/usr/share/perl5/FCM1/Build/Fortran.pm is in fcm 2016.12.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# (C) British Crown Copyright 2006-16 Met Office.
#
# This file is part of FCM, tools for managing and building source code.
#
# FCM is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# FCM 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with FCM. If not, see <http://www.gnu.org/licenses/>.
# ------------------------------------------------------------------------------
use strict;
use warnings;
# ------------------------------------------------------------------------------
package FCM1::Build::Fortran;
use Text::Balanced qw{extract_bracketed extract_delimited};
# Actions of this class
my %ACTION_OF = (extract_interface => \&_extract_interface);
# Regular expressions
# Matches a variable attribute
my $RE_ATTR = qr{
allocatable|dimension|external|intent|optional|parameter|pointer|save|target
}imsx;
# Matches a name
my $RE_NAME = qr{[A-Za-z]\w*}imsx;
# Matches a specification type
my $RE_SPEC = qr{
character|complex|double\s*precision|integer|logical|real|type
}imsx;
# Matches the identifier of a program unit that does not have arguments
my $RE_UNIT_BASE = qr{block\s*data|module|program}imsx;
# Matches the identifier of a program unit that has arguments
my $RE_UNIT_CALL = qr{function|subroutine}imsx;
# Matches the identifier of any program unit
my $RE_UNIT = qr{$RE_UNIT_BASE|$RE_UNIT_CALL}msx;
my %RE = (
# A comment line
COMMENT => qr{\A\s*(?:!|\z)}msx,
# A trailing comment, capture the expression before the comment
COMMENT_END => qr{\A([^'"]*?)\s*!.*\z}msx,
# A contination marker, capture the expression before the marker
CONT => qr{\A(.*)&\s*\z}msx,
# A contination marker at the beginning of a line, capture the marker and
# the expression after the marker
CONT_LEAD => qr{\A(\s*&)(.*)\z}msx,
# Capture a variable identifier, removing any type component expression
NAME_COMP => qr{\b($RE_NAME)(?:\s*\%\s*$RE_NAME)*\b}msx,
# Matches the first identifier in a line
NAME_LEAD => qr{\A\s*$RE_NAME\s*}msx,
# Captures a name identifier after a comma, and the expression after
NAME_LIST => qr{\A(?:.*?)\s*,\s*($RE_NAME)\b(.*)\z}msx,
# Captures the next quote character
QUOTE => qr{\A[^'"]*(['"])}msx,
# Matches an attribute declaration
TYPE_ATTR => qr{\A\s*($RE_ATTR)\b}msx,
# Matches a type declaration
TYPE_SPEC => qr{\A\s*($RE_SPEC)\b}msx,
# Captures the expression after one or more program unit attributes
UNIT_ATTR => qr{\A\s*(?:(?:elemental|recursive|pure)\s+)+(.*)\z}imsx,
# Captures the identifier and the symbol of a program unit with no arguments
UNIT_BASE => qr{\A\s*($RE_UNIT_BASE)\s+($RE_NAME)\s*\z}imsx,
# Captures the identifier and the symbol of a program unit with arguments
UNIT_CALL => qr{\A\s*($RE_UNIT_CALL)\s+($RE_NAME)\b}imsx,
# Captures the end of a program unit, its identifier and its symbol
UNIT_END => qr{\A\s*(end)(?:\s+($RE_NAME)(?:\s+($RE_NAME))?)?\s*\z}imsx,
# Captures the expression after a program unit type specification
UNIT_SPEC => qr{\A\s*$RE_SPEC\b(.*)\z}imsx,
);
# Keywords in type declaration statements
my %TYPE_DECL_KEYWORD_SET = map { ($_, 1) } qw{
allocatable
dimension
in
inout
intent
kind
len
optional
out
parameter
pointer
save
target
};
# Creates and returns an instance of this class.
sub new {
my ($class) = @_;
bless(
sub {
my $key = shift();
if (!exists($ACTION_OF{$key})) {
return;
}
$ACTION_OF{$key}->(@_);
},
$class,
);
}
# Methods.
for my $key (keys(%ACTION_OF)) {
no strict qw{refs};
*{$key} = sub { my $self = shift(); $self->($key, @_) };
}
# Extracts the calling interfaces of top level subroutines and functions from
# the $handle for reading Fortran sources.
sub _extract_interface {
my ($handle) = @_;
map { _present_line($_) } @{_reduce_to_interface(_load($handle))};
}
# Reads $handle for the next Fortran statement, handling continuations.
sub _load {
my ($handle) = @_;
my $ctx = {signature_token_set_of => {}, statements => []};
my $state = {
in_contains => undef, # in a "contains" section of a program unit
in_interface => undef, # in an "interface" block
in_quote => undef, # in a multi-line quote
stack => [], # program unit stack
};
my $NEW_STATEMENT = sub {
{ name => q{}, # statement name, e.g. function, integer, ...
