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https://github.com/cogu/autosar

A set of python modules for working with AUTOSAR XML files
https://github.com/cogu/autosar

arxml autosar autosar-classic

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A set of python modules for working with AUTOSAR XML files

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README 

        
![Python package](https://github.com/cogu/autosar/actions/workflows/python-package.yml/badge.svg)



# Python AUTOSAR v0.5



A set of Python modules for working with [AUTOSAR](https://www.autosar.org/) XML files.



The primary use case is to enable Python to generate ARXML files for import in other (commercial) AUTOSAR toolchains.

It also has some support for parsing AUTOSAR XML files.



**Important notes:**



1. Python AUTOSAR v0.5+ uses a new API and is incompatible with earlier versions.

2. For Python AUTOSAR v0.4, see the [v0.4 maintenance branch](https://github.com/cogu/autosar/tree/maintenance/0.4).

3. Currently, only the categories mentioned below are supported. If you want a full API, wait for v0.6.0:

    * Data Types

    * Constants



## Major design changes



AUTOSAR v0.5 has been rewritten and modernized.



**Key features:**



* New class hierachy

  * Follows the structure of the AUTOSAR XML schema where possible.

* Snake-case naming of variables and methods (Follow PEP8 standard).

* Modern type hinting (this unfortunately requires Python 3.10 or later).

* Python Enum classes for enumeration types.

* Improved XML reading and writing with lxml.

* Linting support

  * Source code is checked with both Pylint and flake8.

* New unit test suite

  * More comprehensive unit tests for every element.

  * Much faster to run as it uses the new XML reader and writer.



## Supported AUTOSAR versions



The implementation tries to follow release R22-11. However, the generated ARXML validates against all versions listed below.

When saving, use the `schema_version` parameter to select desired version (integer with value 48-51).



* 48 (R19-11, Classic AUTOSAR 4.5)

* 49 (R20-11, Classic AUTOSAR 4.6)

* 50 (R21-11, Classic AUTOSAR 4.7)

* 51 (R22-11, Classic AUTOSAR 4.8)



Only Clasic AUTOSAR will be supported.



## Supported XML elements



For currently supported XML elements, see the [CHANGELOG](CHANGELOG.md) file.



## Requirements



* Python 3.10+

* lxml

* [cfile](https://github.com/cogu/cfile) v0.3.1+



## Installation



Manual install required as this version is not available on PyPI (until v0.6).



1. Make sure you have the latest version of `pip` and `setuptools` installed.

2. Download source or clone this repo.

3. Download source or clone the cfile repo (instruction below).

4. Install locally using one of the below methods.



### Preparation



Run in either venv or local.



```bash

python -m pip install --upgrade pip

python -m pip install --upgrade setuptools

git clone https://github.com/cogu/cfile.git cfile_0.3

cd cfile_0.3

git checkout v0.3.1

cd ..

python -m pip install cfile_0.3

```



You can delete the directory `cfile_0.3` after preparation step.



### Standard install



```bash

pip install  .

```



### Editable install (Development mode)



```bash

python -m venv .venv

# Activate your venv environment

pip install --editable .

pip install flake8

```



## Usage



Below is a short introduction. A more comprehensive documentation for v0.5 will be written later.



### Workspace



Create a new workspace object.



```python

import autosar.xml



workspace = autosar.xml.Workspace()

```



### Creating packages



Packages are created using the `make_packages` method. It can recursively create packages as if they are directories.



If you give it a single argument it will return the package created. If you give it multiple arguments it will return a list of packages created.



```python

import autosar.xml



workspace = autosar.xml.Workspace()

packages = workspace.make_packages("DataTypes/BaseTypes",

                                   "DataTypes/ImplementationDataTypes")

print(packages[0].name)

print(packages[1].name)

```



Output



```text

BaseTypes

ImplementationDataTypes

```



Using the builtin `zip`-method you can easily convert the returned list to a dictionary.



```python

import autosar.xml



workspace = autosar.xml.Workspace()

packages = dict(zip(["BaseTypes", "ImplementationDataTypes"],

                    workspace.make_packages("DataTypes/BaseTypes",

                                            "DataTypes/ImplementationDataTypes")))

print(packages["BaseTypes"].name)

print(packages["ImplementationDataTypes"].name)

