###################################################
# Samba4 parser generator for swig wrappers
# Copyright tpot@samba.org 2004
# released under the GNU GPL

package IdlSwig;

use strict;

# Some build farm machines don't have the Data::Dumper module installed

eval("use Data::Dumper");

# Display properties of a structure field as commented out code

sub DebugField($)
{
    my($e) = shift;
    my($result) = "";

    $result .= "\t// $e->{TYPE} $e->{NAME} ";

    $result .= "(scalar) " 
	if util::is_scalar_type($e->{TYPE});

    $result .= "pointers=$e->{POINTERS} " 
	if $e->{POINTERS} > 0;

    my($size_is) = util::has_property($e, "size_is");
    $result .= "size_is=" . $size_is . " " if $size_is;

    my($length_is) = util::has_property($e, "length_is");
    $result .= "length_is=" . $length_is . " " if $length_is;

    $result .= "array_len=" . $e->{ARRAY_LEN} . " " if $e->{ARRAY_LEN};

    $result .= "\n";

    return $result;
}

# Generate code to convert a Python object to an array

sub ArrayFromPython($$)
{
    my($e) = shift;
    my($prefix) = shift;
    my($result) = "";

    my($array_len) = $e->{ARRAY_LEN};

    if ($array_len eq "*") {
	$array_len = util::has_property($e, "size_is");
    }

    if (!util::is_constant($array_len)) {
	$array_len = "s->$prefix$array_len";
    }

    my($type) = $e->{TYPE};

    if (!util::is_scalar_type($type)) {
	$type = "struct $type";
    }

    if (!util::is_constant($e->{ARRAY_LEN})) {
	$result .= "\ts->$prefix$e->{NAME} = talloc(mem_ctx, $array_len * sizeof($type));\n";
    }

    $result .= "\t{\n";

    $result .= "\t\tint i;\n\n";
    $result .= "\t\tfor (i = 0; i < $array_len; i++) {\n";
    if (util::is_scalar_type($e->{TYPE})) {
	$result .= "\t\t\ts->$prefix$e->{NAME}\[i\] = $e->{TYPE}_from_python(PyList_GetItem(PyDict_GetItem(obj, PyString_FromString(\"$e->{NAME}\")), i), \"$e->{NAME}\");\n";
    } else {
	$result .= "\t\t\t$e->{TYPE}_from_python(mem_ctx, &s->$prefix$e->{NAME}\[i\], PyList_GetItem(PyDict_GetItem(obj, PyString_FromString(\"$e->{NAME}\")), i), \"$e->{NAME}\");\n";
    }
    $result .= "\t\t}\n";

    $result .= "\t}\n";

    return $result;
}

# Generate code to convert a Python object to a structure field

sub FieldFromPython($$)
{
    my($e) = shift;
    my($prefix) = shift;
    my($result) = "";
    my($obj) = "PyDict_GetItem(obj, PyString_FromString(\"$e->{NAME}\"))";

    # Special cases

    if ($e->{TYPE} eq "string" && $e->{POINTERS} == 1) {
	$result .= "\ts->$prefix$e->{NAME} = string_ptr_from_python(mem_ctx, $obj, \"$e->{NAME}\");\n";
	return $result;
    }

    # Generate conversion for element
    
    if (util::is_scalar_type($e->{TYPE})) {
	if ($e->{POINTERS} == 0) {
	    if ($e->{ARRAY_LEN}) {
		$result .= ArrayFromPython($e, $prefix);
	    } else {
		$result .= "\ts->$prefix$e->{NAME} = $e->{TYPE}_from_python($obj, \"$e->{NAME}\");\n";
	    }
	} else {
	    $result .= "\t// Pointer to scalar\n";
	    $result .= DebugField($e);
	}
    } else {
	if ($e->{POINTERS} == 0) {
	    if ($e->{ARRAY_LEN}) {
		$result .= ArrayFromPython($e, $prefix);
	    } else {
		$result .= "\t$e->{TYPE}_from_python(mem_ctx, &s->$prefix$e->{NAME}, $obj, \"$e->{NAME}\");\n";
	    }
	} else {
	    $result .= "\ts->$prefix$e->{NAME} = $e->{TYPE}_ptr_from_python(mem_ctx, $obj, \"$e->{NAME}\");\n";
	}
    }

    return $result;
}

# Generate code to convert an array to a Python object

sub ArrayToPython($$)
{
    my($e) = shift;
    my($prefix) = shift;
    my($result) = "";

    my($array_len) = $e->{ARRAY_LEN};

    if ($array_len eq "*") {
	$array_len = util::has_property($e, "size_is");
    }

    if (!util::is_constant($array_len)) {
	$array_len = "s->$prefix$array_len";
    }

    my($type) = $e->{TYPE};

    if (!util::is_scalar_type($type)) {
	$type = "struct $type";
    }

    $result .= "\n\t{\n";
    $result .= "\t\tPyObject *temp;\n";
    $result .= "\t\tint i;\n\n";

