Tests and documentation updates.
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Philip.Hazel
parent
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doc/pcre2.3
21
doc/pcre2.3
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@ -1,4 +1,4 @@
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.TH PCRE2 3 "03 November 2014" "PCRE2 10.00"
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.TH PCRE2 3 "18 November 2014" "PCRE2 10.00"
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.SH NAME
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PCRE2 - Perl-compatible regular expressions (revised API)
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.SH INTRODUCTION
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@ -8,9 +8,10 @@ PCRE2 is the name used for a revised API for the PCRE library, which is a set
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of functions, written in C, that implement regular expression pattern matching
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using the same syntax and semantics as Perl, with just a few differences. Some
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features that appeared in Python and the original PCRE before they appeared in
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Perl are also available using the Python syntax, there is some support for one
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or two .NET and Oniguruma syntax items, and there are options for requesting
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some minor changes that give better ECMAScript (aka JavaScript) compatibility.
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Perl are also available using the Python syntax. There is also some support for
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one or two .NET and Oniguruma syntax items, and there are options for
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requesting some minor changes that give better ECMAScript (aka JavaScript)
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compatibility.
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.P
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The source code for PCRE2 can be compiled to support 8-bit, 16-bit, or 32-bit
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code units, which means that up to three separate libraries may be installed.
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@ -18,7 +19,7 @@ The original work to extend PCRE to 16-bit and 32-bit code units was done by
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Zoltan Herczeg and Christian Persch, respectively. In all three cases, strings
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can be interpreted either as one character per code unit, or as UTF-encoded
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Unicode, with support for Unicode general category properties. Unicode support
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is optional at build time (but is the default); however, processing strings as
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is optional at build time (but is the default). However, processing strings as
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UTF code units must be enabled explicitly at run time. The version of Unicode
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in use can be discovered by running
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.sp
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@ -140,19 +141,19 @@ listing), and the short pages for individual functions, are concatenated in
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pcre2compat discussion of Perl compatibility
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pcre2demo a demonstration C program that uses PCRE2
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pcre2grep description of the \fBpcre2grep\fP command (8-bit only)
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pcre2jit discussion of the just-in-time optimization support
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pcre2jit discussion of just-in-time optimization support
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pcre2limits details of size and other limits
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pcre2matching discussion of the two matching algorithms
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pcre2partial details of the partial matching facility
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.\" JOIN
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pcre2pattern syntax and semantics of supported
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regular expressions
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pcre2pattern syntax and semantics of supported regular
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expression patterns
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pcre2perform discussion of performance issues
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pcre2posix the POSIX-compatible C API for the 8-bit library
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pcre2sample discussion of the pcre2demo program
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pcre2stack discussion of stack usage
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pcre2syntax quick syntax reference
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pcre2test description of the \fBpcre2test\fP testing command
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pcre2test description of the \fBpcre2test\fP command
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pcre2unicode discussion of Unicode and UTF support
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.sp
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In the "man" and HTML formats, there is also a short page for each C library
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@ -176,6 +177,6 @@ use my two initials, followed by the two digits 10, at the domain cam.ac.uk.
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.rs
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.sp
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.nf
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Last updated: 03 November 2014
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Last updated: 18 November 2014
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Copyright (c) 1997-2014 University of Cambridge.
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.fi
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189
doc/pcre2api.3
189
doc/pcre2api.3
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@ -1,4 +1,4 @@
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.TH PCRE2API 3 "11 November 2014" "PCRE2 10.00"
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.TH PCRE2API 3 "18 November 2014" "PCRE2 10.00"
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.SH NAME
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PCRE2 - Perl-compatible regular expressions (revised API)
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.sp
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@ -384,12 +384,9 @@ U+000C), NEL (next line, U+0085), LS (line separator, U+2028), and PS
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.P
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Each of the first three conventions is used by at least one operating system as
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its standard newline sequence. When PCRE2 is built, a default can be specified.
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The default default is LF, which is the Unix standard. When PCRE2 is run, the
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default can be overridden, either when a pattern is compiled, or when it is
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matched.
