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flex error writing output file lex.yy.c Otis, Oregon

Sign in to comment Contact GitHub API Training Shop Blog About © 2016 GitHub, Inc. Three options take string-delimited values, offset with '=': %option outfile="ABC" is equivalent to -oABC, and %option prefix="XYZ" is equivalent to -PXYZ. This is the opposite of always- interactive. My CEO wants permanent access to every employee's emails.

This option implies noyywrap (see below). It slows things down but will attempt matching already matched text against other patterns. As flex scanners do a large amount of buffering, one cannot control where the next input will be read from by simply writing a YY_INPUT which is sensitive to the scanning This option is implied by %option lex-compat.

For example, you could use: #define YY_DECL float lexscan( a, b ) float a, b; to give the scanning routine the name lexscan, returning a float, and taking two floats as A lone -C specifies that the scanner tables should be compressed but neither equivalence classes nor meta-equivalence classes should be used. Export The $PATH Variable, Line-By-Line more hot questions question feed about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / I forward declared the new yylex inside my main file and everything went OK.

but this program works fine on linux which is at my college, at home i use the above mentioned tweaks on windows.. Thank you very much. -----Original Message----- From: "Arthur Schwarz" To: "'최익성'"; Cc: Sent: 2015-07-07 (화) 22:55:12 Subject: RE: [Flex-help] Is it possible to search concurrent strings in flex ? -----Original Message----- Arthur Schwarz. If the special directive %array appears in the first section of the scanner description, then yytext is instead declared char yytext[YYLMAX], where YYLMAX is a macro definition that you can redefine

The definition can subsequently be referred to using "{name}", which will expand to "(definition)". If there is a single caller (the parser), then that caller usually expects a single response, the return value(s). Please don't fill out this field. but sir without yy wrap it says there is an undefined reference to yywrap()..

It terminates the scanner and returns a 0 to the scanner's caller, indicating "all done". The rule is chosen as described above in "How the Input is Matched", and yytext and yyleng set up appropriately. Arthur Schwarz. If you mean the ability to select /abcd/ and /cdef/ given "abcdef" then this requires a backup.

Thus, the above could be extended in the following fashion: %x comment foo %% int line_num = 1; int comment_caller; "/*" { comment_caller = INITIAL; BEGIN(comment); } ... "/*" { comment_caller Terms Privacy Opt Out Choices Advertise Get latest updates about Open Source Projects, Conferences and News. For example: #define TRUE 1 … … … .. These are expressions enclosed inside [: and :] delimiters (which themselves must appear between the '[' and ']' of the character class; other elements may occur inside the character class, too).

The pattern ends at the first non-escaped whitespace character; the remainder of the line is its action. From: Fabricio S. art Re: [Flex-help] I really thank you for your advice. A subsequent reference to {DIGIT}+"."{DIGIT}* is identical to ([0-9])+"."([0-9])* and matches one-or-more digits followed by a '.' followed by zero-or-more digits.

You can change the size by simply #define'ing YYLMAX to a different value in the first section of your flex input. it worked.. A number are equivalent to flex flags or their negation: 7bit -7 option 8bit -8 option align -Ca option backup -b option batch -B option c++ -+ option caseful or case-sensitive How do I explain that this is a terrible idea?

Thanks Will ========================= Details and reproducible example: I'm using flex 2.5.35 and g++ 4.8.4 (the Ubuntu version, 4.8.4-2ubuntu1~14.04). On 8:39AM, Tue, Jul 7, 2015 Arthur Schwarz wrote: > This issue is not whether flex can handle the search, the issue is whether > a lexical analyzer is powerful If you put instrumentation (printf) in the fgets/fputs loop in filter_tee_header in flex, you find the sh variant stops without exiting the loop, whereas the python variant continues on, and deletes From: 최익성 - 2015-07-08 01:04:23 Dear Arthur Schwarz, Tim Schumacher, Will Estes

For example, the follow- ing will cause the scanner to enter the "SPECIAL" start condition whenever yylex() is called and the global vari- able enter_special is true: int enter_special; %x SPECIAL If it returns true (non-zero), then the scanner terminates, returning 0 to its caller. Getting rid of backing up is messy and often may be an enormous amount of work for a complicated scanner. adamjstewart added the build-error label Sep 27, 2016 eschnett commented Sep 27, 2016 I think yylex is the name of the function the user has to define.

In principal, one begins by using the -b flag to generate a lex.backup file. For exam- ple, if one of the tokens is "TOK_NUMBER", part of the scanner might look like: %{ #include "y.tab.h" %} %% [0-9]+ yylval = atoi( yytext ); return TOK_NUMBER; OPTIONS The reject and yymore options are available to override its decision as to whether you use the options, either by setting them (e.g., %option reject) to indicate the feature is indeed Paranhos - 2016-03-05 16:30:52 On 03/04/2016 11:33 PM, Chris verBurg wrote: > I gave this a shot on my own (using the same version) and got it working > with

But > the point is the YY_DECL worked. > > -Chris > > > On Wed, Mar 2, 2016 at 6:13 AM, Fabricio S. The advantage of using %pointer is substantially faster scan- ning and no buffer overflow when matching very large tokens (unless you run out of dynamic memory). REJECT should be avoided at all costs when performance is important. Here some simple example in gist [1].

Whenever a pattern is recognized and the global yy_flex_debug is non-zero (which is the default), the scanner will write to stderr a line of the form: --accepting rule at line 53 The following action will take the current token and cause it to be rescanned enclosed in parenthe- ses. { int i; /* Copy yytext because unput() trashes yytext */ char *yycopy If your goal is instead to squeeze out a lot more performance, you should be using the -Cf or -CF options (discussed below), which turn on -B automatically anyway. -F specifies Some notes on patterns: - A negated character class such as the example "[^A- Z]" above will match a newline unless "\n" (or an equivalent escape sequence) is one of the

This is done by including %option directives in the first section of the scanner specifica- tion. Paranhos Re: [Flex-help] Error changing yylex return. According to FLEX manual it's possible to change how yylex is > declared[1]: > > >This definition may be changed by defining the YY_DECL macro. The switch-over to the new file is immediate (any previously buffered-up input is lost).

The macro yy_set_interactive(is_interactive) can be used to control whether the current buffer is considered inter- active. It has been optimized for dealing well with large sets of rules. This file is then included in the flex scanner. Any information or assistance you can offer is very welcome.

These are, from most expensive to least: REJECT %option yylineno arbitrary trailing context pattern sets that require backing up %array %option interactive %option always-interactive '^' beginning-of-line operator yymore() with the first yylex () + !