commit 2f626af47071623ff393a568fdf765526342fb27
from: Murilo Ijanc <murilo.ijanc@kovi.com.br>
date: Tue Aug  5 17:20:00 2025 UTC

Add span and error types

Span tracks byte positions in source code for error
reporting. OlangError carries a message and span.

commit - c916ec471c406a8caef7d57af437fa182632e120
commit + 2f626af47071623ff393a568fdf765526342fb27
blob - /dev/null
blob + aa69daf3d651955eac5e92fe1316dc2a7d997967 (mode 644)
--- /dev/null
+++ src/error.rs
@@ -0,0 +1,47 @@
+// vim: set tw=79 cc=80 ts=4 sw=4 sts=4 et :
+//
+// Copyright (c) 2025-2026 Murilo Ijanc' <murilo@ijanc.org>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+
+use std::fmt;
+
+use crate::span::Span;
+
+#[derive(Debug, Clone)]
+pub struct OlangError {
+    pub message: String,
+    pub span: Span,
+}
+
+impl OlangError {
+    pub fn new(
+        message: impl Into<String>,
+        span: Span,
+    ) -> Self {
+        Self {
+            message: message.into(),
+            span,
+        }
+    }
+}
+
+impl fmt::Display for OlangError {
+    fn fmt(
+        &self,
+        f: &mut fmt::Formatter<'_>,
+    ) -> fmt::Result {
+        write!(f, "error: {}", self.message)
+    }
+}
blob - /dev/null
blob + 5a454a528486b4073ba49646dfbb0384bb8001f4 (mode 644)
--- /dev/null
+++ src/span.rs
@@ -0,0 +1,28 @@
+// vim: set tw=79 cc=80 ts=4 sw=4 sts=4 et :
+//
+// Copyright (c) 2025-2026 Murilo Ijanc' <murilo@ijanc.org>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Span {
+    pub start: usize,
+    pub end: usize,
+}
+
+impl Span {
+    pub fn new(start: usize, end: usize) -> Self {
+        Self { start, end }
+    }
+}