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templater: preparse templates and cache

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This breaks templates down into a list of literal and {} groups, with
group types preidentified.
This commit is contained in:
Matt Mackall 2010-04-05 15:25:08 -05:00
parent 00f3284ee7
commit cefead81fd
1 changed files with 53 additions and 33 deletions
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86
mercurial/templater.py
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@ -47,12 +47,16 @@ class engine(object):
self.filters = filters
self.defaults = defaults
self.cache = {}
self.parsecache = {}
def process(self, t, map):
'''Perform expansion. t is name of map element to expand. map contains
added elements for use during expansion. Is a generator.'''
tmpl = self.loader(t)
iters = [self._process(tmpl, map)]
if t not in self.parsecache:
tmpl = self.loader(t)
self.parsecache[t] = self._parse(tmpl)
parsed = self.parsecache[t]
iters = [self._process(parsed, map)]
while iters:
try:
item = iters[0].next()
@ -100,7 +104,44 @@ class engine(object):
self.cache[expr] = apply
return self.cache[expr](get)
def _process(self, tmpl, map):
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(('', tmpl[pos:stop]))
break
if n > 0 and tmpl[n - 1] == '\\':
# escaped
parsed.append(('', tmpl[pos:n + 1]))
pos = n + 1
continue
if n > pos:
parsed.append(('', tmpl[pos:n]))
pos = n
n = tmpl.find('}', pos)
if n < 0:
# no closing
parsed.append(('', tmpl[pos:stop]))
break
expr = tmpl[pos + 1:n]
pos = n + 1
if '%' in expr:
parsed.append(('%', expr))
elif '|' in expr:
parsed.append(('|', expr))
else:
parsed.append(('g', expr))
return parsed
def _process(self, parsed, map):
'''Render a template. Returns a generator.'''
def get(key):
@ -111,36 +152,15 @@ class engine(object):
v = v(**map)
return v
pos, stop = 0, len(tmpl)
while pos < stop:
n = tmpl.find('{', pos)
if n < 0:
yield tmpl[pos:stop]
break
if n > 0 and tmpl[n - 1] == '\\':
# escaped
yield tmpl[pos:n + 1]
pos = n + 1
continue
if n > pos:
yield tmpl[pos:n]
pos = n
n = tmpl.find('}', pos)
if n < 0:
# no closing
yield tmpl[pos:stop]
break
expr = tmpl[pos + 1:n]
pos = n + 1
if '%' in expr:
yield self._format(expr, get, map)
elif '|' in expr:
yield self._filter(expr, get, map)
else:
yield get(expr)
for t, e in parsed:
if not t:
yield e
elif t is '|':
yield self._filter(e, get, map)
elif t is '%':
yield self._format(e, get, map)
elif t is 'g':
yield get(e)
engines = {'default': engine}