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PATH: usr / share / doc / perl-Parse-RecDescent-1.967009 / demo

#!/usr/bin/perl -ws

# REMOVE COMMENTS FROM C++ CODE

# ORIGINAL BY Helmut Jarausch
# EXTENDED BY Damian Conway AND Helmut Jarausch AND Jeremy Braun

use strict;
use Parse::RecDescent;

use vars qw/ $Grammar /;

my $parser = new Parse::RecDescent $Grammar  or  die "invalid grammar";

undef $/;
my $text = @ARGV ? <> : <DATA>;

$parser->program($text) or die "malformed C program";

print "Comments\n========\n$parser->{comments}\n";
print "\nCode\n====\n$parser->{code}\n";
print "\nStrings\n=======\n", map(qq{\t"$_"\n}, @{$parser->{strings}});

BEGIN
{ $Grammar=<<'EOF';

program	: <skip:''> { @{$thisparser}{qw(comments code strings)} = () }
	  part(s)

part	: comment { $thisparser->{comments} .= $item[1];
        	    $thisparser->{code}     .= " "; }
        | C_code  { $thisparser->{code}     .= $item[1]; }
        | string  { $thisparser->{code}     .= qq("$item[1]");
		    push @{$thisparser->{strings}}, $item[1]; }
        | charlit  { $thisparser->{code}     .= qq('$item[1]');
		    push @{$thisparser->{strings}}, $item[1]; }

C_code  : m{(
	      [^"/]+		# one or more non-delimiters
	      (			# then (optionally)...
	       /		# a potential comment delimiter
	       [^*/]		# which is not an actual delimiter
	      )?		#
	    )+			# all repeated once or more
	   }x

string	: m{"			# a leading delimiter
	    ((			# zero or more...
	      \\.		# escaped anything
	      |			# or
	      [^"]		# anything but a delimiter
	     )*
	    )
	    "}x
		{ $return =  $1 }

charlit	: m{'			# a leading delimiter
	    ((			# zero or more...
	      \\.		# escaped anything
	      |			# or
	      [^']		# anything but a delimiter
	     )*
	    )
	    '}x
		{ $return =  $1 }

comment	: m{\s*			# optional whitespace
	    //			# comment delimiter
	    [^\n]*		# anything except a newline
	    \n			# then a newline
	   }x

| m{\s*			# optional whitespace
	    /\*			# comment opener
	    (?:[^*]+|\*(?!/))*	# anything except */
	    \*/		        # comment closer
            ([ \t]*)?           # trailing blanks or tabs
	   }x

EOF
}
__DATA__
program test; // for decomment

// using Parse::RecDescent

int main()
{
/* this should
   be removed
*/
  char *cp1 = "";
  char *cp2 = "cp2";
  char c3   = 'c';
  int i;  // a counter
          // remove this line altogehter
  int k;
      int more_indented;  // keep indentation
      int l;  /* a loop
             variable */
      // should be completely removed

char *str = "/* ceci n'est pas un commentaire */";
  return 0;
}

[-] demo_cpp.pl [edit]
[-] demo_autorule.pl [edit]
[-] demo_errors.pl [edit]
[-] demo_piecewise.pl [edit]
[-] demo_logic.pl [edit]
[-] demo_skipcomment.pl [edit]
[-] demo_implicit.pl [edit]
[-] demo_separators.pl [edit]
[-] demo_perlparsing.pl [edit]
[-] demo_street.pl [edit]
[-] demo_scoredsep.pl [edit]
[-] demo.c [edit]
[-] demo_textgen.pl [edit]
[-] demo.pl [edit]
[-] demo_calc.pl [edit]
[+] ..
[-] demo_another_Cgrammar.pl [edit]
[-] demo_matchrule2.pl [edit]
[-] demo_mccoy.pl [edit]
[-] demo_restructure_painful.pl [edit]
[-] demo_methods.pl [edit]
[-] demo_language.pl [edit]
[-] demo_selfmod.pl [edit]
[-] demo_OOautoparsetree.pl [edit]
[-] demo_codeblock.pl [edit]
[-] demo_simplequery.pl [edit]
[-] demo_restructure_easy.pl [edit]
[-] demo_tokens.pl [edit]
[-] demo_decomment.pl [edit]
[-] demo_recipe.pl [edit]
[-] demo_delete.pl [edit]
[-] demo_lisplike.pl [edit]
[-] demo_bad.pl [edit]
[-] demo_arithmetic.pl [edit]
[-] demo_leftassoc.pl [edit]
[-] demo_PerlCSV.pl [edit]
[-] demo_metaRD.pm [edit]
[-] demo_derived.pl [edit]
[-] demo_opreps.pl [edit]
[-] demo_matchrule.pl [edit]
[-] demo_LaTeXish_autoact.pl [edit]
[-] demo_operator.pl [edit]
[-] demo_autoscoresep.pl [edit]
[-] demo_Cgrammar_v2.pl [edit]
[-] demo_NL2SQL.pl [edit]
[-] demo_Cgrammar.pl [edit]
[-] demo_randomsentence.pl [edit]
[-] demo_template.pl [edit]
[-] demo_quicklist.pl [edit]
[-] demo_itemhash.pl [edit]
[-] demo_buildcalc.pl [edit]
[-] demo_leftop.pl [edit]
[-] demo_decomment_nonlocal.pl [edit]
[-] demo_dot.pl [edit]
[-] demo_LaTeXish.pl [edit]
[-] demo_precalc.pl [edit]
[-] demo_eval.pl [edit]
[-] demo_autostub.pl [edit]
[-] demo_whoson.pl [edit]
[-] demo_lexer.pl [edit]
[-] demo_OOparsetree.pl [edit]
[-] demo_parsetree.pl [edit]
[-] demo_simple.pl [edit]
[-] demo_embedding.pl [edit]
[-] demo_simpleXML.pl [edit]
[-] demo_undumper.pl [edit]