<%doc>

 This is part of the YARRG website.  YARRG is a tool and website
 for assisting players of Yohoho Puzzle Pirates.

 Copyright (C) 2009 Ian Jackson <ijackson@chiark.greenend.org.uk>
 Copyright (C) 2009 Clare Boothby

  YARRG's client code etc. is covered by the ordinary GNU GPL (v3 or later).
  The YARRG website is covered by the GNU Affero GPL v3 or later, which
   basically means that every installation of the website will let you
   download the source.

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as
 published by the Free Software Foundation, either version 3 of the
 License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Affero General Public License for more details.

 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.

 Yohoho and Puzzle Pirates are probably trademarks of Three Rings and
 are used without permission.  This program is not endorsed or
 sponsored by Three Rings.


 This Mason component simply defines how to interpret capacities.

</%doc>

<%attr>
maxambig => 2
abbrev_initials => 1
</%attr>

<%method preparse>
<%args>
$h
</%args>
<%perl>

my $parse_numeric= sub {
	# returns (mass,volume,emsg)
	my ($string,$default)= @_;

	my @mve= (undef,undef,undef);

	if ($string !~ m/\d/) {
		return (undef,undef,
			'Adjustments to capacity must contain digits.');
	}

	my $def= sub {
		my ($ix,$what,$val) = @_;
		if (defined $h->{$what}) {
			$mve[2]= "\`$string' specifies $what more than once.";
		}
		print STDERR "SET $what $val\n";
		$mve[$ix]= $val;
	};

print STDERR "PAN \`$string'\n";
	local $_;
	foreach $_ (split /\s+/, $string) {
		print STDERR "ITEM \`$_'\n";
		next unless length;
		if (m/^([1-9]\d{0,8})l$/) {
			$def->(1, 'volume', $1);
		} elsif (m/^([1-9]\d{0,8})kg$/) {
			$def->(0, 'mass', $1);
		} elsif (m/^([1-9]\d{0,5}(?:\.\d{0,3})?)kl/) {
			$def->(1, 'volume', $1 * 1000);
		} elsif (m/^([1-9]\d{0,5}(?:\.\d{0,3})?)t/) {
			$def->(0, 'mass', $1 * 1000);
		} else {
			$mve[2]= "Cannot understand item \`$_'".
				" in numeric capacity";
		}
	}
#	foreach my $ix (qw(0 1)) {
#		$mve[$ix]= $default unless defined $mve[$ix];
#	}
	return @mve;
};

my @mv_names= qw(mass volume);
my $canon_numeric= $h->{'canon_numeric'}= sub {
	print STDERR "CANNUM @_\n";
	my $sep= '';
	my $out= '';
	foreach my $ix (qw(0 1)) {
		next unless defined $_[$ix];
		$out .= $sep; $sep= ' ';
		$out .= sprintf "%g%s", $_[$ix], (qw(kg l))[$ix];
	}
	return $out;
};

$h->{'deltas'}= [ ];
print STDERR "NDELTA0 $#{ $h->{'deltas'} }\n";

local ($_)= ${ $h->{String} };
while (m/^(.*)(\bminus\b|-|\bplus\b|\+)/) {
	my ($lhs,$rhs)= ($1,$');
	print STDERR "TERM L=\`$1' M=\`$2' R=\`$''\n";
	my ($signum,$signopstr)= 
		$2 =~ m/^p|^\+/ ? (+1,'plus') : (-1,'minus');
	my @mveco;
	if ($rhs =~ m/^\s*(\d{1,2}(?:\.\d{0,4})?)\%\s*$/) {
		my $pct= 100.0 + $signum * $1;
		@mveco= ($pct,$pct,undef);
		push @mveco, sprintf "%s %g%%", $signopstr, $1;
		push @mveco, sub {
			return undef unless defined $_[0];
			$_[0] * $_[1] / 100.0
		};
	} else {
		@mveco= $parse_numeric->($rhs, 0);
		if (!defined $mveco[2]) {
			push @mveco, $signopstr.' '.$canon_numeric->(@mveco);
			push @mveco, sub {
				${ $h->{Emsg} }= "Cannot add or subtract".
					" mass to/from volume"
					unless defined $_[0];
				$_[0] + $_[1] * $signum
			};
		}
	}
	${ $h->{Emsg} }= $mveco[2] if defined $mveco[2];
	unshift @{ $h->{'deltas'} }, [ @mveco ];
	print STDERR "NDELTA $#{ $h->{'deltas'} }\n";
	$_= $lhs;
}

s/^\s+//; s/\s+$//;

if (m/^[a-z ]+$/) {
	push @{ $h->{Specs} }, $_;
} elsif (m/\d/) {
	my (@mve)= $parse_numeric->($_, undef);
	if (defined $mve[2]) { ${ $h->{Emsg} }= $mve[2]; return; }
	$h->{'initial'}= \@mve;
} elsif (m/\S/) {
	${ $h->{Emsg} }= "Cannot understand capacity specification \`$_'.";
} else {
	$h->{'initial'}= [undef,undef];
}

</%perl>
</%method>

<%method sqlstmt>
SELECT name,mass,volume
	FROM vessels WHERE name LIKE ?
</%method>

<%method nomatch>
  Did not understand ship name.
</%method>

<%method ambiguous>
  Ambiguous - could be <% $ARGS{couldbe} |h %>
</%method>

<%method manyambig>
  Too many matching ship types.
</%method>

<%method postquery>
<%args>
$h
</%args>
<%perl>

my $canon_numeric= $h->{'canon_numeric'};

return if length ${ $h->{Emsg} };

my @mv;
my @mv_names= qw(mass volume);
if (@{ $h->{Specs} }) {
	@mv= @{ $h->{Results}[0] }[1,2];
} else {
	@mv= @{ $h->{'initial'} };
	${ $h->{Canon} }= $canon_numeric->(@mv);
}
print STDERR "INITIAL @mv\n";

print STDERR "NDELTAE $#{ $h->{'deltas'} }\n";
foreach my $delta (@{ $h->{'deltas'} }) {
	print STDERR "DELTA @$delta\n";
	die if defined $delta->[2]; # emsg
	foreach my $ix (qw(0 1)) {
		next unless defined $delta->[$ix];
		print STDERR "DELTA I $ix\n";
		$mv[$ix] = $delta->[4]->($mv[$ix], $delta->[$ix]);
		return if length ${ $h->{Emsg} };
	}
	${ $h->{Canon} }.= ' '.$delta->[3];
}

if (@{ $h->{Specs} } || @{ $h->{'deltas'} }) {
	${ $h->{Canon} }.= "  [= ". $canon_numeric->(@mv). "]";
}

foreach my $ix (qw(0 1)) {
	next unless defined $mv[$ix];
	next if $mv[$ix] >= 0;
	${ $h->{Emsg} }= sprintf "%s limit is negative: %s",
		ucfirst($mv_names[$ix]), $canon_numeric->(@mv);
	return;
}

@{ $h->{Results} }= [ @mv ];

</%perl>
</%method>