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pbot/applets/c2english.pl

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#!/usr/bin/env perl
# SPDX-FileCopyrightText: 2014-2023 Pragmatic Software <pragma78@gmail.com>
# SPDX-License-Identifier: MIT
use warnings;
use strict;
use Text::Balanced qw(extract_codeblock extract_delimited extract_bracketed);
use feature 'switch';
no if $] >= 5.018, warnings => 'experimental::smartmatch';
my $debug = 0;
my $code = join ' ', @ARGV;
if (not length $code) {
print "Usage: english <any C11 code>\n";
exit;
}
my $output;
my $force;
if ($code =~ s/^-f\s+//) { $force = 1; }
my ($has_function, $has_main, $got_nomain);
my $prelude_base =
"#define _XOPEN_SOURCE 9001\n#define __USE_XOPEN\n#include <stdio.h>\n#include <stdlib.h>\n#include <string.h>\n#include <unistd.h>\n#include <math.h>\n#include <limits.h>\n#include <sys/types.h>\n#include <stdint.h>\n#include <errno.h>\n#include <ctype.h>\n#include <assert.h>\n#include <stdnoreturn.h>\n#include <stdbool.h>\n#include <stdalign.h>\n#include <time.h>\n#include <stddef.h>\n#include <uchar.h>\n#define _Atomic\n#define _Static_assert(a, b)\n\n";
my $prelude = $prelude_base;
print "code before: [$code]\n" if $debug;
# replace \n outside of quotes with literal newline
my $new_code = "";
use constant {
NORMAL => 0,
DOUBLE_QUOTED => 1,
SINGLE_QUOTED => 2,
};
my $state = NORMAL;
my $escaped = 0;
while ($code =~ m/(.)/gs) {
my $ch = $1;
given ($ch) {
when ('\\') {
if ($escaped == 0) {
$escaped = 1;
next;
}
}
if ($state == NORMAL) {
when ($_ eq '"' and not $escaped) { $state = DOUBLE_QUOTED; }
when ($_ eq "'" and not $escaped) { $state = SINGLE_QUOTED; }
when ($_ eq 'n' and $escaped == 1) {
$ch = "\n";
$escaped = 0;
}
}
if ($state == DOUBLE_QUOTED) {
when ($_ eq '"' and not $escaped) { $state = NORMAL; }
}
if ($state == SINGLE_QUOTED) {
when ($_ eq "'" and not $escaped) { $state = NORMAL; }
}
}
$new_code .= '\\' and $escaped = 0 if $escaped;
$new_code .= $ch;
}
$code = $new_code;
print "code after \\n replacement: [$code]\n" if $debug;
my $single_quote = 0;
my $double_quote = 0;
my $parens = 0;
$escaped = 0;
my $cpp = 0; # preprocessor
while ($code =~ m/(.)/msg) {
my $ch = $1;
my $pos = pos $code;
print "adding newlines, ch = [$ch], parens: $parens, cpp: $cpp, single: $single_quote, double: $double_quote, escaped: $escaped, pos: $pos\n" if $debug >= 10;
if ($ch eq '\\') { $escaped = not $escaped; }
elsif ($ch eq '#' and not $cpp and not $escaped and not $single_quote and not $double_quote) {
$cpp = 1;
if ($code =~ m/include\s*[<"]([^>"]*)[>"]/msg) {
my $match = $1;
$pos = pos $code;
substr($code, $pos, 0) = "\n";
pos $code = $pos;
$cpp = 0;
} else {
pos $code = $pos;
}
} elsif ($ch eq '"') {
$double_quote = not $double_quote unless $escaped or $single_quote;
$escaped = 0;
} elsif ($ch eq '(' and not $single_quote and not $double_quote) {
$parens++;
} elsif ($ch eq ')' and not $single_quote and not $double_quote) {
$parens--;
$parens = 0 if $parens < 0;
} elsif ($ch eq ';' and not $cpp and not $single_quote and not $double_quote and $parens == 0) {
if (not substr($code, $pos, 1) =~ m/[\n\r]/) {
substr($code, $pos, 0) = "\n";
pos $code = $pos + 1;
}
} elsif ($ch eq "'") {
$single_quote = not $single_quote unless $escaped or $double_quote;
$escaped = 0;
} elsif ($ch eq 'n' and $escaped) {
if (not $single_quote and not $double_quote) {
print "added newline\n" if $debug >= 10;
substr($code, $pos - 2, 2) = "\n";
pos $code = $pos;
