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/*
* Copyright (c) 2021, Peter Elliott <pelliott@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Iterator.h>
#include <AK/StringView.h>
#include <AK/Vector.h>
namespace Markdown {
template<typename T>
class FakePtr {
public:
FakePtr(T item)
: m_item(move(item))
{
}
T const* operator->() const { return &m_item; }
T* operator->() { return &m_item; }
private:
T m_item;
};
class LineIterator {
public:
struct Context {
enum class Type {
ListItem,
BlockQuote,
};
Type type;
size_t indent;
bool ignore_prefix;
static Context list_item(size_t indent) { return { Type::ListItem, indent, true }; }
static Context block_quote() { return { Type::BlockQuote, 0, false }; }
};
LineIterator(Vector<StringView>::ConstIterator const& lines)
: m_iterator(lines)
{
}
bool is_end() const;
StringView operator*() const;
LineIterator operator++()
{
reset_ignore_prefix();
++m_iterator;
return *this;
}
LineIterator operator++(int)
{
LineIterator tmp = *this;
reset_ignore_prefix();
++m_iterator;
return tmp;
}
LineIterator operator+(ptrdiff_t delta) const
{
LineIterator copy = *this;
copy.reset_ignore_prefix();
copy.m_iterator = copy.m_iterator + delta;
return copy;
}
LineIterator operator-(ptrdiff_t delta) const
{
LineIterator copy = *this;
copy.reset_ignore_prefix();
copy.m_iterator = copy.m_iterator - delta;
return copy;
}
ptrdiff_t operator-(LineIterator other) const { return m_iterator - other.m_iterator; }
FakePtr<StringView> operator->() const { return FakePtr<StringView>(operator*()); }
void push_context(Context context) { m_context_stack.append(move(context)); }
void pop_context() { m_context_stack.take_last(); }
private:
void reset_ignore_prefix();
Optional<StringView> match_context(StringView const& line) const;
Vector<StringView>::ConstIterator m_iterator;
Vector<Context> m_context_stack;
};
}
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