lines => [], # original lines in the statement
line_number => 0, # line number (start) in the original source
symbol => q{}, # name of a program unit (signature, end)
type => q{}, # e.g. signature, use, type, attr, end
value => q{}, # the actual value of the statement
};
};
my $statement;
LINE:
while (my $line = readline($handle)) {
if (!defined($statement)) {
$statement = $NEW_STATEMENT->();
}
my $value = $line;
chomp($value);
# Pre-processor directives and continuation
if (!$statement->{line_number} && index($value, '#') == 0) {
$statement->{line_number} = $.;
$statement->{name} = 'cpp';
}
if ($statement->{name} eq 'cpp') {
push(@{$statement->{lines}}, $line);
$statement->{value} .= $value;
if (rindex($value, '\\') != length($value) - 1) {
$statement = undef;
}
next LINE;
}
# Normal Fortran
if ($value =~ $RE{COMMENT}) {
next LINE;
}
if (!$statement->{line_number}) {
$statement->{line_number} = $.;
}
my ($cont_head, $cont_tail);
if ($statement->{line_number} != $.) { # is a continuation
($cont_head, $cont_tail) = $value =~ $RE{CONT_LEAD};
if ($cont_head) {
$value = $cont_tail;
}
}
# Correctly handle ! and & in quotes
my ($head, $tail) = (q{}, $value);
if ($state->{in_quote} && index($value, $state->{in_quote}) >= 0) {
my $index = index($value, $state->{in_quote});
$head = substr($value, 0, $index + 1);
$tail
= length($value) > $index + 1
? substr($value, $index + 2)
: q{};
$state->{in_quote} = undef;
}
if (!$state->{in_quote}) {
while ($tail) {
if (index($tail, q{!}) >= 0) {
if (!($tail =~ s/$RE{COMMENT_END}/$1/)) {
($head, $tail, $state->{in_quote})
= _load_extract_quote($head, $tail);
}
}
else {
while (index($tail, q{'}) > 0
|| index($tail, q{"}) > 0)
{
($head, $tail, $state->{in_quote})
= _load_extract_quote($head, $tail);
}
$head .= $tail;
$tail = q{};
}
}
}
$cont_head ||= q{};
push(@{$statement->{lines}}, $cont_head . $head . $tail . "\n");
$statement->{value} .= $head . $tail;
# Process a statement only if it is marked with a continuation
if (!($statement->{value} =~ s/$RE{CONT}/$1/)) {
$statement->{value} =~ s{\s+\z}{}msx;
if (_process($statement, $ctx, $state)) {
push(@{$ctx->{statements}}, $statement);
}
$statement = undef;
}
}
return $ctx;
