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Better error messages for some polymorphic functions

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New auxiliary functions/macros 'luaL_argexpected'/'luaL_typeerror'
ease the creation of error messages such as

  bad argument #2 to 'setmetatable' (nil or table expected, got boolean)

(The novelty being the "got boolean" part...)
This commit is contained in:
Roberto Ierusalimschy
2018-12-10 13:46:03 -02:00
parent 28d829c867
commit 46beca5bed
7 changed files with 41 additions and 12 deletions
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6
lauxlib.c
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@@ -185,7 +185,7 @@ LUALIB_API int luaL_argerror (lua_State *L, int arg, const char *extramsg) {
}
static int typeerror (lua_State *L, int arg, const char *tname) {
int luaL_typeerror (lua_State *L, int arg, const char *tname) {
const char *msg;
const char *typearg; /* name for the type of the actual argument */
if (luaL_getmetafield(L, arg, "__name") == LUA_TSTRING)
@@ -200,7 +200,7 @@ static int typeerror (lua_State *L, int arg, const char *tname) {
static void tag_error (lua_State *L, int arg, int tag) {
typeerror(L, arg, lua_typename(L, tag));
luaL_typeerror(L, arg, lua_typename(L, tag));
}
@@ -339,7 +339,7 @@ LUALIB_API void *luaL_testudata (lua_State *L, int ud, const char *tname) {
LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
void *p = luaL_testudata(L, ud, tname);
if (p == NULL) typeerror(L, ud, tname);
luaL_argexpected(L, p != NULL, ud, tname);
return p;
}