simplemerge: avoid quadratic concatenation when building output text
I haven't checked if the difference is measurable, but the new version
is no less readable or idiomatic, so I don't think performance numbers
are needed.
Differential Revision: https://phab.mercurial-scm.org/D9549
# config.py - configuration parsing for Mercurial
#
# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import
import errno
import os
from .i18n import _
from .pycompat import getattr
from . import (
encoding,
error,
pycompat,
util,
)
class config(object):
def __init__(self, data=None):
self._data = {}
self._unset = []
if data:
for k in data._data:
self._data[k] = data[k].copy()
self._source = data._source.copy()
else:
self._source = util.cowdict()
def copy(self):
return config(self)
def __contains__(self, section):
return section in self._data
def hasitem(self, section, item):
return item in self._data.get(section, {})
def __getitem__(self, section):
return self._data.get(section, {})
def __iter__(self):
for d in self.sections():
yield d
def update(self, src):
self._source = self._source.preparewrite()
for s, n in src._unset:
ds = self._data.get(s, None)
if ds is not None and n in ds:
self._data[s] = ds.preparewrite()
del self._data[s][n]
del self._source[(s, n)]
for s in src:
ds = self._data.get(s, None)
if ds:
self._data[s] = ds.preparewrite()
else:
self._data[s] = util.cowsortdict()
self._data[s].update(src._data[s])
self._source.update(src._source)
def get(self, section, item, default=None):
return self._data.get(section, {}).get(item, default)
def backup(self, section, item):
"""return a tuple allowing restore to reinstall a previous value
The main reason we need it is because it handles the "no data" case.
"""
try:
value = self._data[section][item]
source = self.source(section, item)
return (section, item, value, source)
except KeyError:
return (section, item)
def source(self, section, item):
return self._source.get((section, item), b"")
def sections(self):
return sorted(self._data.keys())
def items(self, section):
return list(pycompat.iteritems(self._data.get(section, {})))
def set(self, section, item, value, source=b""):
if pycompat.ispy3:
assert not isinstance(
section, str
), b'config section may not be unicode strings on Python 3'
assert not isinstance(
item, str
), b'config item may not be unicode strings on Python 3'
assert not isinstance(
value, str
), b'config values may not be unicode strings on Python 3'
if section not in self:
self._data[section] = util.cowsortdict()
else:
self._data[section] = self._data[section].preparewrite()
self._data[section][item] = value
if source:
self._source = self._source.preparewrite()
self._source[(section, item)] = source
def restore(self, data):
"""restore data returned by self.backup"""
self._source = self._source.preparewrite()
if len(data) == 4:
# restore old data
section, item, value, source = data
self._data[section] = self._data[section].preparewrite()
self._data[section][item] = value
self._source[(section, item)] = source
else:
# no data before, remove everything
section, item = data
if section in self._data:
self._data[section].pop(item, None)
self._source.pop((section, item), None)
def parse(self, src, data, sections=None, remap=None, include=None):
sectionre = util.re.compile(br'\[([^\[]+)\]')
itemre = util.re.compile(br'([^=\s][^=]*?)\s*=\s*(.*\S|)')
contre = util.re.compile(br'\s+(\S|\S.*\S)\s*$')
emptyre = util.re.compile(br'(;|#|\s*$)')
commentre = util.re.compile(br'(;|#)')
unsetre = util.re.compile(br'%unset\s+(\S+)')
includere = util.re.compile(br'%include\s+(\S|\S.*\S)\s*$')
section = b""
item = None
line = 0
cont = False
if remap:
section = remap.get(section, section)
for l in data.splitlines(True):
line += 1
if line == 1 and l.startswith(b'\xef\xbb\xbf'):
# Someone set us up the BOM
l = l[3:]
if cont:
if commentre.match(l):
continue
m = contre.match(l)
if m:
if sections and section not in sections:
continue
v = self.get(section, item) + b"\n" + m.group(1)
self.set(section, item, v, b"%s:%d" % (src, line))
continue
item = None
cont = False
m = includere.match(l)
if m and include:
expanded = util.expandpath(m.group(1))
try:
include(expanded, remap=remap, sections=sections)
except IOError as inst:
if inst.errno != errno.ENOENT:
raise error.ConfigError(
_(b"cannot include %s (%s)")
% (expanded, encoding.strtolocal(inst.strerror)),
b"%s:%d" % (src, line),
)
continue
if emptyre.match(l):
continue
m = sectionre.match(l)
if m:
section = m.group(1)
if remap:
section = remap.get(section, section)
if section not in self:
self._data[section] = util.cowsortdict()
continue
m = itemre.match(l)
if m:
item = m.group(1)
cont = True
if sections and section not in sections:
continue
self.set(section, item, m.group(2), b"%s:%d" % (src, line))
continue
m = unsetre.match(l)
if m:
name = m.group(1)
if sections and section not in sections:
continue
if self.get(section, name) is not None:
self._data[section] = self._data[section].preparewrite()
del self._data[section][name]
self._unset.append((section, name))
continue
message = l.rstrip()
if l.startswith(b' '):
message = b"unexpected leading whitespace: %s" % message
raise error.ConfigError(message, (b"%s:%d" % (src, line)))
def read(self, path, fp=None, sections=None, remap=None):
if not fp:
fp = util.posixfile(path, b'rb')
assert (
getattr(fp, 'mode', 'rb') == 'rb'
), b'config files must be opened in binary mode, got fp=%r mode=%r' % (
fp,
fp.mode,
)
dir = os.path.dirname(path)
def include(rel, remap, sections):
abs = os.path.normpath(os.path.join(dir, rel))
self.read(abs, remap=remap, sections=sections)
self.parse(
path, fp.read(), sections=sections, remap=remap, include=include
)
def parselist(value):
"""parse a configuration value as a list of comma/space separated strings
>>> parselist(b'this,is "a small" ,test')
['this', 'is', 'a small', 'test']
"""
def _parse_plain(parts, s, offset):
whitespace = False
while offset < len(s) and (
s[offset : offset + 1].isspace() or s[offset : offset + 1] == b','
):
whitespace = True
offset += 1
if offset >= len(s):
return None, parts, offset
if whitespace:
parts.append(b'')
if s[offset : offset + 1] == b'"' and not parts[-1]:
return _parse_quote, parts, offset + 1
elif s[offset : offset + 1] == b'"' and parts[-1][-1:] == b'\\':
parts[-1] = parts[-1][:-1] + s[offset : offset + 1]
return _parse_plain, parts, offset + 1
parts[-1] += s[offset : offset + 1]
return _parse_plain, parts, offset + 1
def _parse_quote(parts, s, offset):
if offset < len(s) and s[offset : offset + 1] == b'"': # ""
parts.append(b'')
offset += 1
while offset < len(s) and (
s[offset : offset + 1].isspace()
or s[offset : offset + 1] == b','
):
offset += 1
return _parse_plain, parts, offset
while offset < len(s) and s[offset : offset + 1] != b'"':
if (
s[offset : offset + 1] == b'\\'
and offset + 1 < len(s)
and s[offset + 1 : offset + 2] == b'"'
):
offset += 1
parts[-1] += b'"'
else:
parts[-1] += s[offset : offset + 1]
offset += 1
if offset >= len(s):
real_parts = _configlist(parts[-1])
if not real_parts:
parts[-1] = b'"'
else:
real_parts[0] = b'"' + real_parts[0]
parts = parts[:-1]
parts.extend(real_parts)
return None, parts, offset
offset += 1
while offset < len(s) and s[offset : offset + 1] in [b' ', b',']:
offset += 1
if offset < len(s):
if offset + 1 == len(s) and s[offset : offset + 1] == b'"':
parts[-1] += b'"'
offset += 1
else:
parts.append(b'')
else:
return None, parts, offset
return _parse_plain, parts, offset
def _configlist(s):
s = s.rstrip(b' ,')
if not s:
return []
parser, parts, offset = _parse_plain, [b''], 0
while parser:
parser, parts, offset = parser(parts, s, offset)
return parts
if value is not None and isinstance(value, bytes):
result = _configlist(value.lstrip(b' ,\n'))
else:
result = value
return result or []