}
# Helper, removes a quoted string from $tail.
sub _load_extract_quote {
my ($head, $tail) = @_;
my ($extracted, $remainder, $prefix)
= extract_delimited($tail, q{'"}, qr{[^'"]*}msx, q{});
if ($extracted) {
return ($head . $prefix . $extracted, $remainder);
}
else {
my ($quote) = $tail =~ $RE{QUOTE};
return ($head . $tail, q{}, $quote);
}
}
# Study statements and put attributes into array $statements
sub _process {
my ($statement, $ctx, $state) = @_;
my $name;
# End Interface
if ($state->{in_interface}) {
if ($statement->{value} =~ qr{\A\s*end\s*interface\b}imsx) {
$state->{in_interface} = 0;
}
return;
}
# End Program Unit
if (@{$state->{stack}} && $statement->{value} =~ qr{\A\s*end\b}imsx) {
my ($end, $type, $symbol) = lc($statement->{value}) =~ $RE{UNIT_END};
if (!$end) {
return;
}
my ($top_type, $top_symbol) = @{$state->{stack}->[-1]};
if (!$type
|| $top_type eq $type && (!$symbol || $top_symbol eq $symbol))
{
pop(@{$state->{stack}});
if ($state->{in_contains} && !@{$state->{stack}}) {
$state->{in_contains} = 0;
}
if (!$state->{in_contains}) {
$statement->{name} = $top_type;
$statement->{symbol} = $top_symbol;
$statement->{type} = 'end';
return $statement;
}
}
return;
}
# Interface/Contains
($name) = $statement->{value} =~ qr{\A\s*(contains|interface)\b}imsx;
if ($name) {
$state->{'in_' . lc($name)} = 1;
return;
}
# Program Unit
my ($type, $symbol, @tokens) = _process_prog_unit($statement->{value});
if ($type) {
push(@{$state->{stack}}, [$type, $symbol]);
if ($state->{in_contains}) {
return;
}
$statement->{name} = lc($type);
$statement->{type} = 'signature';
$statement->{symbol} = lc($symbol);
$ctx->{signature_token_set_of}{$symbol}
= {map { (lc($_) => 1) } @tokens};
return $statement;
}
if ($state->{in_contains}) {
return;
}
# Use
if ($statement->{value} =~ qr{\A\s*(use)\b}imsx) {
$statement->{name} = 'use';
$statement->{type} = 'use';
return $statement;
}
# Type Declarations
($name) = $statement->{value} =~ $RE{TYPE_SPEC};
if ($name) {
$name =~ s{\s}{}gmsx;
$statement->{name} = lc($name);
$statement->{type} = 'type';
return $statement;
}
# Attribute Statements
($name) = $statement->{value} =~ $RE{TYPE_ATTR};
if ($name) {
$statement->{name} = $name;
$statement->{type} = 'attr';
return $statement;
}
}
# Parse a statement for program unit header. Returns a list containing the type,
# the symbol and the signature tokens of the program unit.
sub _process_prog_unit {
my ($string) = @_;
my ($type, $symbol, @args) = (q{}, q{});
# Is it a blockdata, module or program?
($type, $symbol) = $string =~ $RE{UNIT_BASE};
if ($type) {
$type = lc($type);
$type =~ s{\s*}{}gmsx;
return ($type, $symbol);
}
# Remove the attribute and type declaration of a procedure
$string =~ s/$RE{UNIT_ATTR}/$1/;
my ($match) = $string =~ $RE{UNIT_SPEC};
if ($match) {
$string = $match;
extract_bracketed($string);
}
# Is it a function or subroutine?
($type, $symbol) = lc($string) =~ $RE{UNIT_CALL};
if (!$type) {
return;
}
my $extracted = extract_bracketed($string, q{()}, qr{[^(]*}msx);
# Get signature tokens from SUBROUTINE/FUNCTION
if ($extracted) {
$extracted =~ s{\s}{}gmsx;
@args = split(q{,}, substr($extracted, 1, length($extracted) - 2));
if ($type eq 'function') {
my $result = extract_bracketed($string, q{()}, qr{[^(]*}msx);
if ($result) {
$result =~ s{\A\(\s*(.*?)\s*\)\z}{$1}msx; # remove braces
push(@args, $result);
}
else {
push(@args, $symbol);
}
}
}
return (lc($type), lc($symbol), map { lc($_) } @args);
