fluidattacks_blends_domain/syntax/
error.rs

1//! Failure modes of the syntax graph build.
2
3#[derive(Clone, Copy, PartialEq, Eq, Debug)]
4pub enum SyntaxGraphError {
5    EmptyAstGraph,
6    MissingRootNode,
7    MissingAstNode,
8    UnexpectedAstShape,
9    UnsupportedLanguage,
10}
11
12impl core::fmt::Display for SyntaxGraphError {
13    fn fmt(&self, formatter: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
14        formatter.write_str(match *self {
15            Self::EmptyAstGraph => "ast graph has no nodes",
16            Self::MissingRootNode => "ast graph has no root node at id 1",
17            Self::MissingAstNode => "a reader reached an id absent from the ast graph",
18            Self::UnexpectedAstShape => "a reader found an ast shape its grammar cannot produce",
19            Self::UnsupportedLanguage => "no syntax dispatcher is implemented for this language",
20        })
21    }
22}
23
24#[cfg(test)]
25mod tests {
26    use super::SyntaxGraphError;
27    use alloc::string::ToString;
28
29    #[test]
30    fn every_error_renders_its_failure_mode() {
31        assert_eq!(
32            SyntaxGraphError::EmptyAstGraph.to_string(),
33            "ast graph has no nodes"
34        );
35        assert_eq!(
36            SyntaxGraphError::MissingRootNode.to_string(),
37            "ast graph has no root node at id 1"
38        );
39        assert_eq!(
40            SyntaxGraphError::MissingAstNode.to_string(),
41            "a reader reached an id absent from the ast graph"
42        );
43        assert_eq!(
44            SyntaxGraphError::UnexpectedAstShape.to_string(),
45            "a reader found an ast shape its grammar cannot produce"
46        );
47        assert_eq!(
48            SyntaxGraphError::UnsupportedLanguage.to_string(),
49            "no syntax dispatcher is implemented for this language"
50        );
51    }
52}
fluidattacks_blends_domain/syntax/error.rs

fluidattacks_blends_domain/syntax/
error.rs
