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parsing.py
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parsing.py
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#!/usr/bin/env python
# Copyright 2016 DIANA-HEP
#
# 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 histogrammar.pycparser.c_parser
import histogrammar.pycparser.c_generator
import histogrammar.pycparser.c_ast
class C99SourceToAst(object):
def __init__(self, wholeFile=False):
self.wholeFile = wholeFile
self.parser = histogrammar.pycparser.c_parser.CParser(
lextab="histogrammar.pycparser.lextab", yacctab="histogrammar.pycparser.yacctab")
def __call__(self, src):
if self.wholeFile:
return self.parser.parse(src)
else:
src = "void wrappedAsFcn() {" + src + ";}"
ast = self.parser.parse(src).ext[0].body.block_items
if len(ast) < 1:
raise SyntaxError("empty expression")
else:
return [x for x in ast if not isinstance(x, histogrammar.pycparser.c_ast.EmptyStatement)]
class C99AstToSource(object):
def __init__(self):
self.generator = histogrammar.pycparser.c_generator.CGenerator()
def __call__(self, ast):
if isinstance(ast, (list, tuple)):
return "; ".join(self.generator.visit(x).strip() for x in ast)
return self.generator.visit(ast).strip()