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Fix a bug in capture with match #561

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Fix a bug in capture with match #561

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7fa0b1c
Fix a bug in capture with match
hikotq Mar 10, 2019
0800bc3
formatting
hikotq Mar 10, 2019
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7 changes: 4 additions & 3 deletions src/backtrack.rs
View file
Original file line number Diff line number Diff line change
@@ -98,6 +98,7 @@ impl<'a, 'm, 'r, 's, I: Input> Bounded<'a, 'm, 'r, 's, I> {
slots: &'s mut [Slot],
input: I,
start: usize,
end: usize,
) -> bool {
let mut cache = cache.borrow_mut();
let cache = &mut cache.backtrack;
@@ -109,7 +110,7 @@ impl<'a, 'm, 'r, 's, I: Input> Bounded<'a, 'm, 'r, 's, I> {
slots: slots,
m: cache,
};
b.exec_(start)
b.exec_(start, end)
}

/// Clears the cache such that the backtracking engine can be executed
@@ -147,7 +148,7 @@ impl<'a, 'm, 'r, 's, I: Input> Bounded<'a, 'm, 'r, 's, I> {

/// Start backtracking at the given position in the input, but also look
/// for literal prefixes.
fn exec_(&mut self, mut at: InputAt) -> bool {
fn exec_(&mut self, mut at: InputAt, end: usize) -> bool {
self.clear();
// If this is an anchored regex at the beginning of the input, then
// we're either already done or we only need to try backtracking once.
@@ -170,7 +171,7 @@ impl<'a, 'm, 'r, 's, I: Input> Bounded<'a, 'm, 'r, 's, I> {
if matched && self.prog.matches.len() == 1 {
return true;
}
if at.is_end() {
if at.pos() == end {
break;
}
at = self.input.at(at.next_pos());
90 changes: 51 additions & 39 deletions src/exec.rs
View file
Original file line number Diff line number Diff line change
@@ -10,7 +10,6 @@

use std::cell::RefCell;
use std::collections::HashMap;
use std::cmp;
use std::sync::Arc;

use thread_local::CachedThreadLocal;
@@ -557,7 +556,8 @@ impl<'c> RegularExpression for ExecNoSync<'c> {
match self.ro.match_type {
MatchType::Literal(ty) => {
self.find_literals(ty, text, start).and_then(|(s, e)| {
self.captures_nfa_with_match(slots, text, s, e)
self.captures_nfa_type(
MatchNfaType::Auto, slots, text, s, e)
})
}
MatchType::Dfa => {
@@ -566,7 +566,8 @@ impl<'c> RegularExpression for ExecNoSync<'c> {
} else {
match self.find_dfa_forward(text, start) {
dfa::Result::Match((s, e)) => {
self.captures_nfa_with_match(slots, text, s, e)
self.captures_nfa_type(
MatchNfaType::Auto, slots, text, s, e)
}
dfa::Result::NoMatch(_) => None,
dfa::Result::Quit => self.captures_nfa(slots, text, start),
@@ -576,7 +577,8 @@ impl<'c> RegularExpression for ExecNoSync<'c> {
MatchType::DfaAnchoredReverse => {
match self.find_dfa_anchored_reverse(text, start) {
dfa::Result::Match((s, e)) => {
self.captures_nfa_with_match(slots, text, s, e)
self.captures_nfa_type(
MatchNfaType::Auto, slots, text, s, e)
}
dfa::Result::NoMatch(_) => None,
dfa::Result::Quit => self.captures_nfa(slots, text, start),
@@ -585,14 +587,15 @@ impl<'c> RegularExpression for ExecNoSync<'c> {
MatchType::DfaSuffix => {
match self.find_dfa_reverse_suffix(text, start) {
dfa::Result::Match((s, e)) => {
self.captures_nfa_with_match(slots, text, s, e)
self.captures_nfa_type(
MatchNfaType::Auto, slots, text, s, e)
}
dfa::Result::NoMatch(_) => None,
dfa::Result::Quit => self.captures_nfa(slots, text, start),
}
}
MatchType::Nfa(ty) => {
self.captures_nfa_type(ty, slots, text, start)
self.captures_nfa_type(ty, slots, text, start, text.len())
}
MatchType::Nothing => None,
MatchType::DfaMany => {
@@ -830,7 +833,7 @@ impl<'c> ExecNoSync<'c> {
text: &[u8],
start: usize,
) -> bool {
self.exec_nfa(ty, &mut [false], &mut [], true, text, start)
self.exec_nfa(ty, &mut [false], &mut [], true, text, start, text.len())
}

