Class Verbs

pattern/text/nl/inflect.py:218–326

#### VERB CONJUGATION ##############################################################################

class Verbs(_Verbs):
    
    def __init__(self):
        _Verbs.__init__(self, os.path.join(MODULE, "nl-verbs.txt"),
            language = "nl",
              format = [0, 1, 2, 3, 7, 8, 17, 18, 19, 23, 25, 24, 16, 9, 10, 11, 15, 33, 26, 27, 28, 32],
             default = {
                 1: 0,   2: 0,   3: 0,   7: 0,  # present singular
                 4: 7,   5: 7,   6: 7,          # present plural
                17: 25, 18: 25, 19: 25, 23: 25, # past singular
                20: 23, 21: 23, 22: 23,         # past plural
                 9: 16, 10: 16, 11: 16, 15: 16, # present singular negated
                12: 15, 13: 15, 14: 15,         # present plural negated
                26: 33, 27: 33, 28: 33,         # past singular negated
                29: 32, 30: 32, 31: 32, 32: 33  # past plural negated
            })
    
    def load(self):
        _Verbs.load(self)
        self._inverse["was"]   = "zijn" # Instead of "wassen".
        self._inverse["waren"] = "zijn"
        self._inverse["zagen"] = "zien"
        self._inverse["wist"]  = "weten"
    
    def find_lemma(self, verb):
        """ Returns the base form of the given inflected verb, using a rule-based approach.
            This is problematic if a verb ending in -e is given in the past tense or gerund.
        """
        v = verb.lower()
        # Common prefixes: op-bouwen and ver-bouwen inflect like bouwen.
        for prefix in ("aan", "be", "her", "in", "mee", "ont", "op", "over", "uit", "ver"):
            if v.startswith(prefix) and v[len(prefix):] in self.inflections:
                return prefix + self.inflections[v[len(prefix):]]
        # Present participle -end: hengelend, knippend.
        if v.endswith("end"):
            b = v[:-3]
        # Past singular -de or -te: hengelde, knipte.
        elif v.endswith(("de", "det", "te", "tet")):
            b = v[:-2]
        # Past plural -den or -ten: hengelden, knipten.
        elif v.endswith(("chten"),):
            b = v[:-2]
        elif v.endswith(("den", "ten")) and len(v) > 3 and is_vowel(v[-4]):
            b = v[:-2]
        elif v.endswith(("den", "ten")):
            b = v[:-3]
        # Past participle ge- and -d or -t: gehengeld, geknipt.
        elif v.endswith(("d","t")) and v.startswith("ge"):
            b = v[2:-1]    
        # Present 2nd or 3rd singular: wordt, denkt, snakt, wacht.
        elif v.endswith(("cht"),):
            b = v
        elif v.endswith(("dt", "bt", "gt", "kt", "mt", "pt", "wt", "xt", "aait", "ooit")):
            b = v[:-1]
        elif v.endswith("t") and len(v) > 2 and not is_vowel(v[-2]):
            b = v[:-1]
        elif v.endswith("en") and len(v) > 3:
            return v