Mercurial > hg
view mercurial/templater.py @ 12296:d7fff529d85d
clone: only use stream when we understand the revlog format
This patch fixes issues with stream cloning in the presense of parentdelta,
lwcopy and similar additions that change the interpretation of the revlog
format, or the format itself.
Currently, the stream capability is sent like this:
stream=<version of changelog>
But the client doesn't actually check the version number; also, it only checks
the changelog and it doesn't capture the interpretation-changes and
flag-changes in parentdelta and lwcopy.
This patch removes the 'stream' capability whenever we use a non-basic revlog
format, to prevent old clients from receiving incorrect data. In those cases,
a new capability called 'streamreqs' is added instead. Instead of a revlog
version, it comes with a list of revlog-format relevant requirements, which
are a subset of the repository requirements, excluding things that are not
relevant for stream.
New clients use this to determine whether or not they can stream. Old clients
only look for the 'stream' capability, as always. New servers will still send
this when serving old repositories.
author | Sune Foldager <cryo@cyanite.org> |
---|---|
date | Wed, 15 Sep 2010 11:06:22 +0200 |
parents | d4cafcb63f77 |
children | b014f998959d |
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# templater.py - template expansion for output # # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. from i18n import _ import sys, os import util, config, templatefilters path = ['templates', '../templates'] stringify = templatefilters.stringify def _flatten(thing): '''yield a single stream from a possibly nested set of iterators''' if isinstance(thing, str): yield thing elif not hasattr(thing, '__iter__'): if thing is not None: yield str(thing) else: for i in thing: if isinstance(i, str): yield i elif not hasattr(i, '__iter__'): if i is not None: yield str(i) elif i is not None: for j in _flatten(i): yield j def parsestring(s, quoted=True): '''parse a string using simple c-like syntax. string must be in quotes if quoted is True.''' if quoted: if len(s) < 2 or s[0] != s[-1]: raise SyntaxError(_('unmatched quotes')) return s[1:-1].decode('string_escape') return s.decode('string_escape') class engine(object): '''template expansion engine. template expansion works like this. a map file contains key=value pairs. if value is quoted, it is treated as string. otherwise, it is treated as name of template file. templater is asked to expand a key in map. it looks up key, and looks for strings like this: {foo}. it expands {foo} by looking up foo in map, and substituting it. expansion is recursive: it stops when there is no more {foo} to replace. expansion also allows formatting and filtering. format uses key to expand each item in list. syntax is {key%format}. filter uses function to transform value. syntax is {key|filter1|filter2|...}.''' def __init__(self, loader, filters={}, defaults={}): self._loader = loader self._filters = filters self._defaults = defaults self._cache = {} def process(self, t, mapping): '''Perform expansion. t is name of map element to expand. mapping contains added elements for use during expansion. Is a generator.''' return _flatten(self._process(self._load(t), mapping)) def _load(self, t): '''load, parse, and cache a template''' if t not in self._cache: self._cache[t] = self._parse(self._loader(t)) return self._cache[t] def _get(self, mapping, key): v = mapping.get(key) if v is None: v = self._defaults.get(key, '') if hasattr(v, '__call__'): v = v(**mapping) return v def _filter(self, mapping, parts): filters, val = parts x = self._get(mapping, val) for f in filters: x = f(x) return x def _format(self, mapping, args): key, parsed = args v = self._get(mapping, key) if not hasattr(v, '__iter__'): raise SyntaxError(_("error expanding '%s%%%s'") % (key, format)) lm = mapping.copy() for i in v: if isinstance(i, dict): lm.update(i) yield self._process(parsed, lm) else: # v is not an iterable of dicts, this happen when 'key' # has been fully expanded already and format is useless. # If