minor fixes

src/indent_stack.hpp

@@ -0,0 +1,79 @@
+#pragma once
+#include <stack>
+enum class IndentAction
+{
+    Indent,
+    Dedent,
+    None
+};
+
+constexpr int TAB_WIDTH = 8;
+
+class IndentStack
+{
+    std::stack<int> indent_stack;
+    int pending_dedents = 0;
+
+public:
+    IndentStack() { indent_stack.push(0); }
+
+    IndentAction updateIndentation(int spaces)
+    {
+        int current = indent_stack.top();
+
+        if (spaces == current)
+        {
+            return IndentAction::None;
+        }
+
+        if (spaces > current)
+        {
+            indent_stack.push(spaces);
+            return IndentAction::Indent;
+        }
+
+        while (indent_stack.top() > spaces)
+        {
+            indent_stack.pop();
+            pending_dedents++;
+        }
+
+        if (pending_dedents > 0)
+        {
+            pending_dedents--;
+            return IndentAction::Dedent;
+        }
+
+        return IndentAction::None;
+    }
+
+    bool popDedent()
+    {
+        if (pending_dedents <= 0)
+        {
+            return false;
+        }
+        pending_dedents--;
+        return true;
+    }
+
+    static int calculateColumn(const char *text, int length)
+    {
+        int spaces = 0;
+        for (int i = 0; i < length; i++)
+        {
+            spaces += (text[i] == '\t') ? TAB_WIDTH : 1;
+        }
+        return spaces;
+    }
+
+    bool hasRemainingDedents()
+    {
+        return pending_dedents > 0;
+    }
+
+    IndentAction closeBlock()
+    {
+        return updateIndentation(0);
+    }
+};