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authorNadrieril2020-03-01 18:06:46 +0000
committerNadrieril2020-03-05 15:58:54 +0000
commitcbc1825313389746f08df5502568b2e13e04790d (patch)
treec1c32701f0dc38835eccb806534bb19297cbf420 /dhall/src
parent386f34af802a812c2af8ece2cc427cfb5a7c1fe8 (diff)
Refactor resolve a bit
Diffstat (limited to '')
-rw-r--r--dhall/src/semantics/resolve/resolve.rs156
1 files changed, 76 insertions, 80 deletions
diff --git a/dhall/src/semantics/resolve/resolve.rs b/dhall/src/semantics/resolve/resolve.rs
index bf7aabb..ad2cd75 100644
--- a/dhall/src/semantics/resolve/resolve.rs
+++ b/dhall/src/semantics/resolve/resolve.rs
@@ -1,4 +1,3 @@
-use itertools::Itertools;
use std::borrow::Cow;
use std::env;
use std::path::PathBuf;
@@ -10,7 +9,7 @@ use crate::syntax;
use crate::syntax::map::DupTreeMap;
use crate::syntax::{
BinOp, Builtin, Expr, ExprKind, FilePath, FilePrefix, ImportLocation,
- ImportMode, Span, URL,
+ ImportMode, Span, UnspannedExpr, URL,
};
use crate::{Parsed, ParsedExpr, Resolved};
@@ -26,109 +25,106 @@ pub(crate) enum ImportRoot {
LocalDir(PathBuf),
}
-fn resolve_one_import(
- env: &mut ImportEnv,
- import: &Import,
+fn mkexpr(kind: UnspannedExpr) -> Expr {
+ Expr::new(kind, Span::Artificial)
+}
+
+fn make_aslocation_uniontype() -> Expr {
+ let text_type = mkexpr(ExprKind::Builtin(Builtin::Text));
+ let mut union = DupTreeMap::default();
+ union.insert("Local".into(), Some(text_type.clone()));
+ union.insert("Remote".into(), Some(text_type.clone()));
+ union.insert("Environment".into(), Some(text_type.clone()));
+ union.insert("Missing".into(), None);
+ mkexpr(ExprKind::UnionType(union))
+}
+
+fn compute_relative_path(
root: &ImportRoot,
-) -> Result<TypedHir, Error> {
+ prefix: &FilePrefix,
+ path: &FilePath,
+) -> PathBuf {
let cwd = match root {
ImportRoot::LocalDir(cwd) => cwd,
};
+ let mut cwd: Vec<String> = cwd
+ .components()
+ .map(|component| component.as_os_str().to_string_lossy().into_owned())
+ .collect();
+ let root = match prefix {
+ FilePrefix::Here => cwd,
+ FilePrefix::Parent => {
+ cwd.push("..".to_string());
+ cwd
+ }
+ FilePrefix::Absolute => vec![],
+ FilePrefix::Home => vec![],
+ };
+ let path: Vec<_> = root
+ .into_iter()
+ .chain(path.file_path.iter().cloned())
+ .collect();
+ let path = (FilePath { file_path: path }).canonicalize().file_path;
+ let prefix = match prefix {
+ FilePrefix::Here | FilePrefix::Parent => ".",
+ FilePrefix::Absolute => "/",
+ FilePrefix::Home => "~",
+ };
+ Some(prefix.to_string()).into_iter().chain(path).collect()
+}
+fn resolve_one_import(
+ env: &mut ImportEnv,
+ import: &Import,
+ root: &ImportRoot,
+) -> Result<TypedHir, Error> {
match import.mode {
ImportMode::Code => {
- match &import.location {
+ let parsed = match &import.location {
ImportLocation::Local(prefix, path) => {
- let path_buf: PathBuf = path.file_path.iter().collect();
- let path_buf = match prefix {
- // TODO: fail gracefully
- FilePrefix::Parent => {
- cwd.parent().unwrap().join(path_buf)
- }
- FilePrefix::Here => cwd.join(path_buf),
- _ => unimplemented!("{:?}", import),
- };
-
- let parsed = Parsed::parse_file(&path_buf)?;
- let typed = resolve_with_env(env, parsed)?.typecheck()?;
- Ok((typed.normalize().to_hir(), typed.ty().clone()))
+ let path = compute_relative_path(root, prefix, path);
+ Parsed::parse_file(&path)?
