1 | # ------------------------------------------------------------------------------ |
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2 | # (C) British Crown Copyright 2006-17 Met Office. |
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3 | # |
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4 | # This file is part of FCM, tools for managing and building source code. |
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5 | # |
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6 | # FCM is free software: you can redistribute it and/or modify |
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7 | # it under the terms of the GNU General Public License as published by |
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8 | # the Free Software Foundation, either version 3 of the License, or |
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9 | # (at your option) any later version. |
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10 | # |
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11 | # FCM is distributed in the hope that it will be useful, |
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12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | # GNU General Public License for more details. |
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15 | # |
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16 | # You should have received a copy of the GNU General Public License |
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17 | # along with FCM. If not, see <http://www.gnu.org/licenses/>. |
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18 | # ------------------------------------------------------------------------------ |
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19 | use strict; |
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20 | use warnings; |
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21 | |
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22 | # ------------------------------------------------------------------------------ |
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23 | package FCM::System::Make::Build::Task::ExtractInterface; |
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24 | use base qw{FCM::Class::CODE}; |
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25 | |
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26 | use FCM::System::Exception; |
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27 | use Text::Balanced qw{extract_bracketed extract_delimited}; |
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28 | use Text::ParseWords qw{shellwords}; |
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29 | |
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30 | # Alias |
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31 | my $E = 'FCM::System::Exception'; |
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32 | |
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33 | # Regular expressions |
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34 | my $RE_ATTR = qr{ |
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35 | allocatable|dimension|external|intent|optional|parameter|pointer|save|target |
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36 | }imsx; |
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37 | my $RE_FILE = qr{[\w\-+.]+}imsx; |
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38 | my $RE_NAME = qr{[A-Za-z]\w*}imsx; |
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39 | my $RE_SPEC = qr{ |
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40 | character|class|complex|double\s*complex|double\s*precision|integer| |
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41 | logical|procedure|real|type |
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42 | }imsx; |
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43 | my $RE_UNIT_BASE = qr{block\s*data|module|program|submodule}imsx; |
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44 | my $RE_UNIT_CALL = qr{function|subroutine}imsx; |
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45 | my $RE_UNIT = qr{$RE_UNIT_BASE|$RE_UNIT_CALL}msx; |
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46 | my %RE = ( |
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47 | COMMENT => qr{\A\s*(?:!|\z)}msx, |
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48 | COMMENT_END => qr{\A([^'"]*?)\s*!.*\z}msx, |
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49 | CONT => qr{\A(.*)&\s*\z}msx, |
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50 | CONT_LEAD => qr{\A(\s*&)(.*)\z}msx, |
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51 | INCLUDE => qr{(?:\#|\s*)include\s*}imsx, |
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52 | NAME_COMP => qr{\b($RE_NAME)(?:\s*\%\s*$RE_NAME)*\b}msx, |
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53 | NAME_LEAD => qr{\A\s*$RE_NAME\s*}msx, |
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54 | NAME_LIST => qr{\A(?:.*?)\s*,\s*($RE_NAME)\b(.*)\z}msx, |
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55 | QUOTE => qr{\A[^'"]*(['"])}msx, |
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56 | TYPE_ATTR => qr{\A\s*($RE_ATTR)\b}msx, |
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57 | TYPE_SPEC => qr{\A\s*($RE_SPEC)\b}msx, |
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58 | UNIT_ATTR => qr{\A\s*(?:(?:(?:impure\s+)?elemental|recursive|pure)\s+)+(.*)\z}imsx, |
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59 | UNIT_BASE => qr{\A\s*($RE_UNIT_BASE)\s+($RE_NAME)\s*\z}imsx, |
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60 | UNIT_CALL => qr{\A\s*($RE_UNIT_CALL)\s+($RE_NAME)\b}imsx, |
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61 | UNIT_END => qr{\A\s*(end)(?:\s+($RE_NAME)(?:\s+($RE_NAME))?)?\s*\z}imsx, |
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62 | UNIT_SPEC => qr{\A\s*$RE_SPEC\b(.*)\z}imsx, |
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63 | ); |
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64 | |
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65 | # Keywords in type declaration statements |
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66 | my %TYPE_DECL_KEYWORD_SET = map { ($_, 1) } qw{ |
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67 | allocatable |
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68 | asynchronous |
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69 | contiguous |
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70 | dimension |
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71 | external |
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72 | in |
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73 | inout |
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74 | intent |
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75 | kind |
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76 | len |
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77 | optional |
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78 | out |
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79 | parameter |
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80 | pointer |
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81 | save |
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82 | target |
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83 | value |
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84 | volatile |
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85 | }; |