$cpp = 0;
}
$escaped = 0;
} elsif ($ch eq '{' and not $cpp and not $single_quote and not $double_quote) {
if (not substr($code, $pos, 1) =~ m/[\n\r]/) {
substr($code, $pos, 0) = "\n";
pos $code = $pos + 1;
}
} elsif ($ch eq '}' and not $cpp and not $single_quote and not $double_quote) {
if (not substr($code, $pos, 1) =~ m/[\n\r;]/) {
substr($code, $pos, 0) = "\n";
pos $code = $pos + 1;
}
} elsif ($ch eq "\n" and $cpp and not $single_quote and not $double_quote) {
$cpp = 0;
} else {
$escaped = 0;
}
}
print "code after \\n additions: [$code]\n" if $debug;
# white-out contents of quoted literals
my $white_code = $code;
$white_code =~ s/(?:\"((?:\\\"|(?!\").)*)\")/'"' . ('-' x length $1) . '"'/ge;
$white_code =~ s/(?:\'((?:\\\'|(?!\').)*)\')/"'" . ('-' x length $1) . "'"/ge;
my $precode;
if ($white_code =~ m/#include/) { $precode = $code; }
else { $precode = $prelude . $code; }
$code = '';
my $warn_unterminated_define = 0;
print "--- precode: [$precode]\n" if $debug;
my $lang = 'C89';
if ($lang eq 'C89' or $lang eq 'C99' or $lang eq 'C11' or $lang eq 'C++') {
my $prelude = '';
while ($precode =~ s/^\s*(#.*\n{1,2})//g) { $prelude .= $1; }
if ($precode =~ m/^\s*(#.*)/ms) {
my $line = $1;
if ($line !~ m/\n/) { $warn_unterminated_define = 1; }
}
print "*** prelude: [$prelude]\n precode: [$precode]\n" if $debug;
my $preprecode = $precode;
# white-out contents of quoted literals
$preprecode =~ s/(?:\"((?:\\\"|(?!\").)*)\")/'"' . ('-' x length $1) . '"'/ge;
$preprecode =~ s/(?:\'((?:\\\'|(?!\').)*)\')/"'" . ('-' x length $1) . "'"/ge;
# strip C and C++ style comments
if ($lang eq 'C89') {
$preprecode =~ s#/\*[^*]*\*+([^/*][^*]*\*+)*/# #gs;
$preprecode =~ s#|//([^\\]|[^\n][\n]?)*?\n|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^/"'\\]*)#defined $2 ? $2 : ""#gse;
} else {
$preprecode =~ s#|//([^\\]|[^\n][\n]?)*?\n|("(\\.|[^"\\])*"|'(\\.|[^'\\])*'|.[^/"'\\]*)#defined $2 ? $2 : ""#gse;
$preprecode =~ s#/\*[^*]*\*+([^/*][^*]*\*+)*/# #gs;
}
print "preprecode: [$preprecode]\n" if $debug;
print "looking for functions, has main: $has_main\n" if $debug >= 2;
my $func_regex = qr/^([ *\w]+)\s+([ ()*\w]+)\s*\(([^;{]*)\s*\)\s*({.*|<%.*|\?\?<.*)/ims;
# look for potential functions to extract
while ($preprecode =~ /$func_regex/ms) {
my ($pre_ret, $pre_ident, $pre_params, $pre_potential_body) = ($1, $2, $3, $4);
print "looking for functions, found [$pre_ret][$pre_ident][$pre_params][$pre_potential_body], has main: $has_main\n" if $debug >= 1;
# find the pos at which this function lives, for extracting from precode
$preprecode =~ m/(\Q$pre_ret\E\s+\Q$pre_ident\E\s*\(\s*\Q$pre_params\E\s*\)\s*\Q$pre_potential_body\E)/g;
my $extract_pos = (pos $preprecode) - (length $1);
# now that we have the pos, substitute out the extracted potential function from preprecode
$preprecode =~ s/$func_regex//ms;
# create tmpcode object that starts from extract pos, to skip any quoted code
my $tmpcode = substr($precode, $extract_pos);
print "tmpcode: [$tmpcode]\n" if $debug;
$precode = substr($precode, 0, $extract_pos);
print "precode: [$precode]\n" if $debug;
$tmpcode =~ m/$func_regex/ms;
my ($ret, $ident, $params, $potential_body) = ($1, $2, $3, $4);
print "1st extract: [$ret][$ident][$params][$potential_body]\n" if $debug;
$ret =~ s/^\s+//;
$ret =~ s/\s+$//;
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") {
$precode .= "$ret $ident ($params) $potential_body";
next;
} else {
$tmpcode =~ s/$func_regex//ms;
}
