Repository: smaxtec/adis (language: python)

Issue:
initial commit (SX2-1436)
Initial pull request with basic ADIS parser


Discussion / hints:

Fix patch:
diff --git a/LICENSE b/LICENSE
index f288702..0a04128 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,674 +1,165 @@
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+                   GNU LESSER GENERAL PUBLIC LICENSE
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diff --git a/README.md b/README.md
index 182ec8a..4e08d38 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,195 @@
-# ADIS-ADED-Parser
-A Parser for Agricultural Data Interchange Syntax
+# ADIS
+A python package for parsing and creating ADIS (Agricultural Data Interchange Syntax) files. 
+
+This parser supports **Class A** ADIS format.
+
+[ADIS Standardization document](https://www.iso.org/obp/ui/#iso:std:iso:11787:ed-1:v1:en)
+
+[Wikipedia artice (unfortunately only available in german)](https://de.wikipedia.org/wiki/Agricultural_Data_Interchange_Syntax)
+
+## Installation
+```
+pip install adis
+```
+
+## Examples
+### Parse an ADIS file and turn it to JSON
+```python
+# example_adis_to_json.py
+from adis import Adis
+
+adis = Adis.parse_from_file("sample.ads")
+generated_json = adis.to_json()
+
+print(generated_json)
+```
+Prettyprinted output:
+```json
+[
+    {
+        "990001": {
+            "definitions": [
+                {
+                    "item_number": "00000000",
+                    "field_size": 20,
+                    "decimal_digits": 0
+                },
+                {
+                    "item_number": "00000001",
+                    "field_size": 9,
+                    "decimal_digits": 6
+                },
+                {
+                    "item_number": "00000002",
+                    "field_size": 10,
+                    "decimal_digits": 0
+                }
+            ],
+            "data": [
+                {
+                    "00000000": "Euler number        ",
+                    "00000001": 2.718281,
+                    "00000002": null
+                },
+                {
+                    "00000000": "Pi                  ",
+                    "00000001": 3.141592,
+                    "00000002": null
+                },
+                {
+                    "00000000": "Gravity on Earth    ",
+                    "00000001": 9.81,
+                    "00000002": "ms^(-2)   "
+                }
+            ],
+            "status": "H"
+        },
+        "990002": {
+            "definitions": [
+                {
+                    "item_number": "00000008",
+                    "field_size": 10,
+                    "decimal_digits": 0
+                },
+                {
+                    "item_number": "00000009",
+                    "field_size": 10,
+                    "decimal_digits": 0
+                }
+            ],
+            "data": [
+                {
+                    "00000008": "abc       ",
+                    "00000009": "xyz       "
+                },
+                {
+                    "00000008": "def       ",
+                    "00000009": "uvw       "
+                }
+            ],
+            "status": "N"
+        }
+    },
+    {
+        "990001": {
+            "definitions": [
+                {
+                    "item_number": "00000006",
+                    "field_size": 10,
+                    "decimal_digits": 0
+                },
+                {
+                    "item_number": "00000007",
+                    "field_size": 5,
+                    "decimal_digits": 2
+                }
+            ],
+            "data": [
+                {
+                    "00000006": "         1",
+                    "00000007": 1.23
+                },
+                {
+                    "00000006": "         2"
+                }
+            ],
+            "status": "H"
+        }
+    }
+]
+```
+
+
+### Turn a JSON file to ADIS
+```python
+# example_json_to_adis.py
+from adis import Adis
+
+adis = Adis.from_json_file("sample.json")
+generated_adis_text = adis.dumps()
+
+print(generated_adis_text)
+```
+Output:
+```
+DH990001000000002000000000109600000002100
+VH990001Euler number          2718281??????????
+VH990001Pi                    3141592??????????
+VH990001Gravity on Earth      9810000ms^(-2)   
+DN9900020000000810000000009100
+VN990002abc       xyz       
+VN990002def       uvw       
+EN
+DH9900010000000610000000007052
+VH990001         1  123
+VH990001         2|||||
+ZN
+
+```
+
+## About the ADIS format
+Each physical file can contain multiple logical ADIS files, these are represented by objects of the type `AdisFile`.
+Each of those logical ADIS files contains one or multiple blocks, these are represented by objects of the type `AdisBlock`.
+Each block consists of the definitions for the fields (list of objects of type `AdisFieldDefinition`) and one or multiple
+data rows (list of list of `AdisValue`).
+
+## Documentation
+This documentation only contains methods that are inteded to be used by the user.
+Take a look at the docstrings for more information about methods.
+
+### Adis
+Static methods:
+* `parse(text)`: Creates an `Adis` object from a text that's in the ADIS format
+* `parse_from_file(path_to_file)`: Creates an `Adis` object from an ADIS file
+* `from_json(json_text)`: Create an `Adis` object from a json text
+* `from_json_file(path_to_json_file)`: Create an `Adis` object from a json file
+
+Normal methods:
+* `__init__(blocks)`: Creates an `Adis` object from a list of `AdisFile`s
+* `to_json()`: Creates a json text containing the files, definitions and data
+* `dumps()`: Creates a text in the ADIS format
+* `get_files()`: Returns a list of `AdisFile`s
+
+### AdisFile
+Normal methods:
+* `__init__(blocks)`: Creates an `AdisFile` from a list of `AdisBlock`s
+* `get_blocks()`: Returns a list of `AdisBlock`s
+
+### AdisBlock
+Normal methods:
+* `__init__(entity_number, status, field_definitions, data_rows)`: Creates an `AdisBlock`
+* `get_entity_number()`: Returns the entity number of this `AdisBlock`
+* `get_field_definitions()`: Returns the field definitions as list of `AdisFieldDefinition`s
+* `get_data_rows()`: Returns the data rows as list. Each data row is a list of `AdisValue`s
+
+### AdisFieldDefinition
+Normal methods:
+* `__init__(item_number, field_size, decimal_digits)`: Creates an `AdisFieldDefinition`
+* `get_item_number()`: Returns the item number
+* `get_field_size()`: Returns the field size
+* `get_decimal_digits()`: Returns the number of decimal digits
+
+### AdisValue
+Normal methods:
+* `__init__(item_number, value)`: Creates an `AdisValue`
+* `to_dict()`: Returns a dict containing the item number and value of this `AdisValue`
diff --git a/adis/__init__.py b/adis/__init__.py
new file mode 100644
index 0000000..a21f41b
--- /dev/null
+++ b/adis/__init__.py
@@ -0,0 +1,5 @@
+from .adis import Adis
+from .adis_file import AdisFile
+from .adis_block import AdisBlock
+from .adis_field_definition import AdisFieldDefinition
+from .adis_value import AdisValue
diff --git a/adis/adis.py b/adis/adis.py
new file mode 100644
index 0000000..23744be
--- /dev/null
+++ b/adis/adis.py
@@ -0,0 +1,160 @@
+import json
+from .adis_file import AdisFile
+from .adis_lines import (
+    AdisLine,
+    EndOfLogicalFileLine,
+    PhysicalEndOfFileLine
+)
+
+def split_lines(raw_input_text):
+    """Splits the provided text into lines. Lines are splitted at "\n" and "\r" chars get \
+        removed as well.