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86 | |
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87 | __PACKAGE__->class({util => '&'}, {action_of => {main => \&_main}}); |
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88 | |
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89 | sub _main { |
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90 | my ($attrib_ref, $target) = @_; |
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91 | my $handle |
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92 | = $attrib_ref->{util}->file_load_handle($target->get_path_of_source()); |
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93 | eval { |
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94 | $attrib_ref->{util}->file_save( |
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95 | $target->get_path(), |
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96 | [ map { s{\s+}{ }gmsx; s{\s+\z}{\n}msx; $_ } |
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97 | map { @{$_->{lines}} } |
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98 | @{_reduce_to_interface(_extract_statements($handle))} |
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99 | ], |
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100 | ); |
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101 | }; |
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102 | if ($@) { |
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103 | my $e = $@; |
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104 | if ($E->caught($e) && $e->get_code() eq $E->BUILD_SOURCE_SYN) { |
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105 | unshift(@{$e->get_ctx()}, $target->get_path_of_source()); |
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106 | } |
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107 | die($e); |
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108 | } |
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109 | close($handle); |
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110 | $target; |
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111 | } |
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112 | |
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113 | # Reads $handle for the next Fortran statement, handling continuations. |
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114 | sub _extract_statements { |
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115 | my ($handle) = @_; |
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116 | my $context = {signature_token_set_of => {}, statements => []}; |
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117 | my $state = { |
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118 | in_contains => undef, |
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119 | in_interface => undef, |
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120 | in_quote => undef, |
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121 | in_type => undef, |
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122 | stack => [], |
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123 | }; |
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124 | my $NEW_STATEMENT = sub { |
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125 | { name => q{}, |
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126 | lines => [], |
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127 | line_number => 0, |
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128 | symbol => q{}, |
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129 | type => q{}, |
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130 | value => q{}, |
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131 | }; |
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132 | }; |
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133 | my $statement; |
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134 | LINE: |
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135 | while (my $line = readline($handle)) { |
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136 | if (!defined($statement)) { |
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137 | $statement = $NEW_STATEMENT->(); |
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138 | } |
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139 | my $value = $line; |
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140 | chomp($value); |
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141 | if (!$statement->{line_number} && index($value, '#') == 0) { |
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142 | $statement->{line_number} = $.; |
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143 | $statement->{name} = 'cpp'; |
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144 | } |
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145 | if ($statement->{name} eq 'cpp') { |
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146 | push(@{$statement->{lines}}, $line); |
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147 | $statement->{value} .= $value; |
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148 | if (rindex($value, '\\') != length($value) - 1) { |
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149 | #push(@{$context->{statements}}, $statement); |
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150 | $statement = undef; |
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151 | } |
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152 | next LINE; |
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153 | } |
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154 | if ($value =~ $RE{COMMENT}) { |
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155 | next LINE; |
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156 | } |
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157 | if (!$statement->{line_number}) { |
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158 | $statement->{line_number} = $.; |
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159 | } |
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160 | my ($cont_head, $cont_tail); |
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161 | if ($statement->{line_number} != $.) { # is a continuation |
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162 | ($cont_head, $cont_tail) = $value =~ $RE{CONT_LEAD}; |
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163 | if ($cont_head) { |
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164 | $value = $cont_tail; |
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165 | } |
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166 | } |
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167 | my ($head, $tail) = (q{}, $value); |
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168 | if ($state->{in_quote} && index($value, $state->{in_quote}) >= 0) { |
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169 | my $index = index($value, $state->{in_quote}); |
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170 | $head = substr($value, 0, $index + 1); |
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171 | $tail |
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172 | = length($value) > $index + 1 |
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173 | ? substr($value, $index + 2) |
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174 | : q{}; |
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175 | $state->{in_quote} = undef; |
