From 0b533ce8809190498bf6d9094734f904a9c5dfd7 Mon Sep 17 00:00:00 2001
From: Vasilii Rogin <vasya@rogin.ru>
Date: Wed, 19 Apr 2023 23:13:02 +0300
Subject: [PATCH] Some steps with arrays

---
 src/sfall_arrays.cc | 82 +++++++++++++++++++++++++++++++++++++++++++++
 src/sfall_arrays.h  |  0
 2 files changed, 82 insertions(+)
 create mode 100644 src/sfall_arrays.cc
 create mode 100644 src/sfall_arrays.h

diff --git a/src/sfall_arrays.cc b/src/sfall_arrays.cc
new file mode 100644
index 0000000..f7529be
--- /dev/null
+++ b/src/sfall_arrays.cc
@@ -0,0 +1,82 @@
+#include "interpreter.h"
+#include <cstdint>
+#include <stdexcept>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+namespace fallout {
+
+using ArrayId = unsigned int;
+
+static ArrayId nextArrayID = 1;
+static ArrayId stackArrayId = 1;
+
+using ArraysMap = std::unordered_map<ArrayId, SFallArray>;
+
+ArraysMap arrays;
+std::unordered_set<ArrayId> temporaryArrays;
+
+class SFallArrayElement : public ProgramValue {
+public:
+    SFallArrayElement()
+    {
+        opcode = VALUE_TYPE_INT;
+        integerValue = 0;
+    }
+};
+
+#define ARRAYFLAG_ASSOC (1) // is map
+#define ARRAYFLAG_CONSTVAL (2) // don't update value of key if the key exists in map
+#define ARRAYFLAG_RESERVED (4)
+
+#define ARRAY_MAX_STRING (255) // maximum length of string to be stored as array key or value
+#define ARRAY_MAX_SIZE (100000) // maximum number of array elements,
+
+class SFallArray {
+private:
+public:
+    uint32_t flags;
+
+    SFallArray() = delete;
+
+    SFallArray(unsigned int len, uint32_t flags)
+        : flags(flags)
+    {
+        data.resize(len);
+    }
+    std::vector<SFallArrayElement> data;
+};
+
+ArrayId CreateArray(int len, uint32_t flags)
+{
+    flags = (flags & ~1); // reset 1 bit
+
+    if (len < 0) {
+        flags |= ARRAYFLAG_ASSOC;
+        throw(std::invalid_argument("Not implemented yet"));
+    };
+
+    if (len > ARRAY_MAX_SIZE) {
+        len = ARRAY_MAX_SIZE; // safecheck
+    }
+
+    SFallArray arr { len, flags };
+
+    ArrayId array_id = nextArrayID++;
+
+    stackArrayId = array_id;
+
+    arrays[array_id] = std::move(arr);
+
+    return array_id;
+}
+
+ArrayId CreateTempArray(int len, uint32_t flags)
+{
+    ArrayId array_id = CreateArray(len, flags);
+    temporaryArrays.insert(array_id);
+    return array_id;
+}
+
+}
\ No newline at end of file
diff --git a/src/sfall_arrays.h b/src/sfall_arrays.h
new file mode 100644
index 0000000..e69de29