mirror of https://github.com/pragma-/pbot.git
333 lines
9.7 KiB
Perl
Executable File
333 lines
9.7 KiB
Perl
Executable File
#!/usr/bin/env perl
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# SPDX-FileCopyrightText: 2013-2023 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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use feature "switch";
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no if $] >= 5.018, warnings => 'experimental';
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use IPC::Open2;
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use Text::Balanced qw(extract_bracketed extract_delimited);
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use IO::Socket;
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use LWP::UserAgent;
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my $debug = 0;
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my $USE_LOCAL = defined $ENV{'CC_LOCAL'};
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my $output = "";
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my $nooutput = 'No output.';
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if ($#ARGV < 0) {
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print "Usage: expand <code>\n";
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exit 0;
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}
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my $code = join ' ', @ARGV;
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my $lang = 'C89';
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my $args = "";
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print " code: [$code]\n" if $debug;
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# replace \n outside of quotes with literal newline
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my $new_code = "";
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use constant {
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NORMAL => 0,
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DOUBLE_QUOTED => 1,
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SINGLE_QUOTED => 2,
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};
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my $state = NORMAL;
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my $escaped = 0;
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while ($code =~ m/(.)/gs) {
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my $ch = $1;
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given ($ch) {
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when ('\\') {
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if ($escaped == 0) {
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$escaped = 1;
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next;
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}
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}
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if ($state == NORMAL) {
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when ($_ eq '"' and not $escaped) { $state = DOUBLE_QUOTED; }
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when ($_ eq "'" and not $escaped) { $state = SINGLE_QUOTED; }
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when ($_ eq 'n' and $escaped == 1) {
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$ch = "\n";
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$escaped = 0;
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}
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}
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if ($state == DOUBLE_QUOTED) {
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when ($_ eq '"' and not $escaped) { $state = NORMAL; }
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}
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if ($state == SINGLE_QUOTED) {
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when ($_ eq "'" and not $escaped) { $state = NORMAL; }
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}
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}
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$new_code .= '\\' and $escaped = 0 if $escaped;
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$new_code .= $ch;
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}
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$code = $new_code;
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print "code after \\n replacement: [$code]\n" if $debug;
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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 $cpp = 0; # preprocessor
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$escaped = 0;
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while ($code =~ m/(.)/msg) {
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my $ch = $1;
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my $pos = pos $code;
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print "adding newlines, ch = [$ch], parens: $parens, cpp: $cpp, single: $single_quote, double: $double_quote, escaped: $escaped, pos: $pos\n" if $debug >= 10;
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if ($ch eq '\\') { $escaped = not $escaped; }
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elsif ($ch eq '#' and not $cpp and not $escaped and not $single_quote and not $double_quote) {
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$cpp = 1;
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if ($code =~ m/include\s*[<"]([^>"]*)[>"]/msg) {
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my $match = $1;
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$pos = pos $code;
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substr($code, $pos, 0) = "\n";
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pos $code = $pos;
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$cpp = 0;
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} else {
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pos $code = $pos;
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}
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} elsif ($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 $cpp and not $single_quote and not $double_quote and $parens == 0) {
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if (not substr($code, $pos, 1) =~ m/[\n\r]/) {
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substr($code, $pos, 0) = "\n";
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pos $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 $debug >= 10;
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substr($code, $pos - 2, 2) = "\n";
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pos $code = $pos;
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$cpp = 0;
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}
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$escaped = 0;
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} elsif ($ch eq '{' and not $cpp and not $single_quote and not $double_quote) {
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if (not substr($code, $pos, 1) =~ m/[\n\r]/) {
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substr($code, $pos, 0) = "\n";
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pos $code = $pos + 1;
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}
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} elsif ($ch eq '}' and not $cpp and not $single_quote and not $double_quote) {
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if (not substr($code, $pos, 1) =~ m/[\n\r;]/) {
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substr($code, $pos, 0) = "\n";
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pos $code = $pos + 1;
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}
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} elsif ($ch eq "\n" and $cpp and not $single_quote and not $double_quote) {
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$cpp = 0;
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} else {
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$escaped = 0;
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}
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}
