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use super::{Error, Result};
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct CharSet {
bytes: [bool; 256],
}
impl Default for CharSet {
fn default() -> Self {
Self::new()
}
}
impl CharSet {
pub const fn new() -> Self {
CharSet {
bytes: [false; 256],
}
}
pub const fn full() -> Self {
CharSet { bytes: [true; 256] }
}
pub fn add_byte(&mut self, b: u8) {
self.bytes[b as usize] = true;
}
pub fn add_range(&mut self, start: u8, end: u8) -> Result<()> {
if start > end {
return Err(Error::Parser(
"invalid range in character class".to_string(),
));
}
for b in start..=end {
self.add_byte(b);
}
Ok(())
}
pub fn add_class(&mut self, class_byte: u8) -> Result<()> {
match class_byte {
b'a' => {
for b in b'a'..=b'z' {
self.add_byte(b);
}
for b in b'A'..=b'Z' {
self.add_byte(b);
}
}
b'c' => {
for b in 0x00..=0x1f {
self.add_byte(b);
}
self.add_byte(0x7f);
}
b'd' => {
for b in b'0'..=b'9' {
self.add_byte(b);
}
}
b'g' => {
for b in 0x21..=0x7e {
self.add_byte(b);
}
}
b'l' => {
for b in b'a'..=b'z' {
self.add_byte(b);
}
}
b'p' => {
for b in 0x20..=0x7e {
if !((b'a'..=b'z').contains(&b)
|| (b'A'..=b'Z').contains(&b)
|| (b'0'..=b'9').contains(&b))
{
self.add_byte(b);
}
}
}
b's' => {
for &b in &[b' ', b'\t', b'\n', b'\r', 0x0b, 0x0c] {
self.add_byte(b);
}
}
b'u' => {
for b in b'A'..=b'Z' {
self.add_byte(b);
}
}
b'w' => {
for b in b'a'..=b'z' {
self.add_byte(b);
}
for b in b'A'..=b'Z' {
self.add_byte(b);
}
for b in b'0'..=b'9' {
self.add_byte(b);
}
}
b'x' => {
for b in b'0'..=b'9' {
self.add_byte(b);
}
for b in b'a'..=b'f' {
self.add_byte(b);
}
for b in b'A'..=b'F' {
self.add_byte(b);
}
}
_ => {
return Err(Error::Parser(format!(
"invalid byte class '%{:?}'",
class_byte
)));
}
}
Ok(())
}
#[inline(always)]
pub fn contains(&self, b: u8) -> bool {
self.bytes[b as usize]
}
#[inline(always)]
pub fn invert(&mut self) {
for i in 0..256 {
self.bytes[i] = !self.bytes[i];
}
}
}