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.P
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The newline convention can be changed when calling \fBpcre2_compile()\fP, or it
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can be specified by special text at the start of the pattern itself; this
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The default default is LF, which is the Unix standard. However, the newline
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convention can be changed by an application when calling \fBpcre2_compile()\fP,
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or it can be specified by special text at the start of the pattern itself; this
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overrides any other settings. See the
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.\" HREF
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\fBpcre2pattern\fP
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@ -409,8 +406,8 @@ section on \fBpcre2_match()\fP options
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below.
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.P
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The choice of newline convention does not affect the interpretation of
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the \en or \er escape sequences, nor does it affect what \eR matches, which has
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its own separate control.
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the \en or \er escape sequences, nor does it affect what \eR matches; this has
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its own separate convention.
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.
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.
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.SH MULTITHREADING
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@ -423,7 +420,7 @@ designed to be fairly simple for non-threaded applications while at the same
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time ensuring that multithreaded applications can use it.
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.P
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There are several different blocks of data that are used to pass information
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between the application and the PCRE libraries.
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between the application and the PCRE2 libraries.
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.P
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(1) A pointer to the compiled form of a pattern is returned to the user when
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\fBpcre2_compile()\fP is successful. The data in the compiled pattern is fixed,
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@ -529,11 +526,11 @@ The memory used for a general context should be freed by calling:
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A compile context is required if you want to change the default values of any
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of the following compile-time parameters:
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.sp
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What \eR matches (Unicode newlines or CR, LF, CRLF only);
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PCRE2's character tables;
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The newline character sequence;
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The compile time nested parentheses limit;
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An external function for stack checking.
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What \eR matches (Unicode newlines or CR, LF, CRLF only)
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PCRE2's character tables
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The newline character sequence
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The compile time nested parentheses limit
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An external function for stack checking
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.sp
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A compile context is also required if you are using custom memory management.
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If none of these apply, just pass NULL as the context argument of
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@ -562,9 +559,8 @@ PCRE2_ERROR_BADDATA if invalid data is detected.
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.sp
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The value must be PCRE2_BSR_ANYCRLF, to specify that \eR matches only CR, LF,
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or CRLF, or PCRE2_BSR_UNICODE, to specify that \eR matches any Unicode line
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ending sequence. The value of this parameter does not affect what is compiled;
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it is just saved with the compiled pattern. The value is used by the JIT
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compiler and by the two interpreted matching functions, \fIpcre2_match()\fP and
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ending sequence. The value is used by the JIT compiler and by the two
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interpreted matching functions, \fIpcre2_match()\fP and
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\fIpcre2_dfa_match()\fP.
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.sp
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.nf
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@ -678,12 +674,12 @@ patterns that are not anchored, the count restarts from zero for each position
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in the subject string. This limit is not relevant to \fBpcre2_dfa_match()\fP,
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which ignores it.
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.P
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When \fBpcre2_match()\fP is called with a pattern that was successfully studied
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with \fBpcre2_jit_compile()\fP, the way that the matching is executed is
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entirely different. However, there is still the possibility of runaway matching
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that goes on for a very long time, and so the \fImatch_limit\fP value is also
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used in this case (but in a different way) to limit how long the matching can
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continue.
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When \fBpcre2_match()\fP is called with a pattern that was successfully
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processed by \fBpcre2_jit_compile()\fP, the way in which matching is executed
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is entirely different. However, there is still the possibility of runaway
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matching that goes on for a very long time, and so the \fImatch_limit\fP value
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is also used in this case (but in a different way) to limit how long the
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matching can continue.
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.P
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The default value for the limit can be set when PCRE2 is built; the default
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default is 10 million, which handles all but the most extreme cases. If the
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@ -744,15 +740,16 @@ documentation. See the
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.\" HREF
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\fBpcre2build\fP
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.\"
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documentation for details of how to build PCRE2. Using the heap for recursion
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is a non-standard way of building PCRE2, for use in environments that have
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limited stacks. Because of the greater use of memory management,
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\fBpcre2_match()\fP runs more slowly. Functions that are different to the
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general custom memory functions are provided so that special-purpose external
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code can be used for this case, because the memory blocks are all the same
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size. The blocks are retained by \fBpcre2_match()\fP until it is about to exit
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so that they can be re-used when possible during the match. In the absence of
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these functions, the normal custom memory management functions are used, if
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documentation for details of how to build PCRE2.
