loom

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/*
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MIT License
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Copyright (c) 2022 МГТУ им. Н.Э. Баумана, кафедра ИУ-6, Михаил Фетисов,
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https://bmstu.codes/lsx/simodo/loom
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*/
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#include "simodo/variable/VariableStack.h"
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#include "simodo/bormental/DrBormental.h"
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#include "simodo/inout/format/fmt.h"
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namespace simodo::variable
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{
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    VariableStack::VariableStack(size_t stack_size)
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    {
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        _stack.reserve(stack_size);
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    }
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    void VariableStack::push(Variable v)
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    {
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        size_t size     = _stack.size();
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        size_t capacity = _stack.capacity();
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        if (size >= capacity)
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            throw bormental::DrBormental("VariableStack::push", 
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                            inout::fmt("SBL variable stack overflow occurred (size: %1)")
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                            .arg(size));
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        _stack.push_back(v);
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    }
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    Variable VariableStack::pop() 
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    {
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        if (_stack.size() == 0)
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            throw bormental::DrBormental("VariableStack::pop", 
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                            inout::fmt("Attempt to pop an element from the empty SBL variable stack"));
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        Variable v = _stack.back();
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        _stack.pop_back();
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        return v;
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    }
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    void VariableStack::popAmount(size_t n)
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    {
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        if (n > _stack.size())
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            throw bormental::DrBormental("VariableStack::popAmount", 
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                            inout::fmt("Attempt to pop too many elements (%1) from variable stack (size: %2)")
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                            .arg(n)
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                            .arg(_stack.size()));
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        while(n--)
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            _stack.pop_back();
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    }
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    const Variable & VariableStack::top(size_t shift_from_top) const 
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    {
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        if (shift_from_top >= _stack.size())
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            throw bormental::DrBormental("VariableStack::top", 
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                            inout::fmt("Attempt to handle invalid offset (%1) in variable stack (size: %2)")
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                            .arg(shift_from_top)
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                            .arg(_stack.size()));
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        return _stack[_stack.size()-shift_from_top-1];
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    }
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    Variable & VariableStack::top(size_t shift_from_top)
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    {
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        if (shift_from_top >= _stack.size())
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            throw bormental::DrBormental("VariableStack::top", 
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                            inout::fmt("Attempt to handle invalid offset (%1) in variable stack (size: %2)")
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                            .arg(shift_from_top)
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                            .arg(_stack.size()));
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        return _stack[_stack.size()-shift_from_top-1];
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    }
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    const Variable & VariableStack::at(size_t index) const
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    {
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        if (index > _stack.size())
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            throw bormental::DrBormental("VariableStack::at", 
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                            inout::fmt("Attempt to handle invalid offset (%1) in variable stack (size: %2)")
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                            .arg(index)
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                            .arg(_stack.size()));
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        return _stack[index]; // -V557
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    }
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    Variable & VariableStack::at(size_t index)
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    {
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        if (index > _stack.size())
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            throw bormental::DrBormental("VariableStack::at", 
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                            inout::fmt("Attempt to handle invalid offset (%1) in variable stack (size: %2)")
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                            .arg(index)
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                            .arg(_stack.size()));
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        return _stack[index]; // -V557
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    }
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    std::shared_ptr<variable::Object> VariableStack::convertToObject(size_t stack_start_position)
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    {
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        std::shared_ptr<variable::Object> ret = std::make_shared<variable::Object>();
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        for(size_t i=stack_start_position; i < stack().size(); ++i)
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            ret->add(stack().at(i).copyVariable());
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        popAmount(stack().size() - stack_start_position);
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        return ret;
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    }
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}