region_live_at,
            invalidates,
        }
    }
}

fn load_tab_delimited_file<Row>(tables: &mut InternerTables, path: &Path) -> io::Result<Vec<Row>>
where
    Row: for<'input> FromTabDelimited<'input>,
{
    let file = File::open(path)?;

    io::BufReader::new(file)
        .lines()
        .enumerate()
        .map(|(index, line)| {
            let line = line?;
            let mut columns = line.split('\t');
            let row = match FromTabDelimited::parse(tables, &mut columns) {
                None => {
                    eprintln!("error parsing line {} of `{}`", index + 1, path.display());
                    process::exit(1);
                }

                Some(v) => v,
            };

            if columns.next().is_some() {
                eprintln!("extra data on line {} of `{}`", index + 1, path.display());
                process::exit(1);
            }

            Ok(row)
        })
        .collect()
}

impl<'input, T> FromTabDelimited<'input> for T
where
    &'input str: InternTo<T>,
{
    fn parse(
        tables: &mut InternerTables,
        inputs: &mut dyn Iterator<Item = &'input str>,
    ) -> Option<Self> {
        let input = inputs.next()?;
        Some(InternTo::intern(tables, input))
    }
}

impl<'input, A, B> FromTabDelimited<'input> for (A, B)
where
    A: FromTabDelimited<'input>,
    B: FromTabDelimited<'input>,
{
    fn parse(
        tables: &mut InternerTables,
        inputs: &mut dyn Iterator<Item = &'input str>,
    ) -> Option<Self> {
        let a = A::parse(tables, inputs)?;
        let b = B::parse(tables, inputs)?;
        Some((a, b))
    }
}

impl<'input, A, B, C> FromTabDelimited<'input> for (A, B, C)
where
    A: FromTabDelimited<'input>,
    B: FromTabDelimited<'input>,
    C: FromTabDelimited<'input>,
{
    fn parse(
        tables: &mut InternerTables,
        inputs: &mut dyn Iterator<Item = &'input str>,
    ) -> Option<Self> {
        let a = A::parse(tables, inputs)?;
        let b = B::parse(tables, inputs)?;
        let c = C::parse(tables, inputs)?;
        Some((a, b, c))
    }
}

impl<'input, A, B, C, D> FromTabDelimited<'input> for (A, B, C, D)
where
    A: FromTabDelimited<'input>,
    B: FromTabDelimited<'input>,
    C: FromTabDelimited<'input>,
    D: FromTabDelimited<'input>,
{
    fn parse(
        tables: &mut InternerTables,
        inputs: &mut dyn Iterator<Item = &'input str>,
    ) -> Option<Self> {
        let a = A::parse(tables, inputs)?;
        let b = B::parse(tables, inputs)?;
        let c = C::parse(tables, inputs)?;
        let d = D::parse(tables, inputs)?;
        Some((a, b, c, d))
    }
}