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.P
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Using the heap for recursion is a non-standard way of building PCRE2, for use
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in environments that have limited stacks. Because of the greater use of memory
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management, \fBpcre2_match()\fP runs more slowly. Functions that are different
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to the general custom memory functions are provided so that special-purpose
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external code can be used for this case, because the memory blocks are all the
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same size. The blocks are retained by \fBpcre2_match()\fP until it is about to
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exit so that they can be re-used when possible during the match. In the absence
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of these functions, the normal custom memory management functions are used, if
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supplied, otherwise the system functions.
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.
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.
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@ -784,9 +781,10 @@ available:
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PCRE2_CONFIG_BSR
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.sp
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The output is an integer whose value indicates what character sequences the \eR
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escape sequence matches by default. A value of 0 means that \eR matches any
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Unicode line ending sequence; a value of 1 means that \eR matches only CR, LF,
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or CRLF. The default can be overridden when a pattern is compiled or matched.
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escape sequence matches by default. A value of PCRE2_BSR_UNICODE means that \eR
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matches any Unicode line ending sequence; a value of PCRE2_BSR_ANYCRLF means
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that \eR matches only CR, LF, or CRLF. The default can be overridden when a
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pattern is compiled.
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.sp
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PCRE2_CONFIG_JIT
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.sp
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@ -796,7 +794,7 @@ compiling is available; otherwise it is set to zero.
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PCRE2_CONFIG_JITTARGET
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.sp
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The \fIwhere\fP argument should point to a buffer that is at least 48 code
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units long. (The exact length needed can be found by calling
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units long. (The exact length required can be found by calling
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\fBpcre2_config()\fP with \fBwhere\fP set to NULL.) The buffer is filled with a
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string that contains the name of the architecture for which the JIT compiler is
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configured, for example "x86 32bit (little endian + unaligned)". If JIT support
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@ -829,11 +827,11 @@ Further details are given with \fBpcre2_match()\fP below.
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The output is an integer whose value specifies the default character sequence
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that is recognized as meaning "newline". The values are:
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.sp
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1 Carriage return (CR)
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2 Linefeed (LF)
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3 Carriage return, linefeed (CRLF)
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4 Any Unicode line ending
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5 Any of CR, LF, or CRLF
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PCRE2_NEWLINE_CR Carriage return (CR)
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PCRE2_NEWLINE_LF Linefeed (LF)
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PCRE2_NEWLINE_CRLF Carriage return, linefeed (CRLF)
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PCRE2_NEWLINE_ANY Any Unicode line ending
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PCRE2_NEWLINE_ANYCRLF Any of CR, LF, or CRLF
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.sp
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The default should normally correspond to the standard sequence for your
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operating system.
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@ -865,7 +863,7 @@ heap instead of recursive function calls.
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PCRE2_CONFIG_UNICODE_VERSION
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.sp
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The \fIwhere\fP argument should point to a buffer that is at least 24 code
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units long. (The exact length needed can be found by calling
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units long. (The exact length required can be found by calling
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\fBpcre2_config()\fP with \fBwhere\fP set to NULL.) If PCRE2 has been compiled
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without Unicode support, the buffer is filled with the text "Unicode not
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supported". Otherwise, the Unicode version string (for example, "7.0.0") is
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@ -880,7 +878,7 @@ otherwise it is set to zero. Unicode support implies UTF support.
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PCRE2_CONFIG_VERSION
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.sp
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The \fIwhere\fP argument should point to a buffer that is at least 12 code
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units long. (The exact length needed can be found by calling
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units long. (The exact length required can be found by calling
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\fBpcre2_config()\fP with \fBwhere\fP set to NULL.) The buffer is filled with
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the PCRE2 version string, zero-terminated. The number of code units used is
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returned. This is the length of the string plus one unit for the terminating
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@ -899,16 +897,16 @@ zero.
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.B pcre2_code_free(pcre2_code *\fIcode\fP);
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.fi
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.P
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This function compiles a pattern, defined by a pointer to a string of code
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units and a length, into an internal form. If the pattern is zero-terminated,
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the length should be specified as PCRE2_ZERO_TERMINATED. The function returns a
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pointer to a block of memory that contains the compiled pattern and related
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data. The caller must free the memory by calling \fBpcre2_code_free()\fP when
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it is no longer needed.
