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|
use std::convert::{TryFrom, TryInto};
use regex::Regex;
use smol_str::SmolStr;
use unicode_segmentation::UnicodeSegmentation;
use crate::features::side_by_side::ansifill::ODD_PAD_CHAR;
#[derive(Debug, PartialEq, Eq)]
pub enum Placeholder<'a> {
NumberMinus,
NumberPlus,
Str(&'a str),
}
impl<'a> TryFrom<Option<&'a str>> for Placeholder<'a> {
type Error = ();
fn try_from(from: Option<&'a str>) -> Result<Self, Self::Error> {
match from {
Some(placeholder) if placeholder == "nm" => Ok(Placeholder::NumberMinus),
Some(placeholder) if placeholder == "np" => Ok(Placeholder::NumberPlus),
Some(placeholder) => Ok(Placeholder::Str(placeholder)),
_ => Err(()),
}
}
}
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub enum Align {
Left,
Center,
Right,
}
impl TryFrom<Option<&str>> for Align {
type Error = ();
fn try_from(from: Option<&str>) -> Result<Self, Self::Error> {
// inlined format args are not supported for `debug_assert` with edition 2018.
#[allow(clippy::uninlined_format_args)]
match from {
Some(alignment) if alignment == "<" => Ok(Align::Left),
Some(alignment) if alignment == ">" => Ok(Align::Right),
Some(alignment) if alignment == "^" => Ok(Align::Center),
Some(alignment) => {
debug_assert!(false, "Unknown Alignment: {}", alignment);
Err(())
}
None => Err(()),
}
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct FormatStringPlaceholderDataAnyPlaceholder<T> {
pub prefix: SmolStr,
pub prefix_len: usize,
pub placeholder: Option<T>,
pub alignment_spec: Option<Align>,
pub width: Option<usize>,
pub precision: Option<usize>,
pub fmt_type: SmolStr,
pub suffix: SmolStr,
pub suffix_len: usize,
}
impl<T> Default for FormatStringPlaceholderDataAnyPlaceholder<T> {
fn default() -> Self {
Self {
prefix: SmolStr::default(),
prefix_len: 0,
placeholder: None,
alignment_spec: None,
width: None,
precision: None,
fmt_type: SmolStr::default(),
suffix: SmolStr::default(),
suffix_len: 0,
}
}
}
impl<T> FormatStringPlaceholderDataAnyPlaceholder<T> {
pub fn only_string(s: &str) -> Self {
Self {
suffix: s.into(),
suffix_len: s.graphemes(true).count(),
..Self::default()
}
}
}
pub type FormatStringPlaceholderData<'a> =
FormatStringPlaceholderDataAnyPlaceholder<Placeholder<'a>>;
pub type FormatStringSimple = FormatStringPlaceholderDataAnyPlaceholder<()>;
impl<'a> FormatStringPlaceholderData<'a> {
pub fn width(&self, hunk_max_line_number_width: usize) -> (usize, usize) {
// Only if Some(placeholder) is present will there be a number formatted
// by this placeholder, if not width is also None.
(
self.prefix_len
+ std::cmp::max(
self.placeholder
.as_ref()
.map_or(0, |_| hunk_max_line_number_width),
self.width.unwrap_or(0),
),
self.suffix_len,
)
}
pub fn into_simple(self) -> FormatStringSimple {
FormatStringSimple {
prefix: self.prefix,
prefix_len: self.prefix_len,
placeholder: None,
alignment_spec: self.alignment_spec,
width: self.width,
precision: self.precision,
fmt_type: self.fmt_type,
suffix: self.suffix,
suffix_len: self.suffix_len,
}
}
}
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 (optional)
(?: # Start optional precision (non-capturing)
\.(\d+) # 5: Precision
)? #
(?: # Start optional format type (non-capturing)
_?([A-Za-z][0-9A-Za-z_-]*) # 6: Format type, optional leading _
)? #
)? #
\}}
",
labels.join("|")
))
.unwrap()
}
// The resulting vector is never empty
pub fn parse_line_number_format<'a>(
format_string: &'a str,
placeholder_regex: &Regex,
mut prefix_with_space: bool,
) -> FormatStringData<'a> {
let mut format_data = Vec::new();
let mut offset = 0;
let mut expand_first_prefix = |prefix: SmolStr| {
// Only prefix the first placeholder with a space, also see `UseFullPanelWidth`
if prefix_with_space {
let prefix = SmolStr::new(format!("{ODD_PAD_CHAR}{prefix}"));
prefix_with_space = false;
prefix
} else {
prefix
}
};
for captures in placeholder_regex.captures_iter(format_string) {
let match_ = captures.get(0).unwrap();
l
|