string_holder.h

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#pragma once
 
#include "fl/stl/int.h"
#include "fl/stl/cstring.h"
#include "fl/stl/noexcept.h"
 
namespace fl {
 
// StringHolder: Heap-allocated string storage with reference counting
// Used when string exceeds inline buffer size
class StringHolder {
  public:
    StringHolder(const char *str) FL_NOEXCEPT;
    StringHolder(size length) FL_NOEXCEPT;
    StringHolder(const char *str, size length) FL_NOEXCEPT;
    StringHolder(const StringHolder &other) FL_NOEXCEPT = delete;
    StringHolder &operator=(const StringHolder &other) FL_NOEXCEPT = delete;
    ~StringHolder() FL_NOEXCEPT;
 
    void grow(size newLength) FL_NOEXCEPT;
    bool hasCapacity(size newLength) const FL_NOEXCEPT { return newLength + 1 <= mCapacity; }
    const char *data() const FL_NOEXCEPT { return mData; }
    char *data() FL_NOEXCEPT { return mData; }
    size length() const FL_NOEXCEPT { return mLength; }
    size capacity() const FL_NOEXCEPT { return mCapacity; }
    bool copy(const char *str, size len) FL_NOEXCEPT {
        if ((len + 1) > mCapacity) {
            return false;
        }
        memcpy(mData, str, len);
        mData[len] = '\0';
        mLength = len;
        return true;
    }
 
  private:
    char* mData;
    size mLength = 0;
    size mCapacity = 0;
};
 
} // namespace fl