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The \fBpcre2_compile()\fP function compiles a pattern into an internal form.
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The pattern is defined by a pointer to a string of code units and a length, If
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the pattern is zero-terminated, the length can be specified as
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PCRE2_ZERO_TERMINATED. The function returns a pointer to a block of memory that
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contains the compiled pattern and related data. The caller must free the memory
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by calling \fBpcre2_code_free()\fP when it is no longer needed.
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.P
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If the compile context argument \fIccontext\fP is NULL, the memory is obtained
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by calling \fBmalloc()\fP. Otherwise, it is obtained from the same memory
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function that was used for the compile context.
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If the compile context argument \fIccontext\fP is NULL, memory for the compiled
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pattern is obtained by calling \fBmalloc()\fP. Otherwise, it is obtained from
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the same memory function that was used for the compile context.
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.P
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The \fIoptions\fP argument contains various bit settings that affect the
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compilation. It should be zero if no options are required. The available
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@ -1235,7 +1233,7 @@ in the
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\fBpcre2pattern\fP
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.\"
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page. If you set PCRE2_UCP, matching one of the items it affects takes much
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longer. The option is available only if PCRE2 has been compiled with UTF
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longer. The option is available only if PCRE2 has been compiled with Unicode
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support.
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.sp
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PCRE2_UNGREEDY
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@ -1248,9 +1246,10 @@ with Perl. It can also be set by a (?U) option setting within the pattern.
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.sp
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This option causes PCRE2 to regard both the pattern and the subject strings
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that are subsequently processed as strings of UTF characters instead of
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single-code-unit strings. However, it is available only when PCRE2 is built to
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include UTF support. If not, the use of this option provokes an error. Details
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of how this option changes the behaviour of PCRE2 are given in the
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single-code-unit strings. It is available when PCRE2 is built to include
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Unicode support (which is the default). If Unicode support is not available,
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the use of this option provokes an error. Details of how this option changes
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the behaviour of PCRE2 are given in the
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.\" HREF
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\fBpcre2unicode\fP
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.\"
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@ -1314,13 +1313,12 @@ Most, but not all patterns can be optimized by the JIT compiler.
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.sp
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PCRE2 handles caseless matching, and determines whether characters are letters,
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digits, or whatever, by reference to a set of tables, indexed by character code
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point. When running in UTF-8 mode, or using the 16-bit or 32-bit libraries,
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this applies only to characters with code points less than 256. By default,
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higher-valued code points never match escapes such as \ew or \ed. However, if
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PCRE2 is built with UTF support, all characters can be tested with \ep and \eP,
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or, alternatively, the PCRE2_UCP option can be set when a pattern is compiled;
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this causes \ew and friends to use Unicode property support instead of the
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built-in tables.
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point. This applies only to characters whose code points are less than 256. By
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default, higher-valued code points never match escapes such as \ew or \ed.
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However, if PCRE2 is built with UTF support, all characters can be tested with
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\ep and \eP, or, alternatively, the PCRE2_UCP option can be set when a pattern
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is compiled; this causes \ew and friends to use Unicode property support
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instead of the built-in tables.
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.P
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The use of locales with Unicode is discouraged. If you are handling characters
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with code points greater than 128, you should either use Unicode support, or
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@ -1433,9 +1431,9 @@ are no back references.
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PCRE2_INFO_BSR
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.sp
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The output is a uint32_t whose value indicates what character sequences the \eR
|
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escape sequence matches by default. A value of 0 means that \eR matches any
|
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Unicode line ending sequence; a value of 1 means that \eR matches only CR, LF,
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or CRLF. The default can be overridden when a pattern is matched.
|
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escape sequence matches. A value of PCRE2_BSR_UNICODE means that \eR matches
|
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any Unicode line ending sequence; a value of PCRE2_BSR_ANYCRLF means that \eR
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matches only CR, LF, or CRLF.
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.sp
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PCRE2_INFO_CAPTURECOUNT
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.sp
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@ -1623,17 +1621,16 @@ different for each compiled pattern.
