How can I skip some block content while reading in Perl.
- by Nano HE
Hello.
I plan to skip the block content which include the start line of "MaterializeU4()" with the subroutin() read_block below. But failed.
# Read a constant definition block from a file handle.
# void return when there is no data left in the file.
# Otherwise return an array ref containing lines to in the block.
sub read_block {
my $fh = shift;
my @lines;
my $block_started = 0;
while( my $line = <$fh> ) {
# how to correct my code below? I don't need the 2nd block content.
$block_started++ if ( ($line =~ /^(status)/) && (index($line, "MaterializeU4") != 0) ) ;
if( $block_started ) {
last if $line =~ /^\s*$/;
push @lines, $line;
}
}
return \@lines if @lines;
return;
}
Data as below:
__DATA__
status DynTest = <dynamic 100>
vid = 10002
name = "DynTest"
units = ""
status VIDNAME9000 = <U4 MaterializeU4()>
vid = 9000
name = "VIDNAME9000"
units = "degC"
status DynTest = <U1 100>
vid = 100
name = "Hello"
units = ""
Output:
<StatusVariables>
<SVID logicalName="DynTest" type="L" value="100" vid="10002" name="DynTest" units=""></SVID>
<SVID logicalName="VIDNAME9000" type="L" value="MaterializeU4()" vid="9000" name="VIDNAME9000" units="degC"></SVID>
<SVID logicalName="DynTest" type="L" value="100" vid="100" name="Hello" units=""></SVID>
</StatusVariables>
[Updated]
I print the value of index($line, "MaterializeU4"), it output 25.
Then I updated the code as below
$block_started++ if ( ($line =~ /^(status)/) && (index($line, "MaterializeU4") != 25)
Now it works.
Any comments are welcome about my practice.
Thank you.
