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use crate::error::*;
#[derive(Debug, Clone)]
pub struct LineRange {
lower: usize,
upper: usize,
}
impl Default for LineRange {
fn default() -> LineRange {
LineRange {
lower: usize::min_value(),
upper: usize::max_value(),
}
}
}
impl LineRange {
pub fn new(from: usize, to: usize) -> Self {
LineRange {
lower: from,
upper: to,
}
}
pub fn from(range_raw: &str) -> Result<LineRange> {
LineRange::parse_range(range_raw)
}
fn parse_range(range_raw: &str) -> Result<LineRange> {
let mut new_range = LineRange::default();
if range_raw.bytes().next().ok_or("Empty line range")? == b':' {
new_range.upper = range_raw[1..].parse()?;
return Ok(new_range);
} else if range_raw.bytes().last().ok_or("Empty line range")? == b':' {
new_range.lower = range_raw[..range_raw.len() - 1].parse()?;
return Ok(new_range);
}
let line_numbers: Vec<&str> = range_raw.split(':').collect();
match line_numbers.len() {
1 => {
new_range.lower = line_numbers[0].parse()?;
new_range.upper = new_range.lower;
Ok(new_range)
}
2 => {
new_range.lower = line_numbers[0].parse()?;
new_range.upper = line_numbers[1].parse()?;
Ok(new_range)
}
_ => Err(
"Line range contained more than one ':' character. Expected format: 'N' or 'N:M'"
.into(),
),
}
}
pub(crate) fn is_inside(&self, line: usize) -> bool {
line >= self.lower && line <= self.upper
}
}
#[test]
fn test_parse_full() {
let range = LineRange::from("40:50").expect("Shouldn't fail on test!");
assert_eq!(40, range.lower);
assert_eq!(50, range.upper);
}
#[test]
fn test_parse_partial_min() {
let range = LineRange::from(":50").expect("Shouldn't fail on test!");
assert_eq!(usize::min_value(), range.lower);
assert_eq!(50, range.upper);
}
#[test]
fn test_parse_partial_max() {
let range = LineRange::from("40:").expect("Shouldn't fail on test!");
assert_eq!(40, range.lower);
assert_eq!(usize::max_value(), range.upper);
}
#[test]
fn test_parse_single() {
let range = LineRange::from("40").expect("Shouldn't fail on test!");
assert_eq!(40, range.lower);
assert_eq!(40, range.upper);
}
#[test]
fn test_parse_fail() {
let range = LineRange::from("40:50:80");
assert!(range.is_err());
let range = LineRange::from("40::80");
assert!(range.is_err());
let range = LineRange::from(":40:");
assert!(range.is_err());
}
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum RangeCheckResult {
// Within one of the given ranges
InRange,
// Before the first range or within two ranges
BeforeOrBetweenRanges,
// Line number is outside of all ranges and larger than the last range.
AfterLastRange,
}
#[derive(Debug, Clone)]
pub struct LineRanges {
ranges: Vec<LineRange>,
largest_upper_bound: usize,
}
impl LineRanges {
pub fn none() -> LineRanges {
LineRanges::from(vec![])
}
pub fn all() -> LineRanges {
LineRanges::from(vec![LineRange::default()])
}
pub fn from(ranges: Vec<LineRange>) -> LineRanges {
let largest_upper_bound = ranges
.iter()
.map(|r| r.upper)
.max()
.unwrap_or(usize::max_value());
LineRanges {
ranges,
largest_upper_bound,
}
}
pub(crate) fn check(&self, line: usize) -> RangeCheckResult {
if self.ranges.iter().any(|r| r.is_inside(line)) {
RangeCheckResult::InRange
} else if line < self.largest_upper_bound {
RangeCheckResult::BeforeOrBetweenRanges
} else {
RangeCheckResult::AfterLastRange
}
}
}
impl Default for LineRanges {
fn default() -> Self {
Self::all()
}
}
#[derive(Debug, Clone)]
pub struct HighlightedLineRanges(pub LineRanges);
impl Default for HighlightedLineRanges {
fn default() -> Self {
HighlightedLineRanges(LineRanges::none())
}
}
#[cfg(test)]
fn ranges(rs: &[&str]) -> LineRanges {
LineRanges::from(rs.iter().map(|r| LineRange::from(r).unwrap()).collect())
}
#[test]
fn test_ranges_simple() {
let ranges = ranges(&["3:8"]);
assert_eq!(RangeCheckResult::BeforeOrBetweenRanges, ranges.check(2));
assert_eq!(RangeCheckResult::InRange, ranges.check(5));
assert_eq!(RangeCheckResult::AfterLastRange, ranges.check(9));
}
#[test]
fn test_ranges_advanced() {
let ranges = ranges(&["3:8", "11:20", "25:30"]);
assert_eq!(RangeCheckResult::BeforeOrBetweenRanges, ranges.check(2));
assert_eq!(RangeCheckResult::InRange, ranges.check(5));
assert_eq!(RangeCheckResult::BeforeOrBetweenRanges, ranges.check(9));
assert_eq!(RangeCheckResult::InRange, ranges.check(11));
assert_eq!(RangeCheckResult::BeforeOrBetweenRanges, ranges.check(22));
assert_eq!(RangeCheckResult::InRange, ranges.check(28));
assert_eq!(RangeCheckResult::AfterLastRange, ranges.check(31));
}
#[test]
fn test_ranges_open_low() {
let ranges = ranges(&["3:8", ":5"]);
assert_eq!(RangeCheckResult::InRange, ranges.check(1));
assert_eq!(RangeCheckResult::InRange, ranges.check(3));
assert_eq!(RangeCheckResult::InRange, ranges.check(7));
assert_eq!(RangeCheckResult::AfterLastRange, ranges.check(9));
}
#[test]
fn test_ranges_open_high() {
let ranges = ranges(&["3:", "2:5"]);
assert_eq!(RangeCheckResult::BeforeOrBetweenRanges, ranges.check(1));
assert_eq!(RangeCheckResult::InRange, ranges.check(3));
assert_eq!(RangeCheckResult::InRange, ranges.check(5));
assert_eq!(RangeCheckResult::InRange, ranges.check(9));
}
#[test]
fn test_ranges_all() {
let ranges = LineRanges::all();
assert_eq!(RangeCheckResult::InRange, ranges.check(1));
}
#[test]
fn test_ranges_none() {
let ranges = LineRanges::none();
assert_ne!(RangeCheckResult::InRange, ranges.check(1));
}
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