mirror of https://github.com/sharkdp/fd.git
53 lines
1.8 KiB
Rust
53 lines
1.8 KiB
Rust
use regex_syntax::hir::Hir;
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use regex_syntax::ParserBuilder;
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/// Determine if a regex pattern contains a literal uppercase character.
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pub fn pattern_has_uppercase_char(pattern: &str) -> bool {
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let mut parser = ParserBuilder::new().allow_invalid_utf8(true).build();
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parser
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.parse(pattern)
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.map(|hir| hir_has_uppercase_char(&hir))
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.unwrap_or(false)
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}
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/// Determine if a regex expression contains a literal uppercase character.
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fn hir_has_uppercase_char(hir: &Hir) -> bool {
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use regex_syntax::hir::*;
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match *hir.kind() {
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HirKind::Literal(Literal::Unicode(c)) => c.is_uppercase(),
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HirKind::Literal(Literal::Byte(b)) => char::from(b).is_uppercase(),
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HirKind::Class(Class::Unicode(ref ranges)) => ranges
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.iter()
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.any(|r| r.start().is_uppercase() || r.end().is_uppercase()),
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HirKind::Class(Class::Bytes(ref ranges)) => ranges
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.iter()
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.any(|r| char::from(r.start()).is_uppercase() || char::from(r.end()).is_uppercase()),
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HirKind::Group(Group { ref hir, .. }) | HirKind::Repetition(Repetition { ref hir, .. }) => {
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hir_has_uppercase_char(hir)
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}
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HirKind::Concat(ref hirs) | HirKind::Alternation(ref hirs) => {
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hirs.iter().any(hir_has_uppercase_char)
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}
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_ => false,
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}
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}
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#[test]
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fn pattern_has_uppercase_char_simple() {
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assert!(pattern_has_uppercase_char("A"));
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assert!(pattern_has_uppercase_char("foo.EXE"));
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assert!(!pattern_has_uppercase_char("a"));
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assert!(!pattern_has_uppercase_char("foo.exe123"));
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}
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#[test]
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fn pattern_has_uppercase_char_advanced() {
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assert!(pattern_has_uppercase_char("foo.[a-zA-Z]"));
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assert!(!pattern_has_uppercase_char(r"\Acargo"));
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assert!(!pattern_has_uppercase_char(r"carg\x6F"));
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}
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