Allow mwscript variable iteration

apps/openmw/mwlua/mwscriptbindings.cpp

@@ -1,5 +1,6 @@
 #include "mwscriptbindings.hpp"
 
+#include <components/compiler/locals.hpp>
 #include <components/lua/luastate.hpp>
 #include <components/misc/strings/lower.hpp>
 
@@ -143,18 +144,75 @@ namespace MWLua
         });
         mwscript["player"] = sol::readonly_property(
             [](const MWScriptRef&) { return GObject(MWBase::Environment::get().getWorld()->getPlayerPtr()); });
-        mwscriptVars[sol::meta_function::index]
-            = [](MWScriptVariables& s, std::string_view var) -> sol::optional<double> {
+        mwscriptVars[sol::meta_function::length]
+            = [](MWScriptVariables& s) { return s.mRef.getLocals().getSize(s.mRef.mId); };
+        mwscriptVars[sol::meta_function::index] = sol::overload(
+            [](MWScriptVariables& s, std::string_view var) -> sol::optional<double> {
                 if (s.mRef.getLocals().hasVar(s.mRef.mId, var))
                     return s.mRef.getLocals().getVarAsDouble(s.mRef.mId, Misc::StringUtils::lowerCase(var));
                 else
                     return sol::nullopt;
-        };
-        mwscriptVars[sol::meta_function::new_index] = [](MWScriptVariables& s, std::string_view var, double val) {
+            },
+            [](MWScriptVariables& s, std::size_t index) -> sol::optional<double> {
+                auto& locals = s.mRef.getLocals();
+                if (index < 1 || locals.getSize(s.mRef.mId) < index)
+                    return sol::nullopt;
+                if (index <= locals.mShorts.size())
+                    return locals.mShorts[index - 1];
+                index -= locals.mShorts.size();
+                if (index <= locals.mLongs.size())
+                    return locals.mLongs[index - 1];
+                index -= locals.mLongs.size();
+                if (index <= locals.mFloats.size())
+                    return locals.mFloats[index - 1];
+                return sol::nullopt;
+            });
+        mwscriptVars[sol::meta_function::new_index] = sol::overload(
+            [](MWScriptVariables& s, std::string_view var, double val) {
                 MWScript::Locals& locals = s.mRef.getLocals();
                 if (!locals.setVar(s.mRef.mId, Misc::StringUtils::lowerCase(var), val))
                     throw std::runtime_error(
                         "No variable \"" + std::string(var) + "\" in mwscript " + s.mRef.mId.toDebugString());
+            },
+            [](MWScriptVariables& s, std::size_t index, double val) {
+                auto& locals = s.mRef.getLocals();
+                if (index < 1 || locals.getSize(s.mRef.mId) < index)
+                    throw std::runtime_error("Index out of range in mwscript " + s.mRef.mId.toDebugString());
+                if (index <= locals.mShorts.size())
+                {
+                    locals.mShorts[index - 1] = static_cast<Interpreter::Type_Short>(val);
+                    return;
+                }
+                index -= locals.mShorts.size();
+                if (index <= locals.mLongs.size())
+                {
+                    locals.mLongs[index - 1] = static_cast<Interpreter::Type_Integer>(val);
+                    return;
+                }
+                index -= locals.mLongs.size();
+                if (index <= locals.mFloats.size())
+                    locals.mFloats[index - 1] = static_cast<Interpreter::Type_Float>(val);
+            });
+        mwscriptVars[sol::meta_function::pairs] = [](MWScriptVariables& s) {
+            std::size_t index = 0;
+            const auto& compilerLocals = MWBase::Environment::get().getScriptManager()->getLocals(s.mRef.mId);
+            auto& locals = s.mRef.getLocals();
+            std::size_t size = locals.getSize(s.mRef.mId);
+            return sol::as_function(
+                [&, index, size](sol::this_state ts) mutable -> sol::optional<std::tuple<std::string_view, double>> {
+                    if (index >= size)
+                        return sol::nullopt;
+                    auto i = index++;
+                    if (i <= locals.mShorts.size())
+                        return std::make_tuple<std::string_view, double>(compilerLocals.get('s')[i], locals.mShorts[i]);
+                    i -= locals.mShorts.size();
+                    if (i <= locals.mLongs.size())
+                        return std::make_tuple<std::string_view, double>(compilerLocals.get('l')[i], locals.mLongs[i]);
+                    i -= locals.mLongs.size();
+                    if (i <= locals.mFloats.size())
+                        return std::make_tuple<std::string_view, double>(compilerLocals.get('f')[i], locals.mFloats[i]);
+                    return sol::nullopt;
+                });
         };
 
         using GlobalStore = MWWorld::Store<ESM::Global>;
@@ -222,5 +280,4 @@ namespace MWLua
         };
         return LuaUtil::makeReadOnly(api);
     }
-
 }

apps/openmw/mwscript/locals.cpp

@@ -121,6 +121,12 @@ namespace MWScript
         return true;
     }
 
+    std::size_t Locals::getSize(const ESM::RefId& script)
+    {
+        ensure(script);
+        return mShorts.size() + mLongs.size() + mFloats.size();
+    }
+
     bool Locals::write(ESM::Locals& locals, const ESM::RefId& script) const
     {
         if (!mInitialised)

apps/openmw/mwscript/locals.hpp

@@ -67,6 +67,8 @@ namespace MWScript
             return static_cast<float>(getVarAsDouble(script, var));
         }
 
+        std::size_t getSize(const ESM::RefId& script);
+
         /// \note If locals have not been configured yet, no data is written.
         ///
         /// \return Locals written?