345 lines
12 KiB
Text
345 lines
12 KiB
Text
Changes between 2.3 Patch #7 (28Mar91) and 2.3 Patch #6:
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- Fixed out-of-bounds array access that caused bad tables
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to be produced on machines where the bad reference happened
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to yield a 1. This caused problems installing or running
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flex on some Suns, in particular.
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Changes between 2.3 Patch #6 (29Aug90) and 2.3 Patch #5:
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- Fixed a serious bug in yymore() which basically made it
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completely broken. Thanks goes to Jean Christophe of
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the Nethack development team for finding the problem
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and passing along the fix.
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Changes between 2.3 Patch #5 (16Aug90) and 2.3 Patch #4:
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- An up-to-date version of initscan.c so "make test" will
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work after applying the previous patches
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Changes between 2.3 Patch #4 (14Aug90) and 2.3 Patch #3:
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- Fixed bug in hexadecimal escapes which allowed only digits,
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not letters, in escapes
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- Fixed bug in previous "Changes" file!
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Changes between 2.3 Patch #3 (03Aug90) and 2.3 Patch #2:
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- Correction to patch #2 for gcc compilation; thanks goes to
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Paul Eggert for catching this.
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Changes between 2.3 Patch #2 (02Aug90) and original 2.3 release:
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- Fixed (hopefully) headaches involving declaring malloc()
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and free() for gcc, which defines __STDC__ but (often) doesn't
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come with the standard include files such as <stdlib.h>.
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Reordered #ifdef maze in the scanner skeleton in the hope of
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getting the declarations right for cfront and g++, too.
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- Note that this patch supercedes patch #1 for release 2.3,
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which was never announced but was available briefly for
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anonymous ftp.
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Changes between 2.3 (full) release of 28Jun90 and 2.2 (alpha) release:
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User-visible:
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- A lone <<EOF>> rule (that is, one which is not qualified with
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a list of start conditions) now specifies the EOF action for
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*all* start conditions which haven't already had <<EOF>> actions
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given. To specify an end-of-file action for just the initial
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state, use <INITIAL><<EOF>>.
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- -d debug output is now contigent on the global yy_flex_debug
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being set to a non-zero value, which it is by default.
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- A new macro, YY_USER_INIT, is provided for the user to specify
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initialization action to be taken on the first call to the
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scanner. This action is done before the scanner does its
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own initialization.
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- yy_new_buffer() has been added as an alias for yy_create_buffer()
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- Comments beginning with '#' and extending to the end of the line
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now work, but have been deprecated (in anticipation of making
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flex recognize #line directives).
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- The funky restrictions on when semi-colons could follow the
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YY_NEW_FILE and yyless macros have been removed. They now
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behave identically to functions.
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- A bug in the sample redefinition of YY_INPUT in the documentation
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has been corrected.
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- A bug in the sample simple tokener in the documentation has
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been corrected.
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- The documentation on the incompatibilities between flex and
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lex has been reordered so that the discussion of yylineno
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and input() come first, as it's anticipated that these will
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be the most common source of headaches.
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Things which didn't used to be documented but now are:
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- flex interprets "^foo|bar" differently from lex. flex interprets
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it as "match either a 'foo' or a 'bar', providing it comes at the
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beginning of a line", whereas lex interprets it as "match either
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a 'foo' at the beginning of a line, or a 'bar' anywhere".
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- flex initializes the global "yyin" on the first call to the
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scanner, while lex initializes it at compile-time.
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- yy_switch_to_buffer() can be used in the yywrap() macro/routine.
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- flex scanners do not use stdio for their input, and hence when
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writing an interactive scanner one must explictly call fflush()
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after writing out a prompt.
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- flex scanner can be made reentrant (after a fashion) by using
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"yyrestart( yyin );". This is useful for interactive scanners
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which have interrupt handlers that long-jump out of the scanner.
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- a defense of why yylineno is not supported is included, along
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with a suggestion on how to convert scanners which rely on it.
