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Refactored conditional compilation to enable Emscripten-specific behavior in the communication module. Updated CMakeLists.txt to handle Emscripten build settings and refactored EmscriptenCommunication to properly manage progress handling and command-line arguments.

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This commit adds support for handling slice info callbacks through Emscripten, alongside progress callbacks. Additionally, functions to create slice info messages using rapidjson were implemented to prepare JSON data for slice information.

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Replaced raw pointers with `std::shared_ptr` for better memory management. Standardized variable names to follow consistent naming conventions, improving code readability and maintainability.

This was needed because the reference to Slice was otherwise out-of-scope when calling `Emscripten::sliceNext()`

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Replaced unique_ptr with shared_ptr in various components to facilitate shared ownership of resources and prevent manual memory management. This change affects communication objects, `Slice` instances, and related test cases to ensure smooth integration.

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… into NP-327_emscripten_communication

Added detailed documentation comments for the EmscriptenCommunication class, including descriptions for member variables and methods. This improves code readability and ease of maintenance.

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… into NP-327_emscripten_communication

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The return type of getTotalExtraLayer function on Raft is casted to the value_type to prevent underflow. This previously resulted in method xl to generate invalid gcode.

NP-351

NP-351

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…roduces-unexpected-results' into NP-327_emscripten_communication

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Renamed `gcode_prefix_handler_` to `gcode_header_handler_` for clarity. Updated corresponding usage in `EmscriptenCommunication.h`, `CommandLine.cpp`, and `EmscriptenCommunication.cpp`.

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Ensure the prefix argument is correctly formatted as a string in JavaScript function calls. This change prevents potential issues with GCode prefix handling in the communication module as it starts with ';'

NP-327

NP-327

…r/CuraEngine into NP-327_emscripten_communication

Implemented a `convertTobase64` function to encode strings to base64, ensuring they can be safely transmitted in JavaScript. Updated `EmscriptenCommunication::sendGCodePrefix` to use this new encoding method and modified relevant tests accordingly to check this functionality.

NP-327

NP-327

Co-authored-by: Erwan MATHIEU <[email protected]>

assuming that cloud slicer does not create multiple mesh groups, but one.

NP-351