+
+    Args:
+        raw_input_text (string): ADIS text
+
+    Returns:
+        list: lines of the provided ADIS text
+    """
+    # lines have to end with "\r\n" but we also accept lines that only end with "\n"
+    lines = []
+    for raw_line in raw_input_text.split("\n"):
+        lines.append(raw_line.replace("\r", ""))    # remove \r
+    return lines
+
+
+class Adis:
+    def __init__(self, adis_files):
+        """Creates an Adis object based on the logical ADIS files
+
+        Args:
+            adis_files (list[AdisFile]): List of logical ADIS files
+        """
+        self.files = adis_files
+
+    def get_files(self):
+        """Returns a list containing the logical AdisFiles
+
+        Returns:
+            list[AdisFile]: list containing the logical AdisFiles
+        """
+        return self.files
+
+    @staticmethod
+    def parse(text):
+        """This method parses the provided ADIS text into an Adis object.
+
+        Args:
+            text (string): ADIS file content
+
+        Returns:
+            Adis: Adis object created from the provided ADIS text
+        """
+        raw_lines = split_lines(text)
+
+        adis_files = []
+
+        lines_for_file = []
+        for raw_line in raw_lines:
+            if raw_line == "":
+                continue
+            
+            line = AdisLine.parse_line(raw_line)
+            if type(line) == EndOfLogicalFileLine or type(line) == PhysicalEndOfFileLine:
+                adis_files.append(AdisFile.from_lines(lines_for_file))
+                lines_for_file = []
+            else:
+                lines_for_file.append(line)
+
+        return Adis(adis_files)
+
+    @staticmethod
+    def parse_from_file(path_to_file):
+        """This method parses the given ADIS file to an Adis object.
+
+        Args:
+            path_to_file (string): Path to the ADIS file
+
+        Returns:
+            Adis: Adis object created from the provided ADIS file
+        """
+        with open(path_to_file, "r") as input_file:
+            text = input_file.read()
+        return Adis.parse(text)
+
+    def get_list(self):
+        """Returns a list containing of the logical ADIS files and their contents. \
+            The returned list only contains builtin types.
+
+        Returns:
+            list: containing the logical adis files and their contents as builtin types.
+        """
+        list_of_files = []
+        for adis_file in self.files:
+            list_of_files.append(adis_file.to_dict())
+        return list_of_files
+
+    def to_json(self):
+        """Creates a json from the Adis object.
+
+        Returns:
+            string: Adis as json
+        """
+        return json.dumps(self.get_list())
+
+    @staticmethod
+    def from_json(json_text):
+        """Creates an Adis object based on the provided json.
+
+        Args:
+            json_text (string): json text. Note that the json has to have a specific structure. \
+                Take a look at the README for more information.
+
+        Returns:
+            Adis: Adis object
+        """
+        data = json.loads(json_text)
+        if type(data) is not list:
+            raise Exception("""The root element of the JSON has to be a list. Got %s."""
+                            % type(data))
+        adis_files = []
+        for file_dict in data:
+            if type(file_dict) is not dict:
+                raise Exception("Expecting a dict but got %s." % type(file_dict))
+            adis_files.append(AdisFile.from_dict(file_dict))
+
+        return Adis(adis_files)
+
+    @staticmethod
+    def from_json_file(path_to_json_file):
+        """Creates an Adis object based on the provided json file.
+
+        Args:
+            path_to_json_file (string): Path to the json file. Note that the json has to have a \
+                specific structure. Take a look at the README for more information.
+
+        Returns:
+            Adis: Adis object
+        """
+        with open(path_to_json_file) as input_file:
+            raw_content = input_file.read()
+        return Adis.from_json(raw_content)
+
+    def dumps(self):
+        """Creates an ADIS text
+
+        Returns:
+            string: ADIS text
+        """
+        file_texts = []
+        for adis_file in self.files:
+            file_texts.append(adis_file.dumps())
+        
+        end_of_logical_file_line = "EN\r\n"
+        text = end_of_logical_file_line.join(file_texts)
+
+        text += "ZN\r\n"    # physical end of file
+        return text
+
+    def __repr__(self):
+        return """Adis containing %d Adis-files""" % len(self.files)
diff --git a/adis/adis_block.py b/adis/adis_block.py
new file mode 100644
index 0000000..2941278
--- /dev/null
+++ b/adis/adis_block.py
@@ -0,0 +1,221 @@
+from .adis_field_definition import AdisFieldDefinition
+from .adis_lines import (
+    AdisLine,
+    DefinitionLine,
+    ValueLine
+)
+from .adis_value import AdisValue
+
+"""
+An AdisBlock consists of one definition and (one or) multiple data rows.
+Each data row has multiple fields.
+"""
+
+class AdisBlock:
+    def __init__(self, entity_number, status, field_definitions, data_rows):
+        """Creates an AdisBlock object.
+
+        Args:
+            entity_number (string): Entity number of this Block (has to be a string with 6 chars)
+            status (string): Status char of this block, can be H, N, S, F or D
+            field_definintions (list[AdisFieldDefinition]): Field definitions
+            data_rows (list[list[AdisValue]]): list of data rows, each data row is a list \
+                containing AdisValue
+        """
+        if len(status) != 1:
+            raise Exception("Status may only be one char.")
