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