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ScriptFu: Extract function marshal_returned_PDB_value

This commit is contained in:
bootchk 2023-09-07 07:10:51 -04:00 committed by Lloyd Konneker
parent e832b73e55
commit 3e0f37d00a
4 changed files with 391 additions and 286 deletions
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3
plug-ins/script-fu/libscriptfu/meson.build
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@ -6,6 +6,7 @@ subdir('ftx')
libscriptfu_sources = [
'scheme-wrapper.c',
'scheme-marshal.c',
'scheme-marshal-return.c',
'script-fu-interface.c',
'script-fu-regex.c',
'script-fu-script.c',
@ -19,7 +20,7 @@ libscriptfu_sources = [
'script-fu-register.c',
'script-fu-dialog.c',
'script-fu-run-func.c',
'script-fu-command.c'
'script-fu-command.c',
]
# !! just "library(...)" which means shared versus static depends on configuration of project.

343
plug-ins/script-fu/libscriptfu/scheme-marshal-return.c Normal file
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@ -0,0 +1,343 @@
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "libgimp/gimp.h"
#include "tinyscheme/scheme-private.h"
#include "script-fu-errors.h"
#include "scheme-marshal.h"
#include "scheme-marshal-return.h"
/* When include scheme-private.h, must undef cons macro */
#undef cons
/* The below code for array results is not safe.
* It implicitly requires, but does not explicitly check,
* that the returned length equals the actual length of the returned array,
* and iterates over the returned array assuming it has the returned length.
* It could read past the end of the array.
*/
/* Convert a GValue from C type to Scheme type.
*
* Returns a scheme "pointer" type referencing the scheme value.
*
* When the value has C type an array type,
* array_length must be its length,
* otherwise array_length is not used.
*
* Either returns a non-null scheme value and sets error to null,
* or sets error and returns a null scheme value.
* IOW, error is an OUT argument.
*
* The returned scheme value is an atom or a container (list or vector.)
* Returned containers are homogeneous (elements all the same type.)
* Returned atoms are scheme type number or string.
* Currently, does not return atoms of scheme type byte or char
* (no PDB procedure returns those types.)
*
* !!! Returns a scheme number (0 or 1) for C type boolean.
* FUTURE: return atoms #f and #t.
*/
pointer
marshal_returned_PDB_value (scheme *sc,
GValue *value,
guint array_length,
pointer *error)
{
pointer result = sc->NIL;
gint j;
gchar error_str[1024];
*error = NULL;
/* Order is important.
* GFile before other objects.
* GIMP resource objects before GIMP Image, Drawable, etc. objects.
* Alternatively, more specific tests.
*/
if (G_VALUE_TYPE (value) == G_TYPE_FILE)
{
gchar *parsed_filepath = marshal_returned_gfile_to_string (value);
if (parsed_filepath)
{
g_debug ("PDB procedure returned GFile '%s'", parsed_filepath);
/* copy string into interpreter state. */
result = sc->vptr->mk_string (sc, parsed_filepath);
g_free (parsed_filepath);
}
else
{
g_warning ("PDB procedure failed to return a valid GFile");
result = sc->vptr->mk_string (sc, "");
}
/* Ensure result holds a string, possibly empty. */
}
else if (GIMP_VALUE_HOLDS_RESOURCE (value))
{
/* ScriptFu represents resource objects by ther unique string ID's. */
GObject *object = g_value_get_object (value);
gchar *name = NULL;
if (object)
name = gimp_resource_get_name (GIMP_RESOURCE(object));
if (! name)
g_warning("PDB procedure returned NULL object.");
result = sc->vptr->mk_string (sc, name);
g_free (name);
}
else if (G_VALUE_HOLDS_OBJECT (value))
{
/* G_VALUE_HOLDS_OBJECT only ensures value derives from GObject.
* Could be a GIMP or a GLib type.
* Here we handle GIMP types, which all have an id property.
* Resources have a string ID and Images and Drawables etc. have an int ID.
*/
GObject *object = g_value_get_object (value);
gint id = -1;
/* expect a GIMP opaque object having an "id" property */
if (object)
g_object_get (object, "id", &id, NULL);
/* id is -1 when the gvalue had no GObject*,
* or the referenced object had no property "id".
