114 lines
3.2 KiB
Python
114 lines
3.2 KiB
Python
# Copyright (c) 2014 Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import re
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import types
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import yaql
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import yaql.exceptions
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import yaql.expressions
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class YaqlExpression(object):
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def __init__(self, expression):
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if isinstance(expression, types.StringTypes):
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self._expression = str(expression)
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self._parsed_expression = yaql.parse(self._expression)
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self._file_position = None
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elif isinstance(expression, YaqlExpression):
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self._expression = expression._expression
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self._parsed_expression = expression._parsed_expression
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self._file_position = expression._file_position
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elif isinstance(expression, yaql.expressions.Expression):
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self._expression = str(expression)
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self._parsed_expression = expression
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self._file_position = None
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else:
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raise TypeError('expression is not of supported types')
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@property
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def expression(self):
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return self._expression
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@property
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def source_file_position(self):
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return self._file_position
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@source_file_position.setter
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def source_file_position(self, value):
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self._file_position = value
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def __repr__(self):
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return 'YAQL(%s)' % self._expression
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def __str__(self):
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return self._expression
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@staticmethod
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def match(expr):
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if not isinstance(expr, types.StringTypes):
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return False
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if re.match('^[\s\w\d.:]*$', expr):
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return False
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try:
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yaql.parse(expr)
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return True
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except yaql.exceptions.YaqlGrammarException:
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return False
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except yaql.exceptions.YaqlLexicalException:
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return False
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def evaluate(self, context=None):
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return self._parsed_expression.evaluate(context=context)
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class YaqlExpressionFilePosition(object):
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def __init__(self, file_path, start_line, start_column, start_index,
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end_line, end_column, length):
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self._file_path = file_path
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self._start_line = start_line
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self._start_column = start_column
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self._start_index = start_index
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self._end_line = end_line
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self._end_column = end_column
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self._length = length
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@property
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def file_path(self):
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return self._file_path
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@property
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def start_line(self):
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return self._start_line
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@property
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def start_column(self):
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return self._start_column
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@property
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def start_index(self):
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return self._start_index
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@property
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def end_line(self):
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return self._end_line
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@property
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def end_column(self):
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return self._end_column
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@property
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def length(self):
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return self._length
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