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Annotation of 43BSDTahoe/man/man1/lex.1, revision 1.1

1.1     ! root        1: .\"    @(#)lex.1       6.2 (Berkeley) 4/14/86
        !             2: .\"
        !             3: .TH LEX 1 "April 14, 1986"
        !             4: .AT 3
        !             5: .SH NAME
        !             6: lex \- generator of lexical analysis programs
        !             7: .SH SYNOPSIS
        !             8: .B lex
        !             9: [
        !            10: .B \-tvfn
        !            11: ] [ file ] ...
        !            12: .SH DESCRIPTION
        !            13: .I Lex
        !            14: generates programs to be used in simple lexical analyis of text.
        !            15: The input
        !            16: .I files
        !            17: (standard input default) contain regular expressions
        !            18: to be searched for, and actions written in C to be executed when
        !            19: expressions are found.
        !            20: .PP
        !            21: A C source program, 'lex.yy.c' is generated, to be compiled thus:
        !            22: .IP
        !            23: cc lex.yy.c \-ll
        !            24: .LP
        !            25: This program, when run, copies unrecognized portions of
        !            26: the input to the output, and executes the associated
        !            27: C action for each regular expression that is recognized.
        !            28: .PP
        !            29: The options have the following meanings.
        !            30: .TP
        !            31: .B \-t
        !            32: Place the result on the standard output instead of in file "lex.yy.c".
        !            33: .TP
        !            34: .B \-v
        !            35: Print a one-line summary of statistics of the generated analyzer.
        !            36: .TP
        !            37: .B \-n
        !            38: Opposite of
        !            39: .BR \-v ;
        !            40: .B \-n
        !            41: is default.
        !            42: .TP
        !            43: .B \-f
        !            44: "Faster" compilation: don't bother to pack
        !            45: the resulting tables; limited to small programs.
        !            46: .SH EXAMPLE
        !            47: .IP
        !            48: lex lexcommands
        !            49: .PP
        !            50: would draw
        !            51: .I lex
        !            52: instructions from the file
        !            53: .I lexcommands,
        !            54: and place the output in
        !            55: .I lex.yy.c
        !            56: .IP ""
        !            57: .nf
        !            58: .ta \w'[A\-Z] 'u
        !            59: %%
        !            60: [A\-Z] putchar(yytext[0]+\'a\'\-\'A\');
        !            61: [ ]+$  ;
        !            62: [ ]+   putchar(\' \');
        !            63: .fi
        !            64: .PP
        !            65: is an example of a
        !            66: .I lex
        !            67: program that would be put into a
        !            68: .I lex
        !            69: command file.  This program converts upper case to lower,
        !            70: removes blanks at the end of lines,
        !            71: and replaces multiple blanks by single blanks.
        !            72: .SH "SEE ALSO"
        !            73: yacc(1), sed(1)
        !            74: .br
        !            75: M. E. Lesk and E. Schmidt,
        !            76: .I LEX \- Lexical Analyzer Generator

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