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/*
* SPDX-FileCopyrightText: 2020 Stalwart Labs Ltd <hello@stalw.art>
*
* SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
*/
use std::char::REPLACEMENT_CHARACTER;
use crate::MAX_MATCH_VARIABLES;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct GlobPattern {
pattern: Vec<PatternChar>,
to_lower: bool,
}
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum PatternChar {
WildcardMany { num: usize, match_pos: usize },
WildcardSingle { match_pos: usize },
Char { char: char, match_pos: usize },
}
impl GlobPattern {
pub fn compile(pattern: &str, to_lower: bool) -> Self {
let mut chars = Vec::new();
let mut is_escaped = false;
let mut str = pattern.chars().peekable();
while let Some(char) = str.next() {
match char {
'*' if !is_escaped => {
let mut num = 1;
while let Some('*') = str.peek() {
num += 1;
str.next();
}
chars.push(PatternChar::WildcardMany { num, match_pos: 0 });
}
'?' if !is_escaped => {
chars.push(PatternChar::WildcardSingle { match_pos: 0 });
}
'\\' if !is_escaped => {
is_escaped = true;
continue;
}
_ => {
if is_escaped {
is_escaped = false;
}
if to_lower && char.is_uppercase() {
for char in char.to_lowercase() {
chars.push(PatternChar::Char { char, match_pos: 0 });
}
} else {
chars.push(PatternChar::Char { char, match_pos: 0 });
}
}
}
}
GlobPattern {
pattern: chars,
to_lower,
}
}
// Credits: Algorithm ported from https://research.swtch.com/glob
pub fn matches(&self, value: &str) -> bool {
let value = if self.to_lower {
value.to_lowercase().chars().collect::<Vec<_>>()
} else {
value.chars().collect::<Vec<_>>()
};
let mut px = 0;
let mut nx = 0;
let mut next_px = 0;
let mut next_nx = 0;
while px < self.pattern.len() || nx < value.len() {
match self.pattern.get(px) {
Some(PatternChar::Char { char, .. }) => {
if matches!(value.get(nx), Some(nc) if nc == char ) {
px += 1;
nx += 1;
continue;
}
}
Some(PatternChar::WildcardSingle { .. }) => {
if nx < value.len() {
px += 1;
nx += 1;
continue;
}
}
Some(PatternChar::WildcardMany { .. }) => {
next_px = px;
next_nx = nx + 1;
px += 1;
continue;
}
_ => (),
}
if 0 < next_nx && next_nx <= value.len() {
px = next_px;
nx = next_nx;
continue;
}
return false;
}
true
}
pub fn capture(
mut self,
value_: &str,
capture_positions: u64,
captured_values: &mut Vec<(usize, String)>,
) -> bool {
let value = if self.to_lower {
let mut value = Vec::with_capacity(value_.len());
for char in value_.chars() {
if char.is_uppercase() {
for (pos, lowerchar) in char.to_lowercase().enumerate() {
value.push((
lowerchar,
if pos == 0 {
char
} else {
REPLACEMENT_CHARACTER
},
));
}
} else {
value.push((char, char));
}
}
value
} else {
value_.chars().map(|char| (char, char)).collect::<Vec<_>>()
};
let mut px = 0;
let mut nx = 0;
let mut next_px = 0;
let mut next_nx = 0;
while px < self.pattern.len() || nx < value.len() {
match self.pattern.get_mut(px) {
Some(PatternChar::Char { char, match_pos }) => {
if matches!(value.get(nx), Some(nc) if &nc.0 == char ) {
*match_pos = nx;
px += 1;
nx += 1;
continue;
}
}
Some(PatternChar::WildcardSingle { match_pos }) => {
if nx < value.len() {
*match_pos = nx;
px += 1;
nx += 1;
continue;
}
}
Some(PatternChar::WildcardMany { match_pos, .. }) => {
*match_pos = nx;
next_px = px;
next_nx = nx + 1;
px += 1;
continue;
}
_ => (),
}
if 0 < next_nx && next_nx <= value.len() {
px = next_px;
nx = next_nx;
continue;
}
return false;
}
let mut last_pos = 0;
captured_values.clear();
if capture_positions & 1 != 0 {
captured_values.push((0usize, value_.to_string()));
}
let mut wildcard_pos: usize = 1;
for item in &self.pattern {
if wildcard_pos <= MAX_MATCH_VARIABLES as usize {
last_pos = match item {
PatternChar::WildcardMany { mut num, match_pos } => {
while num > 1 {
if capture_positions & (1 << wildcard_pos) != 0 {
captured_values.push((wildcard_pos, String::with_capacity(0)));
}
wildcard_pos += 1;
num -= 1;
}
if capture_positions & (1 << wildcard_pos) != 0 {
if let Some(range) = value.get(last_pos..*match_pos) {
captured_values.push((
wildcard_pos,
range
.iter()
.filter_map(|(_, char)| {
if char != &REPLACEMENT_CHARACTER {
Some(char)
} else {
None
}
})
.collect::<String>(),
));
} else {
debug_assert!(false, "Glob pattern failure.");
return false;
}
}
wildcard_pos += 1;
match_pos
}
PatternChar::WildcardSingle { match_pos } => {
if capture_positions & (1 << wildcard_pos) != 0 {
if let Some((char, orig_char)) = value.get(*match_pos) {
captured_values.push((
wildcard_pos,
(if orig_char != &REPLACEMENT_CHARACTER {
orig_char
} else {
char
})
.to_string(),
));
} else {
debug_assert!(false, "Glob pattern failure.");
return false;
}
}
wildcard_pos += 1;
match_pos
}
PatternChar::Char { match_pos, .. } => match_pos,
} + 1;
} else {
break;
}
}
true
}
}
#[cfg(test)]
mod tests {
use crate::runtime::tests::glob::GlobPattern;
#[test]
fn glob_match() {
for (value, pattern, expected_result) in [
(
"frop.......frop.........frop....",
"?*frop*",
vec!["f", "rop.......", ".........frop...."],
),
("frop:frup:frop", "*:*:*", vec!["frop", "frup", "frop"]),
(
"a b c d e f g",
"? ? ? ? ? ? ?",
vec!["a", "b", "c", "d", "e", "f", "g"],
),
("puk pok puk pok", "pu*ok", vec!["k pok puk p"]),
("snot kip snot", "snot*snot", vec![" kip "]),
(
"klopfropstroptop",
"*fr??*top",
vec!["klop", "o", "p", "strop"],
),
("toptoptop", "*top", vec!["toptop"]),
(
"Fehlende Straße zur Karte hinzufügen",
"FEHLENDE * ZUR Karte HINZUFÜGEN",
vec!["Straße"],
),
] {
let p = GlobPattern::compile(pattern, true);
let mut match_values = Vec::new();
assert!(
p.clone().capture(value, u64::MAX ^ 1, &mut match_values),
"{value:?} {pattern:?}",
);
assert_eq!(
match_values.into_iter().map(|(_, v)| v).collect::<Vec<_>>(),
expected_result,
"{value:?} {pattern:?}",
);
assert!(p.matches(value), "{value:?} {pattern:?}",);
}
}
}