62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
from __future__ import annotations
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from typing import Callable, Optional
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from prompt_toolkit.document import Document
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from prompt_toolkit.validation import ValidationError, Validator
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from .utils import unindent_code
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__all__ = ["PythonValidator"]
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class PythonValidator(Validator):
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"""
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Validation of Python input.
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:param get_compiler_flags: Callable that returns the currently
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active compiler flags.
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"""
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def __init__(self, get_compiler_flags: Callable[[], int] | None = None) -> None:
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self.get_compiler_flags = get_compiler_flags
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def validate(self, document: Document) -> None:
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"""
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Check input for Python syntax errors.
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"""
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text = unindent_code(document.text)
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# When the input starts with Ctrl-Z, always accept. This means EOF in a
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# Python REPL.
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if text.startswith("\x1a"):
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return
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# When the input starts with an exclamation mark. Accept as shell
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# command.
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if text.lstrip().startswith("!"):
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return
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try:
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if self.get_compiler_flags:
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flags = self.get_compiler_flags()
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else:
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flags = 0
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compile(text, "<input>", "exec", flags=flags, dont_inherit=True)
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except SyntaxError as e:
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# Note, the 'or 1' for offset is required because Python 2.7
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# gives `None` as offset in case of '4=4' as input. (Looks like
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# fixed in Python 3.)
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# TODO: This is not correct if indentation was removed.
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index = document.translate_row_col_to_index(
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(e.lineno or 1) - 1, (e.offset or 1) - 1
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)
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raise ValidationError(index, f"Syntax Error: {e}")
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except TypeError as e:
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# e.g. "compile() expected string without null bytes"
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raise ValidationError(0, str(e))
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except ValueError as e:
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# In Python 2, compiling "\x9" (an invalid escape sequence) raises
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# ValueError instead of SyntaxError.
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raise ValidationError(0, "Syntax Error: %s" % e)
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