mirror of
https://github.com/home-assistant/core
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35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
"""Util for Conversation."""
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import re
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def create_matcher(utterance):
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"""Create a regex that matches the utterance."""
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# Split utterance into parts that are type: NORMAL, GROUP or OPTIONAL
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# Pattern matches (GROUP|OPTIONAL): Change light to [the color] {name}
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parts = re.split(r"({\w+}|\[[\w\s]+\] *)", utterance)
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# Pattern to extract name from GROUP part. Matches {name}
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group_matcher = re.compile(r"{(\w+)}")
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# Pattern to extract text from OPTIONAL part. Matches [the color]
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optional_matcher = re.compile(r"\[([\w ]+)\] *")
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pattern = ["^"]
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for part in parts:
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group_match = group_matcher.match(part)
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optional_match = optional_matcher.match(part)
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# Normal part
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if group_match is None and optional_match is None:
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pattern.append(part)
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continue
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# Group part
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if group_match is not None:
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pattern.append(fr"(?P<{group_match.groups()[0]}>[\w ]+?)\s*")
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# Optional part
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elif optional_match is not None:
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pattern.append(fr"(?:{optional_match.groups()[0]} *)?")
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pattern.append("$")
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return re.compile("".join(pattern), re.I)
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