The advantage of using `%pointer' is substantially faster scanning and no buffer overflow when matching very large tokens (unless you run out of dynamic memory). This pattern therefore matches either the string "foo" or the string "ba" followed by zero-or-more r's. Paranhos < > [email protected]> wrote: > >> Hello, >> >> I'm trying to change the default return value (int) from yylex to a >> structure. But there is still something amiss, maybe Cygwin specific, maybe not. his comment is here
But > the point is the YY_DECL worked. > > -Chris > > > On Wed, Mar 2, 2016 at 6:13 AM, Fabricio S. The YY_BUFFER_STATE type is a pointer to an opaque struct yy_buffer_state structure, so you may safely initialize YY_BUFFER_STATE variables to `((YY_BUFFER_STATE) 0)' if you wish, and also refer to the opaque a = TRUE; …
Thank you in advance! It seems like your > > redeclaration is not making it into main.c -- I'd suggest maybe next > > looking at the generated flex.h and seeing what it's doing with I'll patch my gmp/configure to not set M4 like this. we have a really terrible sir who knows nothin about the subject..
For >> >example, you could use: >> > >> > #define YY_DECL float lexscan( a, b ) float a, b; >> > >> >> In my flex file I declared this Start conditions flex provides a mechanism for conditionally activating rules. It sounds like you don't want a parser either. 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
Let's see if it works... #6 Updated by Pavel Shved over 5 years ago Status changed from Open to Resolved Configuration from inside of Python script went well, but let's wait For example, the following character classes are all equivalent: [[:alnum:]] [[:alpha:][:digit:] [[:alpha:]0-9] [a-zA-Z0-9] If your scanner is case-insensitive (the `-i' flag), then `[:upper:]' and `[:lower:]' are equivalent to `[:alpha:]'. This option implies noyywrap (see below). `never-interactive' instructs flex to generate a scanner which never considers its input "interactive" (again, no call made to `isatty())'. PS: I've committed some HP-UX related fixes to my git tree, although this flex related problem is specific to your installation and not solved by my recent patches, please use the
It can be reassigned by the user. Once the match is determined, the text corresponding to the match (called the token) is made available in the global character pointer yytext, and its length in the global integer yyleng. Note, however, that unless you generate your scanner using the `-Cf' or `-CF' table compression options, use of `-7' will save only a small amount of table space, and make your You can tell whether flex generated a 7-bit or an 8-bit scanner by inspecting the flag summary in the `-v' output as described above.
libtool recommended some settings and just to be clear that things worked differently on the build end, I set the version to 2:0. https://ftp.gnu.org/old-gnu/Manuals/flex-2.5.4/html_mono/flex.html This code is derived from software contributed to Berkeley by Vern Paxson. YY_INPUT is only called when the scanner reaches the end of its buffer, which may be a long time after scanning a statement such as an "include" which requires switching the If yes then what are the steps for that Regards, Yogesh Re: [Flex-help] Error changing yylex return.
Note that yyless is a macro and can only be used in the flex input file, not from other source files. `unput(c)' puts the character c back onto the input stream. http://interskillmedia.com/flex-error/flex-error.html When we run our configuration tools from our consoles it works. By default it will treat it as as three tokens, the integer "123", a dot ('.'), and the integer "456". These last two bytes are not scanned; thus, scanning consists of `base' through `base[size-2]', inclusive.
Please don't fill out this field. this is the error : J:\> gcc lex.yy.c lccc.l: In function 'main': lccc.l:13: error: stray'\223' in program lccc.l:13: error: 'lines' undeclared (first use in this function ) lccc.l:13: error: (Each undeclared To negotiate these sorts of problems, flex provides a mechanism for creating and switching between multiple input buffers. weblink YY_NULL : (buf = c, 1); \ } %} This definition will change the input processing to occur one character at a time.
Actions Each pattern in a rule has a corresponding action, which can be any arbitrary C statement. flex generates as output a C source file, `lex.yy.c', which defines a routine `yylex()'. For example, it could be #define'd to call a routine to convert yytext to lower-case.
The pattern ends at the first non-escaped whitespace character; the remainder of the line is its action. We have the GNU m4 binary under /usr/gnu/bin. flex also provides a mechanism for controlling options within the scanner specification itself, rather than from the flex command-line. For example, it could be used to call a routine to read in a data table or open a logging file.
It will be the next character scanned. It will generate a lot of messages to stderr concerning the form of the input and the resultant non-deterministic and deterministic finite automata. The disadvantage is that you are restricted in how your actions can modify yytext (see the next section), and calls to the `unput()' function destroys the present contents of yytext, which check over here This is almost certainly a simple bug in gmp's configure.
The following are illegal: foo/bar$
The default setting is `-Cem', which specifies that flex should generate equivalence classes and meta-equivalence classes. This option lets you easily link together multiple flex programs into the same executable. Still not completely solved. Please, do not forget to reset SIGPIPE when you are invoking GCC with GMP installation from within a Python script.
This is a known problem, see how this guy tried to debug it.