examples/main.cpp

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#include <cstddef>
#include <iomanip>
#include <iostream>
#include <memory>
#include <vector>
 
#include "dbc_decode_builder.h"
#include "dbc_decoder.h"
#include "dbc_parser.h"
#include "dbc_tree_builder.h"
 
static void PrintTree(const TreeNode *node, int indent) {
    if (node == nullptr)
        return;
 
    for (int i = 0; i < indent; ++i)
        std::cout << "  ";
 
    switch (node->GetType()) {
        case NodeType::Root:
            std::cout << "[root] " << node->GetName() << "\n";
            break;
 
        case NodeType::Frame: {
            const FrameInfo *frame = node->GetFrame();
            std::cout << "[frame] " << node->GetName();
 
            if (frame != nullptr) {
                std::cout << " id=0x" << std::hex << frame->canId << std::dec
                          << " ext=" << (frame->isExtended ? "yes" : "no")
                          << " dlc=" << static_cast<unsigned int>(frame->dlc);
 
                if (frame->hasPgn)
                    std::cout << " pgn=" << frame->pgn;
            }
 
            std::cout << "\n";
            break;
        }
 
        case NodeType::Signal: {
            const SignalInfo *signal = node->GetSignal();
            std::cout << "[signal] " << node->GetName();
 
            if (signal != nullptr) {
                std::cout << " start=" << signal->startBit
                          << " len=" << signal->length
                          << " unit=" << signal->unit;
            }
 
            std::cout << "\n";
            break;
        }
 
        default:
            std::cout << "[unknown]\n";
            break;
    }
 
    for (std::size_t i = 0U; i < node->GetChildCount(); ++i)
        PrintTree(node->GetChild(i), indent + 1);
}
 
static void PrintDecodedFrame(const DecodedFrameValue &decoded) {
    if (!decoded.valid || (decoded.definition == nullptr)) {
        std::cout << "No frame definition found.\n";
        return;
    }
 
    std::cout << "Decoded frame: " << decoded.definition->name << "\n";
 
    for (const DecodedSignalValue &signal : decoded.signals) {
 
        if ((signal.definition == nullptr) || !signal.valid)
            continue;
 
        std::cout << "  " << signal.definition->name
                  << " raw=";
        if (const std::int64_t *signedValue = std::get_if<std::int64_t>(&signal.rawValue))
            std::cout << *signedValue;
        else
            std::cout << std::get<std::uint64_t>(signal.rawValue);
        std::cout << " physical=" << signal.physicalValue
                  << " " << signal.definition->unit
                  << "\n";
    }
}
 
int main(int argc, char *argv[]) {
    if (argc < 2) {
        std::cerr << "Usage: dbc_demo <file.dbc>\n";
        return 1;
    }
 
    try {
        DbcParser parser;
        DbcDatabase database = parser.ParseFile(argv[1]);
 
        DbcTreeBuilder treeBuilder;
        std::unique_ptr<TreeNode> root = treeBuilder.Build(database);
 
        std::cout << "=== Parsed tree ===\n";
        PrintTree(root.get(), 0);
 
        DbcDecodeBuilder decodeBuilder;
        DecodeDatabase decodeDatabase = decodeBuilder.Build(database);
 
        /*
     * Example raw frame.
     * Replace with live CAN frame or trace record later.
     */
        RawCanFrame rawFrame;
        rawFrame.canId = decodeDatabase.frames.empty() ? 0U : decodeDatabase.frames[0].canId;
        rawFrame.isExtended = decodeDatabase.frames.empty() ? false : decodeDatabase.frames[0].isExtended;
        rawFrame.data.resize(8U, 0U);
 
        DbcDecoder decoder;
        DecodedFrameValue decoded = decoder.Decode(decodeDatabase, rawFrame);
 
        std::cout << "\n=== Decoded frame ===\n";
        PrintDecodedFrame(decoded);
    } catch (const std::exception &ex) {
        std::cerr << "Error: " << ex.what() << "\n";
        return 2;
    }
 
    return 0;
}