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print "code after \\n additions: [$code]\n" if $debug;
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#$code =~ s/#include [<"'].*?['">]//gm;
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print "code after include removal: [$code]\n" if $debug;
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my $precode = $code;
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$code = '';
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print "--- precode: [$precode]\n" if $debug;
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my $has_main = 0;
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if ($lang eq 'C89' or $lang eq 'C99' or $lang eq 'C11' or $lang eq 'C++') {
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my $prelude = "#include <stdio.h>\n#include <stddef.h>\n#include <stdlib.h>\n";
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while ($precode =~ s/^\s*(#.*\n{1,2})//g) { $prelude .= $1; }
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print "*** prelude: [$prelude]\n precode: [$precode]\n" if $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 $1) . "'"/ge;
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# strip C and C++ style comments
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if ($lang eq 'C89' or $args =~ m/-std=(gnu89|c89)/i) {
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$preprecode =~ s#/\*[^*]*\*+([^/*][^*]*\*+)*/# #gs;
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$preprecode =~ s#|//([^\\]|[^\n][\n]?)*?\n|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^/"'\\]*)#defined $2 ? $2 : ""#gse;
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} else {
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$preprecode =~ s#|//([^\\]|[^\n][\n]?)*?\n|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^/"'\\]*)#defined $2 ? $2 : ""#gse;
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$preprecode =~ s#/\*[^*]*\*+([^/*][^*]*\*+)*/# #gs;
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}
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print "preprecode: [$preprecode]\n" if $debug;
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print "looking for functions, has main: $has_main\n" if $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, $4);
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print "looking for functions, found [$pre_ret][$pre_ident][$pre_params][$pre_potential_body], has main: $has_main\n" if $debug >= 1;
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# find the pos at which this function lives, for extracting from precode
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$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 $debug;
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$precode = substr($precode, 0, $extract_pos);
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print "precode: [$precode]\n" if $debug;
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$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 $debug;
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$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 $extract[0]) {
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if ($debug == 0) { 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 $debug;
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$code .= "$ret $ident($params) $body\n\n";
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$has_main = 1 if $ident eq 'main';
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}
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$precode =~ s/^\s+//;
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$precode =~ s/\s+$//;
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$precode =~ s/^{(.*)}$/$1/s;
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if (not $has_main) {
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$code = "$prelude\n$code" . "int main(void) {\n$precode\n}\n";
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$nooutput = "No warnings, errors or output.";
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} else {
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print "code: [$code]; precode: [$precode]\n" if $debug;
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$code = "$prelude\n$precode\n\n$code\n";
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$nooutput = "No warnings, errors or output.";
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}
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} else {
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$code = $precode;
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}
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print "after func extract, code: [$code]\n" if $debug;
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$code =~ s/\|n/\n/g;
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$code =~ s/^\s+//;
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$code =~ s/\s+$//;
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$code =~ s/(\{|})\n\s*;\n/$1\n/gs;
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$code =~ s/(?:\n\n)+/\n\n/g;
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print "final code: [$code]\n" if $debug;
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open my $fh, ">prog.c" or die "Couldn't write prog.c: $!";
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print $fh $code;
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close $fh;
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my ($ret, $result) = execute(2, "bash -c \"ulimit -t 1; gcc -E -ftrack-macro-expansion=0 prog.c\"");
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$result =~ s/.*# \d+ "prog.c"(\s+\d+)*//ms;
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$result =~ s/^#.*$//gm;
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$result =~ s/[\n\r]/ /gm;
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$result =~ s/\s+/ /gm;
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print "result: [$result]\n" if $debug;
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if (not $has_main) {
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$result =~ s/\s*int main\(void\) \{//;
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$result =~ s/\s*\}\s*$//;
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}
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$output = length $result ? $result : $nooutput;
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print "$output\n";
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sub execute {
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my $timeout = shift @_;
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my ($cmdline) = @_;
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my ($ret, $result);
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($ret, $result) = eval {
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print "eval\n" if $debug;
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my $result = '';
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my $pid = open(my $fh, '-|', "$cmdline 2>&1");
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local $SIG{ALRM} = sub { print "Time out\n" if $debug; kill 'TERM', $pid; die "$result [Timed-out]\n"; };
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alarm($timeout);
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while (my $line = <$fh>) { $result .= $line; }
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close $fh;
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my $ret = $? >> 8;
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alarm 0;
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return ($ret, $result);
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};
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print "done eval\n" if $debug;
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alarm 0;
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if ($@ =~ /Timed-out/) { return (-1, $@); }
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print "[$ret, $result]\n" if $debug;
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return ($ret, $result);
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}
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