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Mok takes its name from Ookla the Mok, an unforgettable character from the
animated TV series "Thundarr the Barbarian", and from shortening "molecular
awk".  For more details about the Mok mini-language, see LANGUAGE SPECIFICATION
below.

Mok is part of the PerlMol project, L<http://www.perlmol.org>.

=head1 OPTIONS

=over

=item -3

Generate 3D coordinates using Chemistry::3DBuilder.

=item -a          

"Aromatize" each molecule as it is read. This is needed for example for
matching SMARTS patterns that use aromaticity or ring primitives.

=item -b

Find bonds. Use it when reading files with no bond information but 3D
coordinates to detect the bonds if needed (for example, if you want to do match
a pattern that includes bonds). If the file has explicit bonds, mok will not
try to find the bonds, but it will reassign the bond orders from scratch.

=item -c CLASS

Use CLASS instead of Chemistry::Mol to read molecules

=item -d

Delete dummy atoms after reading each molecule. A dummy atom is defined as an
atom with an unknown symbol (i.e., it doesn't appear on the periodic table), or
an atomic number of zero.

=item -D

Print debugging information, such as the way the input program was tokenized
and parsed into blocks and subs. This may be useful for diagnosing syntax
errors when the default error mesage is not informative enough.

=item -f FILE

Run the code from FILE instead of the command line

=item -h  

Print usage information and exit

=item -p TYPE     

Parse patterns using the specified TYPE. Default: 'smarts'. Other options are
'smiles' and 'midas'.

=item -t TYPE     

Assume that every file has the specified TYPE. Available types depend on
which Chemistry::File modules are installed, but currently available types
include mdl, sdf, smiles, formula, mopac, pdb.

=back

=head1 LANGUAGE SPECIFICATION

A Mok script consists of a sequence of pattern-action statements and
optional subroutine definitions, in a manner very similar to the AWK
language.

    pattern_type:/pattern/options { action statements }
    { action statements }
    sub name { statements }
    BEGIN { statements }
    END { statements }
    # comment

When the whole program consists of one unconditional action block, the braces
may be omitted.

Program execution is as follows:

1) The BEGIN block is executed as soon as it's compiled, before any other
actions are taken.

2) For each molecule in the files given in the command line, each pattern is 
applied in turn; if the pattern matches, the corresponding statement block
is executed. The pattern is optional; statement blocks without a pattern are
executed unconditionally. Subroutines are only executed when called explicitly.

3) Finally, the END block is executed.

The statements are evaluated as Perl statements in the
Chemistry::Mok::UserCode::Default package. The following chemistry modules are
conveniently loaded by default:

    Chemistry::Mol;
    Chemistry::Atom ':all';
    Chemistry::Bond;
    Chemistry::Pattern;
    Chemistry::Pattern::Atom;
    Chemistry::Pattern::Bond;
    Chemistry::File;
    Chemistry::File::*;
    Math::VectorReal ':all';

Besides these, there is one more function available for convenience:
C<println>, which is defined by C<sub println { print "\@_", "\n" }>.

=head2 Pattern Specification

The pattern must be a SMARTS string readable by the Chemistry::File::SMARTS
module, unless a different type is specified by means of the -p option or a
pattern_type is given explicitly before the pattern itself. The pattern is
given within slashes, in a way reminiscent of AWK and Perl regular expressions.
As in Perl, certain one-letter options may be included after the closing slash.
An option is turned on by giving the corresponing lowercase letter and turned
off by giving the corresponding uppercase letter.

=over

mok  view on Meta::CPAN

The current filename.

=item $MOL

A reference to the current molecule as a Chemistry::Mol object.

=item $MATCH

A reference to the current match as a Chemistry::Pattern object.

=item $PATT

The current pattern as a string.

=item $FH

The current input filehandle. This provides low-level access in case you want
to rewind or seek into the file, tell the current position, etc. Playing with
$FH may break things if you are not careful. Use at your own risk!

=item @A

The atoms that were matched. It is defined as @A = $MATCH->atom_map if a
pattern was used, or @A = $MOL->atoms within an unconditional block.  Remember
that this is a Perl array, so it is zero-based, unlike the one-based numbering
used by most file types and some PerlMol methods.

=item @B

The bonds that were matched. It is defined as @A = $MATCH->bond_map if a
pattern was used, or @A = $MOL->bonds within an unconditional block.  Remember
Remember that this is a Perl array, so it is zero-based, unlike the one-based
numbering used by most file types and some PerlMol methods.

=back

=head2 Special Blocks

Within action blocks, the following block names can be used with Perl 
funcions such as C<next> and C<last>:

=over

=item MATCH

=item BLOCK

=item MOL

=item FILE

=back

=head1 EXAMPLES

Print the names of all the molecules found in all the .sdf files in the 
current directory:

    mok 'println $MOL->name' *.sdf

Find esters among *.mol; print the filename, molecule name, and formula:

    mok '/C(=O)OC/{ printf "$FILE: %s (%s)\n", 
        $MOL->name, $MOL->formula }' *.mol

Find out the total number of atoms:

    mok '{ $n += $MOL->atoms } END { print "Total: $n atoms\n" }' *.mol

Find out the average C-S bond length:

    mok '/CS/g{ $n++; $len += $B[0]->length }
        END { printf "Average C-S bond length: %.3f\n", $len/$n; }' *.mol

Convert PDB files to MDL molfiles:

    mok '{ $FILE =~ s/pdb/mol/; $MOL->write($FILE, format => "mdlmol") }' *.pdb

Find molecules with a given formula by overriding the formula pattern type
globally (this example requires L<Chemistry::FormulatPattern>):

    mok -p formula_pattern '/C6H12O6/{ println $MOL->name }' *.sdf

Find molecules with a given formula by overriding the formula pattern type
just for one specific pattern. This can be used when more than one pattern
type is needed in one script.

    mok 'formula_pattern:/C6H12O6/{ println $MOL->name }' *.sdf


=head1 SEE ALSO

awk(1), perl(1)
L<Chemistry::Mok>,
L<Chemistry::Mol>, L<Chemistry::Pattern>,
L<http://dmoz.org/Arts/Animation/Cartoons/Titles/T/Thundarr_the_Barbarian/>.

Tubert-Brohman, I. Perl and Chemistry. The Perl Journal 2004-06 
(L<http://www.tpj.com/documents/s=7618/tpj0406/>).

The PerlMol project site at L<http://www.perlmol.org>.

=head1 VERSION

0.25

=head1 AUTHOR

Ivan Tubert-Brohman E<lt>itub@cpan.orgE<gt>

=head1 COPYRIGHT

Copyright (c) 2005 Ivan Tubert-Brohman. All rights reserved. This program is
free software; you can redistribute it and/or modify it under the same terms as
Perl itself.

=cut