PythonKulitta/Chunk.py at master · donya/PythonKulitta · GitHub

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from PythonEuterpea import *

class Chunk:

    def __init__(self, kind, value):
        self.kind = kind
        self.value = value
        self.onset = 0
        self.end = 0
        self.dur = 0

        if (kind=="R"): # value is a tuple of onset and duration
            self.onset = value[0]
            self.dur = value[1]
            self.end = self.onset + self.dur
        elif (kind=="E"): # value is an MEvent
            self.onset = self.value.eTime
            self.dur = self.value.dur
            self.end = self.onset + self.dur
        elif (kind=="Seq"): # value is a list of back-to-back chunks sorted by onset
            if (len(self.value) > 0):
                self.onset = self.value[0].onset
                self.dur = sum (map (lambda x: x.dur, self.value))
                self.end = self.value[-1].onset + self.value[-1].dur
        elif (kind=="Chord"): # value is a list of chunks with identical onsets and durs
            if (len(self.value) > 0):
                self.onset = self.value[0].onset
                self.dur = self.value[0].dur
                self.end = self.value[0].end
        elif (kind=="Par"): # value is a list of potentially overlapping chunks
            if (len(self.value) > 0):
                self.onset = min(map(lambda x:x.onset, self.value))
                self.end = min(map (lambda x:x.end, self.value))
                self.dur = self.end - self.onset
        else:
            raise Exception("Unrecognized Chunk kind: "+kind)

    def __str__(self):
        if (self.kind=="E"):
            return self.kind + " "+str(self.value.eTime)+" "+str(self.value.pitch)+" "+str(self.value.dur)
        else:
            return self.kind + " "+str(self.value)

    def __repr__(self):
        return str(self)

    def toMusic(self):
        if (self.kind=="R"):
            return Rest(self.value[1])
        elif (self.kind=="E"):
            return Note(self.value.pitch, self.value.dur, self.value.vol)
        elif (self.kind=="Seq"):
            return line(map(lambda x: x.toMusic(), self.value))
        elif (self.kind=="Chord"):
            return chord(map(lambda x: x.toMusic(), self.value))
        elif (self.kind=="Par"):
            return chord(map(lambda x: line([Rest(x.onset), x.toMusic()]), self.value))
        else:
            raise Exception("Unrecognized Chunk kind: "+self.kind)