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Other changes:
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- Prototypes and proper declarations of void routines have
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been added to the flex source code, courtesy of Kevin B. Kenny.
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- Routines dealing with memory allocation now use void* pointers
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instead of char* - see Makefile for porting implications.
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- Error-checking is now done when flex closes a file.
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- Various lint tweaks were added to reduce the number of gripes.
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- Makefile has been further parameterized to aid in porting.
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- Support for SCO Unix added.
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- Flex now sports the latest & greatest UC copyright notice
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(which is only slightly different from the previous one).
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- A note has been added to flexdoc.1 mentioning work in progress
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on modifying flex to generate straight C code rather than a
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table-driven automaton, with an email address of whom to contact
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if you are working along similar lines.
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Changes between 2.2 Patch #3 (30Mar90) and 2.2 Patch #2:
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- fixed bug which caused -I scanners to bomb
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Changes between 2.2 Patch #2 (27Mar90) and 2.2 Patch #1:
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- fixed bug writing past end of input buffer in yyunput()
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- fixed bug detecting NUL's at the end of a buffer
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Changes between 2.2 Patch #1 (23Mar90) and 2.2 (alpha) release:
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- Makefile fixes: definition of MAKE variable for systems
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which don't have it; installation of flexdoc.1 along with
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flex.1; fixed two bugs which could cause "bigtest" to fail.
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- flex.skel fix for compiling with g++.
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- README and flexdoc.1 no longer list an out-of-date BITNET address
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for contacting me.
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- minor typos and formatting changes to flex.1 and flexdoc.1.
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Changes between 2.2 (alpha) release of March '90 and previous release:
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User-visible:
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- Full user documentation now available.
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- Support for 8-bit scanners.
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- Scanners now accept NUL's.
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- A facility has been added for dealing with multiple
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input buffers.
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- Two manual entries now. One which fully describes flex
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(rather than just its differences from lex), and the
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other for quick(er) reference.
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- A number of changes to bring flex closer into compliance
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with the latest POSIX lex draft:
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%t support
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flex now accepts multiple input files and concatenates
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them together to form its input
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previous -c (compress) flag renamed -C
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do-nothing -c and -n flags added
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Any indented code or code within %{}'s in section 2 is
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now copied to the output
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- yyleng is now a bona fide global integer.
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- -d debug information now gives the line number of the
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matched rule instead of which number rule it was from
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the beginning of the file.
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- -v output now includes a summary of the flags used to generate
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the scanner.
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- unput() and yyrestart() are now globally callable.
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- yyrestart() no longer closes the previous value of yyin.
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- C++ support; generated scanners can be compiled with C++ compiler.
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- Primitive -lfl library added, containing default main()
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which calls yylex(). A number of routines currently living
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in the scanner skeleton will probably migrate to here
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in the future (in particular, yywrap() will probably cease
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to be a macro and instead be a function in the -lfl library).
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- Hexadecimal (\x) escape sequences added.
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- Support for MS-DOS, VMS, and Turbo-C integrated.
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- The %used/%unused operators have been deprecated. They
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may go away soon.
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Other changes:
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- Makefile enhanced for easier testing and installation.
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- The parser has been tweaked to detect some erroneous
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constructions which previously were missed.
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- Scanner input buffer overflow is now detected.
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- Bugs with missing "const" declarations fixed.
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- Out-of-date Minix/Atari patches provided.
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- Scanners no longer require printf() unless FLEX_DEBUG is being used.
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- A subtle input() bug has been fixed.
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- Line numbers for "continued action" rules (those following
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the special '|' action) are now correct.
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- unput() bug fixed; had been causing problems porting flex to VMS.
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- yymore() handling rewritten to fix bug with interaction
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between yymore() and trailing context.
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- EOF in actions now generates an error message.
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- Bug involving -CFe and generating equivalence classes fixed.
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- Bug which made -CF be treated as -Cf fixed.
