61 lines
1.6 KiB
Python
61 lines
1.6 KiB
Python
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"""
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Formatting numeric literals.
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"""
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from blib2to3.pytree import Leaf
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def format_hex(text: str) -> str:
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"""
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Formats a hexadecimal string like "0x12B3"
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"""
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before, after = text[:2], text[2:]
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return f"{before}{after.upper()}"
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def format_scientific_notation(text: str) -> str:
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"""Formats a numeric string utilizing scentific notation"""
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before, after = text.split("e")
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sign = ""
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if after.startswith("-"):
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after = after[1:]
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sign = "-"
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elif after.startswith("+"):
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after = after[1:]
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before = format_float_or_int_string(before)
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return f"{before}e{sign}{after}"
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def format_complex_number(text: str) -> str:
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"""Formats a complex string like `10j`"""
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number = text[:-1]
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suffix = text[-1]
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return f"{format_float_or_int_string(number)}{suffix}"
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def format_float_or_int_string(text: str) -> str:
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"""Formats a float string like "1.0"."""
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if "." not in text:
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return text
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before, after = text.split(".")
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return f"{before or 0}.{after or 0}"
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def normalize_numeric_literal(leaf: Leaf) -> None:
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"""Normalizes numeric (float, int, and complex) literals.
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All letters used in the representation are normalized to lowercase."""
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text = leaf.value.lower()
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if text.startswith(("0o", "0b")):
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# Leave octal and binary literals alone.
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pass
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elif text.startswith("0x"):
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text = format_hex(text)
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elif "e" in text:
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text = format_scientific_notation(text)
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elif text.endswith("j"):
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text = format_complex_number(text)
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else:
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text = format_float_or_int_string(text)
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leaf.value = text
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