```



Output



```text

BaseTypes

ImplementationDataTypes

```



### Saving XML documents



Use the Writer class to save XML documents.



```python

import os

from autosar.xml import Document, Writer

import autosar.xml.element as ar_element



# Create new document object with an empty package

document = Document()

package = ar_element.Package("MyPackage")

document.append(package)

# Create a new file "document.arxml" in directory "data"

base_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "data"))

writer = Writer()

writer.write_file(document, os.path.join(base_path, "document.arxml"))

```



If you want to avoid creating the Document object(s) manually, the Workspace class offers several convenience methods related to saving XML.



```python

import os

from autosar.xml import Workspace



workspace = Workspace()

# Create three packages in workspace

workspace.make_packages("DataTypes", "PortInterfaces", "ComponentTypes")

# Save each package to a separate file inside the "data" directory

base_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "data"))

workspace.create_document(os.path.join(base_path, "datatypes.arxml"),

                          packages="/DataTypes")

workspace.create_document(os.path.join(base_path, "port_interfaces.arxml"),

                          packages="/PortInterfaces")

workspace.create_document(os.path.join(base_path, "component_types.arxml"),

                          packages="/ComponentTypes")

workspace.write_documents()

```



### Creating elements



The module `autosar.xml.element` contains all supported elements that you can add to a package. Just call the constructor for an object you want to create and then append it to a package.



Some classes, such as `Computation` has static helper methods starting with `make_`. They act like factory-methods for commonly used creation-patterns and returns a constructed object.



Here's an example where we create both a base type and a simple implementation data type. Newly created elements must be added to a package before they can be referenced by other elements.



```python

import autosar.xml

import autosar.xml.element as ar_element



workspace = autosar.xml.Workspace()

packages = dict(zip(["BaseTypes", "ImplementationDataTypes"],

                    workspace.make_packages("DataTypes/BaseTypes",

                                            "DataTypes/ImplementationDataTypes")))



#Create new base type

uint8_base_type = ar_element.SwBaseType("uint8")

# Taking a reference before the element is added to a package returns None

print(uint8_base_type.ref())

# Add base type to package

packages["BaseTypes"].append(uint8_base_type)

# Taking a reference after the element is added to package returns a SwBaseTypeRef object

print(uint8_base_type.ref()) # SwBaseTypeRef has built-in string conversion



# Create new implementation data type

sw_data_def_props = ar_element.SwDataDefPropsConditional(base_type_ref=uint8_base_type.ref())

inactive_active_t = ar_element.ImplementationDataType("InactiveActive_T",

                                                      category="VALUE",

                                                      sw_data_def_props=sw_data_def_props)

# Add implementation data type to package

packages["ImplementationDataTypes"].append(inactive_active_t)

# Find newly added element by its reference

element = workspace.find("/DataTypes/ImplementationDataTypes/InactiveActive_T")

print(f"{element.name}: {str(type(element))}")

```



Output



```text

None

/DataTypes/BaseTypes/uint8

InactiveActive_T: 

```



Here's a more fleshed out example, tt adds a `TEXTTABLE` CompuMethod and saves everything to an ARXML file. It also demonstrates how you control the XML schema version

when saving the file.



```python

import os

import autosar.xml

import autosar.xml.element as ar_element



workspace = autosar.xml.Workspace()

packages = dict(zip(["BaseTypes", "ImplementationDataTypes", "CompuMethods"],

                    workspace.make_packages("DataTypes/BaseTypes",

                                            "DataTypes/ImplementationDataTypes",

                                            "DataTypes/CompuMethods")))

uint8_base_type = ar_element.SwBaseType("uint8")

packages["BaseTypes"].append(uint8_base_type)



# Create CompuMethod

computation = ar_element.Computation.make_value_table(["Inactive",

                                                       "Active",

                                                       "Error",

                                                       "NotAvailable"])

compu_method = ar_element.CompuMethod(name='InactiveActive_T',

                                      int_to_phys=computation,

                                      category="TEXTTABLE")

#Add new CompuMethod to CompuMethods package

packages["CompuMethods"].append(compu_method)

# Create ImplementantationDataType, referencing the CompuMethod from different package

sw_data_def_props = ar_element.SwDataDefPropsConditional(base_type_ref=uint8_base_type.ref(),

                                                         compu_method_ref=compu_method.ref())

inactive_active_t = ar_element.ImplementationDataType("InactiveActive_T",

                                                      category="VALUE",

                                                      sw_data_def_props=sw_data_def_props)

packages["ImplementationDataTypes"].append(inactive_active_t)

# Save DataType package and all its sub-packages into data/datatypes.arxml

# Before saving documents, set schema-version to 48 (R19-11) (Default is 51 or R22-11)

base_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "data"))

workspace.create_document(os.path.join(base_path, "datatypes.arxml"), packages="/DataTypes")

workspace.write_documents(scehema_version=48)