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- Support for SysV tmpnam() added.
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- Unused #define's for scanner no longer generated.
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- Error messages which are associated with a particular input
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line are now all identified with their input line in standard
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format.
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- % directives which are valid to lex but not to flex are
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now ignored instead of generating warnings.
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- -DSYS_V flag can now also be specified -DUSG for System V
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compilation.
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Changes between 2.1 beta-test release of June '89 and previous release:
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User-visible:
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- -p flag generates a performance report to stderr. The report
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consists of comments regarding features of the scanner rules
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which result in slower scanners.
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- -b flag generates backtracking information to lex.backtrack.
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This is a list of scanner states which require backtracking
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and the characters on which they do so. By adding rules
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one can remove backtracking states. If all backtracking states
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are eliminated, the generated scanner will run faster.
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Backtracking is not yet documented in the manual entry.
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- Variable trailing context now works, i.e., one can have
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rules like "(foo)*/[ \t]*bletch". Some trailing context
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patterns still cannot be properly matched and generate
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error messages. These are patterns where the ending of the
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first part of the rule matches the beginning of the second
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part, such as "zx*/xy*", where the 'x*' matches the 'x' at
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the beginning of the trailing context. Lex won't get these
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patterns right either.
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- Faster scanners.
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- End-of-file rules. The special rule "<<EOF>>" indicates
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actions which are to be taken when an end-of-file is
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encountered and yywrap() returns non-zero (i.e., indicates
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no further files to process). See manual entry for example.
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- The -r (reject used) flag is gone. flex now scans the input
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for occurrences of the string "REJECT" to determine if the
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action is needed. It tries to be intelligent about this but
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can be fooled. One can force the presence or absence of
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REJECT by adding a line in the first section of the form
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"%used REJECT" or "%unused REJECT".
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- yymore() has been implemented. Similarly to REJECT, flex
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detects the use of yymore(), which can be overridden using
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"%used" or "%unused".
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- Patterns like "x{0,3}" now work (i.e., with lower-limit == 0).
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- Removed '\^x' for ctrl-x misfeature.
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- Added '\a' and '\v' escape sequences.
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- \<digits> now works for octal escape sequences; previously
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\0<digits> was required.
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- Better error reporting; line numbers are associated with rules.
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- yyleng is a macro; it cannot be accessed outside of the
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scanner source file.
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- yytext and yyleng should not be modified within a flex action.
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- Generated scanners #define the name FLEX_SCANNER.
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- Rules are internally separated by YY_BREAK in lex.yy.c rather
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than break, to allow redefinition.
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- The macro YY_USER_ACTION can be redefined to provide an action
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which is always executed prior to the matched rule's action.
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- yyrestart() is a new action which can be used to restart
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the scanner after it has seen an end-of-file (a "real" one,
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that is, one for which yywrap() returned non-zero). It takes
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a FILE* argument indicating a new file to scan and sets
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things up so that a subsequent call to yylex() will start
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scanning that file.
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- Internal scanner names all preceded by "yy_"
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- lex.yy.c is deleted if errors are encountered during processing.
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- Comments may be put in the first section of the input by preceding
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them with '#'.
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Other changes:
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- Some portability-related bugs fixed, in particular for machines
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with unsigned characters or sizeof( int* ) != sizeof( int ).
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Also, tweaks for VMS and Microsoft C (MS-DOS), and identifiers all
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trimmed to be 31 or fewer characters. Shortened file names
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for dinosaur OS's. Checks for allocating > 64K memory
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on 16 bit'ers. Amiga tweaks. Compiles using gcc on a Sun-3.
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- Compressed and fast scanner skeletons merged.
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- Skeleton header files done away with.
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- Generated scanner uses prototypes and "const" for __STDC__.
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- -DSV flag is now -DSYS_V for System V compilation.
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- Removed all references to FTL language.
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- Software now covered by BSD Copyright.
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- flex will replace lex in subsequent BSD releases.
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