+        if status not in AdisLine.status_chars:
+            raise Exception("Invalid status char. Has to be one of %s."
+                % AdisLine.status_chars)
+        if type(entity_number) is not str or len(entity_number) != 6:
+            raise Exception("""The entity number has to be a string consisting of 6 chars.
+                Got \"%s\".""" % entity_number)
+        self.status = status
+        self.entity_number = entity_number
+        self.field_definitions = field_definitions
+        self.data_rows = data_rows
+
+    def get_entity_number(self):
+        """Returns the entity number of this block.
+
+        Returns:
+            string: Entity number of this block (is a string of 6 chars)
+        """
+        return self.entity_number
+
+    def get_field_definitions(self):
+        """Returns the field definitions of this block.
+
+        Returns:
+            list[AdisFieldDefinition]: list containing field definitions
+        """
+        return self.field_definitions
+    
+    def get_data_rows(self):
+        """Returns the data rows of this block.
+
+        Returns:
+            list[list[AdisValue]]: list of data rows. Each row is a list of AdisValues
+        """
+        return self.data_rows
+
+    @staticmethod
+    def from_lines(lines):
+        """Creates an AdisBlock from a list of AdisLines
+
+        Args:
+            lines (list[AdisLine]): list of AdisLines
+        
+        Returns:
+            AdisBlock: new AdisBlock
+        """
+        status = None
+        entity_number = None
+        field_definitions = None
+        data_rows = []
+        for line in lines:
+            if type(line) == DefinitionLine:
+                status = line.get_status_char()
+                entity_number = line.get_entity_number()
+                field_definitions = line.get_field_definitions()
+            if type(line) == ValueLine:
+                if field_definitions is None:
+                    raise Exception("Definition line is missing before value line")
+                data_rows.append(line.parse(field_definitions))
+
+        if entity_number is None or field_definitions is None:
+            raise Exception("Definition is missing.")
+
+        return AdisBlock(entity_number, status, field_definitions, data_rows)
+
+    @staticmethod
+    def from_dict(entity_number, block_dict):
+        """Creates an AdisBlock form a dict.
+
+        Args:
+            entity_number (string): Entity number of the block
+            block_dict (dict): containing the data rows, the field definitions and the status
+
+        Returns:
+            AdisBlock: new AdisBlock
+        """
+        if "status" not in block_dict:
+            raise Exception("\"status\" field is missing in block dict.")
+        if "definitions" not in block_dict:
+            raise Exception("\"definitions\" field is missing in block dict.")
+        if "data" not in block_dict:
+            raise Exception("\"data\" field is missing in block dict.")
+
+        status = block_dict["status"]
+        field_definitions = []
+        for definition_dict in block_dict["definitions"]:
+            if type(definition_dict) is not dict:
+                raise Exception("A field definition has to be a dict but got %s."
+                                % type(definition_dict))
+            definition = AdisFieldDefinition.from_dict(definition_dict)
+            field_definitions.append(definition)
+
+        if type(block_dict["data"]) is not list:
+            raise Exception("The data of each block has to be a list. Got %s."
+                            % type(block_dict["data"]))
+        
+        data_rows = []
+        for data_row_dict in block_dict["data"]:
+            if type(data_row_dict) is not dict:
+                raise Exception("Each data row has to be a dict. Got %s."
+                                % type(data_row_dict))
+            data_row = []
+            for definition in field_definitions:
+                item_number = definition.get_item_number()
+                if item_number in data_row_dict:
+                    value = data_row_dict[item_number]
+                    adis_value = AdisValue(item_number, value)
+                    data_row.append(adis_value)
+
+            data_rows.append(data_row)
+
+        return AdisBlock(entity_number, status, field_definitions, data_rows)
+
+    def to_dict(self):
+        """Creates a dict cointaining all data of this block
+
+        Returns:
+            dict: contains the field definitions, the data rows and the status of the block
+        """
+        result_dict = {
+            "definitions": [],
+            "data": [],
+            "status": self.status
+        }
+        for definition in self.field_definitions:
+            result_dict["definitions"].append(definition.to_dict())
+
+        for data_row in self.data_rows:
+            result_dict["data"].append(self.data_row_to_dict(data_row))
+
+        return result_dict
+
+    def data_row_to_dict(self, data_row):
+        """Turns a data row to a dict.
+
+        Args:
+            data_row (list[AdisValue]): list containing the values of the data row
+
+        Returns:
+            dict: dict where the key is the item number and the value is the actual value of the \
+                field
+        """
+        data_row_dict = {}
+        for value in data_row:
+            value_as_dict = value.to_dict()
+            data_row_dict[value_as_dict["item_number"]] = value_as_dict["value"]
+        return data_row_dict
+
+    def dumps_definitions(self):
+        """Creats a ADIS definition line string from the field definitions.
+
+        Returns:
+            string: ADIS definition line string
+        """
+        text = "D" + self.status + self.entity_number
+        for definition in self.field_definitions:
+            text += definition.dumps()
+        text += "\r\n"
+        return text
+
+    def dumps_data(self):
+        """Turns the data rows into value lines.
+
+        Returns:
+            string: value lines
+        """
+        text = ""
+        for data_row in self.data_rows:
+            # create a value line
+            text += "V" + self.status + self.entity_number
+            data_row_dict = self.data_row_to_dict(data_row)
+            for definition in self.field_definitions:
+                item_number = definition.get_item_number()
+                if item_number not in data_row_dict:
+                    # the value of this field is undefined
+                    text += definition.dumps_value(None, undefined=True)
+                else:
+                    value = data_row_dict[item_number]
+                    text += definition.dumps_value(value)
+            
+            text += "\r\n"
+        return text
+
+    def dumps(self):
+        """Creates an ADIS text form this block.
+
+        Returns:
+            string: ADIS text of this block
+        """
+        text = self.dumps_definitions()
+        text += self.dumps_data()
+        return text
+
+    def __repr__(self):
+        return "AdisBlock with status=%s and entity_number=%s containing %d data row(s)" \
+                % (self.status, self.entity_number, len(self.data_rows))
diff --git a/adis/adis_field_definition.py b/adis/adis_field_definition.py
new file mode 100644
index 0000000..e574046
--- /dev/null
+++ b/adis/adis_field_definition.py
@@ -0,0 +1,210 @@
+from .adis_value import AdisValue
+
+"""
+The AdisFieldDefinition holds information about the size and the decimal places of the data fields.
