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134 lines
3.3 KiB
Perl
Executable File
134 lines
3.3 KiB
Perl
Executable File
#!/usr/bin/env perl
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# SPDX-FileCopyrightText: 2021 Pragmatic Software <pragma78@gmail.com>
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# SPDX-License-Identifier: MIT
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use strict;
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use warnings;
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use lib ".";
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use Parse::RecDescent;
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use Getopt::Std;
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use Data::Dumper;
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our ($opt_T, $opt_t, $opt_o, $opt_P);
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getopts('TPto:');
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if ($opt_T ) {
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$::RD_TRACE = 1;
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} else {
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undef $::RD_TRACE ;
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}
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$::RD_HINT = 1;
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$Parse::RecDescent::skip = '\s*';
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my $parser;
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if($opt_P or !eval { require PCGrammar }) {
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precompile_grammar();
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require PCGrammar;
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}
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$parser = PCGrammar->new() or die "Bad grammar!\n";
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if ($opt_o) {
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open(OUTFILE, ">>$opt_o");
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*STDOUT = *OUTFILE{IO};
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}
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my $text = "";
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foreach my $arg (@ARGV) {
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print STDERR "Opening file $arg\n";
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open(CFILE, "$arg") or die "Could not open $arg.\n";
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local $/;
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$text = <CFILE>;
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close(CFILE);
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print STDERR "parsing...\n";
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# for debugging...
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if ($opt_t) {
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$::RD_TRACE = 1;
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} else {
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undef $::RD_TRACE;
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}
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my $result = $parser->startrule(\$text) or die "Bad text!\n$text\n";
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$text =~ s/^\s+//g;
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$text =~ s/\s+$//g;
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if(length $text) {
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print "Bad parse at: $text";
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} else {
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my $output = join('', flatten($result));
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# beautification
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my @quotes;
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$output =~ s/(?:\"((?:\\\"|(?!\").)*)\")/push @quotes, $1; '"' . ('-' x length $1) . '"'/ge;
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$output =~ s/\ban un/a un/g;
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$output =~ s/\ban UTF/a UTF/g;
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$output =~ s/the value the expression/the value of the expression/g;
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$output =~ s/the value the member/the value of the member/g;
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$output =~ s/the value the/the/g;
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$output =~ s/of evaluate/of/g;
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$output =~ s/the evaluate the/the/g;
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$output =~ s/by evaluate the/by the/g;
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$output =~ s/the a /the /g;
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$output =~ s/Then if it has the value/If it has the value/g;
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$output =~ s/result of the expression a generic-selection/result of a generic-selection/g;
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$output =~ s/the result of the expression (an?) (16-bit character|32-bit character|wide character|UTF-8) string/$1 $2 string/gi;
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$output =~ s/the function a generic-selection/the function resulting from a generic-selection/g;
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$output =~ s/\.\s+Then exit switch block/ and then exit switch block/g;
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$output =~ s/,\././g;
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$output =~ s/of unspecified length //g;
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while($output =~ s/const const/const/g){};
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foreach my $quote (@quotes) {
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next unless $quote;
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$output =~ s/"-+"/"$quote"/;
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}
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print $output;
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}
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}
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sub precompile_grammar {
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print STDERR "Precompiling grammar...\n";
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open GRAMMAR, 'CGrammar.pm' or die "Could not open CGrammar.pm: $!";
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local $/;
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my $grammar = <GRAMMAR>;
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close GRAMMAR;
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Parse::RecDescent->Precompile($grammar, "PCGrammar") or die "Could not precompile: $!";
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}
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sub flatten { map { ref eq 'ARRAY' ? flatten(@$_) : $_ } @_ }
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sub isfalse {
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return istrue($_[0], 'zero');
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}
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sub istrue {
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my @parts = split /(?<!,) and /, $_[0];
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my $truthy = defined $_[1] ? $_[1] : 'nonzero';
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my ($result, $and) = ('', '');
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foreach my $part (@parts) {
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$result .= $and;
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if($part !~ /(discard the result|result discarded|greater|less|equal|false$)/) {
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$result .= "$part is $truthy";
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} else {
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$result .= $part;
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}
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$and = ' and ';
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}
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$result =~ s/is $truthy and the result discarded/is evaluated and the result discarded/g;
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$result =~ s/is ((?:(?!evaluated).)+) and the result discarded/is evaluated to be $1 and the result discarded/g;
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return $result;
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}
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