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package CParse::String;
use 5.6.0;
use strict;
use warnings;
use Exporter;
our @ISA = qw/Exporter/;
our @EXPORT_OK = qw/escape unescape/;
sub escape
{
my $str = shift;
$str =~ s/\\/\\\\/g;
$str =~ s/\'/\\'/g;
$str =~ s/\"/\\"/g;
$str =~ s/\?/\\?/g;
$str =~ s/\a/\\a/g;
$str =~ s/\0x08/\\b/g;
$str =~ s/\f/\\f/g;
$str =~ s/\n/\\n/g;
$str =~ s/\r/\\r/g;
$str =~ s/\t/\\t/g;
$str =~ s/\0x0b/\\v/g;
$str =~ s/([^[:print:]])/sprintf "\\x%x", ord($1)/ge;
return $str;
}
sub unescape
{
my $str = shift;
my $out = "";
while (length $str)
{
my $c = substr($str, 0, 1, '');
if ($c eq '\\')
{
$c = substr($str, 0, 1, '');
unless (defined $c)
{
die "Bad escape sequence\n";
}
if ($c eq '\\')
{
$out .= '\\';
}
elsif ($c eq '\'')
{
$out .= '\'';
}
elsif ($c eq '"')
{
$out .= '"';
}
elsif ($c eq '?')
{
$out .= '?';
}
elsif ($c eq 'a')
{
$out .= "\a";
}
elsif ($c eq 'b')
{
$out .= "\0x08";
}
elsif ($c eq 'f')
{
$out .= "\f";
}
elsif ($c eq 'n')
{
$out .= "\n";
}
elsif ($c eq 'r')
{
$out .= "\r";
}
elsif ($c eq 't')
{
$out .= "\t";
}
elsif ($c eq 'v')
{
$out .= "\0x0b";
}
elsif ($c eq 'x')
{
$str =~ s/^([[:xdigit:]]+)//;
$out .= chr(hex($1));
}
elsif ($c =~ /^[0-7]$/)
{
$str =~ s/^([0-7]{0,2})//;
$out .= chr(oct($c . $1));
}
}
else
{
$out .= $c;
}
}
return $out;
}
sub new
{
my $this = shift;
my $class = ref($this) || $this;
my $str = shift;
my $wide = shift;
my $self = {value => $str,
wide => $wide,
};
bless $self, $class;
return $self;
}
sub dump_c
{
my $self = shift;
my $value = escape($self->{value});
return $self->{wide} ? "L\"$value\"" : "\"$value\"";
}
1;
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