+"""
+class AdisFieldDefinition:
+    def __init__(self, item_number, field_size, decimal_digits):
+        """Creates an AdisFieldDefinition.
+
+        Args:
+            item_number (string): item number of the fields
+            field_size (string, int): field size in chars
+            decimal_digits (string, int): number of decimal places (0 when the field does not \
+                hold a text or the number has no decimal places)
+        """
+        if type(item_number) is not str or len(item_number) != 8:
+            raise Exception("The item_number has to be a string with length = 8. Got \"%s\""
+                % item_number)
+        self.item_number = item_number
+        
+        self.field_size = int(field_size)
+        if self.field_size < 1 or 99 < self.field_size:
+            raise Exception("The field size has to be a number between 1 and 99. Got %d."
+                % self.field_size)
+        
+        self.decimal_digits = int(decimal_digits)
+        if self.decimal_digits < 0 or 9 < self.decimal_digits:
+            raise Exception("The number of decimal digits has to be a number between 0 and 9. " \
+                "Got %d." % self.decimal_digits)
+
+    def get_item_number(self):
+        """Returns the item number.
+
+        Returns:
+            string: item number
+        """
+        return self.item_number
+
+    def get_field_size(self):
+        """Returns the field size.
+
+        Returns:
+            int: field size
+        """
+        return self.field_size
+
+    def get_decimal_digits(self):
+        """Returns the number of decimal digits.
+
+        Returns:
+            int: number of decimal digits
+        """
+        return self.decimal_digits
+
+    def parse_field_at_position(self, raw_text, position):
+        """Parses 
+
+        Args:
+            raw_text (string): raw ADIS file line
+            position (int): position where to start to parse the field from
+
+        Returns:
+            AdisValue: AdisValue of the parsed field, or None if the value of the field is \
+                undefined
+        """
+        # return a string when decimal_digits is 0 / otherwise float
+        item_number = self.item_number
+        value = raw_text[position:position + self.field_size]
+
+        value_size = len(value)
+        if value_size != 0 and value_size != self.field_size:
+            raise Exception("Expected field size of %d chars or an empty field, but got " \
+                "field size of %d chars." % (self.field_size, value_size))
+        elif value_size == 0:
+            value = None
+
+        if value is not None and self.only_contains_char(value, "?"):   # null value field
+            value = None
+
+        if value is not None and self.only_contains_char(value, "|"):   # undefined DDI number
+            return None         # no value will be created for this field
+
+        # handle case where it's a decimal number
+        if value is not None and self.decimal_digits != 0:
+            value = float(value)
+            value /= 10**self.decimal_digits
+
+        return AdisValue(item_number, value)
+
+    def only_contains_char(self, text, allowed_char):
+        """Checks if the provided text only contains the provided char.
+
+        Args:
+            text (string): text to check
+            allowed_char (string): char that may be in the text
+
+        Returns:
+            boolean: True if the text only contains the given char, otherwise False
+        """
+        for char in text:
+            if char != allowed_char:
+                return False
+        return True
+
+    def to_dict(self):
+        """Creates a dict that contains all information from this definition.
+
+        Returns:
+            dict: contains the item_number, field_size and decimal_digits
+        """
+        return {
+            "item_number": self.item_number,
+            "field_size": self.field_size,
+            "decimal_digits": self.decimal_digits
+        }
+
+    def dumps(self):
+        """Creates a string from this definition that can directly be a part of the defintion \
+            line in an ADIS file
+
+        Returns:
+            string: definition text
+        """
+        text = self.item_number
+        text += self.number_to_str_with_window_size(self.field_size, 2)
+        text += str(self.decimal_digits)    # only 1 char window
+        return text
+
+    def dumps_value(self, value, undefined=False):
+        """Dumps the provided AdisValue to a string.
+
+        Args:
+            value (AdisValue): value that should be turned to a string
+            undefined (bool, optional): Whether the value is undefined or not. Defaults to False.
+
+        Returns:
+            string: string that holds the given AdisValue in the correct way
+        """
+        if undefined:
+            return self.field_size * "|"
+        if value is None:
+            return self.field_size * "?"
+        elif type(value) is str:
+            if self.field_size < len(value):
+                raise Exception("value \"%s\" is too long for this field." % value)
+            
+            # fill space on the right with " "'s
+            missing_chars_number = self.field_size - len(value)
+            return value + missing_chars_number * " "
+        else:
+            text = str(value)
+            if self.decimal_digits != 0 or type(value) is float:
+                decimal_dot_position = text.find(".") + 1
+                decimal_dot_position_from_behind = len(text) - decimal_dot_position
+                text = text.replace(".", "")
+                
+                expected_decimal_dot_position_from_behind = self.decimal_digits
+
+                if expected_decimal_dot_position_from_behind > decimal_dot_position_from_behind:
+                    decimal_places_to_add = expected_decimal_dot_position_from_behind \
+                                                - decimal_dot_position_from_behind
+                    text += decimal_places_to_add * "0"
+                elif expected_decimal_dot_position_from_behind < decimal_dot_position_from_behind:
+                    decimal_places_to_remove = decimal_dot_position_from_behind \
+                                                - expected_decimal_dot_position_from_behind
+                    text = text[:len(text) - decimal_places_to_remove]
+
+            text_length = len(text)
+            if self.field_size < text_length:
+                raise Exception(f"Number {value} is too large for this field.")
+
+            missing_chars_number = self.field_size - text_length
+            text = " " * missing_chars_number + text
+            return text
+
+    def number_to_str_with_window_size(self, number, window_size):
+        """Creates a string with a specific length from a number. All chars that are not used get \
+            filled up with "0"s
+
+        Args:
+            number (int): number that should be turned to string
+            window_size (int): how long the string should be
+
+        Returns:
+            string: text with specified length that contains the number
+        """
+        result_str = str(number)
+        missing_chars_number = window_size - len(result_str)
+        result_str = missing_chars_number * "0" + result_str
+        return result_str
+
+    @staticmethod
+    def from_dict(definition_dict):
+        """Creates an AdisFieldDefinition from a dict.
