Lua: add script which wraps not-yet ported C functions to Lua

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21657 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 291 insertions, 0 deletions

diff --git a/apps/plugins/lua/rocklib_aux.pl b/apps/plugins/lua/rocklib_aux.pl
new file mode 100755
index 0000000000..b5de1e4544
--- /dev/null
+++ b/apps/plugins/lua/rocklib_aux.pl
@@ -0,0 +1,291 @@
+#!/usr/bin/env perl
+
+sub trim
+{
+    my $text = $_[0];
+    $text =~ s/^\s+//;
+    $text =~ s/\s+$//;
+    return $text;
+}
+
+sub rand_string
+{
+    my @chars=('a'..'z');
+    my $ret;
+    foreach (1..5) 
+    {
+        $ret .= $chars[rand @chars];
+    }
+    return $ret;
+}
+
+
+my @functions;
+my @ported_functions;
+my @forbidden_functions = ('^open$',
+                           '^close$',
+                           '^read$',
+                           '^write$',
+                           '^lseek$',
+                           '^ftruncate$',
+                           '^filesize$',
+                           '^fdprintf$',
+                           '^read_line$',
+                           '^[a-z]+dir$',
+                           '^__.+$',
+                           '^.+_(un)?cached$',
+                           '^audio_play$');
+
+my $rocklib = sprintf("%s/rocklib.c", $ARGV[0]);
+open ROCKLIB, "<$rocklib" or die("Couldn't open $rocklib: $!");
+while(<ROCKLIB>)
+{
+    if(/^RB_WRAP\(([^)]+)\)/)
+    {
+        push(@ported_functions, $1);
+    }
+}
+close ROCKLIB;
+
+# Parse plugin.h
+my $start = 0;
+while(<STDIN>)
+{
+    if(/struct plugin_api \{/)
+    {
+        $start = 1;
+    }
+    elsif($start && /\};/)
+    {
+        $start = 0;
+    }
+
+    if($start == 1)
+    {
+        my $line = $_;
+        while($line !~ /;/)
+        {
+            $line .= <STDIN>;
+        }
+
+        $line =~ s/(\n|\r)//g;
+
+        if($line =~ /([a-zA-Z *_]+)?\s?\(\*([^)]+)?\)\(([^)]+)\).*?;/)
+        {
+            $return_type = $1;
+            $name = $2;
+            $arguments = $3;
+
+            $return_type = trim($return_type);
+            $arguments =~ s/\s{2,}/ /g;
+
+            if( !grep($_ eq $name, @ported_functions) &&
+                !grep($name =~ $_, @forbidden_functions))
+            {
+                push(@functions, {'name' => $name, 'return' => $return_type, 'arg' => $arguments});
+            }
+        }
+    }
+}
+
+my $svnrev = '$Revision$';
+
+# Print the header
+print <<EOF
+/* Automatically generated of $svnrev from rocklib.c & plugin.h */
+
+#define lrocklib_c
+#define LUA_LIB
+
+#define _ROCKCONF_H_ /* We don't need strcmp() etc. wrappers */
+#include "lua.h"
+#include "lauxlib.h"
+#include "plugin.h"
+
+EOF
+;
+
+my %in_types = ('void' => \&in_void,
+                'int' => \&in_int,
+                'unsigned' => \&in_int,
+                'unsignedint' => \&in_int,
+                'signed' => \&in_int,
+                'signedint' => \&in_int,
+                'short' => \&in_int,
+                'unsignedshort' => \&in_int,
+                'signedshort' => \&in_int,
+                'long' => \&in_int,
+                'unsignedlong' => \&in_int,
+                'signedlong' => \&in_int,
+                'char' => \&in_int,
+                'unsignedchar' => \&in_int,
+                'signedchar' => \&in_int,
+                'char*' => \&in_string,
+                'signedchar*' => \&in_string,
+                'unsignedchar*' => \&in_string,
+                'bool' => \&in_bool,
+                '_Bool' => \&in_bool
+), %out_types = ('void' => \&out_void,
+                 'int' => \&out_int,
+                 'unsigned' => \&out_int,
+                 'unsignedint' => \&out_int,
+                 'signed' => \&out_int,
+                 'signedint' => \&out_int,
+                 'short' => \&out_int,
+                 'unsignedshort' => \&out_int,
+                 'signedshort' => \&out_int,
+                 'long' => \&out_int,
+                 'unsignedlong' => \&out_int,
+                 'signedlong' => \&out_int,
+                 'char' => \&out_int,
