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78 lines
2.7 KiB
Python
78 lines
2.7 KiB
Python
"""Parse pollen info from SVG from IRM KMI api"""
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import logging
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import xml.etree.ElementTree as ET
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from typing import List
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from custom_components.irm_kmi.const import POLLEN_LEVEL_TO_COLOR, POLLEN_NAMES
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_LOGGER = logging.getLogger(__name__)
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class PollenParser:
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"""
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Extract pollen level from an SVG provided by the IRM KMI API.
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To get the data, match pollen names and pollen levels that are vertically aligned. Then, map the value to the
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corresponding color on the scale.
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"""
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def __init__(
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self,
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xml_string: str
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):
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self._xml = xml_string
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@staticmethod
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def get_default_data() -> dict:
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"""Return all the known pollen with 'none' value"""
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return {k.lower(): 'none' for k in POLLEN_NAMES}
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@staticmethod
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def get_unavailable_data() -> dict:
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"""Return all the known pollen with 'none' value"""
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return {k.lower(): None for k in POLLEN_NAMES}
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@staticmethod
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def get_option_values() -> List[str]:
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"""List all the values that the pollen can have"""
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return list(POLLEN_LEVEL_TO_COLOR.values()) + ['none']
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@staticmethod
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def _extract_elements(root) -> List[ET.Element]:
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"""Recursively collect all elements of the SVG in a list"""
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elements = []
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for child in root:
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elements.append(child)
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elements.extend(PollenParser._extract_elements(child))
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return elements
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@staticmethod
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def _get_elem_text(e) -> str | None:
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if e.text is not None:
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return e.text.strip()
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return None
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def get_pollen_data(self) -> dict:
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"""From the XML string, parse the SVG and extract the pollen data from the image.
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If an error occurs, return the default value"""
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pollen_data = self.get_default_data()
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try:
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_LOGGER.debug(f"Full SVG: {self._xml}")
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root = ET.fromstring(self._xml)
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except ET.ParseError:
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_LOGGER.warning("Could not parse SVG pollen XML")
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return pollen_data
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elements: List[ET.Element] = self._extract_elements(root)
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pollens = {e.attrib.get('x', None): self._get_elem_text(e).lower()
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for e in elements if 'tspan' in e.tag and self._get_elem_text(e) in POLLEN_NAMES}
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pollen_levels = {e.attrib.get('x', None): POLLEN_LEVEL_TO_COLOR[self._get_elem_text(e)]
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for e in elements if 'tspan' in e.tag and self._get_elem_text(e) in POLLEN_LEVEL_TO_COLOR}
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for position, pollen in pollens.items():
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if position is not None and position in pollen_levels:
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pollen_data[pollen] = pollen_levels[position]
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_LOGGER.debug(f"Pollen data: {pollen_data}")
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return pollen_data
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