ere_core/
config.rs

1#[derive(Debug, Clone, Copy, PartialEq, Eq)]
2pub enum AmbiguousSubmatchMode {
3    /// While not POSIX standard, the greedy method for determining ambiguous submatches is
4    /// able to be implemented the most efficiently in the general case.
5    /// This is based on the popular Perl regex rules for ambiguous submatching.
6    ///
7    /// - Quantifiers match as much as possible while allowing the rest to match
8    /// - Alternations prioritize the earlier options
9    /// - Since it is greedy, the leftmost quantifier/alternations will match first.
10    Greedy,
11    // /// The mode based on `REG_MINIMAL=false` in C header [`<regex.h>`](https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/regex.h.html).
12    // /// While the crate attempts to provide optimizations, there are no known ways to implement this as efficiently as the greedy mode.
13    // ERELongest,
14    // /// The mode based on `REG_MINIMAL=true` in C header [`<regex.h>`](https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/regex.h.html)
15    // /// While the crate attempts to provide optimizations, there are no known ways to implement this as efficiently as the greedy mode.
16    // EREShortest,
17}
18
19#[derive(Debug, Clone)]
20pub struct Config {
21    // case_insensitive: bool,
22    /// When finding submatches during [`crate::Regex::exec`], determines the rules for what should happen if the
23    /// capture group submatches are ambiguous (e.g. `^(a*)(a*)$` on `aaaa` is ambiguous as to which capture group gets how many `a`'s).
24    ambiguous_submatches: AmbiguousSubmatchMode,
25}
26impl Config {
27    pub const fn quantifiers_prefer_longest(&self) -> bool {
28        return match self.ambiguous_submatches {
29            AmbiguousSubmatchMode::Greedy => true,
30        };
31    }
32    pub const fn builder() -> ConfigBuilder {
33        return ConfigBuilder::new();
34    }
35    pub const fn const_default() -> Self {
36        return Config {
37            ambiguous_submatches: AmbiguousSubmatchMode::Greedy,
38        };
39    }
40}
41impl Default for Config {
42    fn default() -> Self {
43        return Config::const_default();
44    }
45}
46
47#[derive(Debug)]
48pub struct ConfigBuilder(Config);
49impl ConfigBuilder {
50    pub const fn new() -> ConfigBuilder {
51        return ConfigBuilder(Config::const_default());
52    }
53    pub const fn build(self) -> Config {
54        return self.0;
55    }
56    pub const fn greedy(mut self) -> ConfigBuilder {
57        self.0.ambiguous_submatches = AmbiguousSubmatchMode::Greedy;
58        return self;
59    }
60}
ere_core/config.rs

ere_core/
config.rs
