fee/
error.rs

1use std::borrow::Cow;
2
3use thiserror::Error;
4
5#[derive(Debug, Error, PartialEq)]
6pub enum Error<'a>
7{
8    #[error("unknown variable '{0}'")]
9    UnknownVar(Cow<'a, str>),
10
11    #[error("unknown function '{0}'")]
12    UnknownFn(Cow<'a, str>),
13
14    #[error("parse error: {0}")]
15    ParseError(ParseError<'a>),
16
17    #[error("eval error: {0}")]
18    EvalError(EvalError),
19
20    #[error("internal invariant: {0}")]
21    InternalInvariant(String),
22}
23
24#[derive(Debug, Error, PartialEq)]
25pub enum ParseError<'a>
26{
27    #[error("unexpected character '{0}' at {1}")]
28    UnexpectedChar(Cow<'a, char>, usize),
29
30    #[error("invalid number '{0}' at {1}")]
31    InvalidNumber(Cow<'a, str>, usize),
32
33    #[error("unmatched parentheses at {0}")]
34    UnmatchedParentheses(usize),
35
36    #[error("unexpected expresison end")]
37    UnexpectedEnd,
38}
39
40#[derive(Debug, Error, PartialEq)]
41pub enum EvalError
42{
43    #[error("RPN stack underflow")]
44    RPNStackUnderflow,
45
46    #[error("malformed expression")]
47    MalformedExpression,
48}
fee/error.rs

fee/
error.rs
