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use nom::{
do_parse,
error::{VerboseError, VerboseErrorKind},
named, separated_list1, tag, take_till1, take_while1, IResult,
};
use std::borrow::Cow;
use std::fmt::Debug;
use crate::{AtLeastOne, PropertyValue, TypeOrRaw};
pub trait Parse<'a>: Sized {
fn parse(input: &'a str) -> IResult<&'a str, Self, ParseError>;
}
pub trait Parsable<'de>: PropertyValue + Parse<'de> {}
impl<'de, T> Parsable<'de> for T where T: PropertyValue + Parse<'de> {}
pub fn to_parse_error<'a>(input: &'a str, err: nom::error::Error<&'a str>) -> ParseError<'a> {
let errors = vec![(input, nom::error::VerboseErrorKind::Nom(err.code))];
let error = nom::error::VerboseError { errors };
ParseError(error)
}
#[derive(Debug, PartialEq)]
pub struct ParseError<'a>(pub(crate) VerboseError<&'a str>);
impl<'a> From<VerboseError<&'a str>> for ParseError<'a> {
fn from(f: VerboseError<&'a str>) -> ParseError<'a> {
ParseError(f)
}
}
impl<'a> ParseError<'a> {
pub fn display(self, data: &'a str) -> String {
nom::error::convert_error(data, self.0)
}
}
impl<'a> Parse<'a> for chrono::NaiveDate {
fn parse(input: &'a str) -> IResult<&'a str, Self, ParseError> {
match chrono::NaiveDate::parse_from_str(input, crate::DATE_FORMAT) {
Ok(date) => Ok(("", date)),
Err(_) => {
let error = VerboseError {
errors: vec![(input, VerboseErrorKind::Context("Failed to parse Datetime"))],
};
Err(nom::Err::Error(ParseError(error)))
}
}
}
}
impl<'a> Parse<'a> for std::borrow::Cow<'a, str> {
fn parse(input: &'a str) -> IResult<&'a str, Self, ParseError> {
Ok(("", input.into()))
}
}
pub fn parse_typed_value<'de, T>(
input: &'de str,
) -> IResult<&'de str, TypeOrRaw<T>, VerboseError<&'de str>>
where
T: Parsable<'de>,
{
match T::parse(&input) {
Ok((remains, item)) => Ok((remains, TypeOrRaw::Type(item))),
Err(_) => parse_value(input).map(|(a, b)| (a, TypeOrRaw::Raw(b.to_string().into()))),
}
}
pub fn parse_multiple_value(
input: &str,
) -> IResult<&str, AtLeastOne<Cow<'_, str>>, VerboseError<&str>> {
match parse_comma_seperated_value(input) {
Err(err) => Err(err),
Ok((remains, mut list)) => {
if list.len() == 1 {
Ok((remains, AtLeastOne::Single(list.remove(0))))
} else {
Ok((remains, AtLeastOne::Multiple(list)))
}
}
}
}
named!(parse_comma_seperated_value<&str, Vec<Cow<str>>, VerboseError<&str>>, do_parse!(
data: separated_list1!(tag!(","), parse_until_comma) >>
(data)
));
fn parse_until_comma<'de>(input: &'de str) -> IResult<&'de str, Cow<str>, VerboseError<&'de str>> {
let (remains, data) = nom::bytes::complete::take_until(",")(input)?;
Ok((remains, data.into()))
}
named!(pub(crate) parse_value<&str, Cow<str>, VerboseError<&str>>, do_parse!(
value: take_until_unescaped_newline >>
(value)
));
fn take_until_unescaped_newline(input: &str) -> IResult<&str, Cow<'_, str>, VerboseError<&str>> {
let mut escaped = false;
for (index, chr) in input.chars().enumerate() {
if chr == '\\' {
escaped = true;
} else if chr == '\n' {
if !escaped {
return Ok((&input[index..], input[..index].into()));
}
} else {
escaped = false;
}
}
Err(nom::Err::Incomplete(nom::Needed::Unknown))
}
named!(pub(crate) parse_name<&str, Cow<str>, VerboseError<&str>>, do_parse!(
value: take_till1!(|x| x == ':' || x == '=' || x == ';') >>
(value.into())
));
named!(pub(crate) parse_formatted_value<&str, Cow<'_, str>>, do_parse!(
data: take_while1!(|x| !",;\n".contains(x)) >>
(Cow::Borrowed(data))
));