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#![feature(box_patterns)]
#![feature(trace_macros)]
#![feature(proc_macro_hygiene)]
mod normalize;
pub use crate::normalize::*;
pub mod imports;
pub mod typecheck;
use dhall_core::*;
use std::fs::File;
use std::io::Read;
use std::path::Path;
use std::fmt;
#[derive(Debug)]
pub enum DhallError {
ParseError(parser::ParseError),
IOError(std::io::Error),
}
impl From<parser::ParseError> for DhallError {
fn from(e: parser::ParseError) -> Self {
DhallError::ParseError(e)
}
}
impl From<std::io::Error> for DhallError {
fn from(e: std::io::Error) -> Self {
DhallError::IOError(e)
}
}
impl fmt::Display for DhallError {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
use self::DhallError::*;
match self {
ParseError(e) => e.fmt(f),
IOError(e) => e.fmt(f),
}
}
}
/// `source_pool` is a Vec of strings to be used to store the contents of imported files.
/// No ideal but necessary for lifetime reasons for now.
pub fn load_dhall_file<'i, 'a: 'i>(
f: &Path,
source_pool: &'a mut Vec<String>,
resolve_imports: bool,
) -> Result<Expr<'i, X, X>, DhallError> {
source_pool.push(String::new());
let mut buffer = source_pool.last_mut().unwrap();
File::open(f)?.read_to_string(&mut buffer)?;
let expr = parser::parse_expr(&*buffer)?;
let expr = imports::resolve_imports(&expr);
Ok(expr)
}
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