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annotate src/libmlk-core-js/core/js-state.c @ 378:460c78706989

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misc: update copyright years
author David Demelier <markand@malikania.fr>
date Sun, 02 Jan 2022 10:22:48 +0100
parents 3c378be73844
children
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1 /*
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2 * js-state.c -- core state binding
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3 *
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4 * Copyright (c) 2020-2022 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <stdlib.h>
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21
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22 #include <core/alloc.h>
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23 #include <core/state.h>
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24
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25 #include "js-event.h"
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26 #include "js-state.h"
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27
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28 #define SIGNATURE DUK_HIDDEN_SYMBOL("Mlk.State")
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30 static inline duk_context *
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31 callable(struct js_state *data, const char *prop)
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32 {
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33 duk_context *ctx;
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35 if (!data->ptr)
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36 return NULL;
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37
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38 duk_push_heapptr(data->ctx, data->ptr);
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39 duk_get_prop_string(data->ctx, -1, prop);
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40 duk_pull(data->ctx, -2);
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41
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42 if (duk_is_callable(data->ctx, -2))
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43 ctx = data->ctx;
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44 else {
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45 ctx = NULL;
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46 duk_pop_n(data->ctx, 2);
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47 }
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48
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49 return ctx;
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50 }
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51
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52 static void
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53 start(struct state *state)
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54 {
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55 duk_context *ctx;
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56
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57 if ((ctx = callable(state->data, "start"))) {
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58 duk_call_method(ctx, 0);
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59 duk_pop(ctx);
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60 }
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61 }
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62
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63 static void
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64 handle(struct state *state, const union event *ev)
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65 {
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66 duk_context *ctx;
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67
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68 if ((ctx = callable(state->data, "handle"))) {
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69 js_event_push(ctx, ev);
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70 duk_call_method(ctx, 1);
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71 duk_pop(ctx);
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72 }
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73 }
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74
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75 static void
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76 update(struct state *state, unsigned int ticks)
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77 {
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78 duk_context *ctx;
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79
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80 if ((ctx = callable(state->data, "update"))) {
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81 duk_push_uint(ctx, ticks);
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82 duk_call_method(ctx, 1);
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83 duk_pop(ctx);
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84 }
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85 }
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86
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87 static void
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88 draw(struct state *state)
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89 {
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90 duk_context *ctx;
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91
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92 if ((ctx = callable(state->data, "draw"))) {
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93 duk_call_method(ctx, 0);
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94 duk_pop(ctx);
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95 }
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96 }
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97
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98 static void
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99 suspend(struct state *state)
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100 {
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101 duk_context *ctx;
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102
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103 if ((ctx = callable(state->data, "suspend"))) {
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104 duk_call_method(ctx, 0);
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105 duk_pop(ctx);
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106 }
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107 }
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108
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109 static void
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110 resume(struct state *state)
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111 {
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112 duk_context *ctx;
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113
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114 if ((ctx = callable(state->data, "resume"))) {
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115 duk_call_method(ctx, 0);
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116 duk_pop(ctx);
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117 }
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118 }
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119
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120 static void
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121 end(struct state *state)
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122 {
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123 duk_context *ctx;
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124
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125 if ((ctx = callable(state->data, "end"))) {
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126 duk_call_method(ctx, 0);
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127 duk_pop(ctx);
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128 }
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129 }
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130
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131 static void
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132 finish(struct state *state)
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133 {
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134 struct js_state *data = state->data;
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135
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136 /* I must not be called anymore. */
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137 data->ptr = NULL;
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138
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139 /* Remove myself from parent stack if any. */
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140 if (data->parent) {
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141 duk_push_heapptr(data->ctx, data->parent);
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142 duk_push_sprintf(data->ctx, "%p", data);
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143 duk_del_prop(data->ctx, -2);
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144 duk_pop(data->ctx);
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145 data->parent = NULL;
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146 }
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147
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148 if (--data->refc == 0)
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149 free(data);
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150 }
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151
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152 static duk_ret_t
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153 State_constructor(duk_context *ctx)
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154 {
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155 struct js_state *data;
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156
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157 data = alloc_new0(sizeof (*data));
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158 data->ctx = ctx;
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159 data->refc = 1;
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160 data->st.data = data;
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161 data->st.start = start;
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162 data->st.handle = handle;
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163 data->st.update = update;
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164 data->st.draw = draw;
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165 data->st.suspend = suspend;
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166 data->st.resume = resume;
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167 data->st.end = end;
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168 data->st.finish = finish;
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169
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170 duk_push_this(ctx);
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171 data->ptr = duk_get_heapptr(ctx, -1);
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172 duk_push_pointer(ctx, data);
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173 duk_put_prop_string(ctx, -2, SIGNATURE);
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174 duk_pop(ctx);
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175
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176 return 0;
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177 }
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178
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179 static duk_ret_t
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180 State_destructor(duk_context *ctx)
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181 {
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182 struct js_state *data;
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183
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184 duk_get_prop_string(ctx, 0, SIGNATURE);
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185
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186 if ((data = duk_to_pointer(ctx, -1)))
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187 state_finish(&data->st);
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188
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189 duk_pop(ctx);
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190
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191 return 0;
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192 }
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193
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194 void
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195 js_state_bind(duk_context *ctx)
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196 {
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197 assert(ctx);
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198
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199 duk_push_c_function(ctx, State_constructor, 1);
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200 duk_push_object(ctx);
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201 duk_push_c_function(ctx, State_destructor, 1);
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202 duk_set_finalizer(ctx, -2);
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203 duk_put_prop_string(ctx, -2, "prototype");
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204 duk_put_global_string(ctx, "State");
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205 }
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206
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207 struct js_state *
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208 js_state_require(duk_context *ctx, duk_idx_t idx)
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209 {
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210 struct js_state *data = NULL;
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211
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212 if (duk_is_object(ctx, idx)) {
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213 duk_get_prop_string(ctx, idx, SIGNATURE);
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214 data = duk_to_pointer(ctx, -1);
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215 duk_pop(ctx);
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216 }
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217
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218 if (!data)
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219 return (void)duk_error(ctx, DUK_ERR_TYPE_ERROR, "not a State object"), NULL;
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220
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221 data->refc++;
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222
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223 return data;
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224 }