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Code Editor : pcrecallout.html

<html>
<head>
<title>pcrecallout specification</title>
</head>
<body bgcolor="#FFFFFF" text="#00005A" link="#0066FF" alink="#3399FF" vlink="#2222BB">
<h1>pcrecallout man page</h1>

Return to the <a href="index.html">PCRE index page</a>.


This page is part of the PCRE HTML documentation. It was generated automatically
from the original man page. If there is any nonsense in it, please consult the
man page, in case the conversion went wrong.
 
<ul>
<li><a name="TOC1" href="#SEC1">SYNOPSIS</a>
<li><a name="TOC2" href="#SEC2">DESCRIPTION</a>
<li><a name="TOC3" href="#SEC3">MISSING CALLOUTS</a>
<li><a name="TOC4" href="#SEC4">THE CALLOUT INTERFACE</a>
<li><a name="TOC5" href="#SEC5">RETURN VALUES</a>
<li><a name="TOC6" href="#SEC6">AUTHOR</a>
<li><a name="TOC7" href="#SEC7">REVISION</a>
</ul>
 <a name="SEC1" href="#TOC1">SYNOPSIS</a> 

#include &#60;pcre.h&#62;


int (*pcre_callout)(pcre_callout_block *);


int (*pcre16_callout)(pcre16_callout_block *);


int (*pcre32_callout)(pcre32_callout_block *);

 <a name="SEC2" href="#TOC1">DESCRIPTION</a> 

PCRE provides a feature called "callout", which is a means of temporarily
passing control to the caller of PCRE in the middle of pattern matching. The
caller of PCRE provides an external function by putting its entry point in the
global variable pcre_callout (pcre16_callout for the 16-bit
library, pcre32_callout for the 32-bit library). By default, this
variable contains NULL, which disables all calling out.


Within a regular expression, (?C) indicates the points at which the external
function is to be called. Different callout points can be identified by putting
a number less than 256 after the letter C. The default value is zero.
For example, this pattern has two callout points:
<pre>
 (?C1)abc(?C2)def
</pre>
If the PCRE_AUTO_CALLOUT option bit is set when a pattern is compiled, PCRE
automatically inserts callouts, all with number 255, before each item in the
pattern. For example, if PCRE_AUTO_CALLOUT is used with the pattern
<pre>
 A(\d{2}|--)
</pre>
it is processed as if it were
 
 
(?C255)A(?C255)((?C255)\d{2}(?C255)|(?C255)-(?C255)-(?C255))(?C255)
 
 
Notice that there is a callout before and after each parenthesis and
alternation bar. Automatic callouts can be used for tracking the progress of
pattern matching. The
<a href="pcretest.html">pcretest</a>
command has an option that sets automatic callouts; when it is used, the output
indicates how the pattern is matched. This is useful information when you are
trying to optimize the performance of a particular pattern.


The use of callouts in a pattern makes it ineligible for optimization by the
just-in-time compiler. Studying such a pattern with the PCRE_STUDY_JIT_COMPILE
option always fails.

 <a name="SEC3" href="#TOC1">MISSING CALLOUTS</a> 

You should be aware that, because of optimizations in the way PCRE matches
patterns by default, callouts sometimes do not happen. For example, if the
pattern is
<pre>
 ab(?C4)cd
</pre>
PCRE knows that any matching string must contain the letter "d". If the subject
string is "abyz", the lack of "d" means that matching doesn't ever start, and
the callout is never reached. However, with "abyd", though the result is still
no match, the callout is obeyed.


If the pattern is studied, PCRE knows the minimum length of a matching string,
and will immediately give a "no match" return without actually running a match
if the subject is not long enough, or, for unanchored patterns, if it has
been scanned far enough.


You can disable these optimizations by passing the PCRE_NO_START_OPTIMIZE
option to the matching function, or by starting the pattern with
(*NO_START_OPT). This slows down the matching process, but does ensure that
callouts such as the example above are obeyed.

