Miika Alonen
f0e1aca247
Added more items to shorter repeat syntax: 124:3 A=(1 2) A:4 Prefixes now work for more items: q..r qs(1 2 3) Duration support for list operations: (q1 e3)+(1 4 3 5)
68 lines
1.7 KiB
Python
68 lines
1.7 KiB
Python
""" Module for the parser """
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from pathlib import Path
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from functools import lru_cache
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from lark import Lark
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from .classes import Ziffers
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from .mapper import ZiffersTransformer
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grammar_path = Path(__file__).parent
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grammar_folder = Path.joinpath(grammar_path, "spec")
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grammar_file = Path.joinpath(grammar_folder, "ziffers.lark")
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ziffers_parser = Lark.open(
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str(grammar_file),
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rel_to=__file__,
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start="root",
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parser="lalr",
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transformer=ZiffersTransformer(),
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)
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def parse_expression(expr: str) -> Ziffers:
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"""Parse an expression using the Ziffers parser
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Args:
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expr (str): Ziffers expression as a string
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Returns:
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Ziffers: Reutrns Ziffers iterable
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"""
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return ziffers_parser.parse(expr)
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@lru_cache
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def zparse(expr: str, **opts) -> Ziffers:
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"""Parses ziffers expression with options
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Args:
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expr (str): Ziffers expression as a string
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opts (dict, optional): Options for parsing the Ziffers expression. Defaults to None.
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Returns:
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Ziffers: Returns Ziffers iterable parsed with the given options
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"""
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parsed = parse_expression(expr)
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parsed.init_opts(opts)
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return parsed
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# pylint: disable=invalid-name
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def z(expr: str, **opts) -> Ziffers:
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"""Shortened method name for zparse"""
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return zparse(expr, **opts)
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def yield_items(gen: Ziffers, num: int, key: str = None) -> list:
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"""Yield n items from parsed Ziffers"""
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for i in range(num):
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if key is not None:
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yield getattr(gen[i],key,None)
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else:
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yield gen[i]
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def collect(gen: Ziffers, num: int, key: str = None) -> list:
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"""Collect n-item from parsed Ziffers"""
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return list(yield_items(gen,num,key))
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