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Cleaned up CSS parser code for counting siblings.

This commit is contained in:
Yorick Peterse 2014-11-15 18:31:08 +01:00
parent 448ff56e38
commit 23b408fe4f
1 changed files with 89 additions and 96 deletions
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185
lib/oga/css/parser.y
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@ -421,6 +421,91 @@ end
return generate_nth_child('following-sibling', arg) return generate_nth_child('following-sibling', arg)
end end
##
# Generates the AST for the `nth-of-type` pseudo class.
#
# @param [AST::Node] arg
# @return [AST::Node]
#
def on_pseudo_class_nth_of_type(arg)
return generate_nth_child('preceding-sibling', arg, current_element)
end
##
# Generates the AST for the `nth-last-of-type` pseudo class.
#
# @param [AST::Node] arg
# @return [AST::Node]
#
def on_pseudo_class_nth_last_of_type(arg)
return generate_nth_child('following-sibling', arg, current_element)
end
##
# Generates the AST for the `:first-child` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_first_child
return generate_no_siblings('preceding-sibling')
end
##
# Generates the AST for the `:last-child` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_last_child
return generate_no_siblings('following-sibling')
end
##
# Generates the AST for the `:first-of-type` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_first_of_type
return generate_no_siblings('preceding-sibling', current_element)
end
##
# Generates the AST for the `:last-of-type` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_last_of_type
return generate_no_siblings('following-sibling', current_element)
end
##
# Generates the AST for the `:only-child` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_only_child
return s(:and, on_pseudo_class_first_child, on_pseudo_class_last_child)
end
##
# Generates the AST for the `:only-of-type` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_only_of_type
return s(:and, on_pseudo_class_first_of_type, on_pseudo_class_last_of_type)
end
##
# Generates the AST for the `:empty` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_empty
return s(:call, 'not', s(:axis, 'child', s(:type_test, 'node')))
end
private
## ##
# @param [String] count_axis # @param [String] count_axis
# @param [AST::Node] arg # @param [AST::Node] arg
@ -457,106 +542,14 @@ end
end end
## ##
# Generates the AST for the `nth-of-type` pseudo class. # @param [String] axis
# # @param [AST::Node] test
# @param [AST::Node] arg
# @return [AST::Node] # @return [AST::Node]
# #
def on_pseudo_class_nth_of_type(arg) def generate_no_siblings(axis, test = s(:test, nil, '*'))
return generate_nth_child('preceding-sibling', arg, current_element) return s(:eq, s(:call, 'count', s(:axis, axis, test)), s(:int, 0))
end end
##
# Generates the AST for the `nth-last-of-type` pseudo class.
#
# @param [AST::Node] arg
# @return [AST::Node]
#
def on_pseudo_class_nth_last_of_type(arg)
return generate_nth_child('following-sibling', arg, current_element)
end
##
# Generates the AST for the `:first-child` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_first_child
return s(
:eq,
s(:call, 'count', s(:axis, 'preceding-sibling', s(:test, nil, '*'))),
s(:int, 0)
)
end
##
# Generates the AST for the `:last-child` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_last_child
return s(
:eq,
s(:call, 'count', s(:axis, 'following-sibling', s(:test, nil, '*'))),
s(:int, 0)
)
end
##
# Generates the AST for the `:first-of-type` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_first_of_type
return s(
:eq,
s(:call, 'count', s(:axis, 'preceding-sibling', current_element)),
s(:int, 0)
)
end
##
# Generates the AST for the `:last-of-type` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_last_of_type
return s(
:eq,
s(:call, 'count', s(:axis, 'following-sibling', current_element)),
s(:int, 0)
)
end
##
# Generates the AST for the `:only-child` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_only_child
return s(:and, on_pseudo_class_first_child, on_pseudo_class_last_child)
end
##
# Generates the AST for the `:only-of-type` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_only_of_type
return s(:and, on_pseudo_class_first_of_type, on_pseudo_class_last_of_type)
end
##
# Generates the AST for the `:empty` selector.
#
# @return [AST::Node]
#
def on_pseudo_class_empty
return s(:call, 'not', s(:axis, 'child', s(:type_test, 'node')))
end
private
## ##
# @param [AST::Node] node # @param [AST::Node] node
# @return [TrueClass|FalseClass] # @return [TrueClass|FalseClass]