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52 lines
1.6 KiB
Rust
52 lines
1.6 KiB
Rust
use crate::wchar::prelude::*;
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/// Adjust a pattern so that it is anchored at both beginning and end.
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/// This is a workaround for the fact that PCRE2_ENDANCHORED is unavailable on pre-2017 PCRE2
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/// (e.g. 10.21, on Xenial).
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pub fn regex_make_anchored(pattern: &wstr) -> WString {
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// PATTERN -> ^(:?PATTERN)$.
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let prefix = L!("^(?:");
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let suffix = L!(")$");
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let mut anchored = WString::with_capacity(prefix.len() + pattern.len() + suffix.len());
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anchored.push_utfstr(prefix);
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anchored.push_utfstr(pattern);
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anchored.push_utfstr(suffix);
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anchored
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}
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/// Copy a wstr to a Box<[char]>.
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pub fn to_boxed_chars(s: &wstr) -> Box<[char]> {
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let chars = s.as_char_slice();
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chars.into()
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}
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#[test]
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fn test_regex_make_anchored() {
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use pcre2::utf32::{Regex, RegexBuilder};
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fn test_match(re: &Regex, subject: &wstr) -> bool {
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re.is_match(&to_boxed_chars(subject)).unwrap()
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}
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let builder = RegexBuilder::new();
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let result = builder.build(to_boxed_chars(®ex_make_anchored(L!("ab(.+?)"))));
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assert!(result.is_ok());
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let re = &result.unwrap();
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assert!(!test_match(re, L!("")));
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assert!(!test_match(re, L!("ab")));
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assert!(test_match(re, L!("abcd")));
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assert!(!test_match(re, L!("xabcd")));
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assert!(test_match(re, L!("abcdefghij")));
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let result = builder.build(to_boxed_chars(®ex_make_anchored(L!("(a+)|(b+)"))));
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assert!(result.is_ok());
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let re = &result.unwrap();
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assert!(!test_match(re, L!("")));
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assert!(!test_match(re, L!("aabb")));
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assert!(test_match(re, L!("aaaa")));
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assert!(test_match(re, L!("bbbb")));
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assert!(!test_match(re, L!("aaaax")));
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}
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