def evaluate_block(self, block):
# Get the binding's name
name = block.capture_call()
if name is None:
# This block does not call a binding
return self.__evaluate_collection(block.tokens)
if not self.bindings.contains(name):
# Name is unknown, discard block
Util.warning('Use of unknown binding {}:\n{}'.format(name, block))
return None
binding = self.bindings.get(name)
eval_tokens = TokenCollection()
if type(binding) is VariableBinding:
eval_binding = self.__evaluate_collection(binding.tokens)
eval_tokens.add_collection(eval_binding)
elif type(binding) is MacroBinding:
args = block.capture_args(binding.num_params == 1)
if len(args) != binding.num_params:
Util.warning('Macro {} takes {} args, got {}:\n{}'
.format(name, binding.num_params, len(args), block))
return None
self.bindings.push()
# Bind each parameter to the supplied argument
for arg, param in zip(args, binding.params):
self.bindings.add_variable(param.resolve(),
TokenCollection([arg]))
eval_binding = self.__evaluate_collection(binding.tokens)
eval_tokens.add_collection(eval_binding)
self.bindings.pop()
elif type(binding) is FunctionBinding:
args = block.capture_args(binding.num_params == [1])
if len(args) not in binding.num_params:
Util.warning('Function {} takes {} args, got {}:\n{}'
.format(name, binding.num_params, len(args), block))
return None
if binding.lazy:
# Feed block tokens directly to function
result = binding.func(self, args)
if result:
result = self.evaluate_block(result)
eval_tokens.add_collection(result)
else:
# Evaluate and resolve each argument
arguments = [self.evaluate_block(a).resolve() for a in args]
body = binding.func(self, arguments)
eval_tokens.add_collection(self.tokenizer.tokenize(body))
# Trim leading and trailing whitespace
eval_tokens.trim()
# Run page content through Markdown
if binding.protected \
and name == self.settings.Content \
and self.imports.Md:
content = eval_tokens.resolve()
md = self.imports.Md.markdown(content, output_format = 'html5')
md_token = Token(TokenType.Text, md)
eval_tokens = TokenCollection([md_token])
return eval_tokens