+
+        Args:
+            definition_dict (dict): dict containing the item number, the field size and the \
+                decimal digits of field
+
+        Returns:
+            AdisFieldDefinition: new AdisFieldDefinition
+        """
+        item_number = definition_dict["item_number"]
+        field_size = definition_dict["field_size"]
+        decimal_digits = definition_dict["decimal_digits"]
+        return AdisFieldDefinition(item_number, field_size, decimal_digits)
+
+    def __repr__(self):
+        return "AdisFieldDefinition: item_number=%s, field_size=%d, decimal_digits=%d" \
+            % (self.item_number, self.field_size, self.decimal_digits)
diff --git a/adis/adis_file.py b/adis/adis_file.py
new file mode 100644
index 0000000..159fb18
--- /dev/null
+++ b/adis/adis_file.py
@@ -0,0 +1,113 @@
+from .adis_block import AdisBlock
+from .adis_lines import DefinitionLine
+
+"""
+An AdisFile contains multiple AdisBlocks.
+"""
+
+class AdisFile:
+    def __init__(self, blocks):
+        """Creates a new AdisFile
+
+        Args:
+            blocks (list[AdisBlock]): blocks that are located in this file
+        """
+        self.blocks = blocks
+
+    def get_blocks(self):
+        """Returns a list of AdisBlocks that are in this AdisFile
+
+        Returns:
+            list[AdisBlock]: AdisBlocks in this AdisFile
+        """
+        return self.blocks
+
+    @staticmethod
+    def from_lines(lines):
+        """Creates a new AdisFile from the provided lines.
+
+        Args:
+            lines (list[AdisLine]): the AdisFile will be created on base of these lines
+
+        Returns:
+            AdisFile: the new AdisFile
+        """
+        blocks_of_lines = AdisFile.split_lines_into_blocks(lines)
+        blocks = []
+
+        for block_of_lines in blocks_of_lines:
+            blocks.append(AdisBlock.from_lines(block_of_lines))
+
+        return AdisFile(blocks)
+
+    @staticmethod
+    def from_dict(file_dict):
+        """Creates a new AdisFile from the provided dict.
+
+        Args:
+            file_dict (dict): contains information about the contents of this file
+
+        Returns:
+            AdisFile: the new AdisFile
+        """
+        blocks = []
+        for entity_number in file_dict:
+            block_dict = file_dict[entity_number]
+            adis_block = AdisBlock.from_dict(entity_number, block_dict)
+            blocks.append(adis_block)
+        return AdisFile(blocks)
+
+    # Each block starts with a definition
+    @staticmethod
+    def split_lines_into_blocks(lines):
+        """Splits the lines into blocks of lines.
+
+        Args:
+            lines (list[AdisLine]): list of AdisLines of this file
+
+        Returns:
+            list[list[AdisLine]]: list that contains a list of lines for each block in this \
+                AdisFile
+        """
+        blocks = []
+        current_block = []
+
+        for line in lines:
+            if type(line) == DefinitionLine:
+                # start of a new block
+                if len(current_block) != 0:
+                    blocks.append(current_block)
+                current_block = [line]
+            else:
+                current_block.append(line)
+        
+        if len(current_block) != 0:
+            blocks.append(current_block)
+
+        return blocks
+
+    def to_dict(self):
+        """Creates a dict from the AdisFile.
+
+        Returns:
+            dict: contains all data of the blocks in this file
+        """
+        data = {}
+        for block in self.blocks:
+            data[block.get_entity_number()] = block.to_dict()
+        return data
+
+    def dumps(self):
+        """Creates an ADIS text from this AdisFile.
+
+        Returns:
+            string: ADIS text of this AdisFile
+        """
+        text = ""
+        for block in self.blocks:
+            text += block.dumps()
+
+        return text
+
+    def __repr__(self):
+        return "AdisFile contains %d blocks" % len(self.blocks)
diff --git a/adis/adis_lines.py b/adis/adis_lines.py
new file mode 100644
index 0000000..47fc363
--- /dev/null
+++ b/adis/adis_lines.py
@@ -0,0 +1,264 @@
+from .adis_field_definition import AdisFieldDefinition
+
+class AdisLine:
+    status_chars = {
+        "H": "header",
+        "N": "normal",
+        "S": "synchronisation",
+        "F": "faulty",
+        "D": "deletion"
+    }
+
+    # takes the line without the first char
+    def __init__(self, line):
+        """Creates an AdisLine.
+
+        Args:
+            line (string): the raw line from the ADIS file
+        """
+        self.line = line
+        self.line_type_char = line[0]
+        self.status_char = line[1]
+
+        self.status = AdisLine.status_chars[self.status_char]
+
+        if not self.status_allowed(self.status):
+            raise Exception(
+                f"Linetype {self.line_type} may not have status {self.status}")
+
+    def status_allowed(self, status):
+        """Returns whether the given status is allowed for this AdisLine or not.
+
+        Args:
+            status (string): status char
+
+        Returns:
+            boolean: True if this status is allowed for this line, otherwise False
+        """
+        return status in self.allowed_statuses
+
+    def get_type_char(self):
+        """Returns the type char of this AdisLine.
+
+        Returns:
+            string: type char of this AdisLine
+        """
+        return self.line_type_char
+
+    def get_status_char(self):
+        """Returns the status char of this AdisLine.
+
+        Returns:
+            string: status char of this AdisLine
+        """
+        return self.status_char
+
+    def __repr__(self):
+        return "%s status: %s, line: %s" % (self.line_type, self.status, self.line)
+    
+    @staticmethod
+    def parse_line(line):
+        """Creates an AdisLine from the given line.
+
+        Args:
+            line (string): line from the ADIS file
+
+        Returns:
+            AdisLine: new AdisLine
+        """
+        line_types = {
+            "D": DefinitionLine,
+            "V": ValueLine,
+            "E": EndOfLogicalFileLine,
+            "C": CommentLine,
+            "Z": PhysicalEndOfFileLine
+        }
+
+        line_type = line[0]
+        return line_types[line_type](line)
+
+
+class DefinitionLine(AdisLine):
+    def __init__(self, line):
+        """Creates a DefinitionLine
+
+        Args:
+            line (string): line from ADIS file
+        """
+        self.line_type = "Definition"
+        self.allowed_statuses = [
+            "header", "normal", "synchronisation", "faulty", "deletion"
+        ]
+        super().__init__(line)
+
+        self.entity_number = self.line[2:8]
+
+        field_definitions_text = self.line[8:]
+        field_definition_blocks = self.split_field_definitions_text(field_definitions_text)
+
+        self.field_definitions = []
+        for field_definition_block in field_definition_blocks:
+            self.field_definitions.append(self.create_field_definition(field_definition_block))
+
+    def get_entity_number(self):
+        """Returns the entity number.
