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# config.py - configuration parsing for Mercurial
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#
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# Copyright 2009 Olivia Mackall <olivia@selenic.com> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import annotations
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import errno
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import os
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from typing import (
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List,
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Tuple,
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)
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from .i18n import _
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from . import (
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encoding,
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error,
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util,
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)
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class config:
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def __init__(self, data=None):
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self._current_source_level = 0
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self._data = {}
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self._unset = []
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if data:
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for k in data._data:
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self._data[k] = data[k].copy()
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self._current_source_level = data._current_source_level + 1
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def new_source(self):
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"""increment the source counter
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This is used to define source priority when reading"""
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self._current_source_level += 1
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def copy(self):
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return config(self)
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def __contains__(self, section):
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return section in self._data
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def hasitem(self, section, item):
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return item in self._data.get(section, {})
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def __getitem__(self, section):
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return self._data.get(section, {})
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def __iter__(self):
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for d in self.sections():
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yield d
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def update(self, src):
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current_level = self._current_source_level
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current_level += 1
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max_level = self._current_source_level
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for s, n in src._unset:
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ds = self._data.get(s, None)
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if ds is not None and n in ds:
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self._data[s] = ds.preparewrite()
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del self._data[s][n]
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for s in src:
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ds = self._data.get(s, None)
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if ds:
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self._data[s] = ds.preparewrite()
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else:
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self._data[s] = util.cowsortdict()
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for k, v in src._data[s].items():
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value, source, level = v
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level += current_level
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max_level = max(level, current_level)
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self._data[s][k] = (value, source, level)
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self._current_source_level = max_level
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def _get(self, section, item):
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return self._data.get(section, {}).get(item)
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def get(self, section, item, default=None):
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result = self._get(section, item)
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if result is None:
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return default
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return result[0]
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def backup(self, section, key):
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"""return a tuple allowing restore to reinstall a previous value
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The main reason we need it is because it handles the "no data" case.
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"""
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try:
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item = self._data[section][key]
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except KeyError:
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return (section, key)
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else:
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return (section, key) + item
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def source(self, section, item):
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result = self._get(section, item)
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if result is None:
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return b""
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return result[1]
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def level(self, section, item):
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result = self._get(section, item)
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if result is None:
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return None
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return result[2]
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def sections(self):
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return sorted(self._data.keys())
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def items(self, section: bytes) -> List[Tuple[bytes, bytes]]:
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items = self._data.get(section, {}).items()
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return [(k, v[0]) for (k, v) in items]
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def set(self, section, item, value, source=b""):
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assert not isinstance(
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section, str
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), b'config section may not be unicode strings on Python 3'
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assert not isinstance(
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item, str
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), b'config item may not be unicode strings on Python 3'
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assert not isinstance(
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value, str
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), b'config values may not be unicode strings on Python 3'
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if section not in self:
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self._data[section] = util.cowsortdict()
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else:
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self._data[section] = self._data[section].preparewrite()
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self._data[section][item] = (value, source, self._current_source_level)
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def alter(self, section, key, new_value):
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"""alter a value without altering its source or level
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This method is meant to be used by `ui.fixconfig` only."""
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item = self._data[section][key]
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size = len(item)
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new_item = (new_value,) + item[1:]
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assert len(new_item) == size
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self._data[section][key] = new_item
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def restore(self, data):
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"""restore data returned by self.backup"""
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if len(data) != 2:
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# restore old data
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section, key = data[:2]
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item = data[2:]
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self._data[section] = self._data[section].preparewrite()
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self._data[section][key] = item
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else:
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# no data before, remove everything
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section, item = data
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if section in self._data:
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self._data[section].pop(item, None)
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def parse(self, src, data, sections=None, remap=None, include=None):
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sectionre = util.re.compile(br'\[([^\[]+)\]')
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itemre = util.re.compile(br'([^=\s][^=]*?)\s*=\s*(.*\S|)')
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contre = util.re.compile(br'\s+(\S|\S.*\S)\s*$')
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emptyre = util.re.compile(br'(;|#|\s*$)')
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commentre = util.re.compile(br'(;|#)')
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unsetre = util.re.compile(br'%unset\s+(\S+)')
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includere = util.re.compile(br'%include\s+(\S|\S.*\S)\s*$')
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section = b""
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item = None
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line = 0
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cont = False
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if remap:
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section = remap.get(section, section)
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for l in data.splitlines(True):
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line += 1
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if line == 1 and l.startswith(b'\xef\xbb\xbf'):
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# Someone set us up the BOM
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l = l[3:]
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if cont:
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if commentre.match(l):
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continue
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m = contre.match(l)
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if m:
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if sections and section not in sections:
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continue
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v = self.get(section, item) + b"\n" + m.group(1)
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self.set(section, item, v, b"%s:%d" % (src, line))
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continue
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item = None
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cont = False
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m = includere.match(l)
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if m and include:
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expanded = util.expandpath(m.group(1))
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try:
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include(expanded, remap=remap, sections=sections)
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except IOError as inst:
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if inst.errno != errno.ENOENT:
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raise error.ConfigError(
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_(b"cannot include %s (%s)")
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% (expanded, encoding.strtolocal(inst.strerror)),
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b"%s:%d" % (src, line),
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)
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continue
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if emptyre.match(l):
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continue
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m = sectionre.match(l)
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if m:
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section = m.group(1)
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if remap:
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section = remap.get(section, section)
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if section not in self:
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self._data[section] = util.cowsortdict()
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continue
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m = itemre.match(l)
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if m:
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item = m.group(1)
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cont = True
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if sections and section not in sections:
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continue
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self.set(section, item, m.group(2), b"%s:%d" % (src, line))
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continue
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m = unsetre.match(l)
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if m:
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name = m.group(1)
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if sections and section not in sections:
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continue
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if self.get(section, name) is not None:
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self._data[section] = self._data[section].preparewrite()
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del self._data[section][name]
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self._unset.append((section, name))
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continue
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message = l.rstrip()
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if l.startswith(b' '):
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message = b"unexpected leading whitespace: %s" % message
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raise error.ConfigError(message, (b"%s:%d" % (src, line)))
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def read(self, path, fp=None, sections=None, remap=None):
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self.new_source()
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if not fp:
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fp = util.posixfile(path, b'rb')
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assert (
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getattr(fp, 'mode', 'rb') == 'rb'
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), b'config files must be opened in binary mode, got fp=%r mode=%r' % (
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fp,
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fp.mode,
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)
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dir = os.path.dirname(path)
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def include(rel, remap, sections):
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abs = os.path.normpath(os.path.join(dir, rel))
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self.read(abs, remap=remap, sections=sections)
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# anything after the include has a higher level
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self.new_source()
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self.parse(
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path, fp.read(), sections=sections, remap=remap, include=include
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)
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