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.sp
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PCRE2_INFO_NEWLINE
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.sp
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The output is a \fBuint32_t\fP whose value specifies the default character
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sequence that will be recognized as meaning "newline" while matching. The
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values are:
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The output is a \fBuint32_t\fP with one of the following values:
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.sp
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1 Carriage return (CR)
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2 Linefeed (LF)
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3 Carriage return, linefeed (CRLF)
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4 Any Unicode line ending
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5 Any of CR, LF, or CRLF
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PCRE2_NEWLINE_CR Carriage return (CR)
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PCRE2_NEWLINE_LF Linefeed (LF)
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PCRE2_NEWLINE_CRLF Carriage return, linefeed (CRLF)
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PCRE2_NEWLINE_ANY Any Unicode line ending
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PCRE2_NEWLINE_ANYCRLF Any of CR, LF, or CRLF
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.sp
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The default can be overridden when a pattern is matched.
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This specifies the default character sequence that will be recognized as
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meaning "newline" while matching.
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.sp
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PCRE2_INFO_RECURSIONLIMIT
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.sp
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@ -1671,30 +1668,32 @@ Information about successful and unsuccessful matches is placed in a match
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data block, which is an opaque structure that is accessed by function calls. In
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particular, the match data block contains a vector of offsets into the subject
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string that define the matched part of the subject and any substrings that were
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capured. This is know as the \fIovector\fP.
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captured. This is know as the \fIovector\fP.
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.P
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Before calling \fBpcre2_match()\fP or \fBpcre2_dfa_match()\fP you must create a
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match data block by calling one of the creation functions above. For
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\fBpcre2_match_data_create()\fP, the first argument is the number of pairs of
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offsets in the \fIovector\fP. One pair of offsets is required to identify the
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string that matched the whole pattern, with another pair for each captured
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substring. For example, a value of 4 creates enough space to record the matched
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portion of the subject plus three captured substrings. A minimum of at least 1
|
||||
pair is imposed by \fBpcre2_match_data_create()\fP, so it is always possible to
|
||||
return the overall matched string.
|
||||
Before calling \fBpcre2_match()\fP, \fBpcre2_dfa_match()\fP, or
|
||||
\fBpcre2_jit_match()\fP you must create a match data block by calling one of
|
||||
the creation functions above. For \fBpcre2_match_data_create()\fP, the first
|
||||
argument is the number of pairs of offsets in the \fIovector\fP. One pair of
|
||||
offsets is required to identify the string that matched the whole pattern, with
|
||||
another pair for each captured substring. For example, a value of 4 creates
|
||||
enough space to record the matched portion of the subject plus three captured
|
||||
substrings. A minimum of at least 1 pair is imposed by
|
||||
\fBpcre2_match_data_create()\fP, so it is always possible to return the overall
|
||||
matched string.
|
||||
.P
|
||||
For \fBpcre2_match_data_create_from_pattern()\fP, the first argument is a
|
||||
pointer to a compiled pattern. In this case the ovector is created to be
|
||||
exactly the right size to hold all the substrings a pattern might capture.
|
||||
.P
|
||||
The second argument of both these functions ia a pointer to a general context,
|
||||
The second argument of both these functions is a pointer to a general context,
|
||||
which can specify custom memory management for obtaining the memory for the
|
||||
match data block. If you are not using custom memory management, pass NULL.
|
||||
.P
|
||||
A match data block can be used many times, with the same or different compiled
|
||||
patterns. When it is no longer needed, it should be freed by calling
|
||||
\fBpcre2_match_data_free()\fP. How to extract information from a match data
|
||||
block after a match operation is described in the sections on
|
||||
\fBpcre2_match_data_free()\fP. You can extract information from a match data
|
||||
block after a match operation has finished, using functions that are described
|
||||
in the sections on
|
||||
.\" HTML <a href="#matchedstrings">
|
||||
.\" </a>
|
||||
matched strings
|
||||
|
|
@ -1819,12 +1818,10 @@ zero. The only bits that may be set are PCRE2_ANCHORED, PCRE2_NOTBOL,
|
|||
PCRE2_NOTEOL, PCRE2_NOTEMPTY, PCRE2_NOTEMPTY_ATSTART, PCRE2_NO_UTF_CHECK,
|
||||
PCRE2_PARTIAL_HARD, and PCRE2_PARTIAL_SOFT. Their action is described below.