}
# Reduces the list of statements to contain only the interface block.
sub _reduce_to_interface {
my ($ctx) = @_;
my (%token_set, @interface_statements);
STATEMENT:
for my $statement (reverse(@{$ctx->{statements}})) {
if ($statement->{type} eq 'end'
&& grep { $_ eq $statement->{name} } qw{subroutine function})
{
push(@interface_statements, $statement);
%token_set
= %{$ctx->{signature_token_set_of}{$statement->{symbol}}};
next STATEMENT;
}
if ($statement->{type} eq 'signature'
&& grep { $_ eq $statement->{name} } qw{subroutine function})
{
push(@interface_statements, $statement);
%token_set = ();
next STATEMENT;
}
if ($statement->{type} eq 'use') {
my ($head, $tail)
= split(qr{\s*:\s*}msx, lc($statement->{value}), 2);
if ($tail) {
my @imports = map { [split(qr{\s*=>\s*}msx, $_, 2)] }
split(qr{\s*,\s*}msx, $tail);
my @useful_imports
= grep { exists($token_set{$_->[0]}) } @imports;
if (!@useful_imports) {
next STATEMENT;
}
if (@imports != @useful_imports) {
my @token_strings
= map { $_->[0] . ($_->[1] ? ' => ' . $_->[1] : q{}) }
@useful_imports;
my ($last, @rest) = reverse(@token_strings);
my @token_lines
= (reverse(map { $_ . q{,&} } @rest), $last);
push(
@interface_statements,
{ lines => [
sprintf("%s:&\n", $head),
(map { sprintf(" & %s\n", $_) } @token_lines),
]
},
);
next STATEMENT;
}
}
push(@interface_statements, $statement);
next STATEMENT;
}
if ($statement->{type} eq 'attr') {
my ($spec, @tokens) = ($statement->{value} =~ /$RE{NAME_COMP}/g);
if (grep { exists($token_set{$_}) } @tokens) {
for my $token (@tokens) {
$token_set{$token} = 1;
}
push(@interface_statements, $statement);
next STATEMENT;
}
}
if ($statement->{type} eq 'type') {
my ($variable_string, $spec_string)
= reverse(split('::', lc($statement->{value}), 2));
if ($spec_string) {
$spec_string =~ s{$RE{NAME_LEAD}}{}msx;
}
else {
# The first expression in the statement is the type + attrib
$variable_string =~ s{$RE{NAME_LEAD}}{}msx;
$spec_string = extract_bracketed($variable_string, '()',
qr{[\s\*]*}msx);
}
# Useful tokens are those that comes after a comma
my $tail = q{,} . lc($variable_string);
my @tokens;
while ($tail) {
if ($tail =~ qr{\A\s*['"]}msx) {
extract_delimited($tail, q{'"}, qr{\A[^'"]*}msx, q{});
}
elsif ($tail =~ qr{\A\s*\(}msx) {
extract_bracketed($tail, '()', qr{\A[^(]*}msx);
}
else {
my $token;
($token, $tail) = $tail =~ $RE{NAME_LIST};
if ($token && $token_set{$token}) {
@tokens = ($variable_string =~ /$RE{NAME_COMP}/g);
$tail = q{};
}
}
}
if (@tokens && $spec_string) {
my @spec_tokens = (lc($spec_string) =~ /$RE{NAME_COMP}/g);
push(
@tokens,
( grep { !exists($TYPE_DECL_KEYWORD_SET{$_}) }
@spec_tokens
),
);
}
if (grep { exists($token_set{$_}) } @tokens) {
for my $token (@tokens) {
$token_set{$token} = 1;
}
push(@interface_statements, $statement);
next STATEMENT;
}
}
}
if (!@interface_statements) {
return [];
}
[ {lines => ["interface\n"]},
reverse(@interface_statements),
{lines => ["end interface\n"]},
];
}
# Processes and returns the line of the statement.
sub _present_line {
my ($statement) = @_;
map {
s{\s+}{ }gmsx; # collapse multiple spaces
s{\s+\z}{\n}msx; # remove trailing spaces
$_;
} @{$statement->{lines}};
}
# ------------------------------------------------------------------------------
1;
__END__
=head1 NAME
FCM1::Build::Fortran
=head1 SYNOPSIS
use FCM1::Build::Fortran;
my $fortran_util = FCM1::Build::Fortran->new();
open(my($handle), '<', $path_to_a_fortran_source_file);
print($fortran_util->extract_interface($handle)); # prints interface
close($handle);
=head1 DESCRIPTION
A class to analyse Fortran source. Currently, it has a single method to extract
the calling interfaces of top level subroutines and functions in a Fortran
source.
=head1 METHODS
=over 4
=item $class->new()
Creates and returns an instance of this class.
=item $instance->extract_interface($handle)
Extracts the calling interfaces of top level subroutines and functions in a
Fortran source that can be read from $handle. Returns an interface block as a
list of lines.
=back
=head1 ACKNOWLEDGEMENT
This module is inspired by the logic developed by the European Centre
for Medium-Range Weather Forecasts (ECMWF).
=head1 COPYRIGHT
(C) Crown copyright Met Office. All rights reserved.
=cut
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