    $result .= "\t\ttemp = PyList_New($array_len);\n\n";
    $result .= "\t\tfor (i = 0; i < $array_len; i++) {\n";
    if (util::is_scalar_type($e->{TYPE})) {
	$result .= "\t\t\tPyList_SetItem(temp, i, $e->{TYPE}_to_python(s->$prefix$e->{NAME}\[i\]));\n";
    } else {
	$result .= "\t\t\tPyList_SetItem(temp, i, $e->{TYPE}_ptr_to_python(mem_ctx, &s->$prefix$e->{NAME}\[i\]));\n";	
    }
    $result .= "\t\t}\n";

    $result .= "\t\tPyDict_SetItem(obj, PyString_FromString(\"$e->{NAME}\"), temp);\n";

    $result .= "\t}\n";

    return $result;
}

# Generate code to convert a structure field to a Python object

sub FieldToPython($$)
{
    my($e) = shift;
    my($prefix) = shift;
    my($result) = "";

    # Special cases

    if ($e->{TYPE} eq "string" && $e->{POINTERS} == 1) {
	$result .= "\tPyDict_SetItem(obj, PyString_FromString(\"$e->{NAME}\"), string_ptr_to_python(mem_ctx, s->$prefix$e->{NAME}));\n";
	return $result;
    }

    # Generate conversion for element

    if (util::is_scalar_type($e->{TYPE})) {
	if ($e->{POINTERS} == 0) {
	    if ($e->{ARRAY_LEN}) {
		$result .= ArrayToPython($e, $prefix);
	    } else {
		$result .= "\tPyDict_SetItem(obj, PyString_FromString(\"$e->{NAME}\"), $e->{TYPE}_to_python(s->$prefix$e->{NAME}));\n";
	    }
	} else {
	    $result .= "\t// Pointer to scalar\n";
	    $result .= DebugField($e);
	}
    } else {
	if ($e->{POINTERS} == 0) {
	    if ($e->{ARRAY_LEN}) {
		$result .= ArrayToPython($e, $prefix);
	    } else {
		$result .= "\tPyDict_SetItem(obj, PyString_FromString(\"$e->{NAME}\"), $e->{TYPE}_ptr_to_python(mem_ctx, &s->$prefix$e->{NAME}));\n";
	    }
	} else {
	    $result .= "\tPyDict_SetItem(obj, PyString_FromString(\"$e->{NAME}\"), $e->{TYPE}_ptr_to_python(mem_ctx, s->$prefix$e->{NAME}));\n";
	}
    }

    return $result;
}

sub ParseFunction($)
{
    my($fn) = shift;
    my($result) = "";

    $result .= "%{\n\n";

    $result .= "/*\n\n";
    $result .= IdlDump::DumpFunction($fn);
    $result .= "*/\n\n";

    # Generate function to convert Python dict to structure pointer

    $result .= "/* Convert Python dict to struct $fn->{NAME}.in */\n\n";

    $result .= "struct $fn->{NAME} *$fn->{NAME}_ptr_from_python(TALLOC_CTX *mem_ctx, PyObject *obj, char *name)\n";
    $result .= "{\n";

    $result .= "\tstruct $fn->{NAME} *s;\n\n";

    $result .= "\tif (!PyDict_Check(obj)) {\n";
    $result .= "\t\tPyErr_Format(PyExc_TypeError, \"Expecting dict value for key '%s'\", name);\n";
    $result .= "\t\treturn NULL;\n";
    $result .= "\t}\n\n";

    $result .= "\ts = talloc(mem_ctx, sizeof(struct $fn->{NAME}));\n\n";

    # Remove this when all elements are initialised
    $result .= "\tmemset(s, 0, sizeof(struct $fn->{NAME}));\n\n";

    foreach my $e (@{$fn->{DATA}}) {
	$result .= FieldFromPython($e, "in.") if util::has_property($e, "in")
    }

    $result .= "\n";
    $result .= "\treturn s;\n";
    $result .= "}\n\n";

