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Pass0.pm
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package Pass0;
#
## ABSTRACT: Initial source code scanner for pythonizer
## Reads thru and tokenizes the code and determines if this is
## a self-contained module or not. If it's self-contained,
## it turns on the '-m' (make global variables into 'my' variables)
## which makes the generated python code easier to read, as
## global variables in python are file-scoped, where in perl they
## are truly global across files.
## Also handles "# pragma pythonizer -flags" and "# pragma pythonizer options"
use v5.10.1;
use warnings;
use strict 'subs';
use Perlscan qw(tokenize $TokenStr @ValClass @ValPerl @ValPy @ValType);
use Pyconfig;
use open qw(:std :utf8);
require Exporter;
our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
@ISA = qw(Exporter);
@EXPORT = qw(pass_0 %line_no_convert_regex);
$say_why = 0;
@implied_options = ();
%line_no_convert_regex = ();
sub pass_0
{
my $line;
my $use_implicit_my = undef;
my $looks_like_script = 0;
my $CurSub = '__main__';
my $lines_in_main = 0;
my $lines_in_subs = 0;
my $global_init_lines = 0;
my %FileHandlesOpened = ();
my %FileHandlesClosed = ();
my %ConstantVars = ();
$say_why = (&Softpano::get_verbosity() >= 1);
$extra_info = (&Softpano::get_verbosity() >= 3);
while(1) {
$line = &Pythonizer::getline();
last unless(defined($line));
say STDERR "\n === Pass0: Line-$. Perl source:".$line."===" if($::debug >= 6);
next if(defined $use_implicit_my);
&Perlscan::tokenize($line);
unless(defined($ValClass[0])){
next;
}
#say STDERR "=|$TokenStr|= $line (@ValPerl)";
if($CurSub eq '__main__') {
$lines_in_main++;
if($#ValClass >= 2 && $ValClass[0] =~ /[ahsG]/ && $ValClass[1] eq '=' &&
is_constant_expr(2, $#ValClass, \%ConstantVars)) {
$global_init_lines++;
$ConstantVars{$ValPerl[0]} = 1;
} elsif($ValClass[0] eq 'd') {
$global_init_lines++;
}
} else {
$lines_in_subs++;
}
if($#ValClass >= 2 && $ValClass[0] eq 'i' && $ValPerl[0] eq 'pragma' && $ValPerl[1] eq 'pythonizer') {
my $uim = handle_pragma_pythonizer();
$use_implicit_my = $uim if(defined $uim);
} elsif($ValClass[0] eq 'c' && $ValPerl[0] eq 'package') {
$use_implicit_my = 0;
say STDERR "Using -M due to package" if($say_why);
} elsif($ValClass[0] eq 'k' && $ValPerl[0] eq 'sub') {
$global_init_lines++;
$CurSub = $ValPerl[1];
if(index($ValPy[1], '.') != -1) { # issue s320
$use_implicit_my = 0; # issue s320
say STDERR "Using -M due to sub with fully qualified name $CurSub" if($say_why); # issue s320
} # issue s320
} elsif($ValClass[0] eq 'k' && $ValPerl[0] eq 'require' && $#ValClass >= 1) {
if($ValClass[1] eq 's' || $ValClass[1] eq '"') {
