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34 lines
755 B
Rust
34 lines
755 B
Rust
// --- BytePredictor
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pub trait BytePredictor {
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fn predicate(&self, byte: u8) -> bool;
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}
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// --- Utf8BytePredictor
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pub trait Utf8BytePredictor {
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fn predicate(&self, byte: u8) -> bool;
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}
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// --- AnyAsciiChar
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pub struct AnyAsciiChar<'a>(&'a [u8]);
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impl<'a> AnyAsciiChar<'a> {
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#[cfg(windows)]
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pub const SEP: Self = Self(b"/\\");
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#[cfg(not(windows))]
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pub const SEP: Self = Self(b"/");
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pub fn new(chars: &'a [u8]) -> Option<Self> {
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if chars.iter().all(|&b| b <= 0x7f) { Some(Self(chars)) } else { None }
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}
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}
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impl Utf8BytePredictor for AnyAsciiChar<'_> {
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fn predicate(&self, byte: u8) -> bool { self.0.contains(&byte) }
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}
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impl<T> BytePredictor for T
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where
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T: Utf8BytePredictor,
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{
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fn predicate(&self, byte: u8) -> bool { self.predicate(byte) }
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}
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