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From a824afe95b6272148dce1f8bf4bcd20a667412e6 Mon Sep 17 00:00:00 2001
From: Karl Williamson <khw@cpan.org>
Date: Sun, 30 Sep 2018 10:38:02 -0600
Subject: [PATCH] PATCH: [perl #133547]: script run broken
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
All scripts can have the ASCII digits for their numbers. Scripts with
their own digits can alternatively use those. Only one of these two
sets can be used in a script run. The decision as to which set to use
must be deferred until the first digit is encountered, as otherwise we
don't know which set will be used. Prior to this commit, the decision
was being made prematurely in some cases. As a result of this change,
the non-ASCII-digits in the Common script need to be special-cased, and
different criteria are used to decide if we need to look up whether a
character is a digit or not.
Petr Písař: Ported to 5.28.1 from
393e5a4585b92e635cfc4eee34da8f86f3bfd2af.
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
regexec.c | 111 +++++++++++++++++++++++-----------------------
t/re/script_run.t | 5 +++
2 files changed, 61 insertions(+), 55 deletions(-)
diff --git a/regexec.c b/regexec.c
index 899d979..201d9aa 100644
--- a/regexec.c
+++ b/regexec.c
@@ -10323,6 +10323,10 @@ Perl_isSCRIPT_RUN(pTHX_ const U8 * s, const U8 * send, const bool utf8_target)
/* Look at each character in the sequence */
while (s < send) {
+ /* If the current character being examined is a digit, this is the code
+ * point of the zero for its sequence of 10 */
+ UV zero_of_char;
+
UV cp;
/* The code allows all scripts to use the ASCII digits. This is
@@ -10434,16 +10438,6 @@ Perl_isSCRIPT_RUN(pTHX_ const U8 * s, const U8 * send, const bool utf8_target)
script_of_run = script_of_char;
}
- /* All decimal digits must be from the same sequence of 10. Above, we
- * handled any ASCII digits without descending to here. We also
- * handled the case where we already knew what digit sequence is the
- * one to use, and the character is in that sequence. Now that we know
- * the script, we can use script_zeros[] to directly find which
- * sequence the script uses, except in a few cases it returns 0 */
- if (UNLIKELY(zero_of_run == 0) && script_of_char >= 0) {
- zero_of_run = script_zeros[script_of_char];
- }
-
/* Now we can see if the script of the character is the same as that of
* the run */
if (LIKELY(script_of_char == script_of_run)) {
@@ -10601,55 +10595,62 @@ Perl_isSCRIPT_RUN(pTHX_ const U8 * s, const U8 * send, const bool utf8_target)
/* Here, the script of the character is compatible with that of the
* run. That means that in most cases, it continues the script run.
* Either it and the run match exactly, or one or both can be in any of
- * several scripts, and the intersection is not empty. But if the
- * character is a decimal digit, we need further handling. If we
- * haven't seen a digit before, it would establish what set of 10 all
- * must come from; and if we have established a set, we need to check
- * that this is in it.
- *
- * But there are cases we can rule out without having to look up if
- * this is a digit:
- * a. All instances of [0-9] have been dealt with earlier.
- * b. The next digit encoded by Unicode is 1600 code points further
- * on, so if the code point in this loop iteration is less than
- * that, it isn't a digit.
- * c. Most scripts that have digits have a single set of 10. If
- * we've encountered a digit in such a script, 'zero_of_run' is
- * set to the code point (call it z) whose numeric value is 0.
- * If the code point in this loop iteration is in the range
- * z..z+9, it is in the script's set of 10, and we've actually
- * handled it earlier in this function and won't reach this
- * point. But, code points in that script that aren't in that
- * range can't be digits, so we don't have to look any such up.