 <a name="SEC4" href="#TOC1">THE CALLOUT INTERFACE</a> 

During matching, when PCRE reaches a callout point, the external function
defined by pcre_callout or pcre[16|32]_callout is called
(if it is set). This applies to both normal and DFA matching. The only
argument to the callout function is a pointer to a pcre_callout
or pcre[16|32]_callout block.
These structures contains the following fields:
<pre>
 int version;
 int callout_number;
 int *offset_vector;
 const char *subject; (8-bit version)
 PCRE_SPTR16 subject; (16-bit version)
 PCRE_SPTR32 subject; (32-bit version)
 int subject_length;
 int start_match;
 int current_position;
 int capture_top;
 int capture_last;
 void *callout_data;
 int pattern_position;
 int next_item_length;
 const unsigned char *mark; (8-bit version)
 const PCRE_UCHAR16 *mark; (16-bit version)
 const PCRE_UCHAR32 *mark; (32-bit version)
</pre>
The version field is an integer containing the version number of the
block format. The initial version was 0; the current version is 2. The version
number will change again in future if additional fields are added, but the
intention is never to remove any of the existing fields.


The callout_number field contains the number of the callout, as compiled
into the pattern (that is, the number after ?C for manual callouts, and 255 for
automatically generated callouts).


The offset_vector field is a pointer to the vector of offsets that was
passed by the caller to the matching function. When pcre_exec() or
pcre[16|32]_exec() is used, the contents can be inspected, in order to extract
substrings that have been matched so far, in the same way as for extracting
substrings after a match has completed. For the DFA matching functions, this
field is not useful.


The subject and subject_length fields contain copies of the values
that were passed to the matching function.


The start_match field normally contains the offset within the subject at
which the current match attempt started. However, if the escape sequence \K
has been encountered, this value is changed to reflect the modified starting
point. If the pattern is not anchored, the callout function may be called
several times from the same point in the pattern for different starting points
in the subject.


The current_position field contains the offset within the subject of the
current match pointer.


When the pcre_exec() or pcre[16|32]_exec() is used, the
capture_top field contains one more than the number of the highest
numbered captured substring so far. If no substrings have been captured, the
value of capture_top is one. This is always the case when the DFA
functions are used, because they do not support captured substrings.


The capture_last field contains the number of the most recently captured
substring. If no substrings have been captured, its value is -1. This is always
the case for the DFA matching functions.


The callout_data field contains a value that is passed to a matching
function specifically so that it can be passed back in callouts. It is passed
in the callout_data field of a pcre_extra or pcre[16|32]_extra
data structure. If no such data was passed, the value of callout_data in
a callout block is NULL. There is a description of the pcre_extra
structure in the
<a href="pcreapi.html">pcreapi</a>
documentation.


The pattern_position field is present from version 1 of the callout
structure. It contains the offset to the next item to be matched in the pattern
string.


The next_item_length field is present from version 1 of the callout
structure. It contains the length of the next item to be matched in the pattern
string. When the callout immediately precedes an alternation bar, a closing
parenthesis, or the end of the pattern, the length is zero. When the callout
precedes an opening parenthesis, the length is that of the entire subpattern.


The pattern_position and next_item_length fields are intended to
help in distinguishing between different automatic callouts, which all have the
same callout number. However, they are set for all callouts.


The mark field is present from version 2 of the callout structure. In
callouts from pcre_exec() or pcre[16|32]_exec() it contains a pointer to
the zero-terminated name of the most recently passed (*MARK), (*PRUNE), or
(*THEN) item in the match, or NULL if no such items have been passed. Instances
of (*PRUNE) or (*THEN) without a name do not obliterate a previous (*MARK). In
callouts from the DFA matching functions this field always contains NULL.

 <a name="SEC5" href="#TOC1">RETURN VALUES</a> 

The external callout function returns an integer to PCRE. If the value is zero,
matching proceeds as normal. If the value is greater than zero, matching fails
at the current point, but the testing of other matching possibilities goes
ahead, just as if a lookahead assertion had failed. If the value is less than
zero, the match is abandoned, the matching function returns the negative value.


Negative values should normally be chosen from the set of PCRE_ERROR_xxx
values. In particular, PCRE_ERROR_NOMATCH forces a standard "no match" failure.
The error number PCRE_ERROR_CALLOUT is reserved for use by callout functions;
it will never be used by PCRE itself.

 <a name="SEC6" href="#TOC1">AUTHOR</a> 

Philip Hazel
 
University Computing Service
 
Cambridge CB2 3QH, England.
 

 <a name="SEC7" href="#TOC1">REVISION</a> 

Last updated: 24 June 2012
 
Copyright &copy; 1997-2012 University of Cambridge.
 

Return to the <a href="index.html">PCRE index page</a>.

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Code Editor : pcrecallout.html