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176 | } |
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177 | if (!$state->{in_quote}) { |
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178 | while ($tail) { |
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179 | if (index($tail, q{!}) >= 0) { |
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180 | if (!($tail =~ s/$RE{COMMENT_END}/$1/)) { |
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181 | ($head, $tail, $state->{in_quote}) |
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182 | = _extract_statement_quote($head, $tail); |
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183 | } |
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184 | } |
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185 | else { |
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186 | while (index($tail, q{'}) > 0 |
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187 | || index($tail, q{"}) > 0) |
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188 | { |
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189 | ($head, $tail, $state->{in_quote}) |
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190 | = _extract_statement_quote($head, $tail); |
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191 | } |
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192 | $head .= $tail; |
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193 | $tail = q{}; |
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194 | } |
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195 | } |
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196 | } |
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197 | $cont_head ||= q{}; |
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198 | push(@{$statement->{lines}}, $cont_head . $head . $tail . "\n"); |
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199 | $statement->{value} .= $head . $tail; |
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200 | if (!($statement->{value} =~ s/$RE{CONT}/$1/)) { |
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201 | $statement->{value} =~ s{\s+\z}{}msx; |
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202 | if (_process($statement, $context, $state)) { |
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203 | push(@{$context->{statements}}, $statement); |
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204 | } |
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205 | $statement = undef; |
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206 | } |
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207 | } |
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208 | return $context; |
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209 | } |
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210 | |
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211 | # Helper, removes a quoted string from $tail. |
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212 | sub _extract_statement_quote { |
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213 | my ($head, $tail) = @_; |
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214 | my ($extracted, $remainder, $prefix) |
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215 | = extract_delimited($tail, q{'"}, qr{[^'"]*}msx, q{}); |
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216 | if ($extracted) { |
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217 | return ($head . $prefix . $extracted, $remainder); |
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218 | } |
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219 | else { |
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220 | my ($quote) = $tail =~ $RE{QUOTE}; |
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221 | return ($head . $tail, q{}, $quote); |
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222 | } |
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223 | } |
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224 | |
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225 | # Read a statement and put attributes into $statement |
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226 | sub _process { |
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227 | my ($statement, $context, $state) = @_; |
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228 | my $name; |
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229 | |
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230 | # End Interface |
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231 | if ($state->{in_interface}) { |
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232 | if ($statement->{value} =~ qr{\A\s*end\s*interface\b}imsx) { |
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233 | $state->{in_interface} = 0; |
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234 | } |
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235 | return; |
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236 | } |
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237 | |
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238 | # End Program Unit |
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239 | if (@{$state->{stack}} && $statement->{value} =~ qr{\A\s*end\b}imsx) { |
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240 | my ($end, $type, $symbol) = lc($statement->{value}) =~ $RE{UNIT_END}; |
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241 | if (!$end) { |
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242 | return; |
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243 | } |
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244 | my ($top_type, $top_symbol) = @{$state->{stack}->[-1]}; |
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245 | if (!$type |
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246 | || $top_type eq $type && (!$symbol || $top_symbol eq $symbol)) |
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247 | { |
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248 | pop(@{$state->{stack}}); |
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249 | if ($state->{in_contains} && !@{$state->{stack}}) { |
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250 | $state->{in_contains} = 0; |
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251 | } |
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252 | if (!$state->{in_contains}) { |
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253 | $statement->{name} = $top_type; |
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254 | $statement->{symbol} = $top_symbol; |
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255 | $statement->{type} = 'end'; |
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256 | return $statement; |
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257 | } |
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258 | } |
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259 | return; |
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260 | } |
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261 | |
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262 | # Interface/Contains |
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263 | if ($statement->{value} =~ qr{\A\s*contains\b}imsx) { |
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264 | $state->{'in_contains'} = 1; |
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265 | return; |
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266 | } |