- * We can tell if this script is such a one by looking at
- * 'script_zeros[]' for it. It is non-zero iff it has a single
- * set of digits. This rule doesn't apply if we haven't narrowed
- * down the possible scripts to a single one yet. Nor if the
- * zero of the run is '0', as that also hasn't narrowed things
- * down completely */
- if ( cp >= FIRST_NON_ASCII_DECIMAL_DIGIT
- && ( intersection
- || script_of_char < 0 /* Also implies an intersection */
- || zero_of_run == '0'
- || script_zeros[script_of_char] == 0))
+ * several scripts, and the intersection is not empty. However, if the
+ * character is a decimal digit, it could still mean failure if it is
+ * from the wrong sequence of 10. So, we need to look at if it's a
+ * digit. We've already handled the 10 decimal digits, and the next
+ * lowest one is this one: */
+ if (cp < FIRST_NON_ASCII_DECIMAL_DIGIT) {
+ continue; /* Not a digit; this character is part of the run */
+ }
+
+ /* If we have a definitive '0' for the script of this character, we
+ * know that for this to be a digit, it must be in the range of +0..+9
+ * of that zero. */
+ if ( script_of_char >= 0
+ && (zero_of_char = script_zeros[script_of_char]))
{
- SSize_t zero_of_char_index;
- zero_of_char_index = _invlist_search(decimals_invlist, cp);
- if ( LIKELY(zero_of_char_index >= 0)
- && ELEMENT_RANGE_MATCHES_INVLIST(zero_of_char_index))
+ if ( cp < zero_of_char
+ || cp > zero_of_char + 9)
{
- UV zero_of_char = decimals_array[zero_of_char_index];
- if (zero_of_run) {
- if (zero_of_run != zero_of_char) {
- retval = FALSE;
- break;
- }
- }
- else {
- zero_of_run = zero_of_char;
- }
+ continue; /* Not a digit; this character is part of the run
+ */
+ }
+
+ }
+ else { /* Need to look up if this character is a digit or not */
+ SSize_t index_of_zero_of_char;
+ index_of_zero_of_char = _invlist_search(decimals_invlist, cp);
+ if ( UNLIKELY(index_of_zero_of_char < 0)
+ || ! ELEMENT_RANGE_MATCHES_INVLIST(index_of_zero_of_char))
+ {
+ continue; /* Not a digit; this character is part of the run.
+ */
+ }
+
+ zero_of_char = decimals_array[index_of_zero_of_char];
+ }
+
+ /* Here, the character is a decimal digit, and the zero of its sequence
+ * of 10 is in 'zero_of_char'. If we already have a zero for this run,
+ * they better be the same. */
+ if (zero_of_run) {
+ if (zero_of_run != zero_of_char) {
+ retval = FALSE;
+ break;
}
}
+ else if (script_of_char == SCX_Common && script_of_run != SCX_Common) {
+
+ /* Here, the script run isn't Common, but the current digit is in
+ * Common, and isn't '0'-'9' (those were handled earlier). Only
+ * '0'-'9' are acceptable in non-Common scripts. */
+ retval = FALSE;
+ break;
+ }
+ else { /* Otherwise we now have a zero for this run */
+ zero_of_run = zero_of_char;
+ }
} /* end of looping through CLOSESR text */
Safefree(intersection);
diff --git a/t/re/script_run.t b/t/re/script_run.t
index 10c7103..f8809e3 100644
--- a/t/re/script_run.t
+++ b/t/re/script_run.t
@@ -97,4 +97,9 @@ foreach my $type ('script_run', 'sr', 'atomic_script_run', 'asr') {
like("abc", qr/(*asr:a[bc]*c)/, "Outer asr works on a run");
unlike("abc", qr/(*asr:a(*asr:[bc]*)c)/, "Nested asr works to exclude some things");
+ like("\x{0980}12\x{0993}", qr/^(*sr:.{4})/,
+ "Script with own zero works with ASCII digits"); # perl #133547
+ like("\x{3041}12\x{3041}", qr/^(*sr:.{4})/,
+ "Script without own zero works with ASCII digits");
+
done_testing();
--
2.17.2
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