so, return the expanded value. yield i def _parse(self, tmpl): '''preparse a template''' parsed = [] pos, stop = 0, len(tmpl) while pos < stop: n = tmpl.find('{', pos) if n < 0: parsed.append((None, tmpl[pos:stop])) break if n > 0 and tmpl[n - 1] == '\\': # escaped parsed.append((None, tmpl[pos:n - 1] + "{")) pos = n + 1 continue if n > pos: parsed.append((None, tmpl[pos:n])) pos = n n = tmpl.find('}', pos) if n < 0: # no closing parsed.append((None, tmpl[pos:stop])) break expr = tmpl[pos + 1:n] pos = n + 1 if '%' in expr: key, t = expr.split('%') parsed.append((self._format, (key.strip(), self._load(t.strip())))) elif '|' in expr: parts = expr.split('|') val = parts[0].strip() try: filters = [self._filters[f.strip()] for f in parts[1:]] except KeyError, i: raise SyntaxError(_("unknown filter '%s'") % i[0]) parsed.append((self._filter, (filters, val))) else: parsed.append((self._get, expr.strip())) return parsed def _process(self, parsed, mapping): '''Render a template. Returns a generator.''' for f, e in parsed: if f: yield f(mapping, e) else: yield e engines = {'default': engine} class templater(object): def __init__(self, mapfile, filters={}, defaults={}, cache={}, minchunk=1024, maxchunk=65536): '''set up template engine. mapfile is name of file to read map definitions from. filters is dict of functions. each transforms a value into another. defaults is dict of default map definitions.''' self.mapfile = mapfile or 'template' self.cache = cache.copy() self.map = {} self.base = (mapfile and os.path.dirname(mapfile)) or '' self.filters = templatefilters.filters.copy() self.filters.update(filters) self.defaults = defaults self.minchunk, self.maxchunk = minchunk, maxchunk self.engines = {} if not mapfile: return if not os.path.exists(mapfile): raise util.Abort(_('style not found: %s') % mapfile) conf = config.config() conf.read(mapfile) for key, val in conf[''].items(): if val[0] in "'\"": try: self.cache[key] = parsestring(val) except SyntaxError, inst: raise SyntaxError('%s: %s' % (conf.source('', key), inst.args[0])) else: val = 'default', val if ':' in val[1]: val = val[1].split(':', 1) self.map[key] = val[0], os.path.join(self.base, val[1]) def __contains__(self, key): return key in self.cache or key in self.map def load(self, t): '''Get the template for the given template name. Use a local cache.''' if not t in self.cache: try: self.cache[t] = open(self.map[t][1]).read() except IOError, inst: raise IOError(inst.args[0], _('template file %s: %s') % (self.map[t][1], inst.args[1])) return self.cache[t] def __call__(self, t, **mapping): ttype = t in self.map and self.map[t][0] or 'default' proc = self.engines.get(ttype) if proc is None: proc = engines[ttype](self.load, self.filters, self.defaults) self.engines[ttype] = proc stream = proc.process(t, mapping) if self.minchunk: stream = util.increasingchunks(stream, min=self.minchunk, max=self.maxchunk) return stream def templatepath(name=None): '''return location of template file or directory (if no name). returns None if not found.''' normpaths = [] # executable version (py2exe) doesn't support __file__ if hasattr(sys, 'frozen'): module = sys.executable else: module = __file__ for f in path: if f.startswith('/'): p = f else: fl = f.split('/') p = os.path.join(os.path.dirname(module), *fl) if name: p = os.path.join(p, name) if name and os.path.exists(p): return os.path.normpath(p) elif os.path.isdir(p): normpaths.append(os.path.normpath(p)) return normpaths def stylemap(styles, paths=None): """Return path to mapfile for a given style. Searches mapfile in the following locations: 1. templatepath/style/map 2. templatepath/map-style 3. templatepath/map """ if paths is None: paths = templatepath() elif isinstance(paths, str): paths = [paths] if isinstance(styles, str): styles = [styles] for style in styles: if not style: continue locations = [os.path.join(style, 'map'), 'map-' + style] locations.append('map') for path in paths: for location in locations: mapfile = os.path.join(path, location) if os.path.isfile(mapfile): return style, mapfile raise RuntimeError("No hgweb templates found in %r" % paths)