114 lines
3.4 KiB
Python
114 lines
3.4 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 types
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from murano.dsl import dsl_exception
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from murano.dsl import helpers
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from murano.dsl import lhs_expression
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from murano.dsl import yaql_expression
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_macros = []
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class InstructionStub(object):
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def __init__(self, title, position):
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self._title = title
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self.source_file_position = position
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def __str__(self):
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return self._title
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def register_macro(cls):
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_macros.append(cls)
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class DslExpression(object):
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def execute(self, context):
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pass
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class Statement(DslExpression):
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def __init__(self, statement):
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if isinstance(statement, yaql_expression.YaqlExpression):
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key = None
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value = statement
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elif isinstance(statement, types.DictionaryType):
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if len(statement) != 1:
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raise SyntaxError()
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key = statement.keys()[0]
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value = statement[key]
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else:
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raise SyntaxError()
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self._destination = lhs_expression.LhsExpression(key) if key else None
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self._expression = value
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@property
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def destination(self):
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return self._destination
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@property
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def expression(self):
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return self._expression
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def execute(self, context):
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try:
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result = helpers.evaluate(self.expression, context)
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if self.destination:
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self.destination(result, context)
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return result
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except dsl_exception.MuranoPlException:
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raise
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except Exception as e:
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raise dsl_exception.MuranoPlException.from_python_exception(
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e, context)
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def parse_expression(expr):
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result = None
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if isinstance(expr, yaql_expression.YaqlExpression):
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result = Statement(expr)
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elif isinstance(expr, types.DictionaryType):
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kwds = {}
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for key, value in expr.iteritems():
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if isinstance(key, yaql_expression.YaqlExpression):
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if result is not None:
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raise ValueError()
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result = Statement(expr)
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else:
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kwds[key] = value
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if result is None:
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for cls in _macros:
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try:
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macro = cls(**kwds)
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position = None
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title = 'block construct'
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if hasattr(expr, 'source_file_position'):
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position = expr.source_file_position
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if '__str__' in cls.__dict__:
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title = str(macro)
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macro.virtual_instruction = InstructionStub(
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title, position)
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return macro
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except TypeError:
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continue
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if result is None:
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raise SyntaxError(
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'Syntax is incorrect in expression: {0}'.format(expr))
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return result
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