* This can be an undetected fault in the called procedure.
* It is not necessarily an error in the script.
*/
if (id == -1)
g_warning("PDB procedure returned NULL GIMP object.");
g_debug ("PDB procedure returned object ID: %i", id);
/* Scriptfu stores object IDs as int. */
result = sc->vptr->mk_integer (sc, id);
}
else if (G_VALUE_HOLDS_INT (value))
{
gint v = g_value_get_int (value);
result = sc->vptr->mk_integer (sc, v);
}
else if (G_VALUE_HOLDS_UINT (value))
{
guint v = g_value_get_uint (value);
result = sc->vptr->mk_integer (sc, v);
}
else if (G_VALUE_HOLDS_DOUBLE (value))
{
gdouble v = g_value_get_double (value);
result = sc->vptr->mk_real (sc, v);
}
else if (G_VALUE_HOLDS_ENUM (value))
{
gint v = g_value_get_enum (value);
result = sc->vptr->mk_integer (sc, v);
}
else if (G_VALUE_HOLDS_BOOLEAN (value))
{
gboolean v = g_value_get_boolean (value);
result = sc->vptr->mk_integer (sc, v);
}
else if (G_VALUE_HOLDS_STRING (value))
{
const gchar *v = g_value_get_string (value);
if (! v)
v = "";
result = sc->vptr->mk_string (sc, v);
}
else if (GIMP_VALUE_HOLDS_INT32_ARRAY (value))
{
const gint32 *v = gimp_value_get_int32_array (value);
pointer vector = sc->vptr->mk_vector (sc, array_length);
for (j = 0; j < array_length; j++)
{
sc->vptr->set_vector_elem (vector, j,
sc->vptr->mk_integer (sc, v[j]));
}
result = vector;
}
else if (G_VALUE_HOLDS (value, G_TYPE_BYTES))
{
GBytes *v_bytes = g_value_get_boxed (value);
const guint8 *v = g_bytes_get_data (v_bytes, NULL);
gsize n = g_bytes_get_size (v_bytes);
pointer vector = sc->vptr->mk_vector (sc, n);
for (j = 0; j < n; j++)
{
sc->vptr->set_vector_elem (vector, j,
sc->vptr->mk_integer (sc, v[j]));
}
result = vector;
}
else if (GIMP_VALUE_HOLDS_FLOAT_ARRAY (value))
{
const gdouble *v = gimp_value_get_float_array (value);
pointer vector = sc->vptr->mk_vector (sc, array_length);
for (j = 0; j < array_length; j++)
{
sc->vptr->set_vector_elem (vector, j,
sc->vptr->mk_real (sc, v[j]));
}
result = vector;
}
else if (G_VALUE_HOLDS (value, G_TYPE_STRV))
{
gint32 n = 0;
const gchar **v = g_value_get_boxed (value);
pointer list = sc->NIL;
n = (v)? g_strv_length ((char **) v) : 0;
for (j = n - 1; j >= 0; j--)
{
list = sc->vptr->cons (sc,
sc->vptr->mk_string (sc,
v[j] ?
v[j] : ""),
list);
}
result = list;
}
else if (GIMP_VALUE_HOLDS_RGB (value))
{
GimpRGB v;
guchar r, g, b;
gpointer temp_val;
gimp_value_get_rgb (value, &v);
gimp_rgb_get_uchar (&v, &r, &g, &b);
temp_val = sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, r),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, g),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, b),
sc->NIL)));
result = temp_val;
}
else if (GIMP_VALUE_HOLDS_RGB_ARRAY (value))
{
const GimpRGB *v = gimp_value_get_rgb_array (value);
pointer vector = sc->vptr->mk_vector (sc, array_length);
for (j = 0; j < array_length; j++)
{
guchar r, g, b;
pointer temp_val;
gimp_rgb_get_uchar (&v[j], &r, &g, &b);
temp_val = sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, r),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, g),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, b),
sc->NIL)));
sc->vptr->set_vector_elem (vector, j, temp_val);
}
result = vector;
}
else if (GIMP_VALUE_HOLDS_PARASITE (value))
{
GimpParasite *v = g_value_get_boxed (value);
if (v->name == NULL)
{
/* Wrongly passed a Parasite that appears to be null, or other error. */
*error = implementation_error (sc, "Error: null parasite", 0);
}
else
{
gchar *data = g_strndup (v->data, v->size);
gint char_cnt = g_utf8_strlen (data, v->size);
pointer temp_val;
/* don't move the mk_foo() calls outside this function call,
* otherwise they might be garbage collected away!
