61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
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// Helloworld sample module
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#include "esp_log.h"
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#include "lauxlib.h"
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#include "lnodeaux.h"
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#include "module.h"
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static const char* HELLOWORLD_METATABLE = NODEMCU_MODULE_METATABLE();
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// hello_context_t struct contains information to wrap a "hello world object"
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typedef struct {
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char* my_name; // pointer to the greeter's name
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} hello_context_t;
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// Lua: helloworldobj:hello(text)
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static int helloworld_hello(lua_State* L) {
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hello_context_t* context = (hello_context_t*)luaL_checkudata(L, 1, HELLOWORLD_METATABLE);
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printf("Hello, %s: %s\n", context->my_name, luaL_optstring(L, 2, "How are you?"));
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return 0;
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}
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// helloworld_delete is called on garbage collection
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static int helloworld_delete(lua_State* L) {
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hello_context_t* context = (hello_context_t*)luaL_checkudata(L, 1, HELLOWORLD_METATABLE);
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printf("Helloworld object with name '%s' garbage collected\n", context->my_name);
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luaX_free_string(L, context->my_name);
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return 0;
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}
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// Lua: modulename.new(string)
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static int helloworld_new(lua_State* L) {
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//create a new lua userdata object and initialize to 0.
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hello_context_t* context = (hello_context_t*)lua_newuserdata(L, sizeof(hello_context_t));
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context->my_name = luaX_alloc_string(L, 1, 100);
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luaL_getmetatable(L, HELLOWORLD_METATABLE);
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lua_setmetatable(L, -2);
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return 1; //one object returned, the helloworld context wrapped in a lua userdata object
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}
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// object function map:
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LROT_BEGIN(helloworld_metatable)
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LROT_FUNCENTRY(hello, helloworld_hello)
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LROT_FUNCENTRY(__gc, helloworld_delete)
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LROT_TABENTRY(__index, helloworld_metatable)
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LROT_END(helloworld_metatable, NULL, 0)
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// Module function map
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LROT_BEGIN(module)
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LROT_FUNCENTRY(new, helloworld_new)
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LROT_END(module, NULL, 0)
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// module_init is invoked on device startup
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static int module_init(lua_State* L) {
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luaL_rometatable(L, HELLOWORLD_METATABLE, (void*)helloworld_metatable_map); // create metatable for helloworld
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return 0;
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}
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NODEMCU_MODULE_STD(); // define Lua entries
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