break up event-log-tags; generate java source files with constants

Construct the /system/etc/event-log-tags file by unioning together any
*.logtags files included in LOCAL_SRC_FILES throughout the system (with
appropriate error checking for dup tag numbers, etc.)

For java packages, generate a java source file from the logtags file for
that package that contains static integer constants for each tag name.

1 files changed, 112 insertions, 0 deletions

diff --git a/tools/event_log_tags.py b/tools/event_log_tags.py
new file mode 100644
index 0000000..fc05aff
--- /dev/null
+++ b/tools/event_log_tags.py
@@ -0,0 +1,112 @@
+# 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."""
+
+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), 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
+
+        try:
+          tag = int(parts[0])
+        except ValueError:
+          self.AddError("\"%s\" isn't an integer tag" % (parts[0],))
+          continue
+
+        tagname = parts[1]
+        if len(parts) == 3:
+          description = parts[2]
+        else:
+          description = None
+
+        self.tags.append(Tag(tag, tagname, description,
+                             self.filename, self.linenum))
+    except (IOError, OSError), e:
+      self.AddError(str(e))
+
+
+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), e:
+    print >> sys.stderr, "failed to write %s: %s" % (output_file, e)
+    sys.exit(1)