+
+        Returns:
+            string: entity number if this line
+        """
+        return self.entity_number
+
+    def get_field_definitions(self):
+        """returns the field definitions.
+
+        Returns:
+            list[AdisFieldDefinition]: list of field definitions
+        """
+        return self.field_definitions
+
+    def split_field_definitions_text(self, field_definitions_text):
+        """Splits the part of an ADIS file line that contains the field definitions into parts. \
+            (Each field definition is one part)
+
+        Args:
+            field_definitions_text (string): part of a raw ADIS line that holds the field \
+                definitions
+
+        Returns:
+            list[string]: list that holds the different field definition strings
+        """
+        definition_block_length = 11    # each field definition consists of 11 chars
+        if len(field_definitions_text) % definition_block_length != 0:
+            raise Exception("Length of definitions text is %d but it has to be a multiple of %d"
+                % (len(field_definitions_text), definition_block_length))
+        definition_blocks = []
+        number_of_field_definitions = int(len(field_definitions_text) / definition_block_length)
+        for block_count in range(number_of_field_definitions):
+            start_index = block_count * definition_block_length
+            end_index = start_index + definition_block_length
+            definition_blocks.append(field_definitions_text[start_index:end_index])
+        return definition_blocks
+
+    def create_field_definition(self, field_definition_block):
+        """Creates an AdisFieldDefinition from the raw definition block from the ADIS line.
+
+        Args:
+            field_definition_block (string): part of the raw ADIS line that holds a field \
+                definition
+
+        Returns:
+            AdisFieldDefinition: new AdisFieldDefinition
+        """
+        item_number = field_definition_block[0:8]
+        field_size = field_definition_block[8:10]
+        decimal_digits = field_definition_block[10]
+        return AdisFieldDefinition(item_number, field_size, decimal_digits)
+
+
+class ValueLine(AdisLine):
+    def __init__(self, line):
+        """Creates a ValueLine.
+
+        Args:
+            line (string): raw line from an ADIS file
+        """
+        self.line_type = "Value"
+        self.allowed_statuses = [
+            "header", "normal", "synchronisation", "faulty", "deletion"
+        ]
+        super().__init__(line)
+
+        self.entity_number = self.line[2:8]
+        self.raw_items = self.line[8:]
+
+    def get_entity_number(self):
+        """Returns the entity number.
+
+        Returns:
+            string: entity number if this line
+        """
+        return self.entity_number
+
+    def parse(self, field_definitions):
+        """Parses a list of AdisValues from a raw ADIS file value line using the provided \
+            list of field definitions.
+
+        Args:
+            field_definitions (list[AdisFieldDefinition]): The field definitions for the fields \
+                in this line.
+
+        Returns:
+            list[AdisValue]: AdisValues parsed from this line
+        """
+        expected_raw_items_length = 0
+        for field_definition in field_definitions:
+            expected_raw_items_length += field_definition.get_field_size()
+        
+        if len(self.raw_items) != expected_raw_items_length:
+            expected_raw_items_length_when_last_item_empty = \
+                expected_raw_items_length - field_definitions[-1].get_field_size()
+            if len(self.raw_items) < expected_raw_items_length_when_last_item_empty:
+                raise Exception("Expecting an item text length of %d chars or %d chars, " \
+                    "but got %d chars."
+                    % (expected_raw_items_length, 
+                        expected_raw_items_length_when_last_item_empty,
+                        len(self.raw_items)))
+
+        values = []
+        current_position = 0
+        for field_definition in field_definitions:
+            field_size = field_definition.get_field_size()
+            value = field_definition.parse_field_at_position(self.raw_items, current_position)
+            if value is not None:
+                values.append(value)
+            current_position += field_size
+
+        return values
+
+
+class EndOfLogicalFileLine(AdisLine):
+    def __init__(self, line):
+        """Creates an EndOfLogicalFileLine. Note that each physical ADIS file can contain \
+            multiple logical files.
+
+        Args:
+            line (string): raw line from an ADIS file
+        """
+        self.line_type = "End of logical file"
+        self.allowed_statuses = ["normal"]
+        super().__init__(line)
+
+
+class CommentLine(AdisLine):
+    def __init__(self, line):
+        """Creates a CommentLine
+
+        Args:
+            line (string): raw line from an ADIS file
+        """
+        self.line_type = "Comment"
+        self.allowed_statuses = [
+            "header", "normal", "synchronisation", "faulty", "deletion"
+        ]
+        super().__init__(line)
+        self.comment = self.line[2:]
+    
+    def get_comment(self):
+        """Returns the comment.
+
+        Returns:
+            string: comment
+        """
+        return self.comment
+
+
+class PhysicalEndOfFileLine(AdisLine):
+    def __init__(self, line):
+        """Creates a PhysicalEndOfFileLine.
+
+        Args:
+            line (string): raw line from an ADIS file
+        """
+        self.line_type = "Physical end of file"
+        self.allowed_statuses = ["normal"]
+        super().__init__(line)
diff --git a/adis/adis_value.py b/adis/adis_value.py
new file mode 100644
index 0000000..c400c32
--- /dev/null
+++ b/adis/adis_value.py
@@ -0,0 +1,24 @@
+class AdisValue:
+    def __init__(self, item_number, value):
+        """Creates a AdisValue from the item number and a value of a field.
+
+        Args:
+            item_number (string): item number of the field
+            value (None, string, int, float): value of the field
+        """
+        self.item_number = item_number
+        self.value = value
+
+    def to_dict(self):
+        """Returns the AdisValue as a dict.