|
||||
.P
|
||||
If the pattern was successfully processed by the just-in-time (JIT) compiler,
|
||||
the only supported options for matching using the JIT code are PCRE2_NOTBOL,
|
||||
PCRE2_NOTEOL, PCRE2_NOTEMPTY, PCRE2_NOTEMPTY_ATSTART, PCRE2_NO_UTF_CHECK,
|
||||
PCRE2_PARTIAL_HARD, and PCRE2_PARTIAL_SOFT. If an unsupported option is used,
|
||||
JIT matching is disabled and the normal interpretive code in
|
||||
\fBpcre2_match()\fP is run.
|
||||
Setting PCRE2_ANCHORED at match time is not supported by the just-in-time (JIT)
|
||||
compiler. If it is set, JIT matching is disabled and the normal interpretive
|
||||
code in \fBpcre2_match()\fP is run. The remaining options are supported for JIT
|
||||
matching.
|
||||
.sp
|
||||
PCRE2_ANCHORED
|
||||
.sp
|
||||
|
|
@ -2704,6 +2701,6 @@ Cambridge, England.
|
|||
.rs
|
||||
.sp
|
||||
.nf
|
||||
Last updated: 11 November 2014
|
||||
Last updated: 18 November 2014
|
||||
Copyright (c) 1997-2014 University of Cambridge.
|
||||
.fi
|
||||
|
|
|
|||
|
|
@ -58,8 +58,8 @@ ISGCC=0
|
|||
|
||||
# If the compiler is gcc, add a lot of warning switches.
|
||||
|
||||
cc --version >zzz 2>/dev/null
|
||||
if [ $? -eq 0 ] && grep GCC zzz >/dev/null; then
|
||||
cc --version >/tmp/pcre2ccversion 2>/dev/null
|
||||
if [ $? -eq 0 ] && grep GCC /tmp/pcre2ccversion >/dev/null; then
|
||||
ISGCC=1
|
||||
CFLAGS="$CFLAGS -Wall"
|
||||
CFLAGS="$CFLAGS -Wno-overlength-strings"
|
||||
|
|
@ -77,7 +77,7 @@ if [ $? -eq 0 ] && grep GCC zzz >/dev/null; then
|
|||
CFLAGS="$CFLAGS -Wmissing-prototypes"
|
||||
CFLAGS="$CFLAGS -Wstrict-prototypes"
|
||||
fi
|
||||
|
||||
rm -f /tmp/pcre2ccversion
|
||||
|
||||
# This function runs a single test with the set of configuration options that
|
||||
# are in $opts. The source directory must be set in srcdir. The function must
|
||||
|
|
@ -129,8 +129,6 @@ runtest()
|
|||
|
||||
./pcre2test -C jit >/dev/null
|
||||
jit=$?
|
||||
./pcre2test -C unicode >/dev/null
|
||||
utf=$?
|
||||
./pcre2test -C pcre2-8 >/dev/null
|
||||
pcre2_8=$?
|
||||
|
||||
|
|
@ -164,7 +162,7 @@ runtest()
|
|||
echo "Skipping pcre2grep tests: newline is $nl"
|
||||
fi
|
||||
|
||||
if [ "$jit" -gt 0 -a $utf -gt 0 ]; then
|
||||
if [ "$jit" -gt 0 ]; then
|
||||
echo "Running JIT regression tests $withvalgrind"
|
||||
$cvalgrind $srcdir/pcre2_jit_test >teststdout 2>teststderr
|
||||
if [ $? -ne 0 -o -s teststderr ]; then
|
||||
|
|
@ -175,7 +173,7 @@ runtest()
|
|||
exit 1
|
||||
fi
|
||||
else
|
||||
echo "Skipping JIT regression tests: JIT or UTF not enabled"
|
||||
echo "Skipping JIT regression tests: JIT is not enabled"
|
||||
fi
|
||||
}
|
||||
|
||||
|
|
|
|||
51
maint/README
51
maint/README
|
|
@ -65,7 +65,7 @@ Updating to a new Unicode release
|
|||
|
||||
When there is a new release of Unicode, the files in Unicode.tables must be
|
||||
refreshed from the web site. If the new version of Unicode adds new character
|
||||
scripts, the source file pacr2_ucp.h and both the MultiStage2.py and the
|
||||
scripts, the source file pcre2_ucp.h and both the MultiStage2.py and the
|
||||
GenerateUtt.py scripts must be edited to add the new names. Then MultiStage2.py
|
||||
can be run to generate a new version of pcre2_ucd.c, and GenerateUtt.py can be
|
||||
run to generate the tricky tables for inclusion in pcre2_tables.c.
