Source tree reorg, phase 1. Almost everything moved, no file contents changed.

svn path=/branches/tk685/; revision=5757

1 files changed, 112 insertions, 0 deletions

diff --git a/rpki/csv_utils.py b/rpki/csv_utils.py
new file mode 100644
index 00000000..47caabdb
--- /dev/null
+++ b/rpki/csv_utils.py
@@ -0,0 +1,112 @@
+# $Id$
+# 
+# Copyright (C) 2009--2012  Internet Systems Consortium ("ISC")
+# 
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+# AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+# PERFORMANCE OF THIS SOFTWARE.
+
+"""
+CSV utilities, moved here from myrpki.py.
+"""
+
+import csv
+import os
+
+class BadCSVSyntax(Exception):
+  """
+  Bad CSV syntax.
+  """
+
+class csv_reader(object):
+  """
+  Reader for tab-delimited text that's (slightly) friendlier than the
+  stock Python csv module (which isn't intended for direct use by
+  humans anyway, and neither was this package originally, but that
+  seems to be the way that it has evolved...).
+
+  Columns parameter specifies how many columns users of the reader
+  expect to see; lines with fewer columns will be padded with None
+  values.
+
+  Original API design for this class courtesy of Warren Kumari, but
+  don't blame him if you don't like what I did with his ideas.
+  """
+
+  def __init__(self, filename, columns = None, min_columns = None, comment_characters = "#;"):
+    assert columns is None or isinstance(columns, int)
+    assert min_columns is None or isinstance(min_columns, int)
+    if columns is not None and min_columns is None:
+      min_columns = columns
+    self.filename = filename
+    self.columns = columns
+    self.min_columns = min_columns
+    self.comment_characters = comment_characters 
+    self.file = open(filename, "r")
+
+  def __iter__(self):
+    line_number = 0
+    for line in self.file:
+      line_number += 1
+      line = line.strip()
+      if not line or line[0] in self.comment_characters:
+        continue
+      fields = line.split()
+      if self.min_columns is not None and len(fields) < self.min_columns:
+        raise BadCSVSyntax, "%s:%d: Not enough columns in line %r" % (self.filename, line_number, line)
+      if self.columns is not None and len(fields) > self.columns:
+        raise BadCSVSyntax, "%s:%d: Too many  columns in line %r" % (self.filename, line_number, line)
+      if self.columns is not None and len(fields) < self.columns:
+        fields += tuple(None for i in xrange(self.columns - len(fields)))
+      yield fields
+
+  def __enter__(self):
+    return self
+
+  def __exit__(self, _type, value, traceback):
+    self.file.close()
+
+class csv_writer(object):
+  """
+  Writer object for tab delimited text.  We just use the stock CSV
+  module in excel-tab mode for this.
+
+  If "renmwo" is set (default), the file will be written to
+  a temporary name and renamed to the real filename after closing.
+  """
+
+  def __init__(self, filename, renmwo = True):
+    self.filename = filename
+    self.renmwo = "%s.~renmwo%d~" % (filename, os.getpid()) if renmwo else filename
+    self.file = open(self.renmwo, "w")
+    self.writer = csv.writer(self.file, dialect = csv.get_dialect("excel-tab"))
+
+  def __enter__(self):
+    return self
+
+  def __exit__(self, _type, value, traceback):
+    self.close()
+
+  def close(self):
+    """
+    Close this writer.
+    """
+    if self.file is not None:
+      self.file.close()
+      self.file = None
+      if self.filename != self.renmwo:
+        os.rename(self.renmwo, self.filename)
+
+  def __getattr__(self, attr):
+    """
+    Fake inheritance from whatever object csv.writer deigns to give us.
+    """
+    return getattr(self.writer, attr)