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lbuffer.cpp
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177 lines (160 loc) · 4.5 KB
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#include "lbuffer.h"
static int32_t lbuffer_new(lua_State* L)
{
size_t cap = DEFAULT_BUFFER_CAPACITY;
const char *init = NULL;
size_t init_len = 0;
int32_t type = lua_type(L, 1);
if (type == LUA_TNUMBER) {
cap = lua_tounsigned(L, 1);
if (lua_gettop(L) > 1) {
init = luaL_checklstring(L, 2, &init_len);
}
} else if (type == LUA_TSTRING) {
init = lua_tolstring(L, 1, &init_len);
cap = init_len + DEFAULT_BUFFER_CAPACITY;
} else if (type != LUA_TNIL) {
buffer_t* buffer = (buffer_t*)luaL_testudata(L, 1, BUFFER_METATABLE);
if (!buffer) {
luaL_argerror(L, 1, "unexpected argument type");
}
create_buffer(L, *buffer);
return 1;
}
create_buffer(L, cap, init, init_len);
return 1;
}
static int32_t lbuffer_append(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
size_t len = 0;
const char* str = lua_tolstring(L, 2, &len);
if (str) {
lua_pushboolean(L, buffer_append(*buffer, str, len));
} else {
buffer_t* append = (buffer_t*)luaL_testudata(L, 2, BUFFER_METATABLE);
if (!append) {
luaL_argerror(L, 2, "unexpected argument type");
}
lua_pushboolean(L, buffer_concat(*buffer, *append));
}
return 1;
}
static int32_t lbuffer_split(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
int32_t top = lua_gettop(L);
uint32_t length = top >= 2 ? luaL_checkunsigned(L, 2) : buffer_data_length(*buffer);
buffer_t* split_buffer = create_buffer(L);
*split_buffer = buffer_split(*buffer, length);
return 1;
}
static int32_t lbuffer_clear(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
lua_pushboolean(L, buffer_clear(*buffer));
return 1;
}
static int32_t lbuffer_length(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
lua_pushinteger(L, buffer_data_length(*buffer));
return 1;
}
static int32_t lbuffer_unfill(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
lua_pushinteger(L, buffer_write_size(*buffer));
return 1;
}
static int32_t lbuffer_tostring(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
if (buffer_is_valid(*buffer)) {
lua_pushlstring(L, buffer_data_ptr(*buffer), buffer_data_length(*buffer));
} else {
lua_pushstring(L, "");
}
return 1;
}
static int32_t lbuffer_find(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
if (buffer_is_valid(*buffer)) {
int32_t top = lua_gettop(L);
if (top >= 2) {
const char* find = strstr(buffer_data_ptr(*buffer), luaL_checklstring(L, 2, NULL));
if (find) {
lua_pushinteger(L, (int32_t)(find - buffer_data_ptr(*buffer)) + 1);
return 1;
}
return 0;
} else {
lua_pushinteger(L, 1);
return 1;
}
}
return 0;
}
static int32_t lbuffer_valid(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
lua_pushboolean(L, buffer_is_valid(*buffer));
return 1;
}
static int32_t lbuffer_release(lua_State* L)
{
buffer_t* buffer = (buffer_t*)luaL_checkudata(L, 1, BUFFER_METATABLE);
if (buffer_is_valid(*buffer)) {
buffer_release(*buffer);
buffer_make_invalid(*buffer);
}
return 0;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
static luaL_Reg lbuffer[] = {
{ "new", lbuffer_new },
{ "append", lbuffer_append },
{ "split", lbuffer_split },
{ "clear", lbuffer_clear },
{ "length", lbuffer_length },
{ "unfill", lbuffer_unfill },
{ "find", lbuffer_find },
{ "tostring", lbuffer_tostring },
{ "valid", lbuffer_valid },
{ "release", lbuffer_release },
{ "__gc", lbuffer_release },
{ "__tostring", lbuffer_tostring },
{ NULL, NULL },
};
int luaopen_buffer(lua_State *L)
{
luaL_newlib(L, lbuffer);
return 1;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////
buffer_t* create_buffer(lua_State* L)
{
buffer_t* ret = (buffer_t*)lua_newuserdata(L, sizeof(buffer_t));
buffer_make_invalid(*ret);
if (luaL_newmetatable(L, BUFFER_METATABLE)) { /* create new metatable */
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
luaL_setfuncs(L, lbuffer, 0);
}
lua_setmetatable(L, -2);
return ret;
}
buffer_t* create_buffer(lua_State* L, size_t cap, const char *init, size_t init_len)
{
buffer_t* ret = create_buffer(L);
*ret = buffer_new(cap, init, init_len);
return ret;
}
buffer_t* create_buffer(lua_State* L, buffer_t& buffer)
{
buffer_t* ret = create_buffer(L);
buffer_grab(buffer);
*ret = buffer;
return ret;
}