*/
temp_val = sc->vptr->cons
(sc,
sc->vptr->mk_string (sc, v->name),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, v->flags),
sc->vptr->cons
(sc,
sc->vptr->mk_counted_string (sc,
data,
char_cnt),
sc->NIL)));
result = temp_val;
g_free (data);
g_debug ("name '%s'", v->name);
g_debug ("flags %d", v->flags);
g_debug ("size %d", v->size);
g_debug ("data '%.*s'", v->size, (gchar *) v->data);
}
}
else if (GIMP_VALUE_HOLDS_OBJECT_ARRAY (value))
{
result = marshal_returned_object_array_to_vector (sc, value);
}
else if (G_VALUE_TYPE (&value) == GIMP_TYPE_PDB_STATUS_TYPE)
{
/* Called procedure implemented incorrectly. */
*error = implementation_error (sc, "Procedure execution returned multiple status values", 0);
}
else
{
/* Missing cases here. */
g_snprintf (error_str, sizeof (error_str),
"Unhandled return type %s",
G_VALUE_TYPE_NAME (value));
*error = implementation_error (sc, error_str, 0);
}
g_assert ( (result == NULL && *error != NULL)
|| (result != NULL && *error == NULL));
return result;
}

27
plug-ins/script-fu/libscriptfu/scheme-marshal-return.h Normal file
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@ -0,0 +1,27 @@
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef __SCHEME_MARSHAL_RETURN_H__
#define __SCHEME_MARSHAL_RETURN_H__
pointer marshal_returned_PDB_value (scheme *sc,
GValue *value,
guint array_length,
pointer *error);
#endif /* __SCHEME_MARSHAL_RETURN_H__ */

304
plug-ins/script-fu/libscriptfu/scheme-wrapper.c
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@ -46,6 +46,7 @@
#include "scheme-wrapper.h"
#include "scheme-marshal.h"
#include "scheme-marshal-return.h"
#undef cons
@ -1351,304 +1352,37 @@ script_fu_marshal_procedure_call (scheme *sc,
/* Counting down, i.e. traversing in reverse.
* i+1 is the current index. i is the preceding value.
* When at the current index is an array, preceding value (at i) is array length.
*
* The below code for array results is not safe.
* It implicitly requires, but does not explicitly check,
* that the returned length equals the actual length of the returned array,
* and iterates over the returned array assuming it has the returned length.
*/
for (i = gimp_value_array_length (values) - 2; i >= 0; --i)
{
GValue *value = gimp_value_array_index (values, i + 1);
gint j;
pointer scheme_value;
pointer error = NULL;
gint32 array_length = 0;
g_debug ("Return value %d is type %s", i+1, G_VALUE_TYPE_NAME (value));
/* Order is important.
* GFile before other objects.
* GIMP resource objects before GIMP Image, Drawable, etc. objects.
* Alternatively, more specific tests.
