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A little more work on getclass and classname

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This commit is contained in:
jyelon
2026-02-21 23:58:33 -05:00
parent b1a132e252
commit f544888938
2 changed files with 47 additions and 14 deletions
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25
luprex/cpp/core/luastack.hpp
View File

@@ -833,6 +833,20 @@ public:
//
static bool validpositiveinteger(int64_t value) { return (value <= MAXINT) && (value >= 1); }
// Get the class table and class name of X.
//
// The object passed in can be:
//
// * A valid class table.
// * A valid, existing class name.
// * A tangible that has a class.
// * A normal table with a class metatable.
//
// On success, sets classtab, classname, and clears error.
// On failure, sets classtab to nil, clears classname, and sets error.
//
void getclassinfo(LuaSlot classtab, eng::string &classname, eng::string &error, LuaSlot input) const;
// Get the class name of X.
//
// The object passed in can be:
@@ -853,12 +867,10 @@ public:
// * A valid class table.
// * A valid, existing class name.
// * A tangible that has a class.
// *
// * A normal table with a class metatable.
//
// If there is a problem, returns an error message.
// There are lots of error conditions, including such
// things as no such class, corrupted class, classname
// invalid, etc.
// If there is a problem, returns an error message
// and sets tab to nil.
//
eng::string getclass(LuaSlot tab, LuaSlot obj) const;
eng::string getclass(LuaSlot tab, std::string_view name) const;
@@ -1032,9 +1044,6 @@ public:
lua_rawseti(L_, tab, key);
}
private:
void getclassinfo(LuaSlot classtab, eng::string &classname, eng::string &error, LuaSlot input) const;
protected:
// Assign slots: this is used by the LuaDefStack and LuaExtStack

36
luprex/cpp/core/source.cpp
View File

@@ -29,18 +29,42 @@ LuaDefine(makeclass, "classname", "create a class if it doesn't already exist")
return LS.result();
}
LuaDefine(getclass, "x", "get a class table") {
LuaArg classname;
LuaDefine(getclass, "x",
"|Get the class table of X."
"|"
"|The object passed in can be:"
"|"
"| * A valid class table."
"| * A valid, existing class name."
"| * A tangible that has a class."
"| * A normal table with a class metatable."
"|"
"|On success, returns the class table."
"|On failure, throws an error."
) {
LuaArg input;
LuaRet classtab;
LuaDefStack LS(L, classname, classtab);
eng::string err = LS.getclass(classtab, classname);
if (err != "") {
LuaDefStack LS(L, input, classtab);
eng::string err = LS.getclass(classtab, input);
if (!err.empty()) {
luaL_error(L, "%s", err.c_str());
}
return LS.result();
}
LuaDefine(classname, "x", "get a class name") {
LuaDefine(classname, "x",
"|Get the class name of X."
"|"
"|The object passed in can be:"
"|"
"| * A valid class table."
"| * A valid, existing class name."
"| * A tangible that has a class."
"| * A normal table with a class metatable."
"|"
"|If the object is none of these, returns empty string."
"|This function does not throw errors."
) {
LuaArg table;
LuaRet result;
LuaDefStack LS(L, table, result);