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Annotation of 43BSDReno/old/lex/lex.1, revision 1.1.1.1

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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