$use_implicit_my = 0;
say STDERR "Using -M due to require" if($say_why);
}
} elsif($ValClass[0] eq 'k' && $ValPerl[0] eq 'use' && $#ValClass >= 1 && $ValPerl[1] eq 'Env') { # use Env
$use_implicit_my = 0; # use Env
say STDERR "Using -M due to use Env" if($say_why); # use Env
} elsif($ValClass[0] eq 'k' && $ValPerl[0] eq 'return' && $CurSub eq '__main__' &&
!&Perlscan::in_eval()) {
$use_implicit_my = 0; # will die if in a script
say STDERR "Using -M due to return not in sub" if($say_why);
} elsif(($ValClass[0] =~ m'[*@%&$]' || ($ValClass[0] eq 's' && $ValPerl[0] =~ m'^[*@%&$]$')) &&
3 <= $#ValClass && $ValClass[1] eq '(' &&
$ValPerl[1] eq '{' && contains_colon_colon(2, &Pythonizer::matching_br(1)-1)) { # issue s244
$use_implicit_my = 0; # issue s244
say STDERR "Using -M due to dynamic package" if($say_why); # issue s244
} elsif($ValClass[0] eq '{') {
&Pythonizer::correct_nest(1);
} elsif($ValClass[0] eq '}' && $#ValClass == 0) {
&Pythonizer::correct_nest(-1);
if($CurSub ne '__main__' && $Pythonizer::NextNest == 0) {
$CurSub = '__main__';
}
} elsif($ValClass[0] eq 'f' && $ValPerl[0] eq 'print' && $Pythonizer::NextNest == 0 &&
(scalar(@ValClass) == 1 || (($fh=$ValPerl[1]) =~ /^STD/ || $ValClass[1] =~ /[s+"]/) ||
($ValClass[1] eq '(' && ($#ValClass >=2 && ($fh=$ValPerl[2]) =~ /^STD/ || $ValClass[2] =~ /[s+"]/)))) {
my $conditional = 0;
for(my $i = 2; $i <= $#ValClass; $i++) {
if($ValClass[$i] eq 'c') {
$conditional = 1;
last;
}
}
if(scalar(@ValClass) > 1 && $fh =~ /^STD/ && exists $FileHandlesOpened{$fh}) {
$conditional = 1; # No good if they change STDxxx to some other file
}
$prints_to_stdout_stderr = 1 unless($conditional);
} else {
for(my $i = 0; $i <= $#ValClass; $i++) {
if($ValClass[$i] eq 'k' && $ValPerl[$i] eq 'require' && $i+1 <= $#ValClass) {
if($ValClass[$i+1] eq 's' || $ValClass[$i+1] eq '"') {
$use_implicit_my = 0;
say STDERR "Using -M due to require" if($say_why);
last;
}
} elsif($ValClass[$i] eq 'f' && $ValPerl[$i] eq 'GetOptions') {
$looks_like_script = 1;
} elsif($ValClass[$i] eq 'f' && $ValPerl[$i] eq 'shift' &&
$CurSub eq '__main__' && $i == $#ValClass) { # Shift of @ARGV
$looks_like_script = 1;
} elsif($ValClass[$i] eq 'f' && $ValPerl[$i] eq 'open') {
if($ValClass[$i+1] eq 'i') {
$FileHandlesOpened{$ValPerl[$i+1]} = 1;
} elsif($ValClass[$i+1] eq '(' && $ValClass[$i+2] eq 'i') {
$FileHandlesOpened{$ValPerl[$i+2]} = 1;
}
} elsif($ValClass[$i] eq 'f' && $ValPerl[$i] eq 'close') {
if($ValClass[$i+1] eq 'i') {
$FileHandlesClosed{$ValPerl[$i+1]} = 1;
} elsif($ValClass[$i+1] eq '(' && $ValClass[$i+2] eq 'i') {
$FileHandlesClosed{$ValPerl[$i+2]} = 1;
}
