Implement PCRE2_INFO_HASBACKSLASHC.

ChangeLog

@@ -307,6 +307,8 @@ as for link size 2.
 91. Document that JIT has a limit on pattern size, and give more information 
 about JIT compile failures in pcre2test.
 
+92. Implement PCRE2_INFO_HASBACKSLASHC.
+
 
 Version 10.20 30-June-2015
 --------------------------

doc/pcre2api.3

@@ -1,4 +1,4 @@
-.TH PCRE2API 3 "13 November 2015" "PCRE2 10.21"
+.TH PCRE2API 3 "14 November 2015" "PCRE2 10.21"
 .SH NAME
 PCRE2 - Perl-compatible regular expressions (revised API)
 .sp
@@ -1643,6 +1643,11 @@ greater than 255 are supported, the flag bit for 255 means "any code unit of
 value 255 or above". If such a table was constructed, a pointer to it is
 returned. Otherwise NULL is returned. The third argument should point to an
 \fBconst uint8_t *\fP variable.
+.sp
+  PCRE2_INFO_HASBACKSLASHC
+.sp
+Return 1 if the pattern contains any instances of \eC, otherwise 0. The third
+argument should point to an \fBuint32_t\fP variable.
 .sp
   PCRE2_INFO_HASCRORLF
 .sp
@@ -3092,6 +3097,6 @@ Cambridge, England.
 .rs
 .sp
 .nf
-Last updated: 13 November 2015
+Last updated: 14 November 2015
 Copyright (c) 1997-2015 University of Cambridge.
 .fi

src/pcre2.h

@@ -268,6 +268,7 @@ numbers must not be changed. */
 #define PCRE2_INFO_NEWLINE              20
 #define PCRE2_INFO_RECURSIONLIMIT       21
 #define PCRE2_INFO_SIZE                 22
+#define PCRE2_INFO_HASBACKSLASHC        23
 
 /* Request types for pcre2_config(). */
 

src/pcre2.h.in

@@ -268,6 +268,7 @@ numbers must not be changed. */
 #define PCRE2_INFO_NEWLINE              20
 #define PCRE2_INFO_RECURSIONLIMIT       21
 #define PCRE2_INFO_SIZE                 22
+#define PCRE2_INFO_HASBACKSLASHC        23
 
 /* Request types for pcre2_config(). */
 

src/pcre2_compile.c

@@ -7287,6 +7287,7 @@ for (;; ptr++)
 
       else
         {
+        if (escape == ESC_C) cb->external_flags |= PCRE2_HASBKC; /* Record */ 
         if ((escape == ESC_b || escape == ESC_B || escape == ESC_A) &&
              cb->max_lookbehind == 0)
           cb->max_lookbehind = 1;

src/pcre2_internal.h

@@ -531,6 +531,7 @@ bytes in a code unit in that mode. */
 #define PCRE2_NOJIT         0x00080000  /* (*NOJIT) used */
 #define PCRE2_HASBKPORX     0x00100000  /* contains \P, \p, or \X */
 #define PCRE2_DUPCAPUSED    0x00200000  /* contains (?| */
+#define PCRE2_HASBKC        0x00400000  /* contains \C */
 
 #define PCRE2_MODE_MASK     (PCRE2_MODE8 | PCRE2_MODE16 | PCRE2_MODE32)
 

src/pcre2_pattern_info.c

@@ -7,7 +7,7 @@ and semantics are as close as possible to those of the Perl 5 language.
 
