Exscript/interpreter/fail.py
#
# Copyright (C) 2010-2017 Samuel Abels
# The MIT License (MIT)
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
from __future__ import print_function, absolute_import
from ..parselib import Token
from .expression import Expression
from .exception import FailException
class Fail(Token):
def __init__(self, lexer, parser, parent):
Token.__init__(self, 'Fail', lexer, parser, parent)
self.expression = None
# "fail" keyword.
lexer.expect(self, 'keyword', 'fail')
lexer.expect(self, 'whitespace')
self.msg = Expression(lexer, parser, parent)
# 'If' keyword with an expression.
# token = lexer.token()
if lexer.next_if('keyword', 'if'):
lexer.expect(self, 'whitespace')
self.expression = Expression(lexer, parser, parent)
# End of expression.
self.mark_end()
lexer.skip(['whitespace', 'newline'])
def value(self, context):
if self.expression is None or self.expression.value(context)[0]:
raise FailException(self.msg.value(context)[0])
return 1
def dump(self, indent=0):
print((' ' * indent) + self.name, 'start')
self.msg.dump(indent + 1)
self.expression.dump(indent + 1)
print((' ' * indent) + self.name, 'end.')