# cljrs-types
Core types shared across every cljrs crate: source spans, the unified error/diagnostic
type, and the `CljxResult` alias.
**Phase:** 1 (Project Infrastructure) — fully implemented.
**Used by:** all other crates in the workspace.
---
## File layout
```
src/
lib.rs — module declarations: `pub mod error; pub mod span;`
error.rs — CljxError enum and CljxResult type alias
span.rs — Span struct (byte-range + location in a named source file)
```
---
## Public API
### `span::Span`
A half-open byte range `[start, end)` within a named source file.
```rust
pub struct Span {
pub file: Arc<String>, // file path, or "<repl>"
pub start: usize, // inclusive byte offset
pub end: usize, // exclusive byte offset
pub line: u32, // 1-based line number of `start`
pub col: u32, // 1-based byte column of `start`
}
impl Span {
pub fn new(file: Arc<String>, start: usize, end: usize, line: u32, col: u32) -> Self
pub fn len(&self) -> usize
pub fn is_empty(&self) -> bool
}
```
**Trait impls:**
- `From<&Span> for miette::SourceSpan`
- `From<Span> for miette::SourceSpan`
### `error::CljxError`
Unified error type for all clojurust subsystems. Derives
[`miette::Diagnostic`](https://docs.rs/miette) so errors render with source
snippets and labels in the terminal.
```rust
pub enum CljxError {
ReadError {
message: String,
span: Option<miette::SourceSpan>, // label position in source
src: miette::NamedSource<String>, // full source text + file name
},
EvalError {
message: String,
span: Option<miette::SourceSpan>,
src: miette::NamedSource<String>,
},
Io(#[from] std::io::Error),
}
```
### `error::CljxResult<T>`
```rust
pub type CljxResult<T> = Result<T, CljxError>;
```
---
## Dependencies
| `miette` (workspace) | Diagnostic trait + `NamedSource`, `SourceSpan` |
| `thiserror` (workspace) | `#[derive(Error)]` codegen |