# Copyright (c) 2009, Google Inc. All rights reserved.

# Copyright (c) 2009 Apple Inc. All rights reserved.

# 

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are

# met:

# 

#     * Redistributions of source code must retain the above copyright

# notice, this list of conditions and the following disclaimer.

#     * Redistributions in binary form must reproduce the above

# copyright notice, this list of conditions and the following disclaimer

# in the documentation and/or other materials provided with the

# distribution.

#     * Neither the name of Google Inc. nor the names of its

# contributors may be used to endorse or promote products derived from

# this software without specific prior written permission.

# 

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

# WebKit's Python module for logging

# This module is now deprecated in favor of python's built-in logging.py.

import codecs

import os

import sys

def log(string):

    print >> sys.stderr, string

def error(string):

    log("ERROR: %s" % string)

    exit(1)

# Simple class to split output between multiple destinations

class tee:

    def __init__(self, *files):

        self.files = files

    # Callers should pass an already encoded string for writing.

    def write(self, bytes):

        for file in self.files:

            file.write(bytes)

class OutputTee:

    def __init__(self):

        self._original_stdout = None

        self._original_stderr = None

        self._files_for_output = []

    def add_log(self, path):

        log_file = self._open_log_file(path)

        self._files_for_output.append(log_file)

        self._tee_outputs_to_files(self._files_for_output)

        return log_file

    def remove_log(self, log_file):

        self._files_for_output.remove(log_file)

        self._tee_outputs_to_files(self._files_for_output)

        log_file.close()

    @staticmethod

    def _open_log_file(log_path):

        (log_directory, log_name) = os.path.split(log_path)

        if log_directory and not os.path.exists(log_directory):

            os.makedirs(log_directory)

        return codecs.open(log_path, "a+", "utf-8")

    def _tee_outputs_to_files(self, files):

        if not self._original_stdout:

            self._original_stdout = sys.stdout

            self._original_stderr = sys.stderr

        if files and len(files):

            sys.stdout = tee(self._original_stdout, *files)

            sys.stderr = tee(self._original_stderr, *files)

        else:

            sys.stdout = self._original_stdout

            sys.stderr = self._original_stderr