*/
if (G_VALUE_TYPE (value) == G_TYPE_FILE)
/* In some cases previous value is array_length. */
if ( GIMP_VALUE_HOLDS_INT32_ARRAY (value)
|| GIMP_VALUE_HOLDS_FLOAT_ARRAY (value)
|| GIMP_VALUE_HOLDS_RGB_ARRAY (value))
{
gchar *parsed_filepath = marshal_returned_gfile_to_string (value);
if (parsed_filepath)
{
g_debug ("PDB procedure returned GFile '%s'", parsed_filepath);
/* copy string into interpreter state. */
return_val = sc->vptr->cons (sc, sc->vptr->mk_string (sc, parsed_filepath), return_val);
g_free (parsed_filepath);
}
else
{
g_warning ("PDB procedure failed to return a valid GFile");
return_val = sc->vptr->cons (sc, sc->vptr->mk_string (sc, ""), return_val);
}
/* Ensure return_val holds a string, possibly empty. */
array_length = GIMP_VALUES_GET_INT (values, i);
}
else if (GIMP_VALUE_HOLDS_RESOURCE (value))
scheme_value = marshal_returned_PDB_value (sc, value, array_length, &error);
if (error == NULL)
{
/* ScriptFu represents resource objects by ther unique string ID's. */
GObject *object = g_value_get_object (value);
gchar *name = NULL;
if (object)
name = gimp_resource_get_name (GIMP_RESOURCE(object));
if (! name)
g_warning("PDB procedure returned NULL object.");
return_val = sc->vptr->cons (sc, sc->vptr->mk_string (sc, name),
return_val);
g_free (name);
}
else if (G_VALUE_HOLDS_OBJECT (value))
{
/* G_VALUE_HOLDS_OBJECT only ensures value derives from GObject.
* Could be a GIMP or a GLib type.
* Here we handle GIMP types, which all have an id property.
* Resources have a string ID and Images and Drawables etc. have an int ID.
*/
GObject *object = g_value_get_object (value);
gint id = -1;
/* expect a GIMP opaque object having an "id" property */
if (object)
g_object_get (object, "id", &id, NULL);
/* id is -1 when the gvalue had no GObject*,
* or the referenced object had no property "id".
* This can be an undetected fault in the called procedure.
* It is not necessarily an error in the script.
*/
if (id == -1)
g_warning("PDB procedure returned NULL GIMP object.");
g_debug ("PDB procedure returned object ID: %i", id);
/* Scriptfu stores object IDs as int. */
return_val = sc->vptr->cons (sc, sc->vptr->mk_integer (sc, id),
return_val);
}
else if (G_VALUE_HOLDS_INT (value))
{
gint v = g_value_get_int (value);
return_val = sc->vptr->cons (sc, sc->vptr->mk_integer (sc, v),
return_val);
}
else if (G_VALUE_HOLDS_UINT (value))
{
guint v = g_value_get_uint (value);
return_val = sc->vptr->cons (sc, sc->vptr->mk_integer (sc, v),
return_val);
}
else if (G_VALUE_HOLDS_DOUBLE (value))
{
gdouble v = g_value_get_double (value);
return_val = sc->vptr->cons (sc, sc->vptr->mk_real (sc, v),
return_val);
}
else if (G_VALUE_HOLDS_ENUM (value))
{
gint v = g_value_get_enum (value);
return_val = sc->vptr->cons (sc, sc->vptr->mk_integer (sc, v),
return_val);
}
else if (G_VALUE_HOLDS_BOOLEAN (value))
{
gboolean v = g_value_get_boolean (value);
return_val = sc->vptr->cons (sc, sc->vptr->mk_integer (sc, v),
return_val);
}
else if (G_VALUE_HOLDS_STRING (value))
{
const gchar *v = g_value_get_string (value);
if (! v)
v = "";
return_val = sc->vptr->cons (sc, sc->vptr->mk_string (sc, v),
return_val);
}
else if (GIMP_VALUE_HOLDS_INT32_ARRAY (value))
{
gint32 n = GIMP_VALUES_GET_INT (values, i);
const gint32 *v = gimp_value_get_int32_array (value);
pointer vector = sc->vptr->mk_vector (sc, n);
for (j = 0; j < n; j++)
{
sc->vptr->set_vector_elem (vector, j,
sc->vptr->mk_integer (sc, v[j]));
}
return_val = sc->vptr->cons (sc, vector, return_val);
}
else if (G_VALUE_HOLDS (value, G_TYPE_BYTES))
{
GBytes *v_bytes = g_value_get_boxed (value);
const guint8 *v = g_bytes_get_data (v_bytes, NULL);
gsize n = g_bytes_get_size (v_bytes);
pointer vector = sc->vptr->mk_vector (sc, n);
for (j = 0; j < n; j++)
{
sc->vptr->set_vector_elem (vector, j,
sc->vptr->mk_integer (sc, v[j]));
}
return_val = sc->vptr->cons (sc, vector, return_val);
}
else if (GIMP_VALUE_HOLDS_FLOAT_ARRAY (value))
{
gint32 n = GIMP_VALUES_GET_INT (values, i);
const gdouble *v = gimp_value_get_float_array (value);
pointer vector = sc->vptr->mk_vector (sc, n);
for (j = 0; j < n; j++)
{
sc->vptr->set_vector_elem (vector, j,
sc->vptr->mk_real (sc, v[j]));
}
return_val = sc->vptr->cons (sc, vector, return_val);
}
else if (G_VALUE_HOLDS (value, G_TYPE_STRV))
{
gint32 n = 0;
const gchar **v = g_value_get_boxed (value);
pointer list = sc->NIL;
n = (v)? g_strv_length ((char **) v) : 0;
for (j = n - 1; j >= 0; j--)
{
list = sc->vptr->cons (sc,
sc->vptr->mk_string (sc,
v[j] ?
