146 строки
4.7 KiB
Python
146 строки
4.7 KiB
Python
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import constants
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import logging
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import traceback
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import warnings
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# Location where chrome reads command line flags from
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CHROME_COMMAND_FILE = '/data/local/chrome-command-line'
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class FlagChanger(object):
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"""Changes the flags Chrome runs with.
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There are two different use cases for this file:
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* Flags are permanently set by calling Set().
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* Flags can be temporarily set for a particular set of unit tests. These
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tests should call Restore() to revert the flags to their original state
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once the tests have completed.
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"""
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def __init__(self, android_cmd):
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self._android_cmd = android_cmd
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# Save the original flags.
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self._orig_line = self._android_cmd.GetFileContents(CHROME_COMMAND_FILE)
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if self._orig_line:
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self._orig_line = self._orig_line[0].strip()
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# Parse out the flags into a list to facilitate adding and removing flags.
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self._current_flags = self._TokenizeFlags(self._orig_line)
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def Get(self):
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"""Returns list of current flags."""
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return self._current_flags
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def Set(self, flags):
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"""Replaces all flags on the current command line with the flags given.
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Args:
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flags: A list of flags to set, eg. ['--single-process'].
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"""
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if flags:
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assert flags[0] != 'chrome'
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self._current_flags = flags
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self._UpdateCommandLineFile()
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def AddFlags(self, flags):
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"""Appends flags to the command line if they aren't already there.
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Args:
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flags: A list of flags to add on, eg. ['--single-process'].
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"""
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if flags:
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assert flags[0] != 'chrome'
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# Avoid appending flags that are already present.
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for flag in flags:
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if flag not in self._current_flags:
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self._current_flags.append(flag)
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self._UpdateCommandLineFile()
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def RemoveFlags(self, flags):
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"""Removes flags from the command line, if they exist.
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Args:
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flags: A list of flags to remove, eg. ['--single-process']. Note that we
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expect a complete match when removing flags; if you want to remove
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a switch with a value, you must use the exact string used to add
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it in the first place.
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"""
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if flags:
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assert flags[0] != 'chrome'
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for flag in flags:
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if flag in self._current_flags:
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self._current_flags.remove(flag)
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self._UpdateCommandLineFile()
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def Restore(self):
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"""Restores the flags to their original state."""
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self._current_flags = self._TokenizeFlags(self._orig_line)
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self._UpdateCommandLineFile()
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def _UpdateCommandLineFile(self):
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"""Writes out the command line to the file, or removes it if empty."""
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logging.info('Current flags: %s', self._current_flags)
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if self._current_flags:
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self._android_cmd.SetProtectedFileContents(CHROME_COMMAND_FILE,
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'chrome ' +
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' '.join(self._current_flags))
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else:
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self._android_cmd.RunShellCommand('su -c rm ' + CHROME_COMMAND_FILE)
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def _TokenizeFlags(self, line):
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"""Changes the string containing the command line into a list of flags.
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Follows similar logic to CommandLine.java::tokenizeQuotedArguments:
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* Flags are split using whitespace, unless the whitespace is within a
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pair of quotation marks.
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* Unlike the Java version, we keep the quotation marks around switch
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values since we need them to re-create the file when new flags are
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appended.
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Args:
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line: A string containing the entire command line. The first token is
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assumed to be the program name.
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"""
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if not line:
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return []
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tokenized_flags = []
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current_flag = ""
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within_quotations = False
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# Move through the string character by character and build up each flag
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# along the way.
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for c in line.strip():
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if c is '"':
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if len(current_flag) > 0 and current_flag[-1] == '\\':
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# Last char was a backslash; pop it, and treat this " as a literal.
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current_flag = current_flag[0:-1] + '"'
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else:
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within_quotations = not within_quotations
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current_flag += c
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elif not within_quotations and (c is ' ' or c is '\t'):
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if current_flag is not "":
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tokenized_flags.append(current_flag)
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current_flag = ""
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else:
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current_flag += c
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# Tack on the last flag.
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if not current_flag:
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if within_quotations:
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warnings.warn("Unterminated quoted string: " + current_flag)
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else:
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tokenized_flags.append(current_flag)
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# Return everything but the program name.
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return tokenized_flags[1:]
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