/// Finds the shortest match using an NFA.
@@ -846,7 +849,15 @@ impl<'c> ExecNoSync<'c> {
start: usize,
) -> Option<usize> {
let mut slots = [None, None];
if self.exec_nfa(ty, &mut [false], &mut slots, true, text, start) {
if self.exec_nfa(
ty,
&mut [false],
&mut slots,
true,
text,
start,
text.len()
) {
slots[1]
} else {
None
@@ -861,7 +872,15 @@ impl<'c> ExecNoSync<'c> {
start: usize,
) -> Option<(usize, usize)> {
let mut slots = [None, None];
if self.exec_nfa(ty, &mut [false], &mut slots, false, text, start) {
if self.exec_nfa(
ty,
&mut [false],
&mut slots,
false,
text,
start,
text.len()
) {
match (slots[0], slots[1]) {
(Some(s), Some(e)) => Some((s, e)),
_ => None,
@@ -871,26 +890,6 @@ impl<'c> ExecNoSync<'c> {
}
}

/// Like find_nfa, but fills in captures and restricts the search space
/// using previously found match information.
///
/// `slots` should have length equal to `2 * nfa.captures.len()`.
fn captures_nfa_with_match(
&self,
slots: &mut [Slot],
text: &[u8],
match_start: usize,
match_end: usize,
) -> Option<(usize, usize)> {
// We can't use match_end directly, because we may need to examine one
// "character" after the end of a match for lookahead operators. We
// need to move two characters beyond the end, since some look-around
// operations may falsely assume a premature end of text otherwise.
let e = cmp::min(
next_utf8(text, next_utf8(text, match_end)), text.len());
self.captures_nfa(slots, &text[..e], match_start)
}

/// Like find_nfa, but fills in captures.
///
/// `slots` should have length equal to `2 * nfa.captures.len()`.
@@ -900,7 +899,8 @@ impl<'c> ExecNoSync<'c> {
text: &[u8],
start: usize,
) -> Option<(usize, usize)> {
self.captures_nfa_type(MatchNfaType::Auto, slots, text, start)
self.captures_nfa_type(
MatchNfaType::Auto, slots, text, start, text.len())
}

/// Like captures_nfa, but allows specification of type of NFA engine.
@@ -910,8 +910,9 @@ impl<'c> ExecNoSync<'c> {
slots: &mut [Slot],
text: &[u8],
start: usize,
end: usize,
) -> Option<(usize, usize)> {
if self.exec_nfa(ty, &mut [false], slots, false, text, start) {
if self.exec_nfa(ty, &mut [false], slots, false, text, start, end) {
match (slots[0], slots[1]) {
(Some(s), Some(e)) => Some((s, e)),
_ => None,
@@ -929,6 +930,7 @@ impl<'c> ExecNoSync<'c> {
quit_after_match: bool,
text: &[u8],
start: usize,
end: usize,
) -> bool {
use self::MatchNfaType::*;
if let Auto = ty {
@@ -940,10 +942,10 @@ impl<'c> ExecNoSync<'c> {
}
match ty {
Auto => unreachable!(),
Backtrack => self.exec_backtrack(matches, slots, text, start),
Backtrack => self.exec_backtrack(matches, slots, text, start, end),
PikeVM => {
self.exec_pikevm(
matches, slots, quit_after_match, text, start)
matches, slots, quit_after_match, text, start, end)
}
}
}
@@ -956,6 +958,7 @@ impl<'c> ExecNoSync<'c> {
quit_after_match: bool,
text: &[u8],
start: usize,
end: usize,
) -> bool {
if self.ro.nfa.uses_bytes() {
pikevm::Fsm::exec(
@@ -965,7 +968,8 @@ impl<'c> ExecNoSync<'c> {
slots,
quit_after_match,
ByteInput::new(text, self.ro.nfa.only_utf8),
start)
start,
end)
} else {
pikevm::Fsm::exec(
&self.ro.nfa,
@@ -974,7 +978,8 @@ impl<'c> ExecNoSync<'c> {
slots,
quit_after_match,
CharInput::new(text),
start)
start,
end)
}
}