v[j] : ""),
list);
}
return_val = sc->vptr->cons (sc, list, return_val);
}
else if (GIMP_VALUE_HOLDS_RGB (value))
{
GimpRGB v;
guchar r, g, b;
gpointer temp_val;
gimp_value_get_rgb (value, &v);
gimp_rgb_get_uchar (&v, &r, &g, &b);
temp_val = sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, r),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, g),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, b),
sc->NIL)));
return_val = sc->vptr->cons (sc,
temp_val,
return_val);
}
else if (GIMP_VALUE_HOLDS_RGB_ARRAY (value))
{
gint32 n = GIMP_VALUES_GET_INT (values, i);
const GimpRGB *v = gimp_value_get_rgb_array (value);
pointer vector = sc->vptr->mk_vector (sc, n);
for (j = 0; j < n; j++)
{
guchar r, g, b;
pointer temp_val;
gimp_rgb_get_uchar (&v[j], &r, &g, &b);
temp_val = sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, r),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, g),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, b),
sc->NIL)));
sc->vptr->set_vector_elem (vector, j, temp_val);
}
return_val = sc->vptr->cons (sc, vector, return_val);
}
else if (GIMP_VALUE_HOLDS_PARASITE (value))
{
GimpParasite *v = g_value_get_boxed (value);
if (v->name == NULL)
{
/* Wrongly passed a Parasite that appears to be null, or other error. */
return_val = implementation_error (sc, "Error: null parasite", 0);
}
else
{
gchar *data = g_strndup (v->data, v->size);
gint char_cnt = g_utf8_strlen (data, v->size);
pointer temp_val;
/* don't move the mk_foo() calls outside this function call,
* otherwise they might be garbage collected away!
*/
temp_val = sc->vptr->cons
(sc,
sc->vptr->mk_string (sc, v->name),
sc->vptr->cons
(sc,
sc->vptr->mk_integer (sc, v->flags),
sc->vptr->cons
(sc,
sc->vptr->mk_counted_string (sc,
data,
char_cnt),
sc->NIL)));
return_val = sc->vptr->cons (sc,
temp_val,
return_val);
g_free (data);
g_debug ("name '%s'", v->name);
g_debug ("flags %d", v->flags);
g_debug ("size %d", v->size);
g_debug ("data '%.*s'", v->size, (gchar *) v->data);
}
}
else if (GIMP_VALUE_HOLDS_OBJECT_ARRAY (value))
{
pointer vector = marshal_returned_object_array_to_vector (sc, value);
return_val = sc->vptr->cons (sc, vector, return_val);
}
else if (G_VALUE_TYPE (&value) == GIMP_TYPE_PDB_STATUS_TYPE)
{
/* Called procedure implemented incorrectly. */
return implementation_error (sc, "Procedure execution returned multiple status values", 0);
/* Prepend to scheme list of returned values and continue iteration. */
return_val = sc->vptr->cons (sc, scheme_value, return_val);
}
else
{
/* Missing cases here. */
g_snprintf (error_str, sizeof (error_str),
"Unhandled return type %s",
G_VALUE_TYPE_NAME (value));
return implementation_error (sc, error_str, 0);
/* Error marshalling a single return value.
* Any scheme values already marshalled will be garbage collected.
*/
return error;
}
}
break;