utils/gen-controls.py


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#!/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}Enum
 * \\brief Supported ${name} values''')
    enum_doc_value_template = string.Template(''' * \\var ${value}
${description}''')
    doc_template = string.Template('''/**
 * \\var ${name}
${description}
 */''')
    def_template = string.Template('extern const Control<${type}> ${name}(${id_name}, "${name}");')
    enum_values_doc = string.Template('''/**
 * \\var ${name}Values
 * \\brief List of all $name supported values
 */''')
    enum_values_start = string.Template('''extern const std::array<const ControlValue, ${size}> ${name}Values = {''')
    enum_values_values = string.Template('''\tstatic_cast<int32_t>(${name}),''')

    ctrls_doc = []
    ctrls_def = []
    draft_ctrls_doc = []
    draft_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,
        }

        target_doc = ctrls_doc
        target_def = ctrls_def
        if ctrl.get('draft'):
            target_doc = draft_ctrls_doc
            target_def = draft_ctrls_def

        enum = ctrl.get('enum')
        if enum:
            enum_doc = []
            enum_doc.append(enum_doc_start_template.substitute(info))

            num_entries = 0
            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))
                num_entries += 1