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/*
* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
* Copyright (c) 2021, Peter Elliott <pelliott@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Noncopyable.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/RecursionDecision.h>
#include <AK/String.h>
#include <LibMarkdown/Forward.h>
namespace Markdown {
class Text final {
public:
class Node {
public:
virtual void render_to_html(StringBuilder& builder) const = 0;
virtual void render_for_terminal(StringBuilder& builder) const = 0;
virtual size_t terminal_length() const = 0;
virtual RecursionDecision walk(Visitor&) const = 0;
virtual ~Node() { }
};
class EmphasisNode : public Node {
public:
bool strong;
NonnullOwnPtr<Node> child;
EmphasisNode(bool strong, NonnullOwnPtr<Node> child)
: strong(strong)
, child(move(child))
{
}
virtual void render_to_html(StringBuilder& builder) const override;
virtual void render_for_terminal(StringBuilder& builder) const override;
virtual size_t terminal_length() const override;
virtual RecursionDecision walk(Visitor&) const override;
};
class CodeNode : public Node {
public:
NonnullOwnPtr<Node> code;
CodeNode(NonnullOwnPtr<Node> code)
: code(move(code))
{
}
virtual void render_to_html(StringBuilder& builder) const override;
virtual void render_for_terminal(StringBuilder& builder) const override;
virtual size_t terminal_length() const override;
virtual RecursionDecision walk(Visitor&) const override;
};
class BreakNode : public Node {
public:
virtual void render_to_html(StringBuilder& builder) const override;
virtual void render_for_terminal(StringBuilder& builder) const override;
virtual size_t terminal_length() const override;
virtual RecursionDecision walk(Visitor&) const override;
};
class TextNode : public Node {
public:
String text;
bool collapsible;
TextNode(StringView text)
: text(text)
, collapsible(true)
{
}
TextNode(StringView text, bool collapsible)
: text(text)
, collapsible(collapsible)
{
}
virtual void render_to_html(StringBuilder& builder) const override;
virtual void render_for_terminal(StringBuilder& builder) const override;
virtual size_t terminal_length() const override;
virtual RecursionDecision walk(Visitor&) const override;
};
class LinkNode : public Node {
public:
bool is_image;
NonnullOwnPtr<Node> text;
String href;
LinkNode(bool is_image, NonnullOwnPtr<Node> text, String href)
: is_image(is_image)
, text(move(text))
, href(move(href))
{
}
virtual void render_to_html(StringBuilder& builder) const override;
virtual void render_for_terminal(StringBuilder& builder) const override;
virtual size_t terminal_length() const override;
virtual RecursionDecision walk(Visitor&) const override;
};
class MultiNode : public Node {
public:
NonnullOwnPtrVector<Node> children;
virtual void render_to_html(StringBuilder& builder) const override;
virtual void render_for_terminal(StringBuilder& builder) const override;
virtual size_t terminal_length() const override;
virtual RecursionDecision walk(Visitor&) const override;
};
size_t terminal_length() const;
String render_to_html() const;
String render_for_terminal() const;
RecursionDecision walk(Visitor&) const;
static Text parse(StringView);
private:
struct Token {
String data;
// Flanking basically means that a delimiter run has a non-whitespace,
// non-punctuation character on the corresponding side. For a more exact
// definition, see the CommonMark spec.
bool left_flanking;
bool right_flanking;
bool punct_before;
bool punct_after;
// is_run indicates that this token is a 'delimiter run'. A delimiter
// run occurs when several of the same sytactical character ('`', '_',
// or '*') occur in a row.
bool is_run;
char run_char() const
{
VERIFY(is_run);
return data[0];
}
char run_length() const
{
VERIFY(is_run);
return data.length();
}
bool is_space() const
{
return data[0] == ' ';
}
bool operator==(StringView str) const { return str == data; }
};
static Vector<Token> tokenize(StringView);
static bool can_open(Token const& opening);
static bool can_close_for(Token const& opening, Token const& closing);
static NonnullOwnPtr<MultiNode> parse_sequence(Vector<Token>::ConstIterator& tokens, bool in_link);
static NonnullOwnPtr<Node> parse_break(Vector<Token>::ConstIterator& tokens);
static NonnullOwnPtr<Node> parse_newline(Vector<Token>::ConstIterator& tokens);
static NonnullOwnPtr<Node> parse_emph(Vector<Token>::ConstIterator& tokens, bool in_link);
static NonnullOwnPtr<Node> parse_code(Vector<Token>::ConstIterator& tokens);
static NonnullOwnPtr<Node> parse_link(Vector<Token>::ConstIterator& tokens);
OwnPtr<Node> m_node;
};
}
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