c12_parser/
ini.rs

1use std::collections::HashMap;
2use std::fmt::Write as _;
3
4/// Parses an INI string into a simple nested map structure:
5/// `HashMap<section, HashMap<key, Option<value>>>`.
6///
7/// Style/indentation are not preserved.
8pub fn parse_ini(text: &str) -> HashMap<String, HashMap<String, Option<String>>> {
9    ini::inistr!(text)
10}
11
12/// Stringifies an INI-like nested map back into INI text.
13///
14/// Note: This does **not** preserve exact original formatting.
15pub fn stringify_ini(map: &HashMap<String, HashMap<String, Option<String>>>) -> String {
16    let mut out = String::new();
17    for (section, kv) in map {
18        if !section.eq_ignore_ascii_case("default") {
19            let _ = writeln!(&mut out, "[{}]", section);
20        }
21        for (key, value) in kv {
22            match value {
23                Some(v) => {
24                    let _ = writeln!(&mut out, "{} = {}", key, v);
25                }
26                None => {
27                    let _ = writeln!(&mut out, "{}", key);
28                }
29            }
30        }
31    }
32    out
33}
34
35#[cfg(test)]
36mod tests {
37    use super::*;
38
39    /// Sample document used by parse/stringify tests.
40    const FIXTURE: &str = r#"
41[types]
42boolean = true
43integer = 1
44float = 3.14
45string = hello
46array[] = 1
47array[] = 2
48array[] = 3
49object.key = value
50null = null
51date = 1979-05-27T15:32:00.000Z
52"#;
53
54    #[test]
55    fn parse_ok() {
56        let map = parse_ini(FIXTURE);
57        assert!(map.contains_key("types"));
58        let types = &map["types"];
59        assert_eq!(
60            types.get("boolean").and_then(|v| v.as_deref()),
61            Some("true")
62        );
63        assert_eq!(types.get("integer").and_then(|v| v.as_deref()), Some("1"));
64        assert_eq!(types.get("float").and_then(|v| v.as_deref()), Some("3.14"));
65        assert_eq!(
66            types.get("string").and_then(|v| v.as_deref()),
67            Some("hello")
68        );
69    }
70
71    #[test]
72    fn stringify_roundtrip() {
73        let map = parse_ini(FIXTURE);
74        let out = stringify_ini(&map);
75
76        let reparsed = parse_ini(&out);
77        assert_eq!(reparsed, map);
78    }
79
80    #[test]
81    fn handles_default_section_without_header() {
82        let ini = r#"
83key1 = value1
84
85[section]
86key2 = value2
87"#;
88
89        let map = parse_ini(ini);
90
91        assert!(map.contains_key("default"));
92        let default = &map["default"];
93        assert_eq!(
94            default.get("key1").and_then(|v| v.as_deref()),
95            Some("value1")
96        );
97    }
98}
c12_parser/ini.rs

c12_parser/
ini.rs