@@ -985,6 +990,7 @@ impl<'c> ExecNoSync<'c> {
slots: &mut [Slot],
text: &[u8],
start: usize,
end: usize,
) -> bool {
if self.ro.nfa.uses_bytes() {
backtrack::Bounded::exec(
@@ -993,15 +999,17 @@ impl<'c> ExecNoSync<'c> {
matches,
slots,
ByteInput::new(text, self.ro.nfa.only_utf8),
start)
start,
end)
} else {
backtrack::Bounded::exec(
&self.ro.nfa,
self.cache,
matches,
slots,
CharInput::new(text),
start)
start,
end)
}
}

@@ -1045,11 +1053,15 @@ impl<'c> ExecNoSync<'c> {
&mut [],
false,
text,
start)
start,
text.len())
}
}
}
Nfa(ty) => self.exec_nfa(ty, matches, &mut [], false, text, start),
Nfa(ty) => {
self.exec_nfa(
ty, matches, &mut [], false, text, start, text.len())
}
Nothing => false,
}
}
5 changes: 4 additions & 1 deletion src/pikevm.rs
View file
Original file line number Diff line number Diff line change
@@ -107,6 +107,7 @@ impl<'r, I: Input> Fsm<'r, I> {
quit_after_match: bool,
input: I,
start: usize,
end: usize,
) -> bool {
let mut cache = cache.borrow_mut();
let cache = &mut cache.pikevm;
@@ -124,6 +125,7 @@ impl<'r, I: Input> Fsm<'r, I> {
slots,
quit_after_match,
at,
end,
)
}

@@ -135,6 +137,7 @@ impl<'r, I: Input> Fsm<'r, I> {
slots: &mut [Slot],
quit_after_match: bool,
mut at: InputAt,
end: usize,
) -> bool {
let mut matched = false;
let mut all_matched = false;
@@ -212,7 +215,7 @@ impl<'r, I: Input> Fsm<'r, I> {
}
}
}
if at.is_end() {
if at.pos() == end {
break;
}
at = at_next;
7 changes: 6 additions & 1 deletion tests/regression.rs
View file
Original file line number Diff line number Diff line change
@@ -88,8 +88,13 @@ ismatch!(reverse_suffix2, r"\d\d\d000", "153.230000\n", true);
matiter!(reverse_suffix3, r"\d\d\d000", "153.230000\n", (4, 10));

// See: https://github.com/rust-lang/regex/issues/334
mat!(captures_after_dfa_premature_end, r"a(b*(X|$))?", "abcbX",
// See: https://github.com/rust-lang/regex/issues/557
mat!(captures_after_dfa_premature_end1, r"a(b*(X|$))?", "abcbX",
Some((0, 1)), None, None);
mat!(captures_after_dfa_premature_end2, r"a(bc*(X|$))?", "abcbX",
Some((0, 1)), None, None);
mat!(captures_after_dfa_premature_end3, r"(aa$)?", "aaz",
Some((0, 0)));

// See: https://github.com/rust-lang/regex/issues/437
ismatch!(