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Top Forums Programming parsing fixed length field with yacc/bison Post 302280645 by otheus on Tuesday 27th of January 2009 10:27:43 AM
Old 01-27-2009
Generally, you don't specify token lengths.... yacc sees tokens, not strings. F/Lex sees strings and outputs tokens. So if you want tokens of specified length, do (in flex):
Code:
[a-zA-Z0-9_][a-zA-Z0-9_][a-zA-Z0-9_]    AlphaNumericSpecialOfLength3

(Pardon, but I forgot actual flex syntax)
 

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XTOKID(1)							   User Commands							 XTOKID(1)

NAME
xtokid - Print all tokens found in a source file SYNOPSIS
xtokid [OPTION]... [FILE]... DESCRIPTION
Print all tokens found in a source file. -i, --include=LANGS include languages in LANGS (default: "C C++ asm") -x, --exclude=LANGS exclude languages in LANGS -l, --lang-option=L:OPT pass OPT as a default for language L (see below) -m, --lang-map=MAPFILE use MAPFILE to map file names onto source language -d, --default-lang=LANG make LANG the default source language -p, --prune=NAMES exclude the named files and/or directories --files0-from=F tokenize only the files specified by NUL-terminated names in file F --help display this help and exit --version output version information and exit The following arguments apply to the language-specific scanners: C language: -k,--keep=CHARS Allow CHARS in single-token strings, keep the result -i,--ignore=CHARS Allow CHARS in single-token strings, toss the result -u,--strip-underscore Strip a leading underscore from single-token strings C++ language: -k,--keep=CHARS Allow CHARS in single-token strings, keep the result -i,--ignore=CHARS Allow CHARS in single-token strings, toss the result -u,--strip-underscore Strip a leading underscore from single-token strings Java language: -k,--keep=CHARS Allow CHARS in single-token strings, keep the result -i,--ignore=CHARS Allow CHARS in single-token strings, toss the result -u,--strip-underscore Strip a leading underscore from single-token strings Assembly language: -c,--comment=CHARS Any of CHARS starts a comment until end-of-line -k,--keep=CHARS Allow CHARS in tokens, and keep the result -i,--ignore=CHARS Allow CHARS in tokens, and toss the result -u,--strip-underscore Strip a leading underscore from tokens -n,--no-cpp Don't handle C pre-processor directives Text language: -i,--include=CHAR-CLASS Treat characters of CHAR-CLASS as token constituents -x,--exclude=CHAR-CLASS Treat characters of CHAR-CLASS as token delimiters Perl language: -i,--include=CHAR-CLASS Treat characters of CHAR-CLASS as token constituents -x,--exclude=CHAR-CLASS Treat characters of CHAR-CLASS as token delimiters -d,--dtags Include documentation tags Lisp language: REPORTING BUGS
Report bugs to bug-idutils@gnu.org xtokid - 4.5 August 2012 XTOKID(1)
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