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use std::collections::HashMap;
use winnow::prelude::*;
use winnow::{
ascii::{alphanumeric1 as alphanumeric, space0 as space},
combinator::opt,
combinator::repeat,
combinator::{delimited, terminated},
token::{take_till0, take_while},
};
pub type Stream<'i> = &'i str;
pub fn categories<'s>(
input: &mut Stream<'s>,
) -> PResult<HashMap<&'s str, HashMap<&'s str, &'s str>>> {
repeat(0.., category_and_keys).parse_next(input)
}
fn category_and_keys<'s>(i: &mut Stream<'s>) -> PResult<(&'s str, HashMap<&'s str, &'s str>)> {
(category, keys_and_values).parse_next(i)
}
fn category<'s>(i: &mut Stream<'s>) -> PResult<&'s str> {
terminated(
delimited('[', take_while(0.., |c| c != ']'), ']'),
opt(take_while(1.., [' ', '\r', '\n'])),
)
.parse_next(i)
}
fn keys_and_values<'s>(input: &mut Stream<'s>) -> PResult<HashMap<&'s str, &'s str>> {
repeat(0.., key_value).parse_next(input)
}
fn key_value<'s>(i: &mut Stream<'s>) -> PResult<(&'s str, &'s str)> {
let key = alphanumeric.parse_next(i)?;
let _ = (opt(space), "=", opt(space)).parse_next(i)?;
let val = take_till0(is_line_ending_or_comment).parse_next(i)?;
let _ = opt(space).parse_next(i)?;
let _ = opt((";", not_line_ending)).parse_next(i)?;
let _ = opt(space_or_line_ending).parse_next(i)?;
Ok((key, val))
}
fn is_line_ending_or_comment(chr: char) -> bool {
chr == ';' || chr == '\n'
}
fn not_line_ending<'s>(i: &mut Stream<'s>) -> PResult<&'s str> {
take_while(0.., |c| c != '\r' && c != '\n').parse_next(i)
}
fn space_or_line_ending<'s>(i: &mut Stream<'s>) -> PResult<&'s str> {
take_while(1.., [' ', '\r', '\n']).parse_next(i)
}
#[test]
fn parse_category_test() {
let ini_file = "[category]
parameter=value
key = value2";
let ini_without_category = "parameter=value
key = value2";
let res = category.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, o)) => println!("i: {} | o: {:?}", i, o),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_category, "category")));
}
#[test]
fn parse_key_value_test() {
let ini_file = "parameter=value
key = value2";
let ini_without_key_value = "key = value2";
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {} | o: ({:?},{:?})", i, o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_key_value_with_space_test() {
let ini_file = "parameter = value
key = value2";
let ini_without_key_value = "key = value2";
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {} | o: ({:?},{:?})", i, o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_key_value_with_comment_test() {
let ini_file = "parameter=value;abc
key = value2";
let ini_without_key_value = "key = value2";
let res = key_value.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, (o1, o2))) => println!("i: {} | o: ({:?},{:?})", i, o1, o2),
_ => println!("error"),
}
assert_eq!(res, Ok((ini_without_key_value, ("parameter", "value"))));
}
#[test]
fn parse_multiple_keys_and_values_test() {
let ini_file = "parameter=value;abc
key = value2
[category]";
let ini_without_key_value = "[category]";
let res = keys_and_values.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, ref o)) => println!("i: {} | o: {:?}", i, o),
_ => println!("error"),
}
let mut expected: HashMap<&str, &str> = HashMap::new();
expected.insert("parameter", "value");
expected.insert("key", "value2");
assert_eq!(res, Ok((ini_without_key_value, expected)));
}
#[test]
fn parse_category_then_multiple_keys_and_values_test() {
//FIXME: there can be an empty line or a comment line after a category
let ini_file = "[abcd]
parameter=value;abc
key = value2
[category]";
let ini_after_parser = "[category]";
let res = category_and_keys.parse_peek(ini_file);
println!("{:?}", res);
match res {
Ok((i, ref o)) => println!("i: {} | o: {:?}", i, o),
_ => println!("error"),
}
let mut expected_h: HashMap<&str, &str> = HashMap::new();
expected_h.insert("parameter", "value");
expected_h.insert("key", "value2");
assert_eq!(res, Ok((ini_after_parser, ("abcd", expected_h))));
}
#[test]
fn parse_multiple_categories_test() {
let ini_file = "[abcd]
parameter=value;abc
key = value2
[category]
parameter3=value3
key4 = value4
";
let res = categories.parse_peek(ini_file);
//println!("{:?}", res);
match res {
Ok((i, ref o)) => println!("i: {} | o: {:?}", i, o),
_ => println!("error"),
}
let mut expected_1: HashMap<&str, &str> = HashMap::new();
expected_1.insert("parameter", "value");
expected_1.insert("key", "value2");
let mut expected_2: HashMap<&str, &str> = HashMap::new();
expected_2.insert("parameter3", "value3");
expected_2.insert("key4", "value4");
let mut expected_h: HashMap<&str, HashMap<&str, &str>> = HashMap::new();
expected_h.insert("abcd", expected_1);
expected_h.insert("category", expected_2);
assert_eq!(res, Ok(("", expected_h)));
}
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