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ORPA-pyOpenRPA/WPy32-3720/python-3.7.2/Lib/site-packages/ptpython/validator.py

48 lines
1.6 KiB

6 years ago
from __future__ import unicode_literals
from prompt_toolkit.validation import Validator, ValidationError
__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=None):
self.get_compiler_flags = get_compiler_flags
def validate(self, document):
"""
Check input for Python syntax errors.
"""
# When the input starts with Ctrl-Z, always accept. This means EOF in a
# Python REPL.
if document.text.startswith('\x1a'):
return
try:
if self.get_compiler_flags:
flags = self.get_compiler_flags()
else:
flags = 0
compile(document.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.)
index = document.translate_row_col_to_index(e.lineno - 1, (e.offset or 1) - 1)
raise ValidationError(index, 'Syntax Error')
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)