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Refactor: module for working with format strings
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,76 @@ | ||
| use regex::Regex; | ||
|
|
||
| #[derive(Debug, Default, PartialEq)] | ||
| pub struct FormatStringPlaceholderData<'a> { | ||
| pub prefix: &'a str, | ||
| pub placeholder: Option<&'a str>, | ||
| pub alignment_spec: Option<&'a str>, | ||
| pub width: Option<usize>, | ||
| pub suffix: &'a str, | ||
| } | ||
|
|
||
| pub type FormatStringData<'a> = Vec<FormatStringPlaceholderData<'a>>; | ||
|
|
||
| pub fn make_placeholder_regex(labels: &[&str]) -> Regex { | ||
| Regex::new(&format!( | ||
| r"(?x) | ||
| \{{ | ||
| ({}) # 1: Placeholder labels | ||
| (?: # Start optional format spec (non-capturing) | ||
| : # Literal colon | ||
| (?: # Start optional fill/alignment spec (non-capturing) | ||
| ([^<^>])? # 2: Optional fill character (ignored) | ||
| ([<^>]) # 3: Alignment spec | ||
| )? # | ||
| (\d+) # 4: Width | ||
| )? # | ||
| \}} | ||
| ", | ||
| labels.join("|") | ||
| )) | ||
| .unwrap() | ||
| } | ||
|
|
||
| pub fn parse_line_number_format<'a>( | ||
| format_string: &'a str, | ||
| placeholder_regex: &Regex, | ||
| ) -> FormatStringData<'a> { | ||
| let mut format_data = Vec::new(); | ||
| let mut offset = 0; | ||
|
|
||
| for captures in placeholder_regex.captures_iter(format_string) { | ||
| let _match = captures.get(0).unwrap(); | ||
| format_data.push(FormatStringPlaceholderData { | ||
| prefix: &format_string[offset.._match.start()], | ||
| placeholder: captures.get(1).map(|m| m.as_str()), | ||
| alignment_spec: captures.get(3).map(|m| m.as_str()), | ||
| width: captures.get(4).map(|m| { | ||
| m.as_str() | ||
| .parse() | ||
| .unwrap_or_else(|_| panic!("Invalid width in format string: {}", format_string)) | ||
| }), | ||
| suffix: &format_string[_match.end()..], | ||
| }); | ||
| offset = _match.end(); | ||
| } | ||
| if offset == 0 { | ||
| // No placeholders | ||
| format_data.push(FormatStringPlaceholderData { | ||
| prefix: &format_string[..0], | ||
| placeholder: None, | ||
| alignment_spec: None, | ||
| width: None, | ||
| suffix: &format_string[0..], | ||
| }) | ||
| } | ||
| format_data | ||
| } | ||
|
|
||
| pub fn pad(s: &str, width: usize, alignment: &str) -> String { | ||
| match alignment { | ||
| "<" => format!("{0:<1$}", s, width), | ||
| "^" => format!("{0:^1$}", s, width), | ||
| ">" => format!("{0:>1$}", s, width), | ||
| _ => unreachable!(), | ||
| } | ||
| } |
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