$potential_body =~ s/^\s*<%/{/ms;
$potential_body =~ s/%>\s*$/}/ms;
$potential_body =~ s/^\s*\?\?</{/ms;
$potential_body =~ s/\?\?>$/}/ms;
my @extract = extract_bracketed($potential_body, '{}');
my $body;
if (not defined $extract[0]) {
if ($debug == 0) { print "error: unmatched brackets\n"; }
else {
print "error: unmatched brackets for function '$ident';\n";
print "body: [$potential_body]\n";
}
exit;
} else {
$body = $extract[0];
$preprecode .= $extract[1];
$precode .= $extract[1];
}
print "final extract: [$ret][$ident][$params][$body]\n" if $debug;
$code .= "$ret $ident($params) $body\n\n";
$has_main = 1 if $ident =~ m/^\s*\(?\s*main\s*\)?\s*$/;
$has_function = 1;
}
$precode =~ s/^\s+//;
$precode =~ s/\s+$//;
$precode =~ s/^{(.*)}$/$1/s;
if (not $has_main and not $got_nomain) { $code = "$prelude\n$code" . "int main(void) {\n$precode\n;\n}\n"; }
else {
print "code: [$code]; precode: [$precode]\n" if $debug;
$code = "$prelude\n$precode\n\n$code\n";
}
} else {
$code = $precode;
}
print "after func extract, code: [$code]\n" if $debug;
$code =~ s/\|n/\n/g;
$code =~ s/^\s+//;
$code =~ s/\s+$//;
$code =~ s/;\s*;\n/;\n/gs;
$code =~ s/(;)?(\s*\/\*.*?\*\/\s*);\n/$1$2/gs;
$code =~ s/(;)?(\s*\/\/.*?\s*);\n/$1$2/gs;
$code =~ s/({|})\n\s*;\n/$1\n/gs;
$code =~ s/(?:\n\n)+/\n\n/g;
print "final code: [$code]\n" if $debug;
chdir "c2english" or die "Could not chdir: $!";
open my $fh, '>', 'code.c' or die "Could not write code: $!";
print $fh $code;
close $fh;
#my ($ret, $result) = execute(10, "gcc -std=c89 -pedantic -Werror -Wno-unused -fsyntax-only -fno-diagnostics-show-option -fno-diagnostics-show-caret code.c");
my ($ret, $result) =
execute(10, "ulimit -t 2; gcc -std=c11 -pedantic -Werror -Wno-implicit -Wno-unused -fsyntax-only -fno-diagnostics-show-option -fno-diagnostics-show-caret code.c");
if (not $force and $ret != 0) {
$output = $result;
#print STDERR "output: [$output]\n";
$output =~ s/\s*In file included from\s+.*?:\d+:\d+:\s*//g;
$output =~ s/code\.c:\d+:\d+://g;
$output =~ s/code\.c://g;
$output =~ s/error=edantic/error=pedantic/g;
$output =~ s/(\d+:\d+:\s*)*cc1: all warnings being treated as errors//;
$output =~ s/(\d+:\d+:\s*)* \(first use in this function\)//g;
$output =~ s/(\d+:\d+:\s*)*error: \(Each undeclared identifier is reported only once.*?\)//msg;
$output =~ s/(\d+:\d+:\s*)*ld: warning: cannot find entry symbol _start; defaulting to [^ ]+//;
#$output =~ s/(\d+:\d+:\s*)*error: (.*?) error/error: $1; error/msg;
$output =~ s/(\d+:\d+:\s*)*\/tmp\/.*\.o://g;
$output =~ s/(\d+:\d+:\s*)*collect2: ld returned \d+ exit status//g;
$output =~ s/\(\.text\+[^)]+\)://g;
$output =~ s/\[ In/[In/;
$output =~ s/(\d+:\d+:\s*)*warning: Can't read pathname for load map: Input.output error.//g;
my $left_quote = chr(226) . chr(128) . chr(152);
my $right_quote = chr(226) . chr(128) . chr(153);
$output =~ s/$left_quote/'/msg;
$output =~ s/$right_quote/'/msg;
$output =~ s/`/'/msg;
$output =~ s/\t/ /g;
$output =~ s/(\d+:\d+:\s*)*\s*In function .main.:\s*//g;
$output =~
s/(\d+:\d+:\s*)*warning: unknown conversion type character 'b' in format \[-Wformat\]\s+(\d+:\d+:\s*)*warning: too many arguments for format \[-Wformat-extra-args\]/info: %b is a candide extension/g;
$output =~ s/(\d+:\d+:\s*)*warning: unknown conversion type character 'b' in format \[-Wformat\]//g;
$output =~ s/\s\(core dumped\)/./;
# $output =~ s/\[\s+/[/g;
$output =~ s/ \[enabled by default\]//g;
$output =~ s/initializer\s+warning: \(near/initializer (near/g;