    # Generate function to convert structure pointer to Python dict

    $result .= "/* Convert struct $fn->{NAME}.out to Python dict */\n\n";

    $result .= "PyObject *$fn->{NAME}_ptr_to_python(TALLOC_CTX *mem_ctx, struct $fn->{NAME} *s)\n";
    $result .= "{\n";

    $result .= "\tPyObject *obj = PyDict_New();\n\n";

    foreach my $e (@{$fn->{DATA}}) {
	$result .= FieldToPython($e, "out.") if util::has_property($e, "out")
    }

    $result .= "\n";
    $result .= "\treturn obj;\n";
    $result .= "}\n\n";

    $result .= "%}\n\n";

    # Input typemap

    $result .= "%typemap(in) struct $fn->{NAME} * {\n";
    $result .= "\tTALLOC_CTX *mem_ctx = talloc_init(\"typemap(int) $fn->{NAME}\");\n\n";
    $result .= "\t\$1 = $fn->{NAME}_ptr_from_python(mem_ctx, \$input, \"<function params>\");\n\n";

    $result .= "\tif (PyErr_Occurred())\n";
    $result .= "\t\t\treturn NULL;\n\n";

    $result .= "}\n\n";

    # Output typemap

    $result .= "%typemap(argout) struct $fn->{NAME} * {\n";
    $result .= "\tTALLOC_CTX *mem_ctx = talloc_init(\"typemap(argout) $fn->{NAME}\");\n\n";
    $result .= "\tlong status = PyLong_AsLong(resultobj);\n";
    $result .= "\tPyObject *dict;\n";
    $result .= "\n";

    $result .= "\tif (status != 0) {\n";
    $result .= "\t\tset_ntstatus_exception(status);\n";
    $result .= "\t\treturn NULL;\n";
    $result .= "\t}\n";
    $result .= "\n";
    $result .= "\tdict = $fn->{NAME}_ptr_to_python(mem_ctx, \$1);\n";

    $result .= "\tresultobj = dict;\n";
    $result .= "}\n\n";

    # Function definitions

    $result .= "%rename($fn->{NAME}) dcerpc_$fn->{NAME};\n";
    $result .= "$fn->{RETURN_TYPE} dcerpc_$fn->{NAME}(struct dcerpc_pipe *p, TALLOC_CTX *mem_ctx, struct $fn->{NAME} *r);\n\n";

    return $result;
}

sub ParseStruct($)
{
    my($s) = shift;
    my($result) = "";

    $result .= "%{\n\n";

    $result .= "/*\n\n";
    $result .= IdlDump::DumpTypedef($s);
    $result .= "*/\n\n";

    # Generate function to convert Python dict to structure pointer 

    $result .= "/* Convert Python dict to struct $s->{NAME} pointer */\n\n";
    
    $result .= "struct $s->{NAME} *$s->{NAME}_ptr_from_python(TALLOC_CTX *mem_ctx, PyObject *obj, char *name)\n";
    $result .= "{\n";
    $result .= "\tstruct $s->{NAME} *s;\n\n";

    $result .= "\tif (obj == NULL) {\n";
    $result .= "\t\tPyErr_Format(PyExc_ValueError, \"Expecting key '%s'\", name);\n";
    $result .= "\t\treturn NULL;\n";
    $result .= "\t}\n\n";

    $result .= "\tif (obj == Py_None) {\n";
    $result .= "\t\treturn NULL;\n";
    $result .= "\t}\n\n";

    $result .= "\tif (!PyDict_Check(obj)) {\n";
    $result .= "\t\tPyErr_Format(PyExc_TypeError, \"Expecting dict value for key '%s'\", name);\n";
    $result .= "\t\treturn NULL;\n";
    $result .= "\t}\n\n";

    $result .= "\ts = talloc(mem_ctx, sizeof(struct $s->{NAME}));\n\n";

    foreach my $e (@{$s->{DATA}{ELEMENTS}}) {
	$result .= FieldFromPython($e, "");
    }

    $result .= "\n";
    $result .= "\treturn s;\n";
    $result .= "}\n\n";

    # Generate function to convert Python dict to structure

    $result .= "/* Convert Python dict to struct $s->{NAME} */\n\n";
    
    $result .= "void $s->{NAME}_from_python(TALLOC_CTX *mem_ctx, struct $s->{NAME} *s, PyObject *obj, char *name)\n";
    $result .= "{\n";

    $result .= "\tif (obj == NULL) {\n";
    $result .= "\t\tPyErr_Format(PyExc_ValueError, \"Expecting key '%s'\", name);\n";
    $result .= "\t\treturn;\n";
    $result .= "\t}\n\n";

