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# Copyright (C) 2009 The Android Open Source Project
#
# 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.
"""A module for reading and parsing event-log-tags files."""
from __future__ import print_function
import re
import sys
class Tag(object):
__slots__ = ["tagnum", "tagname", "description", "filename", "linenum"]
def __init__(self, tagnum, tagname, description, filename, linenum):
self.tagnum = tagnum
self.tagname = tagname
self.description = description
self.filename = filename
self.linenum = linenum
class TagFile(object):
"""Read an input event-log-tags file."""
def AddError(self, msg, linenum=None):
if linenum is None:
linenum = self.linenum
self.errors.append((self.filename, linenum, msg))
def AddWarning(self, msg, linenum=None):
if linenum is None:
linenum = self.linenum
self.warnings.append((self.filename, linenum, msg))
def __init__(self, filename, file_object=None):
"""'filename' is the name of the file (included in any error
messages). If 'file_object' is None, 'filename' will be opened
for reading."""
self.errors = []
self.warnings = []
self.tags = []
self.options = {}
self.filename = filename
self.linenum = 0
if file_object is None:
try:
file_object = open(filename, "rb")
except (IOError, OSError) as e:
self.AddError(str(e))
return
try:
for self.linenum, line in enumerate(file_object):
self.linenum += 1
line = line.strip()
if not line or line[0] == '#': continue
parts = re.split(r"\s+", line, 2)
if len(parts) < 2:
self.AddError("failed to parse \"%s\"" % (line,))
continue
if parts[0] == "option":
self.options[parts[1]] = parts[2:]
continue
if parts[0] == "?":
tag = None
else:
try:
tag = int(parts[0])
except ValueError:
self.AddError("\"%s\" isn't an integer tag or '?'" % (parts[0],))
continue
tagname = parts[1]
if len(parts) == 3:
description = parts[2]
else:
description = None
if description:
# EventLog.java checks that the description field is
# surrounded by parens, so we should too (to avoid a runtime
# crash from badly-formatted descriptions).
if not re.match(r"\(.*\)\s*$", description):
self.AddError("tag \"%s\" has unparseable description" % (tagname,))
continue
self.tags.append(Tag(tag, tagname, description,
self.filename, self.linenum))
except (IOError, OSError) as e:
self.AddError(str(e))
def BooleanFromString(s):
"""Interpret 's' as a boolean and return its value. Raise
ValueError if it's not something we can interpret as true or
false."""
s = s.lower()
if s in ("true", "t", "1", "on", "yes", "y"):
return True
if s in ("false", "f", "0", "off", "no", "n"):
return False
raise ValueError("'%s' not a valid boolean" % (s,))
def WriteOutput(output_file, data):
"""Write 'data' to the given output filename (which may be None to
indicate stdout). Emit an error message and die on any failure.
'data' may be a string or a StringIO object."""
if not isinstance(data, str):
data = data.getvalue()
try:
if output_file is None:
out = sys.stdout
output_file = "<stdout>"
else:
out = open(output_file, "wb")
out.write(data)
out.close()
except (IOError, OSError) as e:
print("failed to write %s: %s" % (output_file, e), file=sys.stderr)
sys.exit(1)
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