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# Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 of the
# License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301 USA
import re
debug = 0
class MiniTemplate:
def __init__(self, templ):
self._tokens = re.split("({{[^}]+}}|\[\[[^]]+\]\])", templ)
def t2l(self, tok):
return "line %s " % sum([tok.count("\n") for tok in self._tokens[:tok]])
def render_(self, data, i, result, context):
assert data is not None
if debug:
import traceback
print "ENTER render_() from %s" % traceback.format_stack()[-2].split(",", 1)[-1].strip().split("\n")[0].strip()
def get(d, key, default=""):
for k in key.split("."):
if d is None:
#raise ValueError("%s not in %s" % (key, od.keys()))
return default
if hasattr(d, "__getitem__"):
d = d[k]
else:
d = getattr(d, k)
return d
while i < len(self._tokens):
orig_token = token = self._tokens[i]
if debug:
print "--"*len(context)+"> process %s: %s, token: %s (%i)" % (self.t2l(i), ".".join(context), token.strip(), i)
if token.startswith("{{") and token.endswith("}}"):
token = token[2:-2]
try:
if token[0] == '#':
l = get(data, token[1:])
if l is not None:
out = str(len(l))
else:
out = "0"
else:
out = get(data, token)
except KeyError:
raise KeyError("%s: No value for key %s. context: %s possible: %s" % (self.t2l(i), orig_token, ".".join(context), data.keys()))
except ValueError, e:
raise ValueError("%s: %s. context: %s possible: %s" % (self.t2l(i), e, ".".join(context), data.keys()))
if out is not None:
result.append(out)
elif token.startswith("[[") and token.endswith("]]"):
if debug:
print "Found block %s" % token
token = token[2:-2]
if token[0] in ("/", "!") and token[1:] == (context[-1] if not context[-1].startswith("[") else context[-2]):
if debug:
print "%s: leaving context %s through %s at %s" % (self.t2l(i), ".".join(context), token, i)
if token[0] == "!":
# skip until the real end of the block
count = 1
i += 1
while i < len(self._tokens):
if self._tokens[i] == "[[/"+token[1:]+"]]":
count -= 1
if count == 0:
break
elif self._tokens[i] in ("[["+token[1:]+"]]", "[[?"+token[1:]+"]]"):
count += 1
i += 1
return i
elif token[0] == "?":
token = token[1:]
enter = False
if token.startswith("if|"):
try:
enter = eval(token[3:], data, data)
if debug:
print "%s: evaluated %s in context %s to %s" % (self.t2l(i), token, data.keys(), enter)
token = "if"
except Exception, exc:
print "%s: Error evaluating %s in context %s: %s" % (self.t2l(i), token, data.keys(), exc)
raise
if enter or data.has_key(token) and get(data, token):
if debug:
print "%s: entering context %s at %s" % (self.t2l(i), ".".join(context + [token]), i+1)
i = self.render_(data, i+1, result, context+[token])
else:
if debug:
print "%s: context %s at %s has no value for block %s, trynig to find !%s or /%s" % (self.t2l(i), ".".join(context + [token]), i+1, token, token, token)
count = 1
i += 1
while i < len(self._tokens):
if self._tokens[i] == "[[!"+token+"]]" and count == 1:
i = self.render_(data, i+1, result, context + [token])
i += 1
count = 0
break
elif self._tokens[i] == "[[/"+token+"]]":
count -= 1
if count == 0:
break
elif self._tokens[i] in ("[["+token+"]]", "[[?"+token+"]]"):
count += 1
i += 1
if count != 0:
print "/%s not found!" % token
else:
try:
sub = get(data, token)
except KeyError:
raise KeyError("%s: No value for key %s. context: %s possible: %s" % (self.t2l(i), orig_token, ".".join(context), data.keys()))
if type(sub) is list:
if debug:
print "%s: token %s in context %s is a list of size %i" % (self.t2l(i), ".".join(context), token, len(sub))
k = i
for j, item in enumerate(sub):
itemd = dict(item)
itemd[":#"] = str(j+1)
if j < len(sub)-1:
itemd["needsep"] = 1
else:
itemd["needsep"] = 0
if debug:
print "%s: entering lcontext %s at %s" % (self.t2l(i), ".".join(context + [token, "[%s]"%j]), i+1)
k = self.render_(itemd, i+1, result, context + [token, "[%s]"%j])
if not sub:
# empty list, go through tokens until we find the closing one
count = 1
k += 1
while k < len(self._tokens):
if debug:
print "empty list %s, skip %s (%i)" % (token, self._tokens[k], count)
if self._tokens[k] == "[[/"+token+"]]":
count -= 1
if count == 0:
break
elif self._tokens[k] in ("[["+token+"]]", "[[?"+token+"]]"):
count += 1
k += 1
i = k
else:
if debug:
print "%s: entering context %s at %s" % (self.t2l(i), ".".join(context + [token]), i+1)
i = self.render_(sub, i+1, result, context + [token])
else:
result.append(token)
i += 1
if debug:
print "leaving at token %i" % i
return i
def render(self, data):
l = []
self.render_(data, 0, l, [])
return "".join([str(s) for s in l])
if __name__ == "__main__":
template = """
{{title}}
[[objects]]
{{name}}
There are {{#subobjects}} objects in this object:
{{:#}}.[[subobjects]]{{:#}} - {{name}}
[[?error]]ERROR![[/error]][[/subobjects]]
Type: {{thing.type}}
[[thing]]
Value: {{value}}
[[/thing]]
[[/objects]]
"""
data = {
"title" : "Title",
"name" : "Some Name",
"objects" : [
{
"name" : "object1",
"subobjects" : [
{ "name" : "subobject1", "error" : 1},
],
"thing" : {
"type" : "int",
"value" : 12345
}
},
{
"name" : "object2",
"subobjects" : [
{ "name" : "subobject1of2", "error" : 0 },
],
"thing" : {
"type" : "str",
"value" : "qqqq"
}
},
]
}
tem = MiniTemplate(template)
print tem.render(data).replace("\\\n", "")
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