|
|
# 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, parser, error
|
|
|
|
|
|
# template parsing
|
|
|
|
|
|
elements = {
|
|
|
"(": (20, ("group", 1, ")"), ("func", 1, ")")),
|
|
|
",": (2, None, ("list", 2)),
|
|
|
"|": (5, None, ("|", 5)),
|
|
|
"%": (6, None, ("%", 6)),
|
|
|
")": (0, None, None),
|
|
|
"symbol": (0, ("symbol",), None),
|
|
|
"string": (0, ("string",), None),
|
|
|
"end": (0, None, None),
|
|
|
}
|
|
|
|
|
|
def tokenizer(data):
|
|
|
program, start, end = data
|
|
|
pos = start
|
|
|
while pos < end:
|
|
|
c = program[pos]
|
|
|
if c.isspace(): # skip inter-token whitespace
|
|
|
pass
|
|
|
elif c in "(,)%|": # handle simple operators
|
|
|
yield (c, None, pos)
|
|
|
elif (c in '"\'' or c == 'r' and
|
|
|
program[pos:pos + 2] in ("r'", 'r"')): # handle quoted strings
|
|
|
if c == 'r':
|
|
|
pos += 1
|
|
|
c = program[pos]
|
|
|
decode = lambda x: x
|
|
|
else:
|
|
|
decode = lambda x: x.decode('string-escape')
|
|
|
pos += 1
|
|
|
s = pos
|
|
|
while pos < end: # find closing quote
|
|
|
d = program[pos]
|
|
|
if d == '\\': # skip over escaped characters
|
|
|
pos += 2
|
|
|
continue
|
|
|
if d == c:
|
|
|
yield ('string', decode(program[s:pos]), s)
|
|
|
break
|
|
|
pos += 1
|
|
|
else:
|
|
|
raise error.ParseError(_("unterminated string"), s)
|
|
|
elif c.isalnum() or c in '_':
|
|
|
s = pos
|
|
|
pos += 1
|
|
|
while pos < end: # find end of symbol
|
|
|
d = program[pos]
|
|
|
if not (d.isalnum() or d == "_"):
|
|
|
break
|
|
|
pos += 1
|
|
|
sym = program[s:pos]
|
|
|
yield ('symbol', sym, s)
|
|
|
pos -= 1
|
|
|
elif c == '}':
|
|
|
pos += 1
|
|
|
break
|
|
|
else:
|
|
|
raise error.ParseError(_("syntax error"), pos)
|
|
|
pos += 1
|
|
|
data[2] = pos
|
|
|
yield ('end', None, pos)
|
|
|
|
|
|
def compiletemplate(tmpl, context):
|
|
|
parsed = []
|
|
|
pos, stop = 0, len(tmpl)
|
|
|
p = parser.parser(tokenizer, elements)
|
|
|
|
|
|
while pos < stop:
|
|
|
n = tmpl.find('{', pos)
|
|
|
if n < 0:
|
|
|
parsed.append(("string", tmpl[pos:]))
|
|
|
break
|
|
|
if n > 0 and tmpl[n - 1] == '\\':
|
|
|
# escaped
|
|
|
parsed.append(("string", tmpl[pos:n - 1] + "{"))
|
|
|
pos = n + 1
|
|
|
continue
|
|
|
if n > pos:
|
|
|
parsed.append(("string", tmpl[pos:n]))
|
|
|
|
|
|
pd = [tmpl, n + 1, stop]
|
|
|
parsed.append(p.parse(pd))
|
|
|
pos = pd[2]
|
|
|
|
|
|
return [compileexp(e, context) for e in parsed]
|
|
|
|
|
|
def compileexp(exp, context):
|
|
|
t = exp[0]
|
|
|
if t in methods:
|
|
|
return methods[t](exp, context)
|
|
|
raise error.ParseError(_("unknown method '%s'") % t)
|
|
|
|
|
|
# template evaluation
|
|
|
|
|
|
def getsymbol(exp):
|
|
|
if exp[0] == 'symbol':
|
|
|
return exp[1]
|
|
|
raise error.ParseError(_("expected a symbol"))
|
|
|
|
|
|
def getlist(x):
|
|
|
if not x:
|
|
|
return []
|
|
|
if x[0] == 'list':
|
|
|
return getlist(x[1]) + [x[2]]
|
|
|
return [x]
|
|
|
|
|
|
def getfilter(exp, context):
|
|
|
f = getsymbol(exp)
|
|
|
if f not in context._filters:
|
|
|
raise error.ParseError(_("unknown function '%s'") % f)
