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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# \subsection{\emph{rio} - simple text metaformat}
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# \emph{r} stands for `restricted', `reproducible', or `rfc822-like'.
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# The stored data consists of a series of \emph{stanzas}, each of which contains
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# \emph{fields} identified by an ascii name, with Unicode or string contents.
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# The field tag is constrained to alphanumeric characters.
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# The field tag is constrained to alphanumeric characters.
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# There may be more than one field in a stanza with the same name.
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# The format itself does not deal with character encoding issues, though
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# the result will normally be written in Unicode.
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# The format is intended to be simple enough that there is exactly one character
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# stream representation of an object and vice versa, and that this relation
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# will continue to hold for future versions of bzr.
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from bzrlib import osutils
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from bzrlib.iterablefile import IterableFile
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# XXX: some redundancy is allowing to write stanzas in isolation as well as
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# through a writer object.
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# through a writer object.
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class RioWriter(object):
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def __init__(self, to_file):
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for tag, value in self.items:
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result.append(tag + u': \n')
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result.append(tag + ': \n')
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# don't want splitlines behaviour on empty lines
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val_lines = value.split(u'\n')
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result.append(tag + u': ' + val_lines[0] + u'\n')
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val_lines = value.split('\n')
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result.append(tag + ': ' + val_lines[0] + '\n')
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for line in val_lines[1:]:
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result.append(u'\t' + line + u'\n')
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result.append('\t' + line + '\n')
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result.append(tag + u': ' + value + u'\n')
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result.append(tag + ': ' + value + '\n')
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return u''.join(result)
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def write(self, to_file):
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for tag, value in self.items:
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_tag_re = re.compile(r'^[-a-zA-Z0-9_]+$')
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def valid_tag(tag):
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return _valid_tag(tag)
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return bool(_tag_re.match(tag))
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def read_stanza(line_iter):
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"""Return new Stanza read from list of lines or a file
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Returns one Stanza that was read, or returns None at end of file. If a
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blank line follows the stanza, it is consumed. It's not an error for
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there to be no blank at end of file. If there is a blank file at the
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start of the input this is really an empty stanza and that is returned.
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start of the input this is really an empty stanza and that is returned.
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Only the stanza lines and the trailing blank (if any) are consumed
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from the line_iter.
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The raw lines must be in utf-8 encoding.
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return _read_stanza_utf8(line_iter)
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unicode_iter = (line.decode('utf-8') for line in line_iter)
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return read_stanza_unicode(unicode_iter)
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def read_stanza_unicode(unicode_iter):
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:return: A Stanza object if there are any lines in the file.
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return _read_stanza_unicode(unicode_iter)
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def to_patch_lines(stanza, max_width=72):
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"""Convert a stanza into RIO-Patch format lines.
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RIO-Patch is a RIO variant designed to be e-mailed as part of a patch.
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It resists common forms of damage such as newline conversion or the removal
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of trailing whitespace, yet is also reasonably easy to read.
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:param max_width: The maximum number of characters per physical line.
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:return: a list of lines
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raise ValueError(max_width)
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max_rio_width = max_width - 4
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for pline in stanza.to_lines():
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for line in pline.split('\n')[:-1]:
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line = re.sub('\\\\', '\\\\\\\\', line)
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partline = line[:max_rio_width]
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line = line[max_rio_width:]
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if len(line) > 0 and line[0] != [' ']:
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break_index = partline.rfind(' ', -20)
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break_index = partline.rfind('-', -20)
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break_index = partline.rfind('/', -20)
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line = partline[break_index:] + line
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partline = partline[:break_index]
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partline = re.sub('\r', '\\\\r', partline)
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elif re.search(' $', partline):
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lines.append('# ' + partline + '\n')
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def _patch_stanza_iter(line_iter):
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return map[match.group(0)]
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for line in line_iter:
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if line.startswith('# '):
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elif line.startswith('#'):
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raise ValueError("bad line %r" % (line,))
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if last_line is not None and len(line) > 2:
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line = re.sub('\r', '', line)
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line = re.sub('\\\\(.|\n)', mapget, line)
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if last_line is None:
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if last_line[-1] == '\n':
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if last_line is not None:
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def read_patch_stanza(line_iter):
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"""Convert an iterable of RIO-Patch format lines into a Stanza.
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RIO-Patch is a RIO variant designed to be e-mailed as part of a patch.
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It resists common forms of damage such as newline conversion or the removal
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of trailing whitespace, yet is also reasonably easy to read.
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return read_stanza(_patch_stanza_iter(line_iter))
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from bzrlib._rio_pyx import (
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_read_stanza_unicode,
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except ImportError, e:
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osutils.failed_to_load_extension(e)
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from bzrlib._rio_py import (
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_read_stanza_unicode,
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# TODO: jam 20060922 This code should raise real errors rather than
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# using 'assert' to process user input, or raising ValueError
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# rather than a more specific error.
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for line in unicode_iter:
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if line is None or line == '':
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break # end of stanza
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assert line.endswith('\n')
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if line[0] == '\t': # continues previous value
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raise ValueError('invalid continuation line %r' % real_l)
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accum_value += '\n' + line[1:-1]
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else: # new tag:value line
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stanza.add(tag, accum_value)
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colon_index = line.index(': ')
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raise ValueError('tag/value separator not found in line %r'
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tag = str(line[:colon_index])
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assert valid_tag(tag), \
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"invalid rio tag %r" % tag
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accum_value = line[colon_index+2:-1]
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if tag is not None: # add last tag-value
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stanza.add(tag, accum_value)
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else: # didn't see any content