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38 lines
1.4 KiB
Python
38 lines
1.4 KiB
Python
import re
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def clumpFractions(s):
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"""
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Replaces the whitespace between the integer and fractional part of a quantity
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with a dollar sign, so it's interpreted as a single token. The rest of the
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string is left alone.
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clumpFractions("aaa 1 2/3 bbb")
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# => "aaa 1$2/3 bbb"
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"""
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return re.sub(r"(\d+)\s+(\d)/(\d)", r"\1$\2/\3", s)
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def tokenize(s):
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"""
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Tokenize on parenthesis, punctuation, spaces and American units followed by a slash.
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We sometimes give American units and metric units for baking recipes. For example:
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* 2 tablespoons/30 mililiters milk or cream
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* 2 1/2 cups/300 grams all-purpose flour
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The recipe database only allows for one unit, and we want to use the American one.
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But we must split the text on "cups/" etc. in order to pick it up.
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"""
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# handle abbreviation like "100g" by treating it as "100 grams"
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s = re.sub(r"(\d+)g", r"\1 grams", s)
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s = re.sub(r"(\d+)oz", r"\1 ounces", s)
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s = re.sub(r"(\d+)ml", r"\1 milliliters", s, flags=re.IGNORECASE)
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american_units = ["cup", "tablespoon", "teaspoon", "pound", "ounce", "quart", "pint"]
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# The following removes slashes following American units and replaces it with a space.
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for unit in american_units:
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s = s.replace(unit + "/", unit + " ")
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s = s.replace(unit + "s/", unit + "s ")
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return [token.strip() for token in re.split(r"([,()\s]{1})", clumpFractions(s)) if token and token.strip()]
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