jsonc_parser/
common.rs

1/// Positional information about a start and end point in the text.
2#[derive(Debug, PartialEq, Clone, Copy)]
3pub struct Range {
4  /// Start position of the node in the text.
5  pub start: usize,
6  /// End position of the node in the text.
7  pub end: usize,
8}
9
10impl Range {
11  pub fn new(start: usize, end: usize) -> Self {
12    Range { start, end }
13  }
14
15  pub fn from_byte_index(pos: usize) -> Self {
16    Range::new(pos, pos)
17  }
18}
19
20impl Ranged for Range {
21  fn range(&self) -> Range {
22    *self
23  }
24}
25
26/// Adds the digit serde_json needs beside a leading or trailing decimal point (ex. `.5` to `0.5`).
27#[cfg(feature = "serde_json")]
28pub(crate) fn fill_bare_decimal_point(num: &str) -> std::borrow::Cow<'_, str> {
29  let Some(dot) = num.find('.') else {
30    return std::borrow::Cow::Borrowed(num);
31  };
32  let before = num[..dot].ends_with(|c: char| c.is_ascii_digit());
33  let after = num[dot + 1..].starts_with(|c: char| c.is_ascii_digit());
34  if before && after {
35    return std::borrow::Cow::Borrowed(num);
36  }
37  let mut filled = String::with_capacity(num.len() + 1);
38  filled.push_str(&num[..dot]);
39  filled.push_str(if before { ".0" } else { "0." });
40  filled.push_str(&num[dot + 1..]);
41  std::borrow::Cow::Owned(filled)
42}
43
44/// Represents an object that has a range in the text.
45pub trait Ranged {
46  /// Gets the range.
47  fn range(&self) -> Range;
48
49  /// Gets the byte index of the first character in the text.
50  fn start(&self) -> usize {
51    self.range().start
52  }
53
54  /// Gets the byte index after the last character in the text.
55  fn end(&self) -> usize {
56    self.range().end
57  }
58
59  /// Gets the text from the provided string.
60  fn text<'a>(&self, text: &'a str) -> &'a str {
61    let range = self.range();
62    &text[range.start..range.end]
63  }
64
65  /// Gets the end byte index minus the start byte index of the range.
66  fn width(&self) -> usize {
67    let range = self.range();
68    range.end - range.start
69  }
70}
jsonc_parser/common.rs

jsonc_parser/
common.rs
