1 files changed, 59 insertions, 0 deletions

diff --git a/deepcrow/src/error.rs b/deepcrow/src/error.rs
new file mode 100644
index 0000000..8fe21f0
--- /dev/null
+++ b/deepcrow/src/error.rs
@@ -0,0 +1,59 @@
+
+use core::error::Error;
+use std::fmt;
+
+use crate::position::*;
+
+#[derive(Debug)]
+pub struct DeepCrowError {
+    position: Position,
+    what: String,
+}
+
+impl DeepCrowError {
+    pub fn parse( position: Position, what: String ) -> Self {
+        Self {
+            position,
+            what,
+        }
+    }
+
+    pub fn other(what: String) -> Self {
+        Self {
+            position: Position::none(),
+            what,
+        }
+    }
+
+    pub fn broken( position: Position, what: &str ) -> Self {
+        Self {
+            position,
+            what: format!("Broken parser? {}", what),
+        }
+    }
+
+    pub fn eos( context: &str ) -> Self {
+        Self {
+            position: Position::none(),
+            what: format!("Premature end of stream while looking for {}", context),
+        }
+    }
+
+    pub fn what(&self) -> &str {
+        &self.what
+    }
+
+    pub fn start(&self) -> &Position {
+        &self.position
+    }
+}
+
+impl fmt::Display for DeepCrowError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Error parsing input: {}", "yeah")
+    }
+}
+
+impl Error for DeepCrowError { }
+
+pub type Result<T> = std::result::Result<T, DeepCrowError>;