paste.chapril.org-privatebin/compress/remove_constants.pl
2010-05-26 15:34:42 -07:00

70 lines
1.8 KiB
Perl
Executable File

#!/usr/bin/env perl
# This script is a hack. It identifies things which it believes to be
# constant, then replaces them throughout the code.
#
# Constants are identified as properties declared in object notation
# with values consisting only of capital letters and underscores. If
# the first character is an underscore, the constant is private, and
# can be removed entirely.
#
# The script dies if any two constants have the same property name but
# different values.
my $script = join '', <>;
# remove comments
$script =~ s=/\*([^\*]|\*+[^\/])*\*/==g;
$script =~ s=//.*==g;
sub preserve {
my $stuff = shift;
$stuff =~ s/,//;
return $stuff;
}
my %constants = ();
sub add_constant {
my ($name, $value) = @_;
if (defined $constants{$name} && $constants{$name} ne $value) {
print STDERR "variant constant $name = $value";
die;
} else {
$constants{$name} = $value;
#print STDERR "constant: $name = $value\n";
}
}
# find private constants
while ($script =~
s/([,\{]) \s* # indicator that this is part of an object
(_[A-Z0-9_]+) \s* : \s* # all-caps variable name beginning with _
(\d+|0x[0-9A-Fa-f]+) \s* # numeric value
([,\}]) # next part of object
/preserve "$1$4"/ex) {
add_constant $2, $3;
}
my $script2 = '';
# find public constants
while ($script =~
s/^(.*?) # beginning of script
([,\{]) \s* # indicator that this is part of an object
([A-Z0-9_]+) \s* : \s* # all-caps variable name
(\d+|0x[0-9A-Fa-f]+) \s* # numeric value
([,\}]) # next part of object([,\{]) \s*
/$5/esx) {
$script2 .= "$1$2$3:$4";
add_constant $3, $4;
}
$script = "$script2$script";
foreach (keys %constants) {
my $value = $constants{$_};
$script =~ s/(?:[a-zA-Z0-9_]+\.)+$_(?=[^a-zA-Z0-9_])/$value/g;
}
print $script;