$output =~ s/(\d+:\d+:\s*)*note: each undeclared identifier is reported only once for each function it appears in//g;
$output =~ s/\(gdb\)//g;
$output =~ s/", '\\(\d{3})' <repeats \d+ times>,? ?"/\\$1/g;
$output =~ s/, '\\(\d{3})' <repeats \d+ times>\s*//g;
$output =~ s/(\\000)+/\\0/g;
$output =~ s/\\0[^">']+/\\0/g;
$output =~ s/= (\d+) '\\0'/= $1/g;
$output =~ s/\\0"/"/g;
$output =~ s/"\\0/"/g;
$output =~ s/\.\.\.>/>/g;
# $output =~ s/(\\\d{3})+//g;
$output =~ s/<\s*included at \/home\/compiler\/>\s*//g;
$output =~ s/\s*compilation terminated due to -Wfatal-errors\.//g;
$output =~ s/^======= Backtrace.*\[vsyscall\]\s*$//ms;
$output =~ s/glibc detected \*\*\* \/home\/compiler\/code: //;
$output =~ s/: \/home\/compiler\/code terminated//;
$output =~ s/<Defined at \/home\/compiler\/>/<Defined at \/home\/compiler\/code.c:0>/g;
$output =~ s/\s*In file included from\s+\/usr\/include\/.*?:\d+:\d+:\s*/, /g;
$output =~ s/\s*collect2: error: ld returned 1 exit status//g;
$output =~ s/In function\s*`main':\s*\/home\/compiler\/ undefined reference to/error: undefined reference to/g;
$output =~ s/\/home\/compiler\///g;
$output =~ s/compilation terminated.//;
$output =~ s/<'(.*)' = char>/<'$1' = int>/g;
$output =~ s/= (-?\d+) ''/= $1/g;
$output =~ s/, <incomplete sequence >//g;
$output =~ s/\s*error: expected ';' before 'return'//g;
$output =~ s/^\s+//;
$output =~ s/\s+$//;
$output =~ s/error: ISO C forbids nested functions\s+//g;
$output =~ s/\s*note: this is the location of the previous definition//g;
$output =~ s/\s*note: use option -std=c99 or -std=gnu99 to compile your code//g;
$output =~ s/\s*\(declared at .*?\)//g;
$output =~ s/, note: declared here//g;
$output =~ s#/usr/include/.*?.h:\d+:\d+:/##g;
$output =~ s/\s*error: storage size of.*?isn't known\s*//g;
$output =~ s/; did you mean '.*?'\?//g;
# don't error about undeclared objects
$output =~ s/error: '[^']+' undeclared\s*//g;
if (length $output) {
print "$output\n";
exit 0;
} else {
$output = undef;
}
}
$code =~ s/^\Q$prelude_base\E\s*//;
open $fh, '>', 'code2eng.c' or die "Could not write code: $!";
print $fh $code;
close $fh;
$output = `./c2eng.pl code2eng.c` if not defined $output;
if (not $has_function and not $has_main) {
$output =~ s/Let .main. be a function taking no arguments and returning int.\s*When called, the function will.\s*(do nothing.)?//i;
$output =~ s/\s*Return 0.\s*End of function .main..\s*//;
$output =~ s/\s*Finally, return 0.$//;
$output =~ s/\s*and then return 0.$/./;
$output =~ s/\s*Do nothing.\s*$//;
$output =~ s/^\s*(.)/\U$1/;
$output =~ s/\.\s+(\S)/. \U$1/g;
} elsif ($has_function and not $has_main) {
$output =~ s/\s*Let `main` be a function taking no arguments and returning int.\s*When called, the function will do nothing.//;
$output =~ s/\s*Finally, return 0.$//;
$output =~ s/\s*and then return 0.$/./;
}
$output =~ s/\s+/ /;
if (not $output) { $output = "Does not compute; I only understand valid C11 code.\n"; }
print "$output\n";
sub execute {
my $timeout = shift @_;
my ($cmdline) = @_;
my ($ret, $result);
($ret, $result) = eval {
my $result = '';
my $pid = open(my $fh, '-|', "$cmdline 2>&1");
local $SIG{ALRM} = sub { kill 'TERM', $pid; die "$result [Timed-out]\n"; };
alarm($timeout);
while (my $line = <$fh>) { $result .= $line; }
close $fh;
my $ret = $? >> 8;
alarm 0;
return ($ret, $result);
};
alarm 0;
if ($@ =~ /Timed-out/) { return (-1, $@); }
return ($ret, $result);
}
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