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#!/usr/bin/python3 -tt
# Copyright 2012 Jussi Pakkanen
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import parser
import nodes
class InterpreterException(Exception):
pass
class InvalidCode(InterpreterException):
pass
class Interpreter():
def __init__(self, code):
self.ast = parser.build_ast(code)
self.sanity_check_ast()
def sanity_check_ast(self):
if not isinstance(self.ast, nodes.CodeBlock):
raise InvalidCode('AST is of invalid type. Possibly a bug in the parser.')
if len(self.ast.get_statements()) == 0:
raise InvalidCode('No statements in code.')
first = self.ast.get_statements()[0]
if not isinstance(first, nodes.FunctionCall) or first.get_function_name() != 'project':
raise InvalidCode('First statement must be a call to project')
if __name__ == '__main__':
code = "project('myawesomeproject')"
i = Interpreter(code)
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