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# templater.py - template expansion for output
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#
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# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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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 i18n import _
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import re, sys, os
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import util, config, templatefilters
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path = ['templates', '../templates']
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stringify = templatefilters.stringify
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def parsestring(s, quoted=True):
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'''parse a string using simple c-like syntax.
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string must be in quotes if quoted is True.'''
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if quoted:
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if len(s) < 2 or s[0] != s[-1]:
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raise SyntaxError(_('unmatched quotes'))
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return s[1:-1].decode('string_escape')
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return s.decode('string_escape')
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class engine(object):
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'''template expansion engine.
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template expansion works like this. a map file contains key=value
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pairs. if value is quoted, it is treated as string. otherwise, it
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is treated as name of template file.
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templater is asked to expand a key in map. it looks up key, and
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looks for strings like this: {foo}. it expands {foo} by looking up
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foo in map, and substituting it. expansion is recursive: it stops
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when there is no more {foo} to replace.
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expansion also allows formatting and filtering.
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format uses key to expand each item in list. syntax is
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{key%format}.
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filter uses function to transform value. syntax is
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{key|filter1|filter2|...}.'''
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template_re = re.compile(r'{([\w\|%]+)}')
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def __init__(self, loader, filters={}, defaults={}):
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self.loader = loader
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self.filters = filters
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self.defaults = defaults
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self.cache = {}
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def process(self, t, map):
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'''Perform expansion. t is name of map element to expand. map contains
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added elements for use during expansion. Is a generator.'''
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tmpl = self.loader(t)
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iters = [self._process(tmpl, map)]
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while iters:
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try:
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item = iters[0].next()
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except StopIteration:
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iters.pop(0)
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continue
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if isinstance(item, str):
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yield item
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elif item is None:
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yield ''
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elif hasattr(item, '__iter__'):
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iters.insert(0, iter(item))
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else:
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yield str(item)
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def _format(self, expr, get, map):
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key, format = expr.split('%')
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v = get(key)
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if not hasattr(v, '__iter__'):
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raise SyntaxError(_("error expanding '%s%%%s'") % (key, format))
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lm = map.copy()
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for i in v:
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if isinstance(i, dict):
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lm.update(i)
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yield self.process(format, lm)
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else:
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# v is not an iterable of dicts, this happen when 'key'
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# has been fully expanded already and format is useless.
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# If so, return the expanded value.
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yield i
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def _filter(self, expr, get, map):
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if expr not in self.cache:
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parts = expr.split('|')
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val = parts[0]
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try:
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filters = [self.filters[f] for f in parts[1:]]
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except KeyError, i:
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raise SyntaxError(_("unknown filter '%s'") % i[0])
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def apply(get):
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x = get(val)
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for f in filters:
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x = f(x)
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return x
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self.cache[expr] = apply
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return self.cache[expr](get)
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def _process(self, tmpl, map):
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'''Render a template. Returns a generator.'''
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def get(key):
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v = map.get(key)
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if v is None:
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v = self.defaults.get(key, '')
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if hasattr(v, '__call__'):
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v = v(**map)
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return v
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while tmpl:
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m = self.template_re.search(tmpl)
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if not m:
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yield tmpl
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break
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start, end = m.span(0)
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variants = m.groups()
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expr = variants[0] or variants[1]
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if start:
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yield tmpl[:start]
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tmpl = tmpl[end:]
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if '%' in expr:
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yield self._format(expr, get, map)
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elif '|' in expr:
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yield self._filter(expr, get, map)
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else:
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yield get(expr)
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engines = {'default': engine}
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class templater(object):
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def __init__(self, mapfile, filters={}, defaults={}, cache={},
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minchunk=1024, maxchunk=65536):
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'''set up template engine.
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mapfile is name of file to read map definitions from.
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filters is dict of functions. each transforms a value into another.
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defaults is dict of default map definitions.'''
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self.mapfile = mapfile or 'template'
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self.cache = cache.copy()
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self.map = {}
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self.base = (mapfile and os.path.dirname(mapfile)) or ''
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self.filters = templatefilters.filters.copy()
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self.filters.update(filters)
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self.defaults = defaults
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self.minchunk, self.maxchunk = minchunk, maxchunk
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self.engines = {}
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if not mapfile:
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return
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if not os.path.exists(mapfile):
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raise util.Abort(_('style not found: %s') % mapfile)
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conf = config.config()
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conf.read(mapfile)
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for key, val in conf[''].items():
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if val[0] in "'\"":
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try:
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self.cache[key] = parsestring(val)
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except SyntaxError, inst:
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raise SyntaxError('%s: %s' %
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(conf.source('', key), inst.args[0]))
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else:
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val = 'default', val
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if ':' in val[1]:
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val = val[1].split(':', 1)
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self.map[key] = val[0], os.path.join(self.base, val[1])
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def __contains__(self, key):
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return key in self.cache or key in self.map
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def load(self, t):
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'''Get the template for the given template name. Use a local cache.'''
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if not t in self.cache:
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try:
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self.cache[t] = open(self.map[t][1]).read()
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except IOError, inst:
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raise IOError(inst.args[0], _('template file %s: %s') %
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(self.map[t][1], inst.args[1]))
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return self.cache[t]
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def __call__(self, t, **map):
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ttype = t in self.map and self.map[t][0] or 'default'
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proc = self.engines.get(ttype)
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if proc is None:
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proc = engines[ttype](self.load, self.filters, self.defaults)
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self.engines[ttype] = proc
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stream = proc.process(t, map)
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if self.minchunk:
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stream = util.increasingchunks(stream, min=self.minchunk,
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max=self.maxchunk)
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return stream
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def templatepath(name=None):
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'''return location of template file or directory (if no name).
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returns None if not found.'''
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normpaths = []
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# executable version (py2exe) doesn't support __file__
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if hasattr(sys, 'frozen'):
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module = sys.executable
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else:
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module = __file__
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for f in path:
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if f.startswith('/'):
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p = f
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else:
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fl = f.split('/')
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p = os.path.join(os.path.dirname(module), *fl)
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if name:
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p = os.path.join(p, name)
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if name and os.path.exists(p):
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return os.path.normpath(p)
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elif os.path.isdir(p):
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normpaths.append(os.path.normpath(p))
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return normpaths
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def stylemap(styles, paths=None):
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"""Return path to mapfile for a given style.
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Searches mapfile in the following locations:
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1. templatepath/style/map
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2. templatepath/map-style
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3. templatepath/map
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"""
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if paths is None:
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paths = templatepath()
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elif isinstance(paths, str):
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paths = [paths]
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if isinstance(styles, str):
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styles = [styles]
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for style in styles:
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if not style:
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continue
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locations = [os.path.join(style, 'map'), 'map-' + style]
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locations.append('map')
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for path in paths:
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for location in locations:
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mapfile = os.path.join(path, location)
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if os.path.isfile(mapfile):
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return style, mapfile
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raise RuntimeError("No hgweb templates found in %r" % paths)
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