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document where tagged unions should be implemented for Lua

develop
Ben Lubar 2020-03-06 16:33:02 -06:00
parent 635e709d95
commit 508ab79af2
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GPG Key ID: 92939677AB59EDA4
1 changed files with 17 additions and 0 deletions
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17
library/LuaTypes.cpp
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@ -1165,6 +1165,7 @@ static void IndexFields(lua_State *state, int base, struct_identity *pstruct, bo
lua_pop(state, 1);
bool add_to_enum = true;
const struct_field_info *tag_field = nullptr;
// Handle the field
switch (fields[i].mode)
@ -1183,6 +1184,11 @@ static void IndexFields(lua_State *state, int base, struct_identity *pstruct, bo
add_to_enum = false;
break;
case struct_field_info::SUBSTRUCT:
case struct_field_info::CONTAINER:
tag_field = find_union_tag(fields, &fields[i]);
break;
default:
break;
}
@ -1194,6 +1200,17 @@ static void IndexFields(lua_State *state, int base, struct_identity *pstruct, bo
if (add_to_enum)
AssociateId(state, base+3, ++cnt, name.c_str());
if (tag_field)
{
// TODO: handle tagged unions
//
// tagged unions are treated as if they have at most one field,
// with the same name as the corresponding enumeration value.
//
// if no field's name matches the enumeration value's name,
// the tagged union is treated as a structure with no fields.
}
lua_pushlightuserdata(state, (void*)&fields[i]);
lua_setfield(state, base+2, name.c_str());
}