l-systems/converter.py

from argparse import ArgumentParser
from csv import reader as csv_reader
from pprint import pformat
from xml.dom.minidom import parseString as xml_parser
from xml.etree.ElementTree import Element as XMLElement
from xml.etree.ElementTree import SubElement as XMLSubElement
from xml.etree.ElementTree import tostring as element_stringifier


class System:
    """Represents an L-System"""

    def __init__(
        self,
        name: str,
        base: list[str],
        axiom: str,
        substitutions: list[tuple[str, str]],
        interpretations: list[tuple[str, str]],
    ):
        self.name = name
        """System name"""

        self.base = base
        """Set used"""

        self.axiom = axiom
        """Axiom used at the start of iterations"""

        self.substitutions = substitutions
        """
        Substitution for each member of the base,
        represented as a couple (member, substitution)
        """

        self.interpretations = interpretations
        """
        Interpretation for each member of the base,
        represented as a couple (member, interpretation)
        """

        # Interpretation of extra symbols added if necessary
        extra_symbols = ["[", "]"]
        for _, substitution in substitutions:
            if any(symbol in substitution for symbol in extra_symbols):
                self.interpretations.extend(
                    [(extra_symbols[0], "STORE"), (extra_symbols[1], "RESTORE")]
                )
                break

    def __repr__(self):
        return pformat(object=self.__dict__, compact=True, width=120, sort_dicts=False)

    def to_xml(self) -> XMLElement:
        """Convert the current system into an XML element"""
        system = XMLElement("lsystem")

        base = XMLSubElement(system, "name")
        base.text = self.name

        base = XMLSubElement(system, "base")
        base.text = "".join(self.base)

        axiom = XMLSubElement(system, "axiom")
        axiom.text = self.axiom

        substitutions = XMLSubElement(system, "substitutions")
        for member, substitution in self.substitutions:
            sub_element = XMLSubElement(substitutions, "substitution")
            sub_element.set("member", member)
            sub_element.text = substitution

        interpretations = XMLSubElement(system, "interpretations")
        for member, interpretation in self.interpretations:
            inter_element = XMLSubElement(interpretations, "interpretation")
            inter_element.set("member", member)
            inter_element.text = interpretation

        return system


def data_reader(path: str, delimiter: str = ","):
    """Read a CSV file and returns a list of L-System"""
    res: list[System] = []
    with open(path) as csv_file:
        data = csv_reader(csv_file, delimiter=delimiter)
        for system in data:
            name = system[0]
            base = list(system[1])
            axiom = system[2]
            substitutions = [(v, system[3 + i]) for i, v in enumerate(base)]
            interpretations = [
                (v, system[3 + i + len(substitutions)]) for i, v in enumerate(base)
            ]

            res.append(System(name, base, axiom, substitutions, interpretations))

    return res


def lsystems_xml(systems: list[System]) -> XMLElement:
    """Convert list of L-system structure into XML"""

    root = XMLElement("lsystems")

    for system in systems:
        root.append(system.to_xml())

    return root


if __name__ == "__main__":
    parser = ArgumentParser(description="Generate XML representation of L-systems")
    parser.add_argument(
        "file", metavar="FILE", help="CSV file containing L-system data"
    )
    parser.add_argument(
        "-o", "--output", metavar="OUTPUT_FILE", help="Specify output file for XML"
    )

    args = parser.parse_args()

    # Read data
    lsystems = data_reader(args.file)

    # Generate XML
    xml = lsystems_xml(lsystems)

    # Add XML model declaration
    xml_string = (
        '<?xml-model href="l-systems.xsd"?>\n' + element_stringifier(xml).decode()
    )

    # Output XML
    dom = xml_parser(xml_string)
    pretty_xml = dom.toprettyxml(encoding="UTF-8").decode()
    if args.output:
        with open(args.output, "w") as output_file:
            output_file.write(pretty_xml)
    else:
        print(pretty_xml)