# Copyright (C) 2005 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
# \subsection{\emph{rio} - simple text metaformat}
#
# \emph{r} stands for `restricted', `reproducible', or `rfc822-like'.
#
# The stored data consists of a series of \emph{stanzas}, each of which contains
# \emph{fields} identified by an ascii name, with Unicode or string contents.
# The field tag is constrained to alphanumeric characters.
# There may be more than one field in a stanza with the same name.
#
# The format itself does not deal with character encoding issues, though
# the result will normally be written in Unicode.
#
# The format is intended to be simple enough that there is exactly one character
# stream representation of an object and vice versa, and that this relation
# will continue to hold for future versions of bzr.
import re
from bzrlib import osutils
from bzrlib.iterablefile import IterableFile
# XXX: some redundancy is allowing to write stanzas in isolation as well as
# through a writer object.
class RioWriter(object):
def __init__(self, to_file):
self._soft_nl = False
self._to_file = to_file
def write_stanza(self, stanza):
if self._soft_nl:
self._to_file.write('\n')
stanza.write(self._to_file)
self._soft_nl = True
class RioReader(object):
"""Read stanzas from a file as a sequence
to_file can be anything that can be enumerated as a sequence of
lines (with newlines.)
"""
def __init__(self, from_file):
self._from_file = from_file
def __iter__(self):
while True:
s = read_stanza(self._from_file)
if s is None:
break
else:
yield s
def rio_file(stanzas, header=None):
"""Produce a rio IterableFile from an iterable of stanzas"""
def str_iter():
if header is not None:
yield header + '\n'
first_stanza = True
for s in stanzas:
if first_stanza is not True:
yield '\n'
for line in s.to_lines():
yield line
first_stanza = False
return IterableFile(str_iter())
def read_stanzas(from_file):
while True:
s = read_stanza(from_file)
if s is None:
break
else:
yield s
class Stanza(object):
"""One stanza for rio.
Each stanza contains a set of named fields.
Names must be non-empty ascii alphanumeric plus _. Names can be repeated
within a stanza. Names are case-sensitive. The ordering of fields is
preserved.
Each field value must be either an int or a string.
"""
__slots__ = ['items']
def __init__(self, **kwargs):
"""Construct a new Stanza.
The keyword arguments, if any, are added in sorted order to the stanza.
"""
self.items = []
if kwargs:
for tag, value in sorted(kwargs.items()):
self.add(tag, value)
def add(self, tag, value):
"""Append a name and value to the stanza."""
if not valid_tag(tag):
raise ValueError("invalid tag %r" % (tag,))
if isinstance(value, str):
value = unicode(value)
elif isinstance(value, unicode):
pass
## elif isinstance(value, (int, long)):
## value = str(value) # XXX: python2.4 without L-suffix
else:
raise TypeError("invalid type for rio value: %r of type %s"
% (value, type(value)))
self.items.append((tag, value))
@classmethod
def from_pairs(cls, pairs):
ret = cls()
ret.items = pairs
return ret
def __contains__(self, find_tag):
"""True if there is any field in this stanza with the given tag."""
for tag, value in self.items:
if tag == find_tag:
return True
return False
def __len__(self):
"""Return number of pairs in the stanza."""
return len(self.items)
def __eq__(self, other):
if not isinstance(other, Stanza):
return False
return self.items == other.items
def __ne__(self, other):
return not self.__eq__(other)
def __repr__(self):
return "Stanza(%r)" % self.items
def iter_pairs(self):
"""Return iterator of tag, value pairs."""
return iter(self.items)
def to_lines(self):
"""Generate sequence of lines for external version of this file.
The lines are always utf-8 encoded strings.
"""
if not self.items:
# max() complains if sequence is empty
return []
result = []
for tag, value in self.items:
if value == '':
result.append(tag + ': \n')
elif '\n' in value:
# don't want splitlines behaviour on empty lines
val_lines = value.split('\n')
result.append(tag + ': ' + val_lines[0].encode('utf-8') + '\n')
for line in val_lines[1:]:
result.append('\t' + line.encode('utf-8') + '\n')
else:
result.append(tag + ': ' + value.encode('utf-8') + '\n')
return result
def to_string(self):
"""Return stanza as a single string"""
return ''.join(self.to_lines())
def to_unicode(self):
"""Return stanza as a single Unicode string.
This is most useful when adding a Stanza to a parent Stanza
"""
if not self.items:
return u''
result = []
for tag, value in self.items:
if value == u'':
result.append(tag + u': \n')
elif u'\n' in value:
# don't want splitlines behaviour on empty lines
val_lines = value.split(u'\n')
result.append(tag + u': ' + val_lines[0] + u'\n')
for line in val_lines[1:]:
result.append(u'\t' + line + u'\n')
else:
result.append(tag + u': ' + value + u'\n')
return u''.join(result)
def write(self, to_file):
"""Write stanza to a file"""
to_file.writelines(self.to_lines())
def get(self, tag):
"""Return the value for a field wih given tag.