    $result .= "\tif (!PyDict_Check(obj)) {\n";
    $result .= "\t\tPyErr_Format(PyExc_TypeError, \"Expecting dict value for key '%s'\", name);\n";
    $result .= "\t\treturn;\n";
    $result .= "\t}\n\n";

    foreach my $e (@{$s->{DATA}{ELEMENTS}}) {
	$result .= FieldFromPython($e, "");
    }

    $result .= "}\n\n";

    # Generate function to convert structure pointer to Python dict

    $result .= "/* Convert struct $s->{NAME} pointer to Python dict */\n\n";

    $result .= "PyObject *$s->{NAME}_ptr_to_python(TALLOC_CTX *mem_ctx, struct $s->{NAME} *s)\n";
    $result .= "{\n";
    
    $result .= "\tPyObject *obj = PyDict_New();\n\n";

    $result .= "\tif (s == NULL) {\n";
    $result .= "\t\tPy_INCREF(Py_None);\n";
    $result .= "\t\treturn Py_None;\n";
    $result .= "\t}\n\n";
    
    foreach my $e (@{$s->{DATA}{ELEMENTS}}) {
	$result .= FieldToPython($e, "");
    }

    $result .= "\n";
    $result .= "\treturn obj;\n";
    $result .= "}\n";

    $result .= "\n%}\n\n";    

    return $result;
}

sub ParseUnion($)
{
    my($u) = shift;
    my($result) = "";

    $result .= "/*\n\n";
    $result .= IdlDump::DumpTypedef($u);
    $result .= "*/\n\n";

    # Generate function to convert Python dict to union pointer

    $result .= "%{\n\n";
    $result .= "/* Convert Python dict to union $u->{NAME} pointer */\n\n";

    $result .= "union $u->{NAME} *$u->{NAME}_ptr_from_python(TALLOC_CTX *mem_ctx, PyObject *obj, char *name)\n";
    $result .= "{\n";

    $result .= "\tunion $u->{NAME} *u;\n";
    $result .= "\tPyObject *dict;\n\n";
    
    $result .= "\tif (obj == NULL) {\n";
    $result .= "\t\tPyErr_Format(PyExc_ValueError, \"Expecting key '%s'\", name);\n";
    $result .= "\t\treturn NULL;\n";
    $result .= "\t}\n\n";

    $result .= "\tif (!PyDict_Check(obj)) {\n";
    $result .= "\t\tPyErr_Format(PyExc_TypeError, \"Expecting dict value for key '%s'\", name);\n";
    $result .= "\t\treturn NULL;\n";
    $result .= "\t}\n\n";

    $result .= "\tu = talloc(mem_ctx, sizeof(union $u->{NAME}));\n\n";

    for my $e (@{$u->{DATA}{DATA}}) {
	$result .= "\tif ((dict = PyDict_GetItem(obj, PyString_FromString(\"$e->{DATA}{NAME}\")))) {\n";
	if ($e->{DATA}{POINTERS} == 0) {
	    $result .= "\t\t$e->{DATA}{TYPE}_from_python(mem_ctx, &u->$e->{DATA}{NAME}, dict, \"$e->{DATA}{NAME}\");\n";
	} elsif ($e->{DATA}{POINTERS} == 1) {
	    $result .= "\t\tu->$e->{DATA}{NAME} = $e->{DATA}{TYPE}_ptr_from_python(mem_ctx, dict, \"$e->{DATA}{NAME}\");\n";
	} else {
	    $result .= "\t\t// $e->{DATA}{TYPE} pointers=$e->{DATA}{POINTERS}\n";
	}

	$result .= "\t\treturn u;\n";
	$result .= "\t}\n\n";
    }

    $result .= "\treturn NULL;\n";
    $result .= "}\n\n";

    # Generate function to convert Python dict to union

    $result .= "/* Convert Python dict to union $u->{NAME} */\n\n";

    $result .= "void $u->{NAME}_from_python(TALLOC_CTX *mem_ctx, union $u->{NAME} *u, PyObject *obj, char *name)\n";
    $result .= "{\n";
    $result .= "\tPyObject *dict;\n\n";

    $result .= "\tif (obj == NULL) {\n";
    $result .= "\t\tPyErr_Format(PyExc_ValueError, \"Expecting key '%s'\", name);\n";
    $result .= "\t\treturn;\n";
    $result .= "\t}\n\n";

