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mode.rs
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29 lines (25 loc) · 631 Bytes
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use core::fmt;
#[derive(Clone, Copy)]
pub enum Mode {
Program,
Statement,
}
impl core::str::FromStr for Mode {
type Err = ModeParseError;
fn from_str(s: &str) -> Result<Self, ModeParseError> {
match s {
"exec" | "single" => Ok(Mode::Program),
"eval" => Ok(Mode::Statement),
_ => Err(ModeParseError { _priv: () }),
}
}
}
#[derive(Debug)]
pub struct ModeParseError {
_priv: (),
}
impl fmt::Display for ModeParseError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, r#"mode should be "exec", "eval", or "single""#)
}
}