author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 11 Jun 2010 14:42:15 +0300 | |
changeset 74 | 91031d3aab7d |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
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dd21522fd290
Revision: 200911
Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
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This file has advice to help you merge newer versions of PCRE. |
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JavaScriptCore's PCRE is currently based on: |
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PCRE 6.4 |
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With the following differences. |
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1) We added a PCRE_UTF16 define that makes a library that works on UTF-16 strings |
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rather than on ASCII or UTF-8. |
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We introduced the public typedef pcre_char and the internal typedef pcre_uchar. |
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We changed access to the digitab and ctypes arrays to range check and work only |
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on values in the 0-255 range. |
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We changed GETCHAR, GETCHRATEST, GETCHARINC, GETCHARINCTEST, and GETCHARLEN |
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so they work on UTF-16. |
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We added ISMIDCHAR to abstract the notion of characters to skip over, and |
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handle it right regardless of UTF-16 or UTF-8, and changed code to call it |
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when appropriate. |
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We added GETUTF8CHARLEN and GETUTF8CHARINC, to be used in cases where we always |
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process UTF-8, even if the subject string is UTF-16, and changed code to call |
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them when appropriate. |
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2) We added a JAVASCRIPT define that turns off and alters various features to match |
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the requirements of the JavaScript language specification. |
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We removed these: |
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\C \E \G \L \N \P \Q \U \X \Z |
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\e \l \p \u \z |
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[::] [..] [==] |
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(?#) (?<=) (?<!) (?>) |
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(?C) (?P) (?R) |
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(?0) (and 1-9) |
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(?imsxUX) |
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And we added these: |
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\u \v |
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And we changed the semantics for \1-style backreferences to parentheses that |
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are not included in a match to match the empty string instead of not matching |
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anything: This is a difference between the JavaScript language specification and |
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the perl script. |
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And we include ASCII 0x0B as a space. |
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3) We made a more-efficient version of the NO_RECURSE mode that uses goto or computed |
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goto statements instead of setjmp/longjmp, since it's so much faster that way. |
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We also allocated the first 16 stack frames on the stack instead of using malloc |
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every time; we use malloc for deeper nesting. |
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This included adding a numeric parameter to the RMATCH macro. |
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4) The original PCRE relied on having the input be a null-terminated string, |
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even though pcre_exec takes a length parameter. We removed that restriction, |
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passing additional parameters internally to make sure the code does not read |
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off the end of the input buffer. |
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We added the macro GETCHARLENEND to be used in some places where GETCHARLEN |
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might otherwise walk off the end of the buffer. |
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5) We added code to forbid values that are not Unicode characters from being used in |
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\x and \u escape sequences in regular expressions. |
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6) We changed the names of the public entry points to have a kjs prefix so they don't |
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collide with a "real" copy of PCRE at link or load time. |
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7) We added a hand-edited pcre-config.h, which is used instead of a configure-generated |
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config.h file. Note, this is made from the config.h.in from the PCRE distribution. |
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8) We eliminated non-ASCII characters from the source files (they were used only |
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in one or two places). |
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9) We removed many unused source files. |
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10) We marked some additional global data tables const. |
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11) And we fixed some compiler warnings. |
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For easy merging: |
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1) We look for approaches that minimize changes to the base PCRE code. |
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2) When making global changes we leave code alone that we're not compiling. |
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So code that's inside #if !JAVASCRIPT need not have the other changes above. |
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This can be a bit strange. For example, there's a choice about what to do with |
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the code to handle an end of pattern pointer or length rather than a trailing |
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zero. Our strategy is to not make enhancements to the code that we're not |
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compiling, so if you turned off the JAVASCRIPT flag, you'd find that the |
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range checking changes are incomplete. This is solely to aid merging. |
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3) We are willing to format code strangely to minimize the differences from |
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the base PCRE code. |
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Differences from the base PCRE code should be viewed with these comments in mind. |