dda-devops-build/file_handlers.py

from abc import ABC, abstractmethod 
import json
import re

class FileHandler(ABC):

    @classmethod
    def from_file_path(cls, file_path):
        config_file_type = file_path.suffix
        match config_file_type:
            case '.json':
                file_handler = JsonFileHandler()
            case '.gradle':
                file_handler = GradleFileHandler()
            case _:
                raise Exception(f'The file type "{config_file_type}" is not implemented')

        file_handler.config_file_path = file_path
        file_handler.config_file_type = config_file_type
        return file_handler

    @abstractmethod
    def parse(self) -> tuple[list[int], bool]:
        pass
    
    @abstractmethod
    def write(self, version_string):
        pass

class JsonFileHandler(FileHandler):

    def parse(self) -> tuple[list[int], bool]:
        with open(self.config_file_path, 'r') as json_file:
            json_version = json.load(json_file)['version']
            is_snapshot = False
            if '-SNAPSHOT' in json_version:
                is_snapshot = True
                json_version = json_version.replace('-SNAPSHOT', '')
            version = [int(x) for x in json_version.split('.')]
            return version, is_snapshot

    def write(self, version_string):
        with open(self.config_file_path, 'r+') as json_file:
            json_data = json.load(json_file)
            json_data['version'] = version_string
            json_file.seek(0)            
            json.dump(json_data, json_file, indent=4)
            json_file.truncate()


class GradleFileHandler(FileHandler):

    def parse(self) -> tuple[list[int], bool]:
        with open(self.config_file_path, 'r') as gradle_file:
            contents = gradle_file.read()
            version_line = re.search("\nversion = .*\n", contents)
            if version_line is None:
                raise Exception("Version not found in gradle file")
            
            version_line = version_line.group()
            version_string = re.search('[0-9]*\\.[0-9]*\\.[0-9]*(-SNAPSHOT)?', version_line)
            if version_string is None:
                raise Exception("Version not found in gradle file")
            
            version_string = version_string.group()
            is_snapshot = False
            if '-SNAPSHOT' in version_string:
                is_snapshot = True
                version_string = version_string.replace('-SNAPSHOT', '')

            version = [int(x) for x in version_string.split('.')]

            return version, is_snapshot

    def write(self, version_string):
        with open(self.config_file_path, 'r+') as gradle_file:
            gradle_contents = gradle_file.read()
            version_substitute = re.sub("\nversion = .*\n", f'\nversion = "{version_string}"\n', gradle_contents)
            gradle_file.seek(0)
            gradle_file.write(version_substitute)
            gradle_file.truncate()