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package Parser;
# ************************************************************
# Description : A basic parser that requires a parse_line override
# Author : Chad Elliott
# Create Date : 5/16/2002
# ************************************************************
# ************************************************************
# Pragmas
# ************************************************************
use strict;
use FileHandle;
use OutputMessage;
use StringProcessor;
use DirectoryManager;
use vars qw(@ISA);
@ISA = qw(OutputMessage StringProcessor DirectoryManager);
# ************************************************************
# Data Section
# ************************************************************
my %filecache;
# ************************************************************
# Subroutine Section
# ************************************************************
sub new {
my($class, $inc) = @_;
my $self = $class->SUPER::new();
## Set up the internal data members.
$self->{'line_number'} = 0;
$self->{'include'} = $inc;
return $self;
}
sub strip_line {
my($self, $line) = @_;
## Keep track of our line number
++$self->{'line_number'};
## Remove comments and leading and trailing white-space.
$line =~ s/\/\/.*//;
$line =~ s/^\s+//;
$line =~ s/\s+$//;
return $line;
}
sub preprocess_line {
#my $self = shift;
#my $fh = shift;
#my $line = shift;
return $_[0]->strip_line($_[2]);
}
sub read_file {
my($self, $input, $cache) = @_;
my $ih = new FileHandle();
my $status = 1;
my $errorString;
$self->{'line_number'} = 0;
if (open($ih, $input)) {
$self->debug("Open $input");
if ($cache) {
## If we don't have an array for this file, then start one
$filecache{$input} = [] if (!defined $filecache{$input});
while(<$ih>) {
## Preprocess the line
my $line = $self->preprocess_line($ih, $_);
## Push the line onto the array for this file
push(@{$filecache{$input}}, $line);
## Parse the line
($status, $errorString) = $self->parse_line($ih, $line);
## Stop reading the file if we've encountered an error
last if (!$status);
}
}
else {
## We're not caching, so we just preprocess and parse in one call.
while(<$ih>) {
($status, $errorString) = $self->parse_line(
$ih, $self->preprocess_line($ih, $_));
## Stop reading the file if we've encountered an error
last if (!$status);
}
}
$self->debug("Close $input");
close($ih);
}
else {
$errorString = "Unable to open \"$input\" for reading";
$status = 0;
}
return $status, $errorString;
}
sub cached_file_read {
my($self, $input) = @_;
my $lines = $filecache{$input};
if (defined $lines) {
my $status = 1;
my $error;
$self->{'line_number'} = 0;
foreach my $line (@$lines) {
++$self->{'line_number'};
## Since we're "reading" a cached file, we must pass undef as the
## file handle to parse_line().
($status, $error) = $self->parse_line(undef, $line);
## Stop "reading" the file if we've encountered an error
last if (!$status);
}
return $status, $error;
}
## We haven't cached this file yet, read it and cache it.
return $self->read_file($input, 1);
}
sub get_line_number {
return $_[0]->{'line_number'};
}
sub set_line_number {
my($self, $number) = @_;
$self->{'line_number'} = $number;
}
sub slash_to_backslash {
## This method is here solely for convenience. It's used to make the
## calling code look cleaner.
my($self, $file) = @_;
$file =~ s/\//\\/g;
return $file;
}
sub get_include_path {
return $_[0]->{'include'};
}
sub search_include_path {
my($self, $file) = @_;
foreach my $include ('.', @{$self->{'include'}}) {
return "$include/$file" if (-r "$include/$file");
}
return undef;
}
sub escape_regex_special {
my($self, $name) = @_;
$name =~ s/([\+\-\\\$\[\]\(\)\.])/\\$1/g;
return $name;
}
# ************************************************************
# Virtual Methods To Be Overridden
# ************************************************************
sub parse_line {
#my $self = shift;
#my $ih = shift;
#my $line = shift;
}
1;
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