} elsif($ValClass[$i] eq 's' && $ValPerl[$i] eq '$ARGV' &&
$i+1 <= $#ValClass && $ValPerl[$i+1] eq '[') {
$looks_like_script = 1;
} elsif($ValClass[$i] eq 'a' && $ValPerl[$i] eq '@ARGV') {
$looks_like_script = 1;
} elsif($ValClass[$i] eq 'f' && $ValPerl[$i] eq 'tie') { # issue s301
my $j = $i+1;
$j++ if($ValClass[$i] eq 't');
if($ValClass[$j] eq 's') { # Tie scalar
$use_implicit_my = 0;
say STDERR "Using -M due to tie scalar" if($say_why);
last;
}
} elsif($ValClass[$i] eq 'f' && $ValPy[$i] eq '_set_signal') { # issue s336
$use_implicit_my = 0;
say STDERR "Using -M due to set %SIG" if($say_why);
last;
}
}
}
}
return $use_implicit_my if(defined $use_implicit_my);
# example: cmt/dcEnding.pl has just "close LOG; exit;"
for my $fh (keys %FileHandlesClosed) {
if(!exists $FileHandlesOpened{$fh}) {
$use_implicit_my = 0;
say STDERR "Using -M due to close without open" if($say_why);
last;
}
}
return $use_implicit_my if(defined $use_implicit_my);
# Apply heuristics at this point, leaning towards setting $use_implicit_my to 0:
if(!$lines_in_main) {
$use_implicit_my = 0;
say STDERR "Using -M due to no lines in main" if($say_why);
} elsif($global_init_lines == $lines_in_main) {
$use_implicit_my = 0;
say STDERR "Using -M due to all of the lines in main are static inits" if($say_why);
} elsif($lines_in_main > 4 && $global_init_lines > $lines_in_main * 0.9) {
# Over 90% of the code is static inits
$use_implicit_my = 0;
say STDERR "Using -M due to >= 90% of lines in main are static inits" if($say_why);
} elsif($prints_to_stdout_stderr) {
$use_implicit_my = 1;
push @implied_options, '-m';
say STDERR "Using -m due to unconditional print to STDOUT/STDERR" if($say_why);
} elsif($looks_like_script) { # Check this last
$use_implicit_my = 1;
push @implied_options, '-m';
say STDERR "Using -m due to looks_like_script (GetOptions/ARGV)" if($say_why);
}
if($say_why and !defined $use_implicit_my) {
if($extra_info) {
say STDERR "Using -M: heuristics are indeterminate (lines in main: $lines_in_main, lines in subs: $lines_in_subs, global init lines: $global_init_lines)";
} else {
say STDERR "Using -M: heuristics are indeterminate";
}
}
return $use_implicit_my;
}
sub is_constant_expr
# Return 1 if this is a constant expression
{
my $start = shift;
my $end_pos = shift;
my $constant_vars = shift;
for(my $i=$start; $i <= $end_pos; $i++) {
$vc = $ValClass[$i];
next if($vc eq '(' || $vc eq ')' || $vc eq ',' || $vc eq 'A'); # punctuation
next if($vc eq '"' || $vc eq 'd' || $vc eq 'q');
next if($vc eq 's' && exists $constant_vars->{$ValPerl[$i]});
#say STDERR "is_constant_expr(=|$TokenStr|=) = 0";
return 0;
}
#say STDERR "is_constant_expr(=|$TokenStr|=) = 1";
return 1;
