import { SoftwarePackage } from '@stencila/schema';
import PackageGenerator from './PackageGenerator';
import IUrlFetcher from './IUrlFetcher';
/**
 * A Dockerfile generator for Python packages
 */
export default class PythonGenerator extends PackageGenerator {
    /**
     * The Python Major version, i.e. 2 or 3
     */
    private readonly pythonMajorVersion;
    /**
     * An instance of `PythonSystemPackageLookup` with which to look up system dependencies of Python packages
     */
    private readonly systemPackageLookup;
    constructor(urlFetcher: IUrlFetcher, pkg: SoftwarePackage, folder?: string, pythonMajorVersion?: number);
    /**
     * Return the `pythonMajorVersion` (as string) if it is not 2, otherwise return an empty string (if it is 2). This is
     * for appending to things like pip{3} or python{3}.
     */
    pythonVersionSuffix(): string;
    /**
     * Check if this Generator's package applies (if it is Python).
     */
    applies(): boolean;
    /**
     * Generate a list of system (apt) packages by looking up with `this.systemPackageLookup`.
     */
    aptPackages(sysVersion: string): Array<string>;
    /**
     * Build the contents of a `requirements.txt` file by joining the Python package name to its version specifier.
     */
    generateRequirementsContent(): string;
    /**
     * Get the pip command to install the Stencila package
     */
    stencilaInstall(sysVersion: string): string | undefined;
    /**
     * Write out the generated requirements content to `GENERATED_REQUIREMENTS_FILE` or none exists, just instruct the
     * copy of a `requirements.txt` file as part of the Dockerfile. If that does not exist, then no COPY should be done.
     */
    installFiles(sysVersion: string): Array<[string, string]>;
    /**
     * Generate the right pip command to install the requirements, appends the correct Python major version to `pip`.
     */
    installCommand(sysVersion: string): string | undefined;
    /**
     * The files to copy into the Docker image
     *
     * Copies all `*.py` files to the container
     */
    projectFiles(): Array<[string, string]>;
    /**
     * The command to execute in a container created from the Docker image
     *
     * If there is a top-level `main.py` or `cmd.py` then that will be used,
     * otherwise, the first `*.R` files by alphabetical order will be used.
     */
    runCommand(): string | undefined;
}