syntactic-decomposition.h

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Authors: Rafał Siejakowski <rs@rs-math.net>
 *
 * Copyright (C) 2025 Authors
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
 
#ifndef INKSCAPE_CSS_SYNTACTIC_DECOMPOSITION_H
#define INKSCAPE_CSS_SYNTACTIC_DECOMPOSITION_H
 
#include <algorithm>
#include <memory>
#include <string>
#include <variant>
#include <vector>
 
using CRSelector = struct _CRSelector;
 
namespace Inkscape::CSS {
 
class SyntacticDecomposition;
 
struct RuleStatement
{
    std::string selectors; 
    std::string rules;     
};
 
struct BlockAtStatement
{
    std::string at_statement;
    std::unique_ptr<SyntacticDecomposition> block_content;
};
 
using OtherStatement = std::string;
 
using SyntacticElement = std::variant<RuleStatement, BlockAtStatement, OtherStatement>;
 
template <class F>
concept SyntacticElementHandler =
    requires(RuleStatement const &rule, BlockAtStatement const &block, OtherStatement const &other, F f) {
        f(rule);
        f(block);
        f(other);
    };
 
class SyntacticDecomposition
{
public:
    explicit SyntacticDecomposition(std::string const &css);
 
    explicit SyntacticDecomposition(std::vector<SyntacticElement> elements)
        : _elements{std::move(elements)}
    {}
 
    [[nodiscard]] bool empty() const { return _elements.empty(); }
 
    void for_each(SyntacticElementHandler auto &&handler) const
    {
        std::for_each(_elements.begin(), _elements.end(),
                      [&handler, this](auto const &element) { std::visit(handler, element); });
    }
 
private:
    std::vector<SyntacticElement> _elements;
};
 
std::string selector_to_validated_string(CRSelector const &croco_selector);
 
} // namespace Inkscape::CSS
 
#endif // INKSCAPE_CSS_SYNTACTIC_DECOMPOSITION_H
/*
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  End:
*/
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