    $result .= "\tif (!PyDict_Check(obj)) {\n";
    $result .= "\t\tPyErr_Format(PyExc_TypeError, \"Expecting dict value for key '%s'\", name);\n";
    $result .= "\t\treturn;\n";
    $result .= "\t}\n\n";

    for my $e (@{$u->{DATA}{DATA}}) {
	$result .= "\tif ((dict = PyDict_GetItem(obj, PyString_FromString(\"$e->{DATA}{NAME}\")))) {\n";
	if ($e->{DATA}{POINTERS} == 0) {
	    $result .= "\t\t$e->{DATA}{TYPE}_from_python(mem_ctx, &u->$e->{DATA}{NAME}, dict, \"$e->{DATA}{NAME}\");\n";
	} elsif ($e->{DATA}{POINTERS} == 1) {
	    $result .= "\t\tu->$e->{DATA}{NAME} = $e->{DATA}{TYPE}_ptr_from_python(mem_ctx, dict, \"$e->{DATA}{NAME}\");\n";
	} else {
	    $result .= "\t\t// $e->{DATA}{TYPE} pointers=$e->{DATA}{POINTERS}\n";
	}

	$result .= "\t\treturn;\n";
	$result .= "\t}\n\n";
    }
    $result .= "}\n";

    # Generate function to convert union pointer to Python dict

    $result .= "/* Convert union $u->{NAME} pointer to Python dict */\n\n";

    $result .= "PyObject *$u->{NAME}_ptr_to_python(TALLOC_CTX *mem_ctx, union $u->{NAME} *u)\n";
    $result .= "{\n";

    $result .= "\tif (u == NULL) {\n";
    $result .= "\t\tPy_INCREF(Py_None);\n";
    $result .= "\t\treturn Py_None;\n";
    $result .= "\t}\n\n";

    $result .= "\treturn PyDict_New();\n";
    $result .= "}\n\n";

    $result .= "\n%}\n\n";    

    return $result;
}

sub ParseTypedef($)
{
    my($t) = shift;
    my($result) = "";

    foreach my $e ($t) {
	$result .= ParseStruct($e) if $e->{DATA}{TYPE} eq "STRUCT";
	$result .= ParseUnion($e) if $e->{DATA}{TYPE} eq "UNION";
    }

    return $result;
}

sub ParseInheritedData($)
{
    my($data) = shift;
    my($result) = "";

    foreach my $e (@{$data}) {
	$result .= ParseFunction($e) if $e->{TYPE} eq "FUNCTION";
	$result .= ParseTypedef($e) if $e->{TYPE} eq "TYPEDEF";
    }

    return $result;
}

sub ParseHeader($)
{
    my($hdr) = shift;
    my($result) = "";

    if ($hdr->{PROPERTIES}{uuid}) {
	my($name) = $hdr->{NAME};
	$result .= "#define DCERPC_" . uc($name) . "_UUID \"$hdr->{PROPERTIES}->{uuid}\"\n";
	$result .= "const int DCERPC_" . uc($name) . "_VERSION = " . $hdr->{PROPERTIES}->{version} . ";\n";
	$result .= "#define DCERPC_" . uc($name) . "_NAME \"" . $name . "\"\n";
	$result .= "\n";
    }

    $result .= ParseInheritedData($hdr->{INHERITED_DATA});

    return $result;
}

sub Parse($)
{
    my($idl) = shift;
    my($result) = "";

    # Make index of functions, structs and unions.  Currently unused.

    my(%interfaces, %functions, %structs, %unions);

    foreach my $x (@{$idl}) {
	my($iname) = $x->{NAME};
	$interfaces{$iname} = $x->{PROPERTIES};
	foreach my $i (@{$x->{INHERITED_DATA}}) {
	    $functions{$iname}{$i->{NAME}} = $i if $i->{TYPE} eq "FUNCTION";
	    if ($i->{TYPE} eq "TYPEDEF") {
		$structs{$iname}{$i->{NAME}} = $i->{DATA} if $i->{DATA}{TYPE} eq "STRUCT";
		$unions{$iname}{$i->{NAME}} = $i->{DATA} if $i->{DATA}{TYPE} eq "UNION";
	    }
	}
    }

    # Generate interface

    $result = "/* Auto-generated by pidl */\n\n";
    $result = "/* Tastes like -*- C -*- */\n\n";

    foreach my $x (@{$idl}) {
	$result .= ParseHeader($x) if ($x->{TYPE} eq "INTERFACE");
    }

    return $result;
}

1;