385 lines
11 KiB
Python
385 lines
11 KiB
Python
""" Lark transformer for mapping Lark tokens to Ziffers objects """
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from typing import Optional
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from lark import Transformer
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from .classes import (
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Ziffers,
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Whitespace,
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DurationChange,
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OctaveChange,
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OctaveAdd,
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Pitch,
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Rest,
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RandomPitch,
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RandomPercent,
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Chord,
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RomanNumeral,
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Sequence,
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ListSequence,
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RepeatedListSequence,
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Subdivision,
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Cyclic,
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RandomInteger,
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Range,
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Operator,
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ListOperation,
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Operation,
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Eval,
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Atom,
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Integer,
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Euclid,
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RepeatedSequence,
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VariableAssignment,
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Variable
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)
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from .common import flatten, sum_dict
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from .defaults import DEFAULT_DURS, OPERATORS
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from .scale import parse_roman, chord_from_roman_numeral
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# pylint: disable=locally-disabled, unused-argument, too-many-public-methods, invalid-name
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class ZiffersTransformer(Transformer):
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"""Rules for transforming Ziffers expressions into tree."""
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def start(self, items) -> Ziffers:
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"""Root for the rules"""
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return Ziffers(values=items[0], options={})
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def sequence(self, items):
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"""Flatten sequence"""
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return flatten(items)
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def rest(self, items):
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"""Return duration event"""
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if len(items)>0:
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chars = items[0]
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val = DEFAULT_DURS[chars[0]]
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# TODO: Add support for dots
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#if len(chars)>1:
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# dots = len(chars)-1
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# val = val * (2.0 - (1.0 / (2 * dots)))
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return Rest(text=chars+"r", duration=val)
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return Rest(text="r")
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return Rest(text=chars+"r", duration=val)
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def rest_duration(self,items):
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return items[0].value
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def random_integer(self, item) -> RandomInteger:
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"""Parses random integer syntax"""
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val = item[0][1:-1].split(",")
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return RandomInteger(min=int(val[0]), max=int(val[1]), text=item[0].value)
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def range(self, item) -> Range:
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"""Parses range syntax"""
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val = item[0].split("..")
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return Range(start=int(val[0]), end=int(val[1]), text=item[0].value)
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def cycle(self, items) -> Cyclic:
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"""Parses cycle"""
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values = items[0]
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return Cyclic(values=values)
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def pitch_class(self, item):
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"""Parses pitch class"""
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# If there are prefixes
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if len(item) > 1:
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# Collect&sum prefixes from any order: _qee^s4 etc.
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result = sum_dict(item)
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return Pitch(**result)
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val = item[0]
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return Pitch(**val)
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def pitch(self, items):
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"""Return pitch class info"""
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text_value = items[0].value.replace("T","10").replace("E","11")
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return {"pitch_class": int(text_value), "text": items[0].value}
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def prefix(self, items):
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"""Return prefix"""
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return items[0]
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def oct_change(self, items):
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"""Parses octave change"""
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octave = items[0]
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return [OctaveChange(value=octave["octave"], text=octave["text"]), items[1]]
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def oct_mod(self, items):
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"""Parses octave modification"""
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octave = items[0]
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return [OctaveAdd(value=octave["octave"], text=octave["text"]), items[1]]
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def escaped_octave(self, items):
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"""Return octave info"""
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value = items[0][1:-1]
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return {"octave": int(value), "text": items[0].value}
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def octave(self, items):
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"""Return octaves ^ and _"""
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value = sum(1 if char == "^" else -1 for char in items[0].value)
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return {"octave": value, "text": items[0].value}
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def modifier(self, items):
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"""Return modifiers # and b"""
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value = 1 if items[0].value == "#" else -1
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return {"modifier": value}
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def chord(self, items):
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"""Parses chord"""
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return Chord(pitch_classes=items, text="".join([val.text for val in items]))
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def named_roman(self, items) -> RomanNumeral:
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"""Parse chord from roman numeral"""
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numeral = items[0].value
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if len(items) > 1:
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name = items[1]
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chord_notes = chord_from_roman_numeral(numeral, name)
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parsed_number = parse_roman(numeral)
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return RomanNumeral(
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text=numeral, value=parsed_number, chord_type=name, notes=chord_notes
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)
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return RomanNumeral(
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value=parse_roman(numeral),
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text=numeral,
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notes=chord_from_roman_numeral(numeral),
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)
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def chord_name(self, item):
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"""Return name for chord"""
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return item[0].value
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def roman_number(self, item):
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"""Return roman numeral"""
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return item.value
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def dur_change(self, items):
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"""Parses duration change"""
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durs = items[0]
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return DurationChange(value=durs["duration"], text=durs["text"])
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def char_change(self, items):
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"""Return partial duration char info"""
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chars = ""
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durs = 0.0
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for dchar, dots in items:
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val = DEFAULT_DURS[dchar]
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if dots > 0:
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val = val * (2.0 - (1.0 / (2 * dots)))
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chars = chars + (dchar + "." * dots)
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durs = durs + val
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return {"text": chars, "duration": durs}
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def dchar_not_prefix(self, items):
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"""Return partial duration char info"""
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dur = items[0].split(".", 1)
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dots = 0
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if len(dur) > 1:
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dots = len(dur[1]) + 1
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return [dur[0], dots]
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def escaped_decimal(self, items):
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"""Return partial decimal info"""
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val = items[0]
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val["text"] = "<" + val["text"] + ">"
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return val
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def random_pitch(self, items):
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"""Parses random pitch"""
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return RandomPitch(text="?")