}
sub handle_pragma_pythonizer
# process the pragma pythonizer, setting appropriate global flags. Returns the
# value of the -m/-M flag if any.
{
my $mFlag = undef;
my $MFlag = undef;
my $SFlag = undef;
my $PFlag = undef;
my $NFlag = undef; # issue s132
my $UFlag = undef;
my $KFlag = undef;
my $YFlag = undef;
my $FFlag = undef; # issue s284
my $v0Flag = undef;
my $v1Flag = undef;
my $v2Flag = undef;
my $v3Flag = undef;
my $implicit_global_my = undef;
my %flags = (T=>\$::traceback, A=>\$::autodie, m=>\$mFlag, M=>\$MFlag, s=>\$::pythonize_standard_library,
n=>\$::trace_run, k=>\$::black, K=>\$KFlag, u=>\$::replace_usage, U=>\$UFlag,
a=>\$::gen_author, # issue s19
y=>\$::replace_run, Y=>\$YFlag, # issue s87
f=>\$::fully_qualify_calls, F=>\$FFlag, # issue s284
e=>\$Pythonizer::e_option, # issue s70
v0=>\$v0Flag, v1=>\$v1Flag, v2=>\$v2Flag, v3=>\$v3Flag,
S=>\$SFlag, p=>$::import_perllib, P=>\$PFlag, N=>\$NFlag); # issue s132
my %options = (traceback=>\$::traceback, autodie=>\$::autodie, implicit=>\$implicit_global_my,
pythonize=>\$::pythonize_standard_library, import=>\$::import_perllib,
trace=>\$::trace_run, black=>\$::black, replace=>\$::replace_usage,
pl_to_py=>\$::replace_run,
fully=>\$::fully_qualify_calls, # issue s284
author=>\$::gen_author, # issue s19
verbose=>\$v2Flag,
verbosity=>\$v2Flag,
convert=>undef, # issue s64
encoding=>\$Pythonizer::e_option, # issue s70
autovivification=>\$::autovivification);
my $set_option_from_flag = sub { # issue bootstrap
my ($flag, $val) = @_;
if($flag eq 'T') {
$::traceback = $val;
} elsif($flag eq 'A') {
$::autodie = $val;
} elsif($flag eq 'a') { # issue s19
$::gen_author = $val; # issue s19
} elsif($flag eq 'e') { # issue s70
$Pythonizer::e_option = $val; # issue s70
} elsif($flag eq 'm') {
$mFlag = $val;
} elsif($flag eq 'M') {
$MFlag = $val;
} elsif($flag eq 's') {
$::pythonize_standard_library = $val;
} elsif($flag eq 'n') {
$::trace_run = $val;
} elsif($flag eq 'k') {
$::black = $val;
} elsif($flag eq 'K') {
$KFlag = $val;
} elsif($flag eq 'u') {
$::replace_usage = $val;
} elsif($flag eq 'U') {
$UFlag = $val;
} elsif($flag eq 'f') { # issue s274
$::fully_qualify_calls = $val; # issue s274
} elsif($flag eq 'F') { # issue s274
$FFlag = $val; # issue s274
} elsif($flag eq 'y') { # issue s87
$::replace_run = $val; # issue s87
} elsif($flag eq 'Y') { # issue s87
$YFlag = $val; # issue s87
} elsif($flag eq 'S') {
$SFlag = $val;
} elsif($flag eq 'p') {
$::import_perllib = $val;
} elsif($flag eq 'P') {
$PFlag = $val;
} elsif($flag eq 'N') { # issue s132
$NFlag = $val; # issue s132
} elsif($flag eq 'v0') {
$v0Flag = $val;
} elsif($flag eq 'v1') {
$v1Flag = $val;
} elsif($flag eq 'v2') {
$v2Flag = $val;
} elsif($flag eq 'v3') {
$v3Flag = $val;
}
};
my %option_flags = (traceback=>'T', autodie=>'A', implicit=>'m', trace=>'n', black=>'k',
author=>'a', # issue s19
pl_to_py=>'y', # issue s87
fully=>'f', # issue s284
encoding=>'e', # issue s70
verbose=>'v2', verbosity=>'v2',
pythonize=>'s', import=>'p', replace=>'u');
my %option_no_flags = (implicit=>'M', pythonize=>'S', import=>'P', autovivification=>'N', black=>'K', replace=>'U', # issue s132
pl_to_py=>'Y', # issue s87
fully=>'F', # issue s284
verbose=>'v0', verbosity=>'v0',
convert=>undef, # issue s64 - use special processing
);
my %flag_has_arg = (e=>1); # issue s70
