aboutsummaryrefslogtreecommitdiffstats
path: root/generate-binding-glue.py
blob: 790ef40c2a1f896bd31993ebaa66670f25dfa72f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
#!/usr/bin/python3

#
# Copyright (c) 2017 TOYOTA MOTOR CORPORATION
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

import sys

OUT = sys.stdout

def set_output(f):
    global OUT
    OUT = f

def p(*args):
    OUT.write('\n'.join(args))
    OUT.write('\n')

def emit_func_impl(api, f):
    args = f.get('args', [])
    func_name = f.get('name', [])
    if "wm_subscribe" == func_name:
        p('   json_object *jreq = afb_req_json(req);')
        p('   json_object *j = nullptr;')
        p('   if (! json_object_object_get_ex(jreq, "event", &j)) {')
        p('      afb_req_fail(req, "failed", "Need char const* argument event");')
        p('      return;')
        p('   }')
        p('   int event_type = json_object_get_int(j);')
        p('   const char *event_name = g_afb_instance->app.kListEventName[event_type];')
        p('   struct afb_event event = g_afb_instance->app.map_afb_event[event_name];')
        p('   int ret = afb_req_subscribe(req, event);')
        p('   if (ret) {',
          '      afb_req_fail(req, "failed", "Error: afb_req_subscribe()");',
          '      return;',
          '   }')
        p('   afb_req_success(req, NULL, "success");')

    else:
        if len(args) > 0:
            p('   json_object *jreq = afb_req_json(req);', '')
            for arg in args:
                arg['jtype'] = arg.get('jtype', arg['type']) # add jtype default
                p('   json_object *j_%(name)s = nullptr;' % arg,
                  '   if (! json_object_object_get_ex(jreq, "%(name)s", &j_%(name)s)) {' % arg,
                  '      afb_req_fail(req, "failed", "Need %(type)s argument %(name)s");' % arg,
                  '      return;',
                  '   }',
                  '   %(type)s a_%(name)s = json_object_get_%(jtype)s(j_%(name)s);' % arg, '')
        p('   auto ret = %(api)s' % api + '%(name)s(' % f + ', '.join(map(lambda x: 'a_' + x['name'], args)) + ');')
        p('   if (ret.is_err()) {',
          '      afb_req_fail(req, "failed", ret.unwrap_err());',
          '      return;',
          '   }', '')
        p('   afb_req_success(req, ret.unwrap(), "success");')

def emit_func(api, f):
    p('void %(impl_name)s(afb_req req) noexcept {' % f)
    p('   std::lock_guard<std::mutex> guard(binding_m);')
    p('   #ifdef ST')
    p('   ST();')
    p('   #endif')
    p('   if (g_afb_instance == nullptr) {',
      '      afb_req_fail(req, "failed", "Binding not initialized, did the compositor die?");',
      '      return;',
      '   }', '',
      '   try {', '   // BEGIN impl')
    emit_func_impl(api, f)
    p('   // END impl',
      '   } catch (std::exception &e) {',
      '      afb_req_fail_f(req, "failed", "Uncaught exception while calling %(name)s: %%s", e.what());' % f,
      '      return;',
      '   }', '')
    p('}', '')

def emit_afb_verbs(api):
    p('const struct afb_verb_v2 %(name)s_verbs[] = {' % api)
    for f in api['functions']:
        p('   { "%(name)s", %(impl_name)s, nullptr, nullptr, AFB_SESSION_NONE },' % f)
    p('   {}', '};')

def emit_binding(api):
    p('namespace {')
    p('std::mutex binding_m;', '')
    for func in api['functions']:
        emit_func(api, func)
    p('} // namespace', '')
    emit_afb_verbs(api)

def generate_names(api):
    for f in api['functions']:
        f['impl_name'] = '%s_%s_thunk' % (api['name'], f['name'])

def emit_afb_api(api):
    p('#include "result.hpp"', '')
    p('#include <json-c/json.h>', '')
    p('namespace wm {', '')
    p('struct App;', '')
    p('struct binding_api {')
    p('   typedef wm::result<json_object *> result_type;')
    p('   struct wm::App *app;')
    p('   void send_event(char const *evname, char const *label);')
    p('   void send_event(char const *evname, char const *label, char const *area, int x, int y, int w, int h);')
    for f in api['functions']:
        p('   result_type %(name)s(' % f + ', '.join(map(lambda x: '%(type)s %(name)s' % x, f.get('args', []))) + ');')
    p('};', '')
    p('} // namespace wm', '')

# names must always be valid in c and unique for each function (that is its arguments)
# arguments will be looked up from json request, range checking needs to be implemented
# by the actual API call
API = {
        'name': 'windowmanager',
        'api': 'g_afb_instance->app.api.', # where are our API functions
        'functions': [
            {
                'name': 'requestsurface',
                #'return_type': 'int', # Or do they return all just some json?
                'args': [ # describes the functions arguments, and their names as found in the json request
                    { 'name': 'drawing_name', 'type': 'char const*', 'jtype': 'string' },
                ],
            },
            {
                'name': 'activatesurface',
                'args': [
                    { 'name': 'drawing_name', 'type': 'char const*', 'jtype': 'string' },
                    { 'name': 'drawing_area', 'type': 'char const*', 'jtype': 'string' },
                ],
            },
            {
                'name': 'deactivatesurface',
                'args': [
                    { 'name': 'drawing_name', 'type': 'char const*', 'jtype': 'string' },
                ],
            },
            {
                'name': 'enddraw',
                'args': [
                    { 'name': 'drawing_name', 'type': 'char const*', 'jtype': 'string' },
                ],
            },

            { 'name': 'getdisplayinfo', },
            {
                'name': 'getareainfo',
                'args': [
                    { 'name': 'drawing_name', 'type': 'char const*', 'jtype': 'string' },
                ],
            },
            { 'name': 'wm_subscribe', },

            { 'name': 'list_drawing_names', },
            { 'name': 'ping' },

            { 'name': 'debug_status', },
            { 'name': 'debug_layers', },
            { 'name': 'debug_surfaces', },
            { 'name': 'debug_terminate' },
        ]
}

def main():
    with open('afb_binding_glue.inl', 'w') as out:
        set_output(out)
        p('// This file was generated, do not edit', '')
        generate_names(API)
        emit_binding(API)
    with open('afb_binding_api.hpp', 'w') as out:
        set_output(out)
        p('// This file was generated, do not edit', '')
        emit_afb_api(API)

__name__ == '__main__' and main()