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267 | if ($statement->{value} =~ qr{\A\s*(?:abstract\s+)?interface\b}imsx) { |
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268 | $state->{'in_interface'} = 1; |
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269 | return; |
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270 | } |
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271 | |
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272 | # Program Unit |
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273 | my ($type, $symbol, @tokens) = _process_prog_unit($statement->{value}); |
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274 | if ($type) { |
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275 | push(@{$state->{stack}}, [$type, $symbol]); |
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276 | if ($state->{in_contains}) { |
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277 | return; |
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278 | } |
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279 | $statement->{name} = lc($type); |
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280 | $statement->{type} = 'signature'; |
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281 | $statement->{symbol} = lc($symbol); |
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282 | $context->{signature_token_set_of}{$symbol} |
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283 | = {map { (lc($_) => 1) } @tokens}; |
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284 | return $statement; |
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285 | } |
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286 | if ($state->{in_contains}) { |
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287 | return; |
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288 | } |
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289 | |
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290 | # Use |
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291 | if ($statement->{value} =~ qr{\A\s*(use)\b}imsx) { |
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292 | $statement->{name} = 'use'; |
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293 | $statement->{type} = 'use'; |
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294 | return $statement; |
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295 | } |
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296 | |
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297 | # Type Declarations |
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298 | ($name) = $statement->{value} =~ $RE{TYPE_SPEC}; |
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299 | if ($name) { |
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300 | $name =~ s{\s}{}gmsx; |
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301 | $statement->{name} = lc($name); |
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302 | $statement->{type} = 'type'; |
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303 | return $statement; |
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304 | } |
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305 | |
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306 | # Attribute Statements |
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307 | ($name) = $statement->{value} =~ $RE{TYPE_ATTR}; |
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308 | if ($name) { |
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309 | $statement->{name} = lc($name); |
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310 | $statement->{type} = 'attr'; |
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311 | } |
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312 | } |
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313 | |
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314 | # Parse a statement for program unit header. Returns a list containing the type, |
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315 | # the symbol and the signature tokens of the program unit. |
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316 | sub _process_prog_unit { |
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317 | my ($string) = @_; |
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318 | my ($type, $symbol, @args) = (q{}, q{}); |
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319 | ($type, $symbol) = $string =~ $RE{UNIT_BASE}; |
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320 | if ($type) { |
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321 | $type = lc($type); |
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322 | $type =~ s{\s*}{}gmsx; |
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323 | return ($type, $symbol); |
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324 | } |
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325 | $string =~ s/$RE{UNIT_ATTR}/$1/; |
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326 | my ($match) = $string =~ $RE{UNIT_SPEC}; |
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327 | if ($match) { |
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328 | $string = $match; |
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329 | extract_bracketed($string); |
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330 | } |
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331 | ($type, $symbol) = lc($string) =~ $RE{UNIT_CALL}; |
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332 | if (!$type) { |
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333 | return; |
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334 | } |
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335 | my $extracted = extract_bracketed($string, q{()}, qr{[^(]*}msx); |
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336 | |
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337 | # Get arguments/keywords from SUBROUTINE/FUNCTION |
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338 | if ($extracted) { |
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339 | $extracted =~ s{\s}{}gmsx; |
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340 | @args = split(q{,}, substr($extracted, 1, length($extracted) - 2)); |
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341 | if ($type eq 'function') { |
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342 | my $result = extract_bracketed($string, q{()}, qr{[^(]*}msx); |
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343 | if ($result) { |
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344 | $result =~ s{\A\(\s*(.*?)\s*\)\z}{$1}msx; # remove braces |
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345 | push(@args, $result); |
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346 | } |
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347 | else { |
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348 | push(@args, $symbol); |
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349 | } |
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350 | } |
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351 | } |
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352 | return (lc($type), lc($symbol), map { lc($_) } @args); |
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353 | } |
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354 | |
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355 | # Reduces the list of statements to contain only the interface block. |
