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|
// use dhall_core::{Expr, FilePrefix, Import, ImportLocation, ImportMode, X};
use dhall_core::{Expr, Import, X};
// use std::path::Path;
use crate::binary::DecodeError;
use crate::expr::*;
use dhall_core::*;
use std::fmt;
use std::fs::File;
use std::io::Read;
use std::path::Path;
use std::path::PathBuf;
#[derive(Debug)]
pub enum ImportError {
ParseError(ParseError),
BinaryDecodeError(DecodeError),
IOError(std::io::Error),
UnexpectedImportError(Import),
}
impl From<ParseError> for ImportError {
fn from(e: ParseError) -> Self {
ImportError::ParseError(e)
}
}
impl From<DecodeError> for ImportError {
fn from(e: DecodeError) -> Self {
ImportError::BinaryDecodeError(e)
}
}
impl From<std::io::Error> for ImportError {
fn from(e: std::io::Error) -> Self {
ImportError::IOError(e)
}
}
impl fmt::Display for ImportError {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
use self::ImportError::*;
match self {
ParseError(e) => e.fmt(f),
BinaryDecodeError(_) => unimplemented!(),
IOError(e) => e.fmt(f),
UnexpectedImportError(e) => e.fmt(f),
}
}
}
// Deprecated
pub fn panic_imports<S: Clone>(expr: &Expr<S, Import>) -> Expr<S, X> {
let no_import = |i: &Import| -> X { panic!("ahhh import: {:?}", i) };
expr.map_embed(&no_import)
}
/// A root from which to resolve relative imports.
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum ImportRoot {
LocalDir(PathBuf),
}
fn resolve_import(
import: &Import,
root: &ImportRoot,
) -> Result<Expr<X, X>, ImportError> {
use self::ImportRoot::*;
use dhall_core::FilePrefix::*;
use dhall_core::ImportLocation::*;
let cwd = match root {
LocalDir(cwd) => cwd,
};
match &import.location_hashed.location {
Local(prefix, path) => {
let path = match prefix {
Parent => cwd.parent().unwrap().join(path),
Here => cwd.join(path),
_ => unimplemented!("{:?}", import),
};
load_dhall_file(&path, true)
}
_ => unimplemented!("{:?}", import),
}
}
fn resolve_expr(
Parsed(expr, root): Parsed,
allow_imports: bool,
) -> Result<Resolved, ImportError> {
let resolve = |import: &Import| -> Result<SubExpr<X, X>, ImportError> {
if allow_imports {
let expr = resolve_import(import, &root)?;
Ok(expr.roll())
} else {
Err(ImportError::UnexpectedImportError(import.clone()))
}
};
let expr = expr.as_ref().traverse_embed(&resolve)?;
Ok(Resolved(expr.squash_embed()))
}
impl Parsed {
pub fn load_from_file(f: &Path) -> Result<Parsed, ImportError> {
let mut buffer = String::new();
File::open(f)?.read_to_string(&mut buffer)?;
let expr = parse_expr(&*buffer)?;
let root = ImportRoot::LocalDir(f.parent().unwrap().to_owned());
Ok(Parsed(expr, root))
}
pub fn load_from_str(s: &str) -> Result<Parsed, ImportError> {
let expr = parse_expr(s)?;
let root = ImportRoot::LocalDir(std::env::current_dir()?);
Ok(Parsed(expr, root))
}
pub fn load_from_binary_file(f: &Path) -> Result<Parsed, ImportError> {
let mut buffer = Vec::new();
File::open(f)?.read_to_end(&mut buffer)?;
let expr = crate::binary::decode(&buffer)?;
let root = ImportRoot::LocalDir(f.parent().unwrap().to_owned());
Ok(Parsed(expr, root))
}
pub fn resolve(self) -> Result<Resolved, ImportError> {
crate::imports::resolve_expr(self, true)
}
pub fn resolve_no_imports(self) -> Result<Resolved, ImportError> {
crate::imports::resolve_expr(self, false)
}
}
// Deprecated
pub fn load_dhall_file(
f: &Path,
resolve_imports: bool,
) -> Result<Expr<X, X>, ImportError> {
let expr = Parsed::load_from_file(f)?;
let expr = resolve_expr(expr, resolve_imports)?;
Ok(expr.0.unroll())
}
// Deprecated
pub fn load_dhall_file_no_resolve_imports(
f: &Path,
) -> Result<ParsedExpr, ImportError> {
Ok(Parsed::load_from_file(f)?.0)
}
|
