Lawrence Bethlenfalvy
0b887ced70
- Interner no longer contains unsafe code - Tokens now hold a reference to the value they represent directly This will enable many future improvements
71 lines
2.0 KiB
Rust
71 lines
2.0 KiB
Rust
use std::rc::Rc;
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use super::ProjectError;
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use crate::representations::project::ProjectModule;
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#[allow(unused)] // For doc
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use crate::tree::Module;
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use crate::tree::WalkError;
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use crate::{Interner, Location, NameLike, Tok, VName};
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/// Error produced when an import refers to a nonexistent module
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#[derive(Clone, Debug, PartialEq, Eq, Hash)]
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pub struct NotFound {
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/// The module that imported the invalid path
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pub source: Option<VName>,
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/// The file not containing the expected path
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pub file: VName,
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/// The invalid import path
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pub subpath: VName,
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}
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impl NotFound {
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/// Produce this error from the parameters of [Module]`::walk_ref` and a
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/// [WalkError]
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///
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/// # Panics
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///
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/// - if `path` is shorter than the `pos` of the error
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/// - if a walk up to but not including `pos` fails
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///
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/// Basically, if `e` was not produced by the `walk*` methods called on
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/// `path`.
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pub fn from_walk_error(
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source: &[Tok<String>],
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prefix: &[Tok<String>],
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path: &[Tok<String>],
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orig: &ProjectModule<impl NameLike>,
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e: WalkError,
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) -> Self {
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let last_mod =
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orig.walk_ref(&path[..e.pos], false).expect("error occured on next step");
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let mut whole_path = prefix.iter().chain(path.iter()).cloned();
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if let Some(file) = &last_mod.extra.file {
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Self {
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source: Some(source.to_vec()),
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file: whole_path.by_ref().take(file.len()).collect(),
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subpath: whole_path.collect(),
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}
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} else {
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Self {
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source: Some(source.to_vec()),
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file: whole_path.collect(),
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subpath: Vec::new(),
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}
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}
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}
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}
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impl ProjectError for NotFound {
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fn description(&self) -> &str {
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"an import refers to a nonexistent module"
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}
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fn message(&self) -> String {
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format!(
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"module {} in {} was not found",
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Interner::extern_all(&self.subpath).join("::"),
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Interner::extern_all(&self.file).join("/"),
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)
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}
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fn one_position(&self) -> crate::Location {
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Location::File(Rc::new(Interner::extern_all(&self.file)))
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}
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}
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