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This is expected to take three commits to complete. This first initial commit does the following: - Begin initial rough-draft of doc/VirtualMachine.md - Begin initial refactoring of scripts The next commit will polish up the initial rough-draft and refactoring. The final commit will quality-check everything and fix anything overlooked.
263 lines
8.1 KiB
Perl
Executable File
263 lines
8.1 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 warnings;
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use strict;
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package Languages::java;
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use parent 'Languages::_default';
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use Text::Balanced qw/extract_bracketed/;
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sub initialize {
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my ($self, %conf) = @_;
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$self->{sourcefile} = 'prog.java';
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$self->{execfile} = 'prog';
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$self->{default_options} = '';
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$self->{cmdline} = 'javac $options $sourcefile';
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$self->{prelude} = <<'END';
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import java.*;
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END
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}
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sub process_custom_options {
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my $self = shift;
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$self->{code} = $self->{code};
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$self->add_option("-nomain") if $self->{code} =~ s/(?:^|(?<=\s))-nomain\s*//i;
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$self->add_option("-noheaders") if $self->{code} =~ s/(?:^|(?<=\s))-noheaders\s*//i;
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$self->{code} = $self->{code};
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}
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sub pretty_format {
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my $self = shift;
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my $code = join '', @_;
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my $result;
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$code = $self->{code} if not defined $code;
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open my $fh, ">$self->{sourcefile}" or die "Couldn't write $self->{sourcefile}: $!";
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print $fh $code;
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close $fh;
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system("astyle", "-A3 -UHpnfq", $self->{sourcefile});
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open $fh, "<$self->{sourcefile}" or die "Couldn't read $self->{sourcefile}: $!";
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$result = join '', <$fh>;
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close $fh;
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return $result;
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}
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sub preprocess_code {
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my $self = shift;
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$self->SUPER::preprocess_code;
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my $default_prelude = exists $self->{options}->{'-noheaders'} ? '' : $self->{prelude};
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print "code before: [$self->{code}]\n" if $self->{debug};
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# add newlines to ends of statements and #includes
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my $single_quote = 0;
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my $double_quote = 0;
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my $parens = 0;
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my $escaped = 0;
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while($self->{code} =~ m/(.)/msg) {
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my $ch = $1;
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my $pos = pos $self->{code};
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print "adding newlines, ch = [$ch], parens: $parens, single: $single_quote, double: $double_quote, escaped: $escaped, pos: $pos\n" if $self->{debug} >= 10;
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if($ch eq '\\') {
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$escaped = not $escaped;
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} elsif($ch eq '"') {
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$double_quote = not $double_quote unless $escaped or $single_quote;
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$escaped = 0;
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} elsif($ch eq '(' and not $single_quote and not $double_quote) {
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$parens++;
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} elsif($ch eq ')' and not $single_quote and not $double_quote) {
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$parens--;
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$parens = 0 if $parens < 0;
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} elsif($ch eq ';' and not $single_quote and not $double_quote and $parens == 0) {
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if(not substr($self->{code}, $pos, 1) =~ m/[\n\r]/) {
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substr ($self->{code}, $pos, 0) = "\n";
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pos $self->{code} = $pos + 1;
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}
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} elsif($ch eq "'") {
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$single_quote = not $single_quote unless $escaped or $double_quote;
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$escaped = 0;
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} elsif($ch eq 'n' and $escaped) {
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if(not $single_quote and not $double_quote) {
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print "added newline\n" if $self->{debug} >= 10;
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substr ($self->{code}, $pos - 2, 2) = "\n";
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pos $self->{code} = $pos;
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}
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$escaped = 0;
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} elsif($ch eq '{' and not $single_quote and not $double_quote) {
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if(not substr($self->{code}, $pos, 1) =~ m/[\n\r]/) {
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substr ($self->{code}, $pos, 0) = "\n";
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pos $self->{code} = $pos + 1;
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}
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} elsif($ch eq '}' and not $single_quote and not $double_quote) {
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if(not substr($self->{code}, $pos, 1) =~ m/[\n\r;]/) {
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substr ($self->{code}, $pos, 0) = "\n";
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pos $self->{code} = $pos + 1;
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}
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} else {
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$escaped = 0;
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}
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}
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print "code after \\n additions: [$self->{code}]\n" if $self->{debug};
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# white-out contents of quoted literals so content within literals aren't parsed as code
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my $white_code = $self->{code};
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$white_code =~ s/(?:\"((?:\\\"|(?!\").)*)\")/'"' . ('-' x length $1) . '"'/ge;
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$white_code =~ s/(?:\'((?:\\\'|(?!\').)*)\')/"'" . ('-' x length $1) . "'"/ge;
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my $precode;
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if($white_code =~ m/\bimport\s/) {
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$precode = $self->{code};
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} else {
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$precode = $default_prelude . $self->{code};
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}
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$self->{code} = '';