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def random_percent(self, items):
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"""Parses random percent"""
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return RandomPercent(text="%")
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def duration_chars(self, items):
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"""Return partial duration info"""
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durations = [val[1] for val in items]
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characters = "".join([val[0] for val in items])
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return {"duration": sum(durations), "text": characters}
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def dotted_dur(self, items):
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"""Return partial duration info"""
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key = items[0]
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val = DEFAULT_DURS[key]
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dots = len(items) - 1
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if dots > 0:
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val = val * (2.0 - (1.0 / (2 * dots)))
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return [key + "." * dots, val]
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def decimal(self, items):
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"""Return partial duration info"""
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val = items[0]
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return {"duration": float(val), "text": val.value}
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def dot(self, items):
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"""Return partial duration info"""
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return "."
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def dchar(self, items):
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"""Return partial duration info"""
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chardur = items[0].value
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return chardur
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def WS(self, items):
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"""Parse whitespace"""
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return Whitespace(text=items[0])
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def subdivision(self, items):
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"""Parse subdivision"""
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values = flatten(items[0])
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return Subdivision(
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values=values, wrap_start="[", wrap_end="]"
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)
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def subitems(self, items):
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"""Return subdivision items"""
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return items
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# Eval rules
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def eval(self, items):
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"""Parse eval"""
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val = items[0]
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return Eval(values=val)
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def sub_operations(self, items):
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"""Returns list of operations"""
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return Eval(values=items[0], wrap_start="(", wrap_end=")")
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def operation(self, items):
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"""Return partial eval operations"""
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return flatten(items)
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def atom(self, token):
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"""Return partial eval item"""
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val = token[0].value
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return Atom(value=val, text=val)
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# Variable assignment
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def assignment(self, items):
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var = items[0]
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op = items[1]
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content = items[2]
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return VariableAssignment(variable=var, value=content, text=var.text+"="+content.text, pre_eval=True if op == "=" else False)
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def ass_op(self,items):
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return items[0].value
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def variable(self, items):
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return Variable(name=items[0].value, text=items[0].value)
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# List rules
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def list(self, items):
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"""Parse list sequence notation, ex: (1 2 3)"""
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if len(items) > 1:
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prefixes = sum_dict(items[0:-1])
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values = items[-1]
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seq = ListSequence(values=values, wrap_start=prefixes["text"] + "(")
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seq.update_values(prefixes)
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return seq
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else:
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seq = ListSequence(values=items[0])
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return seq
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def repeated_list(self, items):
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"""Parse repeated list notation ex: (: 1 2 3 :)"""
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if len(items) > 2:
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prefixes = sum_dict(items[0:-2]) # If there are prefixes
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if items[-1] is not None:
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seq = RepeatedListSequence(
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values=items[-2],
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repeats=items[-1],
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wrap_end=":" + items[-1].text + ")",
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)
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else:
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seq = RepeatedListSequence(
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values=items[-2], repeats=Integer(text="2", value=2)
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)
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seq.update_values(prefixes)
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return seq
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else:
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if items[-1] is not None:
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seq = RepeatedListSequence(
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values=items[-2],
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repeats=items[-1],
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wrap_end=":" + items[-1].text + ")",
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)
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else:
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seq = RepeatedListSequence(
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values=items[-2], repeats=Integer(text="2", value=2)
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)
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return seq
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def NUMBER(self, token):
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"""Parse integer"""
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val = token.value
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return Integer(text=val, value=int(val))
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def number(self, item):
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"""Return partial number (Integer or RandomInteger)"""
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return item[0]
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def cyclic_number(self, item):
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"""Parse cyclic notation"""
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return Cyclic(values=item)
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def lisp_operation(self, items):
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"""Parse lisp like list operation"""
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op = items[0]
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values = items[1:]
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return Operation(
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operator=op,
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values=values,
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text="(+" + "".join([v.text for v in values]) + ")",
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)
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def operator(self, token):
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"""Parse operator"""
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val = token[0].value
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return Operator(text=val, value=OPERATORS[val])
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def list_items(self, items):
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"""Parse sequence"""
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return Sequence(values=items)
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def list_op(self, items):
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"""Parse list operation"""
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return ListOperation(values=items)
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def right_op(self,items):
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"""Get right value for the operation"""
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return items[0]
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def euclid(self, items):
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"""Parse euclid notation"""
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params = items[1][1:-1].split(",")
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init = {"onset": items[0], "pulses": int(params[0]), "length": int(params[1])}
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text = items[0].text + items[1]
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if len(params) > 2:
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init["rotate"] = int(params[2])
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if len(items) > 2:
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init["offset"] = items[2]
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text = text + items[2].text
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init["text"] = text
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return Euclid(**init)
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def euclid_operator(self, token):
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"""Return euclid operators"""
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return token.value
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def repeat(self, items):
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"""Parse repeated sequence, ex: [: 1 2 3 :]"""
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if items[-1] is not None:
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return RepeatedSequence(
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values=items[0], repeats=items[-1], wrap_end=":" + items[-1].text + "]"
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)
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else:
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return RepeatedSequence(values=items[0], repeats=Integer(value=2, text="2"))
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def repeat_item(self, items):
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return RepeatedListSequence(values=[items[0]],repeats=items[1], wrap_start="", wrap_end=":"+items[1].text) |