[libcamera-devel,v9,5/7] py: generate control enums from yaml

15825 diff mbox series

diff --git a/src/py/libcamera/gen-py-control-enums.py b/src/py/libcamera/gen-py-control-enums.py
new file mode 100755
index 00000000..dcc28b1a
--- /dev/null
+++ b/src/py/libcamera/gen-py-control-enums.py
@@ -0,0 +1,95 @@ 
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Generate Python bindings enums for controls from YAML
+
+import argparse
+import string
+import sys
+import yaml
+
+
+def find_common_prefix(strings):
+    prefix = strings[0]
+
+    for string in strings[1:]:
+        while string[:len(prefix)] != prefix and prefix:
+            prefix = prefix[:len(prefix) - 1]
+        if not prefix:
+            break
+
+    return prefix
+
+
+def generate_py(controls):
+    out = ''
+
+    for ctrl in controls:
+        name, ctrl = ctrl.popitem()
+
+        enum = ctrl.get('enum')
+        if not enum:
+            continue
+
+        if ctrl.get('draft'):
+            ns = 'libcamera::controls::draft::'
+        else:
+            ns = 'libcamera::controls::'
+
+        cpp_enum = name + 'Enum'
+
+        out += '\tpy::enum_<{}{}>(m, \"{}\")\n'.format(ns, cpp_enum, name)
+
+        if name == 'LensShadingMapMode':
+            prefix = 'LensShadingMapMode'
+        else:
+            prefix = find_common_prefix([e['name'] for e in enum])
+
+        for entry in enum:
+            cpp_enum = entry['name']
+            py_enum = entry['name'][len(prefix):]
+
+            out += '\t\t.value(\"{}\", {}{})\n'.format(py_enum, ns, cpp_enum)
+
+        out += '\t;\n'
+
+    return {'enums': out}
+
+
+def fill_template(template, data):
+    template = open(template, 'rb').read()
+    template = template.decode('utf-8')
+    template = string.Template(template)
+    return template.substitute(data)
+
+
+def main(argv):
+    # Parse command line arguments
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-o', dest='output', metavar='file', type=str,
+                        help='Output file name. Defaults to standard output if not specified.')
+    parser.add_argument('input', type=str,
+                        help='Input file name.')
+    parser.add_argument('template', type=str,
+                        help='Template file name.')
+    args = parser.parse_args(argv[1:])
+
+    data = open(args.input, 'rb').read()
+    controls = yaml.safe_load(data)['controls']
+
+    data = generate_py(controls)
+
+    data = fill_template(args.template, data)
+
+    if args.output:
+        output = open(args.output, 'wb')
+        output.write(data.encode('utf-8'))
+        output.close()
+    else:
+        sys.stdout.write(data)
+
+    return 0
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))
diff --git a/src/py/libcamera/meson.build b/src/py/libcamera/meson.build
index fce9fd5e..b4ee0171 100644
--- a/src/py/libcamera/meson.build
+++ b/src/py/libcamera/meson.build
@@ -17,6 +17,18 @@  pycamera_sources = files([
     'pymain.cpp',
 ])
 
+gen_input_files = [
+    meson.project_source_root() / 'src' / 'libcamera' / 'control_ids.yaml',
+    'pyenums_generated.cpp.in',
+]
+
+generated_sources = custom_target('py_gen_controls',
+                                  input : gen_input_files,
+                                  output : ['pyenums_generated.cpp'],
+                                  command : ['gen-py-control-enums.py', '-o', '@OUTPUT@', '@INPUT@'])
+
+pycamera_sources += generated_sources
+
 pycamera_deps = [
     libcamera_public,
     py3_dep,
diff --git a/src/py/libcamera/pyenums_generated.cpp.in b/src/py/libcamera/pyenums_generated.cpp.in
new file mode 100644
index 00000000..96daf257
--- /dev/null
+++ b/src/py/libcamera/pyenums_generated.cpp.in
@@ -0,0 +1,21 @@ 
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
+ *
+ * Python bindings
+ *
+ * This file is auto-generated. Do not edit.
+ */
+
+#include <libcamera/libcamera.h>
+
+#include <pybind11/smart_holder.h>
+
+namespace py = pybind11;
+
+using namespace libcamera;
+
+void init_pyenums_generated(py::module& m)
+{
+${enums}
+}
diff --git a/src/py/libcamera/pymain.cpp b/src/py/libcamera/pymain.cpp
index ee306186..de1e9fd9 100644
--- a/src/py/libcamera/pymain.cpp
+++ b/src/py/libcamera/pymain.cpp
@@ -130,10 +130,12 @@  static void handleRequestCompleted(Request *req)
 }
 
 void init_pyenums(py::module &m);
+void init_pyenums_generated(py::module &m);
 
 PYBIND11_MODULE(_libcamera, m)
 {
 	init_pyenums(m);
+	init_pyenums_generated(m);
 
 	/* Forward declarations */