Duplicate cache when creating templater.

mercurial/templater.py

@@ -1,240 +1,240
 # templater.py - template expansion for output
 #
 # Copyright 2005, 2006 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
 import re
 from demandload import demandload
 from i18n import gettext as _
 demandload(globals(), "cStringIO cgi sys os time urllib util")
 
 esctable = {
     '\\': '\\',
     'r': '\r',
     't': '\t',
     'n': '\n',
     'v': '\v',
     }
 
 def parsestring(s, quoted=True):
     '''parse a string using simple c-like syntax.
     string must be in quotes if quoted is True.'''
     fp = cStringIO.StringIO()
     if quoted:
         first = s[0]
         if len(s) < 2: raise SyntaxError(_('string too short'))
         if first not in "'\"": raise SyntaxError(_('invalid quote'))
         if s[-1] != first: raise SyntaxError(_('unmatched quotes'))
         s = s[1:-1]
     escape = False
     for c in s:
         if escape:
             fp.write(esctable.get(c, c))
             escape = False
         elif c == '\\': escape = True
         elif quoted and c == first: raise SyntaxError(_('string ends early'))
         else: fp.write(c)
     if escape: raise SyntaxError(_('unterminated escape'))
     return fp.getvalue()
 
 class templater(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 atrings 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, mapfile, filters={}, defaults={}, cache={}):
         '''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
+        self.cache = cache.copy()
         self.map = {}
         self.base = (mapfile and os.path.dirname(mapfile)) or ''
         self.filters = filters
         self.defaults = defaults
 
         if not mapfile:
             return
         i = 0
         for l in file(mapfile):
             l = l.strip()
             i += 1
             if not l or l[0] in '#;': continue
             m = re.match(r'([a-zA-Z_][a-zA-Z0-9_]*)\s*=\s*(.+)$', l)
             if m:
                 key, val = m.groups()
                 if val[0] in "'\"":
                     try:
                         self.cache[key] = parsestring(val)
                     except SyntaxError, inst:
                         raise SyntaxError('%s:%s: %s' %
                                           (mapfile, i, inst.args[0]))
                 else:
                     self.map[key] = os.path.join(self.base, val)
             else:
                 raise SyntaxError(_("%s:%s: parse error") % (mapfile, i))
 
     def __contains__(self, key):
         return key in self.cache
 
     def __call__(self, t, **map):
         '''perform expansion.
         t is name of map element to expand.
         map is added elements to use during expansion.'''
         m = self.defaults.copy()
         m.update(map)
         try:
             tmpl = self.cache[t]
         except KeyError:
             try:
                 tmpl = self.cache[t] = file(self.map[t]).read()
             except IOError, inst:
                 raise IOError(inst.args[0], _('template file %s: %s') %
                               (self.map[t], inst.args[1]))
         return self.template(tmpl, self.filters, **m)
 
     template_re = re.compile(r"[#{]([a-zA-Z_][a-zA-Z0-9_]*)"
                              r"((%[a-zA-Z_][a-zA-Z0-9_]*)*)"
                              r"((\|[a-zA-Z_][a-zA-Z0-9_]*)*)[#}]")
 
     def template(self, tmpl, filters={}, **map):
         lm = map.copy()
         while tmpl:
             m = self.template_re.search(tmpl)
             if m:
                 start, end = m.span(0)
                 s, e = tmpl[start], tmpl[end - 1]
                 key = m.group(1)
                 if ((s == '#' and e != '#') or (s == '{' and e != '}')):
                     raise SyntaxError(_("'%s'/'%s' mismatch expanding '%s'") %
                                       (s, e, key))
                 if start:
                     yield tmpl[:start]
                 v = map.get(key, "")
                 v = callable(v) and v(**map) or v
 
                 format = m.group(2)
                 fl = m.group(4)
 
                 if format:
                     q = v.__iter__
                     for i in q():
                         lm.update(i)
                         yield self(format[1:], **lm)
 
                     v = ""
 
                 elif fl:
                     for f in fl.split("|")[1:]:
                         v = filters[f](v)
 
                 yield v
                 tmpl = tmpl[end:]
             else:
                 yield tmpl
                 break
 
 agescales = [("second", 1),
              ("minute", 60),
              ("hour", 3600),
              ("day", 3600 * 24),
              ("week", 3600 * 24 * 7),
              ("month", 3600 * 24 * 30),
              ("year", 3600 * 24 * 365)]
 
 agescales.reverse()
 
 def age(date):
     '''turn a (timestamp, tzoff) tuple into an age string.'''
 
     def plural(t, c):
         if c == 1:
             return t
         return t + "s"
     def fmt(t, c):
         return "%d %s" % (c, plural(t, c))
 
     now = time.time()
     then = date[0]
     delta = max(1, int(now - then))
 
     for t, s in agescales:
         n = delta / s
         if n >= 2 or s == 1:
             return fmt(t, n)
 
 def isodate(date):
     '''turn a (timestamp, tzoff) tuple into an iso 8631 date.'''
     return util.datestr(date, format='%Y-%m-%d %H:%M')
 
 def nl2br(text):
     '''replace raw newlines with xhtml line breaks.'''
     return text.replace('\n', '<br/>\n')
 
 def obfuscate(text):
     return ''.join(['&#%d;' % ord(c) for c in text])
 
 def domain(author):
     '''get domain of author, or empty string if none.'''
     f = author.find('@')
     if f == -1: return ''
     author = author[f+1:]
     f = author.find('>')
     if f >= 0: author = author[:f]
     return author
 
 def person(author):
     '''get name of author, or else username.'''
     f = author.find('<')
     if f == -1: return util.shortuser(author)
     return author[:f].rstrip()
 
 common_filters = {
     "addbreaks": nl2br,
     "age": age,
     "date": lambda x: util.datestr(x),
     "domain": domain,
     "escape": lambda x: cgi.escape(x, True),
     "firstline": lambda x: x.splitlines(1)[0].rstrip('\r\n'),
     "isodate": isodate,
     "obfuscate": obfuscate,
     "permissions": lambda x: x and "-rwxr-xr-x" or "-rw-r--r--",
     "person": person,
     "rfc822date": lambda x: util.datestr(x, "%a, %d %b %Y %H:%M:%S"),
     "short": lambda x: x[:12],
     "strip": lambda x: x.strip(),
     "urlescape": lambda x: urllib.quote(x),
     "user": lambda x: util.shortuser(x),
     }
 
 def templatepath(name=None):
     '''return location of template file or directory (if no name).
     returns None if not found.'''
     for f in 'templates', '../templates':
         fl = f.split('/')
         if name: fl.append(name)
         p = os.path.join(os.path.dirname(__file__), *fl)
         if (name and os.path.exists(p)) or os.path.isdir(p):
             return os.path.normpath(p)
     else:
         # executable version (py2exe) doesn't support __file__
         if hasattr(sys, 'frozen'):
             return os.path.join(sys.prefix, "templates")