                        Written by Philip Hazel
      Original API code Copyright (c) 1997-2012 University of Cambridge
-         New API code Copyright (c) 2014 University of Cambridge
+         New API code Copyright (c) 2015 University of Cambridge
 
 -----------------------------------------------------------------------------
 Redistribution and use in source and binary forms, with or without
@@ -77,6 +77,7 @@ if (where == NULL)   /* Requests field length */
     case PCRE2_INFO_CAPTURECOUNT:
     case PCRE2_INFO_FIRSTCODETYPE:
     case PCRE2_INFO_FIRSTCODEUNIT:
+    case PCRE2_INFO_HASBACKSLASHC: 
     case PCRE2_INFO_HASCRORLF:
     case PCRE2_INFO_JCHANGED:
     case PCRE2_INFO_LASTCODETYPE:
@@ -151,6 +152,10 @@ switch(what)
     &(re->start_bitmap[0]) : NULL;
   break;
 
+  case PCRE2_INFO_HASBACKSLASHC:
+  *((uint32_t *)where) = (re->flags & PCRE2_HASBKC) != 0;
+  break;
+
   case PCRE2_INFO_HASCRORLF:
   *((uint32_t *)where) = (re->flags & PCRE2_HASCRORLF) != 0;
   break;

src/pcre2test.c

@@ -3745,8 +3745,9 @@ if ((pat_patctl.control & CTL_INFO) != 0)
   const uint8_t *start_bits;
   BOOL match_limit_set, recursion_limit_set;
   uint32_t backrefmax, bsr_convention, capture_count, first_ctype, first_cunit,
-    hascrorlf, jchanged, last_ctype, last_cunit, match_empty, match_limit,
-    minlength, nameentrysize, namecount, newline_convention, recursion_limit;
+    hasbackslashc, hascrorlf, jchanged, last_ctype, last_cunit, match_empty, 
+    match_limit, minlength, nameentrysize, namecount, newline_convention, 
+    recursion_limit;
 
   /* These info requests may return PCRE2_ERROR_UNSET. */
 
@@ -3786,6 +3787,7 @@ if ((pat_patctl.control & CTL_INFO) != 0)
       pattern_info(PCRE2_INFO_FIRSTBITMAP, &start_bits, FALSE) +
       pattern_info(PCRE2_INFO_FIRSTCODEUNIT, &first_cunit, FALSE) +
       pattern_info(PCRE2_INFO_FIRSTCODETYPE, &first_ctype, FALSE) +
+      pattern_info(PCRE2_INFO_HASBACKSLASHC, &hasbackslashc, FALSE) +
       pattern_info(PCRE2_INFO_HASCRORLF, &hascrorlf, FALSE) +
       pattern_info(PCRE2_INFO_JCHANGED, &jchanged, FALSE) +
       pattern_info(PCRE2_INFO_LASTCODEUNIT, &last_cunit, FALSE) +
@@ -3841,6 +3843,7 @@ if ((pat_patctl.control & CTL_INFO) != 0)
     }
 
   if (hascrorlf)     fprintf(outfile, "Contains explicit CR or LF match\n");
+  if (hasbackslashc) fprintf(outfile, "Contains \\C\n");
   if (match_empty)   fprintf(outfile, "May match empty string\n");
 
   pattern_info(PCRE2_INFO_ARGOPTIONS, &compile_options, FALSE);

testdata/testinput2

@@ -11,6 +11,8 @@
 #forbid_utf
 #newline_default lf any anycrlf
 
+/abc\Cdef/info
+
 # Test binary zeroes in the pattern
 
 # /a\0B/ where 0 is a binary zero

testdata/testinput5

@@ -1689,4 +1689,6 @@
 /abc/utf,replace=xyz
     abc\=zero_terminate
 
+/abc\Cdef/info,utf
+
 # End of testinput5 

testdata/testoutput2

@@ -11,6 +11,13 @@
 #forbid_utf
 #newline_default lf any anycrlf
 
+/abc\Cdef/info
+Capturing subpattern count = 0
+Contains \C
+First code unit = 'a'
+Last code unit = 'f'
+Subject length lower bound = 7
+
 # Test binary zeroes in the pattern
 
 # /a\0B/ where 0 is a binary zero

testdata/testoutput5

@@ -4062,4 +4062,12 @@ No match
     abc\=zero_terminate
  1: xyz
 
+/abc\Cdef/info,utf
+Capturing subpattern count = 0
+Contains \C
+Options: utf
+First code unit = 'a'
+Last code unit = 'f'
+Subject length lower bound = 0
+
 # End of testinput5