Behavior on non definded name in Cheetah

[Paolo Pantaleo]

[I hope I am posting to the right place]

I have a cheetah template something like this:

x is: $x
y is: $y
z is: $z

[Actually more complicated]

If for example $y is not defined I get an exception and the parsing
of the template stops. Is there any way to substitute $y with an emty
string and making cheeta going on with parsing?

Thnx
PAolo

 

[Stephan Diehl]

[I hope I am posting to the right place]

I have a cheetah template something like this:

x is: $x
y is: $y
z is: $z

[Actually more complicated]

If for example $y is not defined I get an exception and the parsing
of the template stops. Is there any way to substitute $y with an emty
string and making cheeta going on with parsing?

Thnx
PAolo

http://cheetahtemplate.org/docs/users_guide_html_multipage/language.namemapper.missing.html

 

[Paolo Pantaleo]

[I hope I am posting to the right place]

I have a cheetah template something like this:

x is: $x
y is: $y
z is: $z

[Actually more complicated]

If for example $y is not defined I get an exception and the parsing
of the template stops. Is there any way to substitute $y with an emty
string and making cheeta going on with parsing?

Thnx
PAolo

http://cheetahtemplate.org/docs/users_guide_html_multipage/language.namemapper.missing.html

Actually I wanted to keep things simple for who writes the template,
so I am using this workaround: I define a class

class ClassMapper:
def __init__(self,dict={}):
self.__dict=dict
def getValue(self,str):
try:
return self.__dict[str]
except KeyError:
return ""

x=ClassMapper(dict)
Template(definition, searchList=[{"info":x.getValue}])



so the user should do

$info("name")

Maybe I could define a class that implements a dictionary and doesn''t
raise an exception for a key not present... but it seems to
complicated.

PAolo

 

[Peter Otten]

[I hope I am posting to the right place]

I have a cheetah template something like this:

x is: $x
y is: $y
z is: $z

[Actually more complicated]

If for example $y is not defined I get an exception and the parsing
of the template stops. Is there any way to substitute $y with an emty
string and making cheeta going on with parsing?

Thnx
PAolo

http://cheetahtemplate.org/docs/users_guide_html_multipage/language.namemapper.missing.html

Actually I wanted to keep things simple for who writes the template,
so I am using this workaround: I define a class

class ClassMapper:
def __init__(self,dict={}):
self.__dict=dict
def getValue(self,str):
try:
return self.__dict[str]
except KeyError:
return ""

x=ClassMapper(dict)
Template(definition, searchList=[{"info":x.getValue}])



so the user should do

$info("name")

Maybe I could define a class that implements a dictionary and doesn''t
raise an exception for a key not present... but it seems to
complicated.

You mean something like

from Cheetah.Template import Template

class Dict(dict):
def __getitem__(self, key):
return self.get(key, "")

template = """\
x is $x
y is $y
z is $z
"""
print Template(template, searchList=[Dict(x="x", y="y")])

You can also make a debugging version:

class Dict(dict):
def __getitem__(self, key):
return self.get(key, "#missing key: %r#" % key)

Peter

 

[Paolo Pantaleo]

Paolo Pantaleo wrote:
[I hope I am posting to the right place]

I have a cheetah template something like this:

x is: $x
y is: $y
z is: $z

[Actually more complicated]

If for example $y is not defined I get an exception and the parsing
of the template stops. Is there any way to substitute $y with an emty
string and making cheeta going on with parsing?

Thnx
PAolo


http://cheetahtemplate.org/docs/users_guide_html_multipage/language.namemapper.missing.html

Actually I wanted to keep things simple for who writes the template,
so I am using this workaround: I define a class

class ClassMapper:
def __init__(self,dict={}):
self.__dict=dict
def getValue(self,str):
try:
return self.__dict[str]
except KeyError:
return ""

x=ClassMapper(dict)
Template(definition, searchList=[{"info":x.getValue}])



so the user should do

$info("name")

Maybe I could define a class that implements a dictionary and doesn''t
raise an exception for a key not present... but it seems to
complicated.

You mean something like

from Cheetah.Template import Template

class Dict(dict):
def __getitem__(self, key):
return self.get(key, "")

template = """\
x is $x
y is $y
z is $z
"""
print Template(template, searchList=[Dict(x="x", y="y")])

You can also make a debugging version:

class Dict(dict):
def __getitem__(self, key):
return self.get(key, "#missing key: %r#" % key)

Peter

Wonderful, thnx a lot. Well not so complicated if you know how to do

PAolo