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use nom::{
bytes::complete::{is_a, tag, take_till, take_while},
character::complete::{alphanumeric1 as alphanumeric, char, space0 as space},
combinator::opt,
multi::many0,
sequence::{delimited, pair, terminated, tuple},
IResult,
};
use std::collections::HashMap;
fn is_line_ending_or_comment(chr: char) -> bool {
chr == ';' || chr == '\n'
}
fn not_line_ending(i: &str) -> IResult<&str, &str> {
take_while(|c| c != '\r' && c != '\n')(i)
}
fn space_or_line_ending(i: &str) -> IResult<&str, &str> {
is_a(" \r\n")(i)
}
fn category(i: &str) -> IResult<&str, &str> {
terminated(
delimited(char('['), take_while(|c| c != ']'), char(']')),
opt(is_a(" \r\n")),
)(i)
}
fn key_value(i: &str) -> IResult<&str, (&str, &str)> {
let (i, key) = alphanumeric(i)?;
let (i, _) = tuple((opt(space), tag("="), opt(space)))(i)?;
let (i, val) = take_till(is_line_ending_or_comment)(i)?;
let (i, _) = opt(space)(i)?;
let (i, _) = opt(pair(tag(";"), not_line_ending))(i)?;
let (i, _) = opt(space_or_line_ending)(i)?;
Ok((i, (key, val)))
}
fn keys_and_values_aggregator(i: &str) -> IResult<&str, Vec<(&str, &str)>> {
many0(key_value)(i)
}
fn keys_and_values(input: &str) -> IResult<&str, HashMap<&str, &str>> {
match keys_and_values_aggregator(input) {
Ok((i, tuple_vec)) => Ok((i, tuple_vec.into_iter().collect())),
Err(e) => Err(e),
}
}
fn category_and_keys(i: &str) -> IResult<&str, (&str, HashMap<&str, &str>)> {
pair(category, keys_and_values)(i)
}
fn categories_aggregator(i: &str) -> IResult<&str, Vec<(&str, HashMap<&str, &str>)>> {
many0(category_and_keys)(i)
}
fn categories(input: &str) -> IResult<&str, HashMap<&str, HashMap<&str, &str>>> {
match categories_aggregator(input) {
Ok((i, tuple_vec)) => Ok((i, tuple_vec.into_iter().collect())),
Err(e) => Err(e),
}
}
#[test]
fn parse_category_test() {
let ini_file = "[category]
parameter=value
key = value2";
let ini_without_category = "parameter=value
key = value2";
let res = category(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(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(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(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(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(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(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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