1 files changed, 65 insertions, 0 deletions
diff --git a/libalee/state.cpp b/libalee/state.cpp
new file mode 100644
index 0000000..ea6c601
--- /dev/null
+++ b/libalee/state.cpp
@@ -0,0 +1,65 @@
+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023  Clyne Sullivan <clyne@bitgloo.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "corewords.hpp"
+#include "state.hpp"
+
+#include <iterator>
+
+bool State::compiling() const
+{
+    return dict.read(Dictionary::Compiling);
+}
+
+void State::compiling(bool yes)
+{
+    dict.write(Dictionary::Compiling, yes);
+}
+
+State::Error State::execute(Addr addr)
+{
+    auto stat = static_cast<State::Error>(setjmp(jmpbuf));
+
+    if (stat == State::Error::none) {
+        CoreWords::run(addr, *this);
+
+        if (ip >= Dictionary::Begin) {
+            // longjmp will exit this loop.
+            for (;;)
+                CoreWords::run(dict.read(ip), *this);
+        } else {
+            // addr was a CoreWord, all done now.
+            ip = 0;
+        }
+    } else if (stat == State::Error::exit) {
+        stat = State::Error::none;
+    }
+
+    return stat;
+}
+
+std::size_t State::size() const noexcept
+{
+    return std::distance(dstack, static_cast<const Cell *>(dsp)) + 1;
+}
+
+std::size_t State::rsize() const noexcept
+{
+    return std::distance(rstack, static_cast<const Cell *>(rsp)) + 1;
+}
+