|
|
|
return context._filters[f]
|
|
|
|
|
|
def gettemplate(exp, context):
|
|
|
if exp[0] == 'string':
|
|
|
return compiletemplate(exp[1], context)
|
|
|
if exp[0] == 'symbol':
|
|
|
return context._load(exp[1])
|
|
|
raise error.ParseError(_("expected template specifier"))
|
|
|
|
|
|
def runstring(context, mapping, data):
|
|
|
return data
|
|
|
|
|
|
def runsymbol(context, mapping, key):
|
|
|
v = mapping.get(key)
|
|
|
if v is None:
|
|
|
v = context._defaults.get(key, '')
|
|
|
if hasattr(v, '__call__'):
|
|
|
return v(**mapping)
|
|
|
return v
|
|
|
|
|
|
def buildfilter(exp, context):
|
|
|
func, data = compileexp(exp[1], context)
|
|
|
filt = getfilter(exp[2], context)
|
|
|
return (runfilter, (func, data, filt))
|
|
|
|
|
|
def runfilter(context, mapping, data):
|
|
|
func, data, filt = data
|
|
|
return filt(func(context, mapping, data))
|
|
|
|
|
|
def buildmap(exp, context):
|
|
|
func, data = compileexp(exp[1], context)
|
|
|
ctmpl = gettemplate(exp[2], context)
|
|
|
return (runmap, (func, data, ctmpl))
|
|
|
|
|
|
def runmap(context, mapping, data):
|
|
|
func, data, ctmpl = data
|
|
|
d = func(context, mapping, data)
|
|
|
lm = mapping.copy()
|
|
|
|
|
|
for i in d:
|
|
|
if isinstance(i, dict):
|
|
|
lm.update(i)
|
|
|
for f, d in ctmpl:
|
|
|
yield f(context, lm, d)
|
|
|
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 buildfunc(exp, context):
|
|
|
n = getsymbol(exp[1])
|
|
|
args = [compileexp(x, context) for x in getlist(exp[2])]
|
|
|
if n in context._filters:
|
|
|
if len(args) != 1:
|
|
|
raise error.ParseError(_("filter %s expects one argument") % n)
|
|
|
f = context._filters[n]
|
|
|
return (runfilter, (args[0][0], args[0][1], f))
|
|
|
elif n in context._funcs:
|
|
|
f = context._funcs[n]
|
|
|
return (f, args)
|
|
|
|
|
|
methods = {
|
|
|
"string": lambda e, c: (runstring, e[1]),
|
|
|
"symbol": lambda e, c: (runsymbol, e[1]),
|
|
|
"group": lambda e, c: compileexp(e[1], c),
|
|
|
# ".": buildmember,
|
|
|
"|": buildfilter,
|
|
|
"%": buildmap,
|
|
|
"func": buildfunc,
|
|
|
}
|
|
|
|
|
|
# template engine
|
|
|
|
|
|
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 _load(self, t):
|
|
|
'''load, parse, and cache a template'''
|
|
|
if t not in self._cache:
|
|
|
self._cache[t] = compiletemplate(self._loader(t), self)
|
|
|
return self._cache[t]
|
|
|
|
|
|
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(func(self, mapping, data) for func, data in
|
|
|
self._load(t))
|
|
|
|
|
|
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.ecache = {}
|
|
|
|
|
|
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 KeyError, inst:
|
|
|
raise util.Abort(_('"%s" not in template map') % inst.args[0])
|
|
|
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'
|
|
|
if ttype not in self.ecache:
|
|
|
self.ecache[ttype] = engines[ttype](self.load,
|
|
|
self.filters, self.defaults)
|
|
|
proc = self.ecache[ttype]
|
|
|
|
|
|
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)
|
|
|
|