If there is more than one value, only the first is returned. If the
tag is not present, KeyError is raised.
"""
for t, v in self.items:
if t == tag:
return v
else:
raise KeyError(tag)
__getitem__ = get
def get_all(self, tag):
r = []
for t, v in self.items:
if t == tag:
r.append(v)
return r
def as_dict(self):
"""Return a dict containing the unique values of the stanza.
"""
d = {}
for tag, value in self.items:
d[tag] = value
return d
def valid_tag(tag):
return _valid_tag(tag)
def read_stanza(line_iter):
"""Return new Stanza read from list of lines or a file
Returns one Stanza that was read, or returns None at end of file. If a
blank line follows the stanza, it is consumed. It's not an error for
there to be no blank at end of file. If there is a blank file at the
start of the input this is really an empty stanza and that is returned.
Only the stanza lines and the trailing blank (if any) are consumed
from the line_iter.
The raw lines must be in utf-8 encoding.
"""
return _read_stanza_utf8(line_iter)
def read_stanza_unicode(unicode_iter):
"""Read a Stanza from a list of lines or a file.
The lines should already be in unicode form. This returns a single
stanza that was read. If there is a blank line at the end of the Stanza,
it is consumed. It is not an error for there to be no blank line at
the end of the iterable. If there is a blank line at the beginning,
this is treated as an empty Stanza and None is returned.
Only the stanza lines and the trailing blank (if any) are consumed
from the unicode_iter
:param unicode_iter: A iterable, yeilding Unicode strings. See read_stanza
if you have a utf-8 encoded string.
:return: A Stanza object if there are any lines in the file.
None otherwise
"""
return _read_stanza_unicode(unicode_iter)
def to_patch_lines(stanza, max_width=72):
"""Convert a stanza into RIO-Patch format lines.
RIO-Patch is a RIO variant designed to be e-mailed as part of a patch.
It resists common forms of damage such as newline conversion or the removal
of trailing whitespace, yet is also reasonably easy to read.
:param max_width: The maximum number of characters per physical line.
:return: a list of lines
"""
if max_width <= 6:
raise ValueError(max_width)
max_rio_width = max_width - 4
lines = []
for pline in stanza.to_lines():
for line in pline.split('\n')[:-1]:
line = re.sub('\\\\', '\\\\\\\\', line)
while len(line) > 0:
partline = line[:max_rio_width]
line = line[max_rio_width:]
if len(line) > 0 and line[0] != [' ']:
break_index = -1
break_index = partline.rfind(' ', -20)
if break_index < 3:
break_index = partline.rfind('-', -20)
break_index += 1
if break_index < 3:
break_index = partline.rfind('/', -20)
if break_index >= 3:
line = partline[break_index:] + line
partline = partline[:break_index]
if len(line) > 0:
line = ' ' + line
partline = re.sub('\r', '\\\\r', partline)
blank_line = False
if len(line) > 0:
partline += '\\'
elif re.search(' $', partline):
partline += '\\'
blank_line = True
lines.append('# ' + partline + '\n')
if blank_line:
lines.append('# \n')
return lines
def _patch_stanza_iter(line_iter):
map = {'\\\\': '\\',
'\\r' : '\r',
'\\\n': ''}
def mapget(match):
return map[match.group(0)]
last_line = None
for line in line_iter:
if line.startswith('# '):
line = line[2:]
elif line.startswith('#'):
line = line[1:]
else:
raise ValueError("bad line %r" % (line,))
if last_line is not None and len(line) > 2:
line = line[2:]
line = re.sub('\r', '', line)
line = re.sub('\\\\(.|\n)', mapget, line)
if last_line is None:
last_line = line
else:
last_line += line
if last_line[-1] == '\n':
yield last_line
last_line = None
if last_line is not None:
yield last_line
def read_patch_stanza(line_iter):
"""Convert an iterable of RIO-Patch format lines into a Stanza.
RIO-Patch is a RIO variant designed to be e-mailed as part of a patch.
It resists common forms of damage such as newline conversion or the removal
of trailing whitespace, yet is also reasonably easy to read.
:return: a Stanza
"""
return read_stanza(_patch_stanza_iter(line_iter))
try:
from bzrlib._rio_pyx import (
_read_stanza_utf8,
_read_stanza_unicode,
_valid_tag,
)
except ImportError, e:
osutils.failed_to_load_extension(e)
from bzrlib._rio_py import (
_read_stanza_utf8,
_read_stanza_unicode,
_valid_tag,
)
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