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356 | sub _reduce_to_interface { |
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357 | my ($context) = @_; |
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358 | my (%token_set, @interface_statements); |
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359 | STATEMENT: |
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360 | for my $statement (reverse(@{$context->{statements}})) { |
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361 | if ($statement->{type} eq 'end' |
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362 | && grep { $_ eq $statement->{name} } qw{subroutine function}) |
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363 | { |
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364 | push(@interface_statements, $statement); |
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365 | %token_set |
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366 | = %{$context->{signature_token_set_of}{$statement->{symbol}}}; |
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367 | next STATEMENT; |
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368 | } |
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369 | if ($statement->{type} eq 'signature' |
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370 | && grep { $_ eq $statement->{name} } qw{subroutine function}) |
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371 | { |
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372 | push(@interface_statements, $statement); |
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373 | %token_set = (); |
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374 | next STATEMENT; |
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375 | } |
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376 | if ($statement->{type} eq 'use') { |
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377 | my ($head, $tail) |
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378 | = split(qr{,\s*only\s*:\s*}msx, lc($statement->{value}), 2); |
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379 | if ($tail) { |
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380 | my @imports = map { [split(qr{\s*=>\s*}msx, $_, 2)] } |
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381 | split(qr{\s*,\s*}msx, $tail); |
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382 | my @useful_imports |
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383 | = grep { exists($token_set{$_->[0]}) } @imports; |
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384 | if (!@useful_imports) { |
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385 | next STATEMENT; |
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386 | } |
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387 | if (@imports != @useful_imports) { |
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388 | my @token_strings |
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389 | = map { $_->[0] . ($_->[1] ? ' => ' . $_->[1] : q{}) } |
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390 | @useful_imports; |
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391 | my ($last, @rest) = reverse(@token_strings); |
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392 | my @token_lines |
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393 | = (reverse(map { $_ . q{,&} } @rest), $last); |
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394 | push( |
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395 | @interface_statements, |
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396 | { lines => [ |
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397 | sprintf("%s, only:&\n", $head), |
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398 | (map { sprintf(" & %s\n", $_) } @token_lines), |
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399 | ] |
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400 | }, |
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401 | ); |
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402 | next STATEMENT; |
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403 | } |
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404 | } |
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405 | push(@interface_statements, $statement); |
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406 | next STATEMENT; |
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407 | } |
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408 | if ($statement->{type} eq 'attr') { |
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409 | my ($spec, @tokens) = ($statement->{value} =~ /$RE{NAME_COMP}/g); |
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410 | if (grep { exists($token_set{lc($_)}) } @tokens) { |
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411 | for my $token (@tokens) { |
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412 | $token_set{$token} = 1; |
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413 | } |
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414 | push(@interface_statements, $statement); |
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415 | next STATEMENT; |
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416 | } |
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417 | } |
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418 | if ($statement->{type} eq 'type') { |
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419 | my ($variable_string, $spec_string) |
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420 | = reverse(split('::', lc($statement->{value}), 2)); |
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421 | if ($spec_string) { |
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422 | $spec_string =~ s{$RE{NAME_LEAD}}{}msx; |
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423 | } |
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424 | else { |
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425 | $variable_string =~ s{$RE{NAME_LEAD}}{}msx; |
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426 | $spec_string = extract_bracketed($variable_string, '()', |
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427 | qr{[\s\*]*}msx); |
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428 | } |
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429 | my $tail = q{,} . lc($variable_string); |
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430 | my @tokens; |
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431 | while ($tail) { |
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432 | if ($tail =~ qr{\A\s*['"]}msx) { |
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433 | my $old_tail = $tail; |
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434 | extract_delimited($tail, q{'"}, qr{\A[^'"]*}msx, q{}); |
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435 | if ($old_tail eq $tail) { |
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436 | return $E->throw( |
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437 | $E->BUILD_SOURCE_SYN, [$statement->{line_number}]); |
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438 | } |
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439 | } |
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440 | elsif ($tail =~ qr{\A\s*\(}msx) { |
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441 | my $old_tail = $tail; |
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442 | extract_bracketed($tail, '()', qr{\A[^(]*}msx); |