|
||||
|
|
@ -73,7 +73,7 @@ run to generate the tricky tables for inclusion in pcre2_tables.c.
|
|||
If MultiStage2.py gives the error "ValueError: list.index(x): x not in list",
|
||||
the cause is usually a missing (or misspelt) name in the list of scripts. I
|
||||
couldn't find a straightforward list of scripts on the Unicode site, but
|
||||
there's a useful Wikipedia page that list them, and notes the Unicode version
|
||||
there's a useful Wikipedia page that lists them, and notes the Unicode version
|
||||
in which they were introduced:
|
||||
|
||||
http://en.wikipedia.org/wiki/Unicode_scripts#Table_of_Unicode_scripts
|
||||
|
|
@ -130,7 +130,7 @@ distribution for a new release.
|
|||
systems, using different compilers as well. For example, on Solaris it is
|
||||
helpful to test using Sun's cc compiler as a change from gcc. Adding
|
||||
-xarch=v9 to the cc options does a 64-bit test, but it also needs -S 64 for
|
||||
pcretest to increase the stack size for test 2. Since I retired I can no
|
||||
pcre2test to increase the stack size for test 2. Since I retired I can no
|
||||
longer do this, but instead I rely on putting out release candidates for
|
||||
folks on the pcre-dev list to test.
|
||||
|
||||
|
|
@ -194,7 +194,7 @@ and the zipball. Double-check with "svn status", then create an SVN tagged
|
|||
copy:
|
||||
|
||||
svn copy svn://vcs.exim.org/pcre2/code/trunk \
|
||||
svn://vcs.exim.org/pcre2/code/tags/pcre-8.xx
|
||||
svn://vcs.exim.org/pcre2/code/tags/pcre-10.xx
|
||||
|
||||
When the new release is out, don't forget to tell webmaster@pcre.org and the
|
||||
mailing list. Also, update the list of version numbers in Bugzilla (edit
|
||||
|
|
@ -206,8 +206,7 @@ Future ideas (wish list)
|
|||
|
||||
This section records a list of ideas so that they do not get forgotten. They
|
||||
vary enormously in their usefulness and potential for implementation. Some are
|
||||
very sensible; some are rather wacky. Some have been on this list for years;
|
||||
others are relatively new.
|
||||
very sensible; some are rather wacky. Some have been on this list for years.
|
||||
|
||||
. Optimization
|
||||
|
||||
|
|
@ -226,42 +225,38 @@ others are relatively new.
|
|||
over the existing "required code unit" feature that just remembers one code
|
||||
unit.
|
||||
|
||||
* Remember an initial string rather than just 1 code unit?
|
||||
* Remember an initial string rather than just 1 code unit.
|
||||
|
||||
* A required code unit from alternatives - not just the last unit, but an
|
||||
earlier one if common to all alternatives.
|
||||
|
||||
o Friedl contains other ideas.
|
||||
* Friedl contains other ideas.
|
||||
|
||||
* The code does not set initial code unit flags for Unicode property types
|
||||
such as \p; I don't know how much benefit there would be for, for example,
|
||||
setting the bits for 0-9 and all values >= xC0 (in 8-bit mode) when a
|
||||
pattern starts with \p{N}.
|
||||
|
||||
* There is scope for more "auto-possessifying" in connection with \p and \P.
