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#!/usr/bin/perl
#   ngspice2genspic - Copyright 2004 Ian Jackson - see below
#
# Reads the output from ngspice and outputs a `genspic' file
# for use with genspic2gnuplot.  Takes no arguments or options.
#
# Limitations
#
#  Only frequency (.AC) and transient plots have been tested.
#
#  Displaying voltages and currents on the same .TRAN graph won't work
#   well because they currently have to have the same Y scale.
#
#  This whole scheme is very clumsy.  There should be a driver program
#  with command-line option parsing.

# This program and its documentation are free software; you can
# redistribute them and/or modify them under the terms of the GNU
# General Public License as published by the Free Software Foundation;
# either version 3, or (at your option) any later version.
# 
# This program and its documentation are distributed in the hope that
# they will be useful, but WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
# PURPOSE.  See the GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License along
# with this program; if not, consult the Free Software Foundation's
# website at www.fsf.org, or the GNU Project website at www.gnu.org.

die if @ARGV;

while (<STDIN>) {
    if (m/^Total CPU/) {
	die if $mode ne '';
	$seentcpu=1;
    } elsif (m/^Current dynamic memory/ ||
	     m/^Dynamic memory limit/ ||
	     m/^Level not specified/ ||
	     m/^Doing analysis/ ||
	     m/^CPU time since/ ||
	     m/^Circuit\:/) {
	die if length $mode;
    } elsif (m/\f/) {
	die if m/\S/;
    } elsif (!m/\S/ && $mode eq InitTransSkip) {
	$mode= '';
    } elsif (m/^Initial Transient/ && $mode eq '') {
	$mode= InitTrans;
    } elsif (m/^Node/ && $mode eq InitTrans) {
	$mode= InitTransSkip;
    } elsif (m/\w/ && $mode eq InitTransSkip) {
    } elsif (m/^\-\-/ && length $mode) {
    } elsif (m/^\s\s+(\w+) Analysis /) {
	if ($mode eq '') {
	    $mode= Table;
	    $ctable= $1;
	    $dokey= 1;
	} else {
	    $dokey= 0;
	}
    } elsif (m/^\s\s+/ && ($mode eq Table or !length $mode)) {
    } elsif (m/^Index / && $mode eq Table) {
	s/\s+$//;
	($index,$key,@nowheadings) = split /\s+/, $_;
	$logxy= 0+($key eq 'frequency');
    } elsif (m/^\d+\s/ && $mode eq Table) {
	($index,$key,@nowcolumns) = split /\s+/, $_;
	shift @nowcolumns if $key =~ s/\,$//;
	$coldata[$index] .= " $key" if $dokey;
	$coldata[$index] .= " @nowcolumns";
	if (!$index) {
	    foreach $c (@nowheadings) {
		$h= 'y';
		$h= 'y2' if $c =~ m/^ph\(/;
		push @columns, "$h:$c";
	    }
	}
    } elsif (!m/\S/ && $mode eq Table) {
	print "S $ctable $logxy @columns\n" or die $!;
	foreach $l (@coldata) { printf "D%s\n", $l or die $!; }
	print "T\n" or die $!;
	$mode= '';
	@columns= ();
	@coldata= ();
    } elsif (!m/\S/) {
	$mode= '' if $mode eq InitTransSkip;
    } else {
	die "$mode: $_ ?";
    }
}
die "no plots" unless defined $ctable;
print "F\n" or die $!;

# $Id: ngspice2genspic,v 1.3 2007-09-21 21:21:15 ianmdlvl Exp $