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443 | if ($old_tail eq $tail) { |
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444 | return $E->throw( |
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445 | $E->BUILD_SOURCE_SYN, [$statement->{line_number}]); |
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446 | } |
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447 | } |
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448 | else { |
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449 | my $token; |
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450 | ($token, $tail) = $tail =~ $RE{NAME_LIST}; |
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451 | if ($token && $token_set{$token}) { |
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452 | @tokens = ($variable_string =~ /$RE{NAME_COMP}/g); |
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453 | $tail = q{}; |
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454 | } |
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455 | } |
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456 | } |
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457 | if (@tokens && $spec_string) { |
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458 | my @spec_tokens = (lc($spec_string) =~ /$RE{NAME_COMP}/g); |
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459 | push( |
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460 | @tokens, |
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461 | ( grep { !exists($TYPE_DECL_KEYWORD_SET{$_}) } |
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462 | @spec_tokens |
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463 | ), |
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464 | ); |
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465 | } |
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466 | if (grep { exists($token_set{$_}) } @tokens) { |
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467 | for my $token (@tokens) { |
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468 | $token_set{$token} = 1; |
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469 | } |
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470 | push(@interface_statements, $statement); |
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471 | next STATEMENT; |
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472 | } |
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473 | } |
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474 | } |
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475 | if (!@interface_statements) { |
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476 | return []; |
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477 | } |
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478 | [ {lines => ["interface\n"]}, |
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479 | reverse(@interface_statements), |
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480 | {lines => ["end interface\n"]}, |
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481 | ]; |
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482 | } |
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483 | |
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484 | # ------------------------------------------------------------------------------ |
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485 | 1; |
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486 | __END__ |
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487 | |
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488 | =head1 NAME |
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489 | |
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490 | FCM::System::Make::Build::Task::ExtractInterface |
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491 | |
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492 | =head1 SYNOPSIS |
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493 | |
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494 | use FCM::System::Make::Build::Task::ExtractInterface; |
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495 | my $task = FCM::System::Make::Build::Task::ExtractInterface->new(\%attrib); |
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496 | $task->main($target); |
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497 | |
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498 | =head1 DESCRIPTION |
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499 | |
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500 | Extracts the calling interfaces of top level functions and subroutines in the |
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501 | Fortran source file of the target. |
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502 | |
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503 | =head1 METHODS |
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504 | |
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505 | =over 4 |
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506 | |
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507 | =item $class->new(\%attrib) |
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508 | |
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509 | Creates and returns a new instance. %attrib should contain: |
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510 | |
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511 | =over 4 |
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512 | |
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513 | =item {util} |
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514 | |
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515 | An instance of L<FCM::Util|FCM::Util>. |
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516 | |
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517 | =back |
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518 | |
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519 | =item $instance->main($target) |
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520 | |
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521 | Extracts the calling interfaces of top level functions and subroutines in the |
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522 | Fortran source file of the target, and writes the results to the path of the |
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523 | target. |
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524 | |
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525 | =back |
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526 | |
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527 | =head1 ACKNOWLEDGEMENT |
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528 | |
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529 | This module is inspired by the logic developed by the European Centre |
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530 | for Medium-Range Weather Forecasts (ECMWF). |
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531 | |
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532 | =head1 COPYRIGHT |
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533 | |
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534 | (C) Crown copyright Met Office. All rights reserved. |
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535 | |
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536 | =cut |
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