+                 'unsignedchar' => \&out_int,
+                 'signedchar' => \&out_int,
+                 'char*' => \&out_string,
+                 'signedchar*' => \&out_string,
+                 'unsignedchar*' => \&out_string,
+                 'bool' => \&out_bool,
+                 '_Bool' => \&out_bool
+);
+
+sub in_void
+{
+    return "\t(void)L;\n";
+}
+
+sub in_int
+{
+    my ($name, $type, $pos) = @_;
+    return sprintf("\t%s %s = (%s) luaL_checkint(L, %d);\n", $type, $name, $type, $pos);
+}
+
+sub in_string
+{
+    my ($name, $type, $pos) = @_;
+    return sprintf("\t%s %s = (%s) luaL_checkstring(L, %d);\n", $type, $name, $type, $pos)
+}
+
+sub in_bool
+{
+    my ($name, $type, $pos) = @_;
+    return sprintf("\tbool %s = luaL_checkboolean(L, %d);\n", $name, $pos)
+}
+
+sub out_void
+{
+    my $name = $_[0];
+    return sprintf("\t%s;\n\treturn 0;\n", $name);
+}
+
+sub out_int
+{
+    my ($name, $type) = @_;
+    return sprintf("\t%s result = %s;\n\tlua_pushinteger(L, result);\n\treturn 1;\n", $type, $name);
+}
+
+sub out_string
+{
+    my ($name, $type) = @_;
+    return sprintf("\t%s result = %s;\n\tlua_pushstring(L, result);\n\treturn 1;\n", $type, $name);
+}
+
+sub out_bool
+{
+    my ($name, $type) = @_;
+    return sprintf("\tbool result = %s;\n\tlua_pushboolean(L, result);\n\treturn 1;\n", $name);
+}
+
+# Print the functions
+my @valid_functions;
+foreach my $function (@functions)
+{
+    my $valid = 1, @arguments = ();
+    # Check for supported arguments
+    foreach my $argument (split(/,/, @$function{'arg'}))
+    {
+        $argument = trim($argument);
+        if($argument !~ /\[.+\]/ && ($argument =~ /^(.+[\s*])([^[*\s]*)/
+                                     || $argument eq "void"))
+        {
+            my $literal_type, $type, $name;
+            if($argument eq "void")
+            {
+                $literal_type = "void", $type = "void", $name = "";
+            }
+            else
+            {
+                $literal_type = trim($1), $name = trim($2), $type = trim($1);
+                $type =~ s/(\s|const)//g;
+
+                if($name eq "")
+                {
+                    $name = rand_string();
+                }
+            }
+
+            #printf "/* %s: %s|%s */\n", @$function{'name'}, $type, $name;
+            if(!defined $in_types{$type})
+            {
+                $valid = 0;
+                break;
+            }
+
+            push(@arguments, {'name' => $name,
+                              'type' => $type,
+                              'literal_type' => $literal_type
+                             });
+        }
+        else
+        {
+            $valid = 0;
+            break;
+        }
+    }
+
+    # Check for supported return value
+    my $return = @$function{'return'};
+    $return =~ s/(\s|const)//g;
+    #printf "/* %s: %s [%d] */\n", @$function{'name'}, $return, $valid;
+    if(!defined $out_types{$return})
+    {
+        $valid = 0;
+    }
+
+    if($valid == 1)
+    {
+        # Print the header
+        printf "static int rock_%s(lua_State *L)\n".
+            "{\n",
+            @$function{'name'};
+
+        # Print the arguments
+        my $i = 1;
+        foreach my $argument (@arguments)
+        {
+            print $in_types{@$argument{'type'}}->(@$argument{'name'}, @$argument{'literal_type'}, $i++);
+        }
+
+        # Generate the arguments string
+        my $func_args = $arguments[0]{'name'};
+        for(my $i = 1; $i < $#arguments + 1; $i++)
+        {
+            $func_args .= ", ".$arguments[$i]{'name'};
+        }
+        
+        # Print the function call
+        my $func = sprintf("rb->%s(%s)", @$function{'name'}, $func_args);
+
+        # Print the footer
+        print $out_types{$return}->($func, @$function{'return'});
+        print "}\n\n";
+
+        push(@valid_functions, $function);
+    }
+}
+
+# Print the C array
+print "const luaL_Reg rocklib_aux[] =\n{\n";
+foreach my $function (@valid_functions)
+{
+    printf "\t{\"%s\", rock_%s},\n", @$function{'name'}, @$function{'name'};
+}
+print "\t{NULL, NULL}\n};\n\n";