ipyleaflet_categorized_qml.py

import xmltodict

def parse_categorized_qml(qml_fname):
    with open(qml_fname, "rb") as f:
        qml = xmltodict.parse(f)
    column = qml["qgis"]["renderer-v2"]["@attr"]
    symbols = {
        symbol["@name"]:{
            prop["@k"]:prop["@v"] for prop in symbol["layer"]["prop"]
        }
        for symbol in qml["qgis"]["renderer-v2"]["symbols"]["symbol"]
    }
    classes = {
        category['@value']:symbols[category['@symbol']]
        for category in qml["qgis"]["renderer-v2"]["categories"]["category"]
    }
    return column, classes

def build_style_callback(column, classes):
    styles = {}
    for cls, style in classes.items():
        *color, opacity = [int(i) for i in style["outline_color"].split(",")]
        *fillColor, fillOpacity = [int(i) for i in style["color"].split(",")]
        styles[cls] = {
            "color": f"#{color[0]:02x}{color[1]:02x}{color[2]:02x}",
            "opacity": opacity/255,
            "weight": float(style["outline_width"]),
            "fillColor": f"#{fillColor[0]:02x}{fillColor[1]:02x}{fillColor[2]:02x}",
            "fillOpacity": fillOpacity/255
        }
    def style_callback(feature):
        value = feature["properties"][column]
        return styles[value if value is not None else ""]

    return style_callback