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https://github.com/tursodatabase/libsql.git
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d3a156caf5
A common complain with libSQL is how to run extensions. The main mechanism, with a .so, has a lot of issues around how those .so are distributed. The most common extensions are the ones in the sqlean package. We can improve this experience by bundling them in our sqlite build. Not all SQLean extensions are kosher: some of them, like fileio, use the vfs. Others, are deemed too complex. The extensions included here are a subset that we deem important enough, and low risk enough, to just be a part of the main bundle.
244 lines
6.2 KiB
C
244 lines
6.2 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Original API code Copyright (c) 1997-2012 University of Cambridge
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New API code Copyright (c) 2016 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This module contains internal functions for testing newlines when more than
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one kind of newline is to be recognized. When a newline is found, its length is
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returned. In principle, we could implement several newline "types", each
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referring to a different set of newline characters. At present, PCRE2 supports
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only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
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and NLTYPE_ANY. The full list of Unicode newline characters is taken from
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http://unicode.org/unicode/reports/tr18/. */
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#ifdef HAVE_CONFIG_H
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#include "regexp/pcre2/config.h"
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#endif
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#include "regexp/pcre2/pcre2_internal.h"
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/*************************************************
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* Check for newline at given position *
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*************************************************/
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/* This function is called only via the IS_NEWLINE macro, which does so only
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when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed
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newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the code unit
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pointed to by ptr is less than the end of the string.
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Arguments:
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ptr pointer to possible newline
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type the newline type
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endptr pointer to the end of the string
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lenptr where to return the length
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utf TRUE if in utf mode
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Returns: TRUE or FALSE
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*/
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BOOL
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PRIV(is_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR endptr,
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uint32_t *lenptr, BOOL utf)
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{
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uint32_t c;
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#ifdef SUPPORT_UNICODE
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if (utf) { GETCHAR(c, ptr); } else c = *ptr;
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#else
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(void)utf;
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c = *ptr;
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#endif /* SUPPORT_UNICODE */
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if (type == NLTYPE_ANYCRLF) switch(c)
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{
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case CHAR_LF:
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*lenptr = 1;
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return TRUE;
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case CHAR_CR:
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*lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
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return TRUE;
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default:
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return FALSE;
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}
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/* NLTYPE_ANY */
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else switch(c)
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{
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#ifdef EBCDIC
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case CHAR_NEL:
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#endif
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case CHAR_LF:
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case CHAR_VT:
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case CHAR_FF:
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*lenptr = 1;
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return TRUE;
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case CHAR_CR:
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*lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
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return TRUE;
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#ifndef EBCDIC
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#if PCRE2_CODE_UNIT_WIDTH == 8
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case CHAR_NEL:
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*lenptr = utf? 2 : 1;
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return TRUE;
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case 0x2028: /* LS */
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case 0x2029: /* PS */
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*lenptr = 3;
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return TRUE;
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#else /* 16-bit or 32-bit code units */
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case CHAR_NEL:
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case 0x2028: /* LS */
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case 0x2029: /* PS */
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*lenptr = 1;
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return TRUE;
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#endif
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#endif /* Not EBCDIC */
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default:
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return FALSE;
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}
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}
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/*************************************************
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* Check for newline at previous position *
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*************************************************/
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/* This function is called only via the WAS_NEWLINE macro, which does so only
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when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed
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newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the initial
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value of ptr is greater than the start of the string that is being processed.
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Arguments:
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ptr pointer to possible newline
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type the newline type
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startptr pointer to the start of the string
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lenptr where to return the length
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utf TRUE if in utf mode
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Returns: TRUE or FALSE
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*/
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BOOL
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PRIV(was_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR startptr,
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uint32_t *lenptr, BOOL utf)
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{
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uint32_t c;
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ptr--;
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#ifdef SUPPORT_UNICODE
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if (utf)
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{
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BACKCHAR(ptr);
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GETCHAR(c, ptr);
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}
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else c = *ptr;
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#else
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(void)utf;
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c = *ptr;
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#endif /* SUPPORT_UNICODE */
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if (type == NLTYPE_ANYCRLF) switch(c)
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{
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case CHAR_LF:
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*lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
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return TRUE;
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case CHAR_CR:
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*lenptr = 1;
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return TRUE;
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default:
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return FALSE;
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}
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/* NLTYPE_ANY */
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else switch(c)
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{
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case CHAR_LF:
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*lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
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return TRUE;
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#ifdef EBCDIC
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case CHAR_NEL:
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#endif
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case CHAR_VT:
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case CHAR_FF:
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case CHAR_CR:
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*lenptr = 1;
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return TRUE;
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#ifndef EBCDIC
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#if PCRE2_CODE_UNIT_WIDTH == 8
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case CHAR_NEL:
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*lenptr = utf? 2 : 1;
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return TRUE;
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case 0x2028: /* LS */
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case 0x2029: /* PS */
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*lenptr = 3;
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return TRUE;
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#else /* 16-bit or 32-bit code units */
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case CHAR_NEL:
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case 0x2028: /* LS */
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case 0x2029: /* PS */
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*lenptr = 1;
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return TRUE;
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#endif
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#endif /* Not EBCDIC */
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default:
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return FALSE;
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}
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}
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/* End of pcre2_newline.c */
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