# pragma pythonizer -flags -moreflags -e input_encoding,output_encoding
# pragma pythonizer implicit global my, traceback, no import perllib, trace run, encoding input_encoding, output_encoding
for(my $i=2; $i <= $#ValClass; $i++) {
if($ValClass[$i] eq 'i') {
$vp = $ValPerl[$i];
if($ValPerl[$i-1] eq '-') { # flags
for my $flag (keys %flags) {
if($vp =~ /$flag/) {
#${$flags{$flag}} = 1;
my $val = 1; # issue s70
if(exists $flag_has_arg{$flag}) { # issue s70
$val = get_arg($i); # Modifies $i
say STDERR "Using -$flag $val due to pragma pythonizer -$vp $val" if($say_why);
push @implied_options, "-$flag", $val;
} else {
say STDERR "Using -$flag due to pragma pythonizer -$vp" if($say_why);
push @implied_options, "-$flag";
}
&$set_option_from_flag($flag, $val); # issue s70
}
}
} else {
for my $option (keys %options) {
if($vp =~ /^$option$/i) {
if($ValPerl[$i-1] eq 'no') {
#${$options{$option}} = 0;
if(exists $option_no_flags{$option}) {
$flag = $option_no_flags{$option};
if(defined $flag) {
&$set_option_from_flag($flag, 1);
say STDERR "Using -$flag due to pragma pythonizer no $vp" if($say_why);
push @implied_options, "-$flag";
} else { # issue s64: special processing
$line_no_convert_regex{$. + 1} = 1;
say STDERR "Not converting perl to python regex on line " . ($.+1) . " due to pragma pythonizer" if($say_why)
}
}
} else {
#${$options{$option}} = 1;
if(exists $option_flags{$option}) {
$flag = $option_flags{$option};
my $val = 1; # issue s70
if(exists $flag_has_arg{$flag}) { # issue s70
$val = get_arg($i); # Modifies $i
say STDERR "Using -$flag $val due to pragma pythonizer $vp $val" if($say_why);
push @implied_options, "-$flag", $val;
} else {
say STDERR "Using -$flag due to pragma pythonizer $vp" if($say_why);
push @implied_options, "-$flag";
}
&$set_option_from_flag($flag, $val); # issue s70
}
}
}
}
}
}
}
$::pythonize_standard_library = 0 if($SFlag);
$::import_perllib = 0 if($PFlag);
$::autovivification = 0 if($NFlag); # issue s132
$::replace_usage = 0 if($UFlag);
$::replace_run = 0 if($YFlag); # issue s87
$::fully_qualify_calls = 0 if($FFlag); # issue s284
$::black = 0 if($KFlag);
&Softpano::set_verbosity(0) if($v0Flag);
&Softpano::set_verbosity(1) if($v1Flag);
&Softpano::set_verbosity(2) if($v2Flag);
&Softpano::set_verbosity(3) if($v3Flag);
return 1 if($mFlag);
return 0 if($MFlag);
return $implicit_global_my if(defined $implicit_global_my);
return undef;
}
sub get_arg # issue s70
# Get argument from option or flag
# arg: $i = position of flag or option - gets updated to point to the last argument
# returns: the argument as a string value
{
my $pos = $_[0];
my $i = $pos+1;
my $result = '';
for(; $i <= $#ValClass; $i++) {
if($ValClass[$i] eq 'i') {
last if($result && $result !~ /,$/); # Get out if this is the next option
$result .= $ValPy[$i];
} elsif($ValClass[$i] eq '-') { # e.g. cp-1252 gets split into cp(i), -(-), 1252(d)
$result .= '-';
} elsif($ValClass[$i] eq 'd') {
$result .= $ValPy[$i];
} elsif($ValClass[$i] eq ',') {
$result .= ',';
} else {
last;
}
}
$_[0] = $i-1; # Update the loop counter in the caller
say STDERR "get_arg($pos) = '$result' and updates $pos to $_[0]" if $::debug >= 6;
return $result;
}
sub contains_colon_colon # issue s244
# Do these tokens contain a string with '::' in it?
{
my ($pos, $end_pos) = @_;
for(; $pos <= $end_pos; $pos++) {
return 1 if($ValClass[$pos] eq '"' && index($ValPy[$pos], '::') != -1);
}
return 0;
}
1;