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use nom::{
branch::alt,
character::complete::{alphanumeric0, char, one_of},
combinator::{opt, recognize},
multi::{many1, separated_list0, separated_list1},
sequence::{pair, tuple},
IResult,
};
fn upperalpha(s: &str) -> IResult<&str, char> {
one_of("ABCDEFGHIJKLMNOPQRSTUVWXYZ")(s)
}
fn loweralpha(s: &str) -> IResult<&str, char> {
one_of("abcdefghijklmnopqrstuvwxyz")(s)
}
fn numeric(s: &str) -> IResult<&str, char> {
one_of("0123456789")(s)
}
pub fn package_name(s: &str) -> IResult<&str, &str> {
recognize(tuple((
loweralpha,
opt(char('_')),
separated_list1(char('_'), many1(alt((loweralpha, numeric)))),
)))(s)
}
pub fn member_name(s: &str) -> IResult<&str, &str> {
recognize(tuple((
loweralpha,
opt(char('_')),
separated_list0(char('_'), many1(alt((loweralpha, numeric)))),
)))(s)
}
pub fn message_name(s: &str) -> IResult<&str, &str> {
recognize(pair(upperalpha, alphanumeric0))(s)
}
pub fn constant_name(s: &str) -> IResult<&str, &str> {
recognize(separated_list1(
char('_'),
many1(alt((upperalpha, numeric))),
))(s)
}
#[cfg(test)]
mod test {
use anyhow::Result;
use super::*;
#[test]
fn parse_member_name() -> Result<()> {
assert_eq!(member_name("abc034_fs3_u3")?.1, "abc034_fs3_u3");
Ok(())
}
#[test]
fn parse_member_name_should_fail_if_starting_with_underscore() {
assert!(member_name("_invalid_identifier").is_err());
}
#[test]
fn parse_member_name_should_fail_if_starting_with_number() {
assert!(member_name("0invalid_identifier").is_err());
}
#[test]
fn parse_message_name() -> Result<()> {
assert_eq!(message_name("StdMsgs12")?.1, "StdMsgs12");
Ok(())
}
#[test]
fn parse_message_name_should_fail_if_starting_with_wrong_char() {
assert!(message_name("aStdMsgs12").is_err());
}
#[test]
fn parse_constant_name() -> Result<()> {
assert_eq!(constant_name("C_O_N_STAN_T")?.1, "C_O_N_STAN_T");
Ok(())
}
#[test]
fn parse_constant_name_should_fail_if_starting_with_underscore() {
assert!(constant_name("_C_O_N_STAN_Ta").is_err());
}
}
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