|
||||
|
||||
. If Perl gets to a consistent state over the settings of capturing sub-
|
||||
patterns inside repeats, see if we can match it. One example of the
|
||||
difference is the matching of /(main(O)?)+/ against mainOmain, where PCRE
|
||||
leaves $2 set. In Perl, it's unset. Changing this in PCRE will be very hard
|
||||
difference is the matching of /(main(O)?)+/ against mainOmain, where PCRE2
|
||||
leaves $2 set. In Perl, it's unset. Changing this in PCRE2 will be very hard
|
||||
because I think it needs much more state to be remembered.
|
||||
|
||||
. Perl 6 will be a revolution. Is it a revolution too far for PCRE?
|
||||
|
||||
. Line endings:
|
||||
|
||||
* Option to use NUL as a line terminator in subject strings. This could now
|
||||
be done relatively easily since the extension to support LF, CR, and CRLF.
|
||||
If it is done, a suitable option for pcre2grep is also required.
|
||||
. An option to use NUL as a line terminator in subject strings. This could be
|
||||
done relatively easily. If it is done, a suitable option for pcre2grep is
|
||||
also required.
|
||||
|
||||
. Catch SIGSEGV for stack overflows?
|
||||
|
||||
. A feature to suspend a match via a callout was once requested.
|
||||
|
||||
. Option to convert results into character offsets and character lengths.
|
||||
. An option to convert results into character offsets and character lengths.
|
||||
|
||||
. Option for pcre2grep to scan only the start of a file. I am not keen - this
|
||||
is the job of "head".
|
||||
. An option for pcre2grep to scan only the start of a file. I am not keen -
|
||||
this is the job of "head".
|
||||
|
||||
. A (non-Unix) user wanted pcregrep options to (a) list a file name just once,
|
||||
preceded by a blank line, instead of adding it to every matched line, and (b)
|
||||
|
|
@ -274,11 +269,6 @@ others are relatively new.
|
|||
to switch this dynamically. It would have to be specified when PCRE2 was
|
||||
compiled. PCRE2 would then call a function every time it wanted a character.
|
||||
|
||||
. Wild thought: the ability to compile from PCRE2's internal code to a real
|
||||
FSM and a very fast (third) matcher to process the result. There would be
|
||||
even more restrictions than for pcre2_dfa_exec(), however. This is not easy.
|
||||
This is probably obsolete now that we have the JIT support.
|
||||
|
||||
. pcre2grep: add -rs for a sorted recurse? Having to store file names and sort
|
||||
them will of course slow it down.
|
||||
|
||||
|
|
@ -296,10 +286,10 @@ others are relatively new.
|
|||
pattern.
|
||||
|
||||
. Pcre2grep: an option to specify the output line separator, either as a string
|
||||
or select from a fixed list. This is not dead easy, because at the moment it
|
||||
outputs whatever is in the input file.
|
||||
or select from a fixed list. This is not straightforward, because at the
|
||||
moment it outputs whatever is in the input file.
|
||||
|
||||
. Improve the code for duplicate checking in pcre_dfa_exec(). An incomplete,
|
||||
. Improve the code for duplicate checking in pcre_dfa_match(). An incomplete,
|
||||
non-thread-safe patch showed that this can help performance for patterns
|
||||
where there are many alternatives. However, a simple thread-safe
|
||||
implementation that I tried made things worse in many simple cases, so this
|
||||
|
|
@ -308,8 +298,7 @@ others are relatively new.
|
|||
. PCRE2 cannot at present distinguish between subpatterns with different names,
|
||||
but the same number (created by the use of ?|). In order to do so, a way of
|
||||
remembering *which* subpattern numbered n matched is needed. Bugzilla #760.
|
||||
Now that (*MARK) has been implemented, it can perhaps be used as a way round
|
||||
this problem.
|
||||
(*MARK) can perhaps be used as a way round this problem.
|
||||
|
||||
. Instead of having #ifdef HAVE_CONFIG_H in each module, put #include
|
||||
"something" and the the #ifdef appears only in one place, in "something".
|
||||
|
|
@ -317,4 +306,4 @@ others are relatively new.
|
|||
Philip Hazel
|
||||
Email local part: ph10
|
||||
Email domain: cam.ac.uk
|
||||
Last updated: 25 October 2014
|
||||
Last updated: 18 November 2014
|
||||
|
|
|
|||
Loading…
Reference in New Issue