```



### Reading XML files



Use the Reader class to read ARXML from files or strings. The read-methods produce `Document` objects.



```python

import os

from autosar.xml import Reader



# Read document from file "data/datatypes.arxml"

base_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "data"))

file_path = os.path.join(base_path, "datatypes.arxml")

reader = Reader()

document = reader.read_file(file_path)

# Find element by reference and then print name and type

data_type = document.find("/DataTypes/ImplementationDataTypes/InactiveActive_T")

print(f"{data_type.name}: {str(type(data_type))}")

```



Output



```text

InactiveActive_T: 

```



### RTE generator



RTE generation is in prototype stage and can't do very much at this point.

Here's a simple example how to generate the `Rte_Type.h` header file containing a single type definition.



It uses the latest version of [cfile](https://github.com/cogu/cfile) which has been completely rewritten to better handle complex code generation scenarios.



```python

import os

import autosar.xml

import autosar.xml.element as ar_element

from autosar.generator import TypeGenerator

from autosar.model import ImplementationModel



workspace = autosar.xml.Workspace()

packages = dict(zip(["BaseTypes", "ImplementationDataTypes"],

                    workspace.make_packages("DataTypes/BaseTypes",

                                            "DataTypes/ImplementationDataTypes")))

uint8_base_type = ar_element.SwBaseType("uint8")

packages["BaseTypes"].append(uint8_base_type)

sw_data_def_props = ar_element.SwDataDefPropsConditional(base_type_ref=uint8_base_type.ref())

inactive_active_t = ar_element.ImplementationDataType("InactiveActive_T",

                                                      category="VALUE",

                                                      sw_data_def_props=sw_data_def_props)

packages["ImplementationDataTypes"].append(inactive_active_t)

# Create ImplementationModel from XML workspace

implementation = ImplementationModel(workspace)

# Create data-type instance inside ImplementationModel

implementation.create_from_element(inactive_active_t)

# Generate RTE Types header in "data" folder

type_generator = TypeGenerator(implementation)

base_path = os.path.abspath(os.path.join(os.path.dirname(__file__), "data"))

type_generator.write_type_header(base_path)

```



Content of Rte_Type.h



```c

#ifndef RTE_TYPE_H_

#define RTE_TYPE_H_



#ifndef __cplusplus

extern "C"

{

#endif



/***********************************

*             INCLUDES             *

************************************/

#include "Rte.h"



/***********************************

*     CONSTANTS AND DATA TYPES     *

************************************/



typedef uint8 InactiveActive_T;



#ifndef __cplusplus

}

#endif // __cplusplus

#endif // RTE_TYPE_H_

```



## Python Module Hierachy



### autosar.xml



Packages for handling AUTOSAR XML (ARXML).



### autosar.model



Implementation model, an intermediate model between XML and RTE generation.



### autosar.generator



RTE generators. Right now it only has a generator for the RTE type header.

This part is in early stages of development and is probably not very useful.



## Development Roadmap



Below is a rough roadmap of planned releases.



**v0.5.0:** Data types



**v0.5.1:** Value specifications and constants



**v0.5.2:** Port interfaces



**v0.5.3:** Components and ports



**v0.5.4:** Component (internal) behavior



(There will probably be some intermediate versions here since behavior is a huge area.)



**v0.5.?:** System description



**v0.6.0:** First stable release. Publish to PyPI.