+
+        Returns:
+            dict: contains item_number and value
+        """
+        return {
+            "item_number": self.item_number,
+            "value": self.value
+        }
+
+    def __repr__(self):
+        return "AdisValue: item_number=%s, value=%s" % (self.item_number, str(self.value))
diff --git a/example_adis_to_json.py b/example_adis_to_json.py
new file mode 100644
index 0000000..6c53d3c
--- /dev/null
+++ b/example_adis_to_json.py
@@ -0,0 +1,6 @@
+from adis import Adis
+
+adis = Adis.parse_from_file("sample.ads")
+generated_json = adis.to_json()
+
+print(generated_json)
diff --git a/example_json_to_adis.py b/example_json_to_adis.py
new file mode 100644
index 0000000..2379f55
--- /dev/null
+++ b/example_json_to_adis.py
@@ -0,0 +1,6 @@
+from adis import Adis
+
+adis = Adis.from_json_file("sample.json")
+generated_adis_text = adis.dumps()
+
+print(generated_adis_text)
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..b5a3c46
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,6 @@
+[build-system]
+requires = [
+    "setuptools>=42",
+    "wheel"
+]
+build-backend = "setuptools.build_meta"
\ No newline at end of file
diff --git a/sample.ads b/sample.ads
new file mode 100644
index 0000000..667e6f0
--- /dev/null
+++ b/sample.ads
@@ -0,0 +1,12 @@
+DH990001000000002000000000109600000002100
+VH990001Euler number          2718281??????????
+VH990001Pi                    3141592??????????
+VH990001Gravity on Earth      9810000ms^(-2)   
+DN9900020000000810000000009100
+VN990002abc       xyz       
+VN990002def       uvw       
+EN
+DH9900010000000610000000007052
+VH990001         1  123
+VH990001         2|||||
+ZN
diff --git a/sample.json b/sample.json
new file mode 100644
index 0000000..5edf78c
--- /dev/null
+++ b/sample.json
@@ -0,0 +1,92 @@
+[
+    {
+        "990001": {
+            "status": "H",
+            "definitions": [
+                {
+                    "item_number": "00000000",
+                    "field_size": 20,
+                    "decimal_digits": 0
+                },
+                {
+                    "item_number": "00000001",
+                    "field_size": 9,
+                    "decimal_digits": 6
+                },
+                {
+                    "item_number": "00000002",
+                    "field_size": 10,
+                    "decimal_digits": 0
+                }
+            ],
+            "data": [
+                {
+                    "00000000": "Euler number",
+                    "00000001": 2.71828182,
+                    "00000002": null
+                },
+                {
+                    "00000000": "Pi",
+                    "00000001": 3.14159265,
+                    "00000002": null
+                },
+                {
+                    "00000000": "Gravity on Earth",
+                    "00000001": 9.81,
+                    "00000002": "ms^(-2)" 
+                }
+            ]
+        },
+        "990002": {
+            "status": "N",
+            "definitions": [
+                {
+                    "item_number": "00000008",
+                    "field_size": 10,
+                    "decimal_digits": 0
+                },
+                {
+                    "item_number": "00000009",
+                    "field_size": 10,
+                    "decimal_digits": 0
+                }
+            ],
+            "data": [
+                {
+                    "00000009": "xyz",
+                    "00000008": "abc"
+                },
+                {
+                    "00000008": "def",
+                    "00000009": "uvw"
+                }
+            ]
+        }
+    },
+    {
+        "990001": {
+            "status": "H",
+            "definitions": [
+                {
+                    "item_number": "00000006",
+                    "field_size": 10,
+                    "decimal_digits": 0
+                },
+                {
+                    "item_number": "00000007",
+                    "field_size": 5,
+                    "decimal_digits": 2
+                }
+            ],
+            "data": [
+                {
+                    "00000006": 1,
+                    "00000007": 1.23
+                },
+                {
+                    "00000006": 2
+                }
+            ]
+        }
+    }
+]
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..784f641
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,25 @@
+[metadata]
+name = adis
+version = 0.0.1b
+author = smaXtec
+author_email = support@smaxtec.com
+license = LGPLv3
+description = A package for parsing ADIS files or creating new files in the ADIS format.
+long_description = file: README.md
+long_description_content_type = text/markdown
+url = https://github.com/smaxtec/adis
+project_urls =
+    Bug Tracker = https://github.com/smaxtec/adis/issues
+classifiers =
+    Programming Language :: Python :: 3
+    License :: OSI Approved :: LGPL-3.0
+    Operating System :: OS Independent
+
+[options]
+package_dir =
+    = .
+packages = find:
+python_requires = >=3.8
+
+[options.packages.find]
+where = .


Test patch:
diff --git a/test_sample.py b/test_sample.py
new file mode 100644
index 0000000..3e0fe85
--- /dev/null
+++ b/test_sample.py
@@ -0,0 +1,216 @@
+from adis import (
+    Adis,
+    AdisBlock,
+    AdisFieldDefinition
+)
+from adis.adis_lines import (
+    AdisLine,
+    CommentLine,
+    DefinitionLine,
+    ValueLine
+)
+
+import pytest
+import os
+import json
+
+directory = os.path.dirname(__file__)
+if directory == "":
+    directory = os.getcwd()
+
+
+demo_json_file = os.path.join(directory, "sample.json")
+demo_adis_file = os.path.join(directory, "sample.ads")
+with open(demo_json_file, "r") as input_file:
+    json_input_data = json.loads(input_file.read())
+
+adis = Adis.from_json_file(demo_json_file)
+generated_json = adis.to_json()
+json_output_data = json.loads(generated_json)
+
+adis_out = adis.dumps()
+
+adis2 = Adis.parse(adis_out)
+adis2_out = adis2.dumps()
+
+
+def test_json_input_and_output():
+    assert json_input_data == json_output_data
+
+def test_adis_input_and_output():
+    assert adis_out == adis2_out
+
+def test_get_files():
+    adis_files = adis.get_files()
+    assert len(adis_files) == 2
+
+def test_parse_adis_file():
+    adis_from_adis_file = Adis.parse_from_file(demo_adis_file)
+    adis_from_json_file = Adis.from_json_file(demo_json_file)
