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# -*- coding: utf-8 -*-
#
# Copyright (C) 2015 Matt Martz <matt@sivel.net>
# Copyright (C) 2015 Rackspace US, Inc.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import ast
import sys
from io import BytesIO, TextIOWrapper
import yaml
import yaml.reader
def find_globals(g, tree):
"""Uses AST to find globals in an ast tree"""
for child in tree:
if hasattr(child, 'body') and isinstance(child.body, list):
find_globals(g, child.body)
elif isinstance(child, (ast.FunctionDef, ast.ClassDef)):
g.add(child.name)
continue
elif isinstance(child, ast.Assign):
try:
g.add(child.targets[0].id)
except (IndexError, AttributeError):
pass
elif isinstance(child, ast.Import):
g.add(child.names[0].name)
elif isinstance(child, ast.ImportFrom):
for name in child.names:
g_name = name.asname or name.name
if g_name == '*':
continue
g.add(g_name)
class CaptureStd():
"""Context manager to handle capturing stderr and stdout"""
def __enter__(self):
self.sys_stdout = sys.stdout
self.sys_stderr = sys.stderr
sys.stdout = self.stdout = TextIOWrapper(BytesIO(), encoding=self.sys_stdout.encoding)
sys.stderr = self.stderr = TextIOWrapper(BytesIO(), encoding=self.sys_stderr.encoding)
return self
def __exit__(self, exc_type, exc_value, traceback):
sys.stdout = self.sys_stdout
sys.stderr = self.sys_stderr
def get(self):
"""Return ``(stdout, stderr)``"""
return self.stdout.getvalue(), self.stderr.getvalue()
def parse_yaml(value, lineno, module, name, load_all=False):
traces = []
errors = []
data = None
if load_all:
loader = yaml.safe_load_all
else:
loader = yaml.safe_load
try:
data = loader(value)
if load_all:
data = list(data)
except yaml.MarkedYAMLError as e:
e.problem_mark.line += lineno - 1
e.problem_mark.name = '%s.%s' % (module, name)
errors.append({
'msg': '%s is not valid YAML' % name,
'line': e.problem_mark.line + 1,
'column': e.problem_mark.column + 1
})
traces.append(e)
except yaml.reader.ReaderError as e:
traces.append(e)
# TODO: Better line/column detection
errors.append({
'msg': ('%s is not valid YAML. Character '
'0x%x at position %d.' % (name, e.character, e.position)),
'line': lineno
})
except yaml.YAMLError as e:
traces.append(e)
errors.append({
'msg': '%s is not valid YAML: %s: %s' % (name, type(e), e),
'line': lineno
})
return data, errors, traces
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