skeleton_top_node.hpp

// Copyright Take Vos 2020.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "skeleton_node.hpp"
 
namespace tt {
 
struct skeleton_top_node final: skeleton_node {
    statement_vector children;
 
    skeleton_top_node(parse_location location) :
        skeleton_node(std::move(location)), children() {}
 
    bool append(std::unique_ptr<skeleton_node> x) noexcept override {
        append_child(children, std::move(x));
        return true;
    }
 
    void post_process(formula_post_process_context &context) override {
        if (std::ssize(children) > 0) {
            children.back()->left_align();
        }
 
        for (ttlet &child: children) {
            child->post_process(context);
        }
    }
 
    datum evaluate(formula_evaluation_context &context) override {
        try {
            return evaluate_children(context, children);
 
        } catch (...) {
            auto error_location = location;
            if (auto formula_location = error_info::peek<parse_location, "parse_location">()) {
                error_location += *formula_location;
            }
            error_info(true).set<"parse_location">(error_location);
            throw;
        }
    }
 
    std::string string() const noexcept override {
        ttlet children_str = transform<std::vector<std::string>>(children, [](ttlet &x) { return x->string(); });
        return fmt::format("<top {}>", join(children_str));
    }
};
 
}