+    assert adis_from_adis_file.dumps() == adis_from_json_file.dumps()
+
+def test_repr():
+    assert adis.__repr__() == "Adis containing 2 Adis-files"
+
+    adis_file = adis.get_files()[0]
+    assert adis_file.__repr__() == "AdisFile contains 2 blocks"
+
+    adis_block = adis_file.get_blocks()[0]
+    assert adis_block.__repr__() == "AdisBlock with status=H and entity_number=990001 " \
+        "containing 3 data row(s)"
+
+    adis_value = adis_block.get_data_rows()[0][0]
+    assert adis_value.__repr__() == "AdisValue: item_number=00000000, value=Euler number"
+
+    adis_field_definition = AdisFieldDefinition("12345678", 1, 1)
+    assert adis_field_definition.__repr__() == "AdisFieldDefinition: item_number=12345678, " \
+        "field_size=1, decimal_digits=1"
+    
+    adis_line = AdisLine.parse_line("EN")
+    assert adis_line.__repr__() == "End of logical file status: normal, line: EN"
+
+def test_from_json_exceptions():
+    with pytest.raises(Exception, match="The root element of the JSON has to be a list. " \
+        "Got <class 'dict'>."):
+        adis_from_json = Adis.from_json("{}")
+
+    with pytest.raises(Exception, match="Expecting a dict but got <class 'list'>."):
+        adis_from_json = Adis.from_json("[{}, []]")
+
+def test_adis_block_getters():
+    adis_block = adis.get_files()[0].get_blocks()[0]
+    assert len(adis_block.get_field_definitions()) == 3
+    assert len(adis_block.get_data_rows()) == 3
+
+def test_adis_block_exceptions():
+    with pytest.raises(Exception,
+        match="The entity number has to be a string consisting of 6 chars."):
+        AdisBlock("123", "N", [], [])
+
+    with pytest.raises(Exception,
+        match="Invalid status char. Has to be one of "):
+        AdisBlock("123456", "A", [], [])
+
+    with pytest.raises(Exception,
+        match="Status may only be one char."):
+        AdisBlock("123456", "NN", [], [])
+    
+    with pytest.raises(Exception,
+        match="\"status\" field is missing in block dict."):
+        AdisBlock.from_dict("123456", {})
+    
+    with pytest.raises(Exception,
+        match="\"definitions\" field is missing in block dict."):
+        AdisBlock.from_dict("123456", {
+            "status": "N"
+        })
+
+    with pytest.raises(Exception,
+        match="\"data\" field is missing in block dict."):
+        AdisBlock.from_dict("123456", {
+            "status": "N",
+            "definitions": []
+        })
+
+    with pytest.raises(Exception,
+        match="A field definition has to be a dict but got <class 'list'>."):
+        AdisBlock.from_dict("123456", {
+            "status": "N",
+            "definitions": [[]],
+            "data": []
+        })
+
+    with pytest.raises(Exception,
+        match="The data of each block has to be a list. Got <class 'dict'>."):
+        AdisBlock.from_dict("123456", {
+            "status": "N",
+            "definitions": [],
+            "data": {}
+        })
+
+    with pytest.raises(Exception,
+        match="Each data row has to be a dict. Got <class 'float'>."):
+        AdisBlock.from_dict("123456", {
+            "status": "N",
+            "definitions": [],
+            "data": [3.14]
+        })
+    
+    with pytest.raises(Exception,
+        match="Definition line is missing before value line"):
+        lines = []
+        lines.append(AdisLine.parse_line("VN123456helloworld"))
+        AdisBlock.from_lines(lines)
+
+    with pytest.raises(Exception,
+        match="Definition is missing."):
+        AdisBlock.from_lines([])
+
+def test_adis_line():
+    with pytest.raises(Exception,
+        match="Linetype End of logical file may not have status faulty"):
+        AdisLine.parse_line("EF")
+    
+    line = AdisLine.parse_line("VN123456abcdef")
+    assert line.get_type_char() == "V"
+    assert line.get_entity_number() == "123456"
+
+    with pytest.raises(Exception,
+        match="Length of definitions text is 10 but it has to be a multiple of 11"):
+        AdisLine.parse_line("DN1234561234567890")
+
+    line = AdisLine.parse_line("VN123456abc")
+    definitions = []
+    definition_for_5_chars = AdisFieldDefinition("12345678", 5, 0)
+    definitions.append(definition_for_5_chars)
+    definitions.append(definition_for_5_chars)
+    with pytest.raises(Exception,
+        match="Expecting an item text length of 10 chars or 5 chars, but got 3 chars."):
+        line.parse(definitions)
+
+def test_comment_line():
+    line = AdisLine.parse_line("CNHello World")
+    assert type(line) == CommentLine
+    assert line.get_comment() == "Hello World"
+
+def test_adis_field_definition():
+    with pytest.raises(Exception,
+        match="The item_number has to be a string with length = 8. Got \"1234567\""):
+        AdisFieldDefinition("1234567", None, None)
+    
+    with pytest.raises(Exception,
+        match="The field size has to be a number between 1 and 99. Got 0."):
+        AdisFieldDefinition("12345678", 0, None)
+    
+    with pytest.raises(Exception,
+        match="The field size has to be a number between 1 and 99. Got 100."):
+        AdisFieldDefinition("12345678", 100, None)
+    
+    with pytest.raises(Exception,
+        match="The number of decimal digits has to be a number between 0 and 9. Got -1."):
+        AdisFieldDefinition("12345678", 1, -1)
+    
+    with pytest.raises(Exception,
+        match="The number of decimal digits has to be a number between 0 and 9. Got 10."):
+        AdisFieldDefinition("12345678", 1, 10)
+    
+    adis_field_definition = AdisFieldDefinition("12345678", 1, 1)
+    assert adis_field_definition.get_item_number() == "12345678"
+    assert adis_field_definition.get_field_size() == 1
+    assert adis_field_definition.get_decimal_digits() == 1
+
+    with pytest.raises(Exception,
+        match="Number 0.1 is too large for this field."):
+        adis_field_definition.dumps_value(0.1)
+    
+    adis_field_definition = AdisFieldDefinition("12345678", 5, 0)
+    with pytest.raises(Exception,
+        match="value \"123456\" is too long for this field."):
+        adis_field_definition.dumps_value("123456")
+
+    with pytest.raises(Exception,
+        match="Expected field size of 5 chars or an empty field, but got " \
+                "field size of 4 chars."):
+        adis_field_definition.parse_field_at_position("1234", 0)
+    
+    assert adis_field_definition.parse_field_at_position("123", 3).value is None