libcamera: Move Header generation utilities to utils

Move the GPL2 utilities which handle generation of controls, formats and
the top level libcamera header to the utils subtree.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>

utils/gen-controls.py

@@ -0,0 +1,173 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2019, Google Inc.
+#
+# Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+#
+# gen-controls.py - Generate control definitions from YAML
+
+import argparse
+import string
+import sys
+import yaml
+
+
+def snake_case(s):
+    return ''.join([c.isupper() and ('_' + c) or c for c in s]).strip('_')
+
+
+def format_description(description):
+    description = description.strip('\n').split('\n')
+    description[0] = '\\brief ' + description[0]
+    return '\n'.join([(line and ' * ' or ' *') + line for line in description])
+
+
+def generate_cpp(controls):
+    enum_doc_start_template = string.Template('''/**
+ * \\enum ${name}Values
+ * \\brief Supported ${name} values''')
+    enum_doc_value_template = string.Template(''' * \\var ${name}Values::${value}
+${description}''')
+    doc_template = string.Template('''/**
+ * \\var ${name}
+${description}
+ */''')
+    def_template = string.Template('extern const Control<${type}> ${name}(${id_name}, "${name}");')
+
+    ctrls_doc = []
+    ctrls_def = []
+    ctrls_map = []
+
+    for ctrl in controls:
+        name, ctrl = ctrl.popitem()
+        id_name = snake_case(name).upper()
+
+        ctrl_type = ctrl['type']
+        if ctrl_type == 'string':
+            ctrl_type = 'std::string'
+        elif ctrl.get('size'):
+            ctrl_type = 'Span<const %s>' % ctrl_type
+
+        info = {
+            'name': name,
+            'type': ctrl_type,
+            'description': format_description(ctrl['description']),
+            'id_name': id_name,
+        }
+
+        enum = ctrl.get('enum')
+        if enum:
+            enum_doc = []
+            enum_doc.append(enum_doc_start_template.substitute(info))
+
+            for entry in enum:
+                value_info = {
+                    'name' : name,
+                    'value': entry['name'],
+                    'description': format_description(entry['description']),
+                }
+                enum_doc.append(enum_doc_value_template.substitute(value_info))
+
+            enum_doc = '\n *\n'.join(enum_doc)
+            enum_doc += '\n */'
+            ctrls_doc.append(enum_doc)
+
+        ctrls_doc.append(doc_template.substitute(info))
+        ctrls_def.append(def_template.substitute(info))
+        ctrls_map.append('\t{ ' + id_name + ', &' + name + ' },')
+
+    return {
+        'controls_doc': '\n\n'.join(ctrls_doc),
+        'controls_def': '\n'.join(ctrls_def),
+        'controls_map': '\n'.join(ctrls_map),
+    }
+
+
+def generate_h(controls):
+    enum_template_start = string.Template('''enum ${name}Values {''')
+    enum_value_template = string.Template('''\t${name} = ${value},''')
+    template = string.Template('''extern const Control<${type}> ${name};''')
+
+    ctrls = []
+    ids = []
+    id_value = 1
+
+    for ctrl in controls:
+        name, ctrl = ctrl.popitem()
+        id_name = snake_case(name).upper()
+
+        ids.append('\t' + id_name + ' = ' + str(id_value) + ',')
+
+        ctrl_type = ctrl['type']
+        if ctrl_type == 'string':
+            ctrl_type = 'std::string'
+        elif ctrl.get('size'):
+            ctrl_type = 'Span<const %s>' % ctrl_type
+
+        info = {
+            'name': name,
+            'type': ctrl_type,
+        }
+
+        enum = ctrl.get('enum')
+        if enum:
+            ctrls.append(enum_template_start.substitute(info))
+
+            for entry in enum:
+                value_info = {
+                    'name': entry['name'],
+                    'value': entry['value'],
+                }
+                ctrls.append(enum_value_template.substitute(value_info))
+            ctrls.append("};")
+
+        ctrls.append(template.substitute(info))
+        id_value += 1
+
+    return {'ids': '\n'.join(ids), 'controls': '\n'.join(ctrls)}
+
+
+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']
+
+    if args.template.endswith('.cpp.in'):
+        data = generate_cpp(controls)
+    elif args.template.endswith('.h.in'):
+        data = generate_h(controls)
+    else:
+        raise RuntimeError('Unknown template type')
+
+    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))