}
ImportLocation::Env(var_name) => {
let val = match env::var(var_name) {
Ok(val) => val,
Err(_) => Err(ImportError::MissingEnvVar)?,
};
- let parsed = Parsed::parse_str(&val)?;
- let typed = resolve_with_env(env, parsed)?.typecheck()?;
- Ok((typed.normalize().to_hir(), typed.ty().clone()))
+ Parsed::parse_str(&val)?
}
- ImportLocation::Missing => Err(ImportError::Missing.into()),
+ ImportLocation::Missing => Err(ImportError::Missing)?,
_ => unimplemented!("{:?}", import),
- }
+ };
+
+ let typed = resolve_with_env(env, parsed)?.typecheck()?;
+ Ok((typed.normalize().to_hir(), typed.ty().clone()))
}
ImportMode::RawText => unimplemented!("{:?}", import),
ImportMode::Location => {
- let mkexpr = |kind| Expr::new(kind, Span::Artificial);
- let text_type = mkexpr(ExprKind::Builtin(Builtin::Text));
- let mut location_union = DupTreeMap::default();
- location_union.insert("Local".into(), Some(text_type.clone()));
- location_union.insert("Remote".into(), Some(text_type.clone()));
- location_union
- .insert("Environment".into(), Some(text_type.clone()));
- location_union.insert("Missing".into(), None);
- let location_union = mkexpr(ExprKind::UnionType(location_union));
-
- let expr = match &import.location {
+ let (field_name, arg) = match &import.location {
ImportLocation::Local(prefix, path) => {
- let mut cwd: Vec<String> = cwd
- .components()
- .map(|component| {
- component.as_os_str().to_string_lossy().into_owned()
- })
- .collect();
- let root = match prefix {
- FilePrefix::Here => cwd,
- FilePrefix::Parent => {
- cwd.push("..".to_string());
- cwd
- }
- FilePrefix::Absolute => vec![],
- FilePrefix::Home => vec![],
- };
- let path: Vec<_> = root
- .into_iter()
- .chain(path.file_path.iter().cloned())
- .collect();
- let path =
- (FilePath { file_path: path }).canonicalize().file_path;
- let prefix = match prefix {
- FilePrefix::Here | FilePrefix::Parent => ".",
- FilePrefix::Absolute => "",
- FilePrefix::Home => "~",
- };
- let path = Some(prefix.to_string())
- .into_iter()
- .chain(path)
- .join("/");
-
- mkexpr(ExprKind::App(
- mkexpr(ExprKind::Field(location_union, "Local".into())),
- mkexpr(ExprKind::TextLit(path.into())),
- ))
+ let path = compute_relative_path(root, prefix, path)
+ .to_string_lossy()
+ .into_owned();
+ ("Local", Some(path))
}
- ImportLocation::Env(name) => mkexpr(ExprKind::App(
- mkexpr(ExprKind::Field(
- location_union,
- "Environment".into(),
- )),
- mkexpr(ExprKind::TextLit(name.clone().into())),
- )),
- ImportLocation::Missing => {
- mkexpr(ExprKind::Field(location_union, "Missing".into()))
+ ImportLocation::Env(name) => {
+ ("Environment", Some(name.clone()))
}
+ ImportLocation::Missing => ("Missing", None),
_ => unimplemented!("{:?}", import),
};
+ let asloc_ty = make_aslocation_uniontype();
+ let expr = mkexpr(ExprKind::Field(asloc_ty, field_name.into()));
+ let expr = match arg {
+ Some(arg) => mkexpr(ExprKind::App(
+ expr,
+ mkexpr(ExprKind::TextLit(arg.into())),
+ )),
+ None => expr,
+ };
+
let hir = skip_resolve(&expr)?;
let ty = hir.typecheck_noenv()?.ty().clone();
Ok((hir, ty))