Move ParseFailure to errors

Signed-off-by: Marcel Müller <neikos@neikos.email>

src/errors.rs

@@ -1,5 +1,13 @@
+use std::sync::Arc;
+
+use annotate_snippets::AnnotationKind;
+use annotate_snippets::Level;
+use annotate_snippets::Renderer;
+use annotate_snippets::Snippet;
 use thiserror::Error;
 
+use crate::input::NomoInput;
+use crate::lexer::ParseError;
 use crate::parser::AstError;
 
 #[derive(Debug, Error)]
@@ -50,3 +58,51 @@ impl AstFailure {
         renderer.render(&reports)
     }
 }
+
+#[derive(Debug, Error)]
+pub struct ParseFailure {
+    input: Arc<str>,
+    errors: Vec<ParseError>,
+}
+
+impl std::fmt::Display for ParseFailure {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(&self.to_report())
+    }
+}
+
+impl ParseFailure {
+    pub(crate) fn from_errors(errors: Vec<ParseError>, input: NomoInput) -> ParseFailure {
+        ParseFailure {
+            input: Arc::from(input.to_string()),
+            errors,
+        }
+    }
+
+    pub fn to_report(&self) -> String {
+        let reports = self
+            .errors
+            .iter()
+            .map(|error| {
+                Level::ERROR
+                    .primary_title(
+                        error
+                            .message
+                            .as_deref()
+                            .unwrap_or("An error occurred while parsing"),
+                    )
+                    .element(
+                        Snippet::source(self.input.as_ref()).annotation(
+                            AnnotationKind::Primary
+                                .span(error.span.clone().map(|s| s.range).unwrap_or_else(|| 0..0)),
+                        ),
+                    )
+                    .elements(error.help.as_ref().map(|help| Level::HELP.message(help)))
+            })
+            .collect::<Vec<_>>();
+
+        let renderer =
+            Renderer::styled().decor_style(annotate_snippets::renderer::DecorStyle::Unicode);
+        renderer.render(&reports)
+    }
+}