tinyparse/
error.rs

1use std::{fmt::Display, error::Error};
2use crate::{Span, FrozenSpan};
3
4#[derive(Debug, PartialEq)]
5pub struct ParseError {
6    span: FrozenSpan,
7    //grammar_string: String,
8    kind: ParseErrorKind,
9}
10
11impl ParseError {
12    pub fn new<'a>(span: Span<'a>, kind: ParseErrorKind) -> ParseError {
13        ParseError { span: span.frozen(), kind, /*grammar_string: String::from("<unknown>")*/ }
14    }
15}
16
17impl Error for ParseError {}
18
19#[derive(Debug, PartialEq)]
20pub enum ParseErrorKind {
21    Starving { found: usize, required: usize },
22    Unexpected { found: String, expected: String },
23    Neither(Vec<ParseError>),
24    ConditionFailed,
25    Other,
26}
27
28impl Display for ParseErrorKind {
29    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
30        match &self {
31            ParseErrorKind::Starving { found, required } => write!(f, "Found {} units but expected {}.", found, required),
32            ParseErrorKind::Unexpected { found, expected } => write!(f, "Unexpected: '{}', Expected: '{}'", found, expected),
33            ParseErrorKind::Neither(errors) => write!(f, "Neither parser succeeded: {:?}", errors),
34            ParseErrorKind::ConditionFailed => write!(f, "Condition failed."),
35            ParseErrorKind::Other => write!(f, "Unknown error.")
36        }
37    }
38}
39
40impl Display for ParseError {
41    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
42        //write!(f, "(input) -> {}: {}", self.grammar_string, self.kind)
43        write!(f, "{}", self.kind)
44    }
45}
46
47pub type ParseResult<'a, T> = std::result::Result<(Span<'a>, T), ParseError>;
tinyparse/error.rs

tinyparse/
error.rs