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print "--- precode: [$precode]\n" if $self->{debug};
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$self->{warn_unterminated_define} = 0;
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my $has_main = 0;
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my $prelude = '';
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while($precode =~ s/^\s*(import .*\n{1,2})//g) {
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$prelude .= $1;
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}
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print "*** prelude: [$prelude]\n precode: [$precode]\n" if $self->{debug};
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my $preprecode = $precode;
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# white-out contents of quoted literals
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$preprecode =~ s/(?:\"((?:\\\"|(?!\").)*)\")/'"' . ('-' x length $1) . '"'/ge;
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$preprecode =~ s/(?:\'((?:\\\'|(?!\').)*)\')/"'" . ('-' x length $1) . "'"/ge;
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# strip comments
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$preprecode =~ s#|//([^\\]|[^\n][\n]?)*?\n|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^/"'\\]*)#defined $2 ? $2 : ""#gse;
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$preprecode =~ s#/\*[^*]*\*+([^/*][^*]*\*+)*/# #gs;
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print "preprecode: [$preprecode]\n" if $self->{debug};
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print "looking for functions, has main: $has_main\n" if $self->{debug} >= 2;
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my $func_regex = qr/^([ *\w]+)\s+([ ()*\w:]+)\s*\(([^;{]*)\s*\)\s*({.*|<%.*|\?\?<.*)/ims;
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# look for potential functions to extract
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while($preprecode =~ /$func_regex/ms) {
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my ($pre_ret, $pre_ident, $pre_params, $pre_potential_body) = ($1, $2, $3, $4);
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my $precode_code;
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print "looking for functions, found [$pre_ret][$pre_ident][$pre_params][$pre_potential_body], has main: $has_main\n" if $self->{debug} >= 1;
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# find the pos at which this function lives, for extracting from precode
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$preprecode =~ m/(\Q$pre_ret\E\s+\Q$pre_ident\E\s*\(\s*\Q$pre_params\E\s*\)\s*\Q$pre_potential_body\E)/g;
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my $extract_pos = (pos $preprecode) - (length $1);
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# now that we have the pos, substitute out the extracted potential function from preprecode
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$preprecode =~ s/$func_regex//ms;
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# create tmpcode object that starts from extract pos, to skip any quoted code
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my $tmpcode = substr($precode, $extract_pos);
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print "tmpcode: [$tmpcode]\n" if $self->{debug};
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$precode = substr($precode, 0, $extract_pos);
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print "precode: [$precode]\n" if $self->{debug};
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$precode_code = $precode;
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$tmpcode =~ m/$func_regex/ms;
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my ($ret, $ident, $params, $potential_body) = ($1, $2, $3, $4);
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print "1st extract: [$ret][$ident][$params][$potential_body]\n" if $self->{debug};
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$ret =~ s/^\s+//;
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$ret =~ s/\s+$//;
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if(not length $ret or $ret eq "else" or $ret eq "while" or $ret eq "if" or $ret eq "for" or $ident eq "for" or $ident eq "while" or $ident eq "if") {
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$precode .= "$ret $ident ($params) $potential_body";
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next;
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} else {
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$tmpcode =~ s/$func_regex//ms;
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}
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$potential_body =~ s/^\s*<%/{/ms;
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$potential_body =~ s/%>\s*$/}/ms;
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$potential_body =~ s/^\s*\?\?</{/ms;
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$potential_body =~ s/\?\?>$/}/ms;
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my @extract = extract_bracketed($potential_body, '{}');
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my $body;
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if(not defined $extract[0]) {
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if($self->{debug} == 0) {
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print "error: unmatched brackets\n";
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} else {
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print "error: unmatched brackets for function '$ident';\n";
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print "body: [$potential_body]\n";
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}
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exit;
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} else {
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$body = $extract[0];
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$preprecode = $extract[1];
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$precode = $extract[1];
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}
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print "final extract: [$ret][$ident][$params][$body]\n" if $self->{debug};
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$self->{code} .= "$precode_code\n$ret $ident($params) $body\n";
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if($self->{debug} >= 2) { print '-' x 20 . "\n" }
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print " code: [$self->{code}]\n" if $self->{debug} >= 2;
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if($self->{debug} >= 2) { print '-' x 20 . "\n" }
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print " precode: [$precode]\n" if $self->{debug} >= 2;
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$has_main = 1 if $ident =~ m/^\s*\(?\s*main\s*\)?\s*$/;
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}
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$precode =~ s/^\s+//;
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$precode =~ s/\s+$//;
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$precode =~ s/^{(.*)}$/$1/s;
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if(not $has_main and not exists $self->{options}->{'-nomain'}) {
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if ($precode =~ s/^(};?)//) {
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$self->{code} .= $1;
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}
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$self->{code} = "$prelude\nclass prog {\n$self->{code}\n" . "public static void main(String[] args) {\n$precode\n;\n}\n}\n";
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} else {
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$self->{code} = "$prelude\n$self->{code}\n";
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}
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print "after func extract, code: [$self->{code}]\n" if $self->{debug};
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$self->{code} =~ s/\|n/\n/g;
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$self->{code} =~ s/^\s+//;
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$self->{code} =~ s/\s+$//;
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$self->{code} =~ s/;\s*;\n/;\n/gs;
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$self->{code} =~ s/;(\s*\/\*.*?\*\/\s*);\n/;$1/gs;
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$self->{code} =~ s/;(\s*\/\/.*?\s*);\n/;$1/gs;
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$self->{code} =~ s/({|})\n\s*;\n/$1\n/gs;
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$self->{code} =~ s/(?:\n\n)+/\n\n/g;
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print "final code: [$self->{code}]\n" if $self->{debug};
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}
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1;
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