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Fixed AST generation for nth-(first|last)-of-type.

This commit is contained in:
Yorick Peterse 2014-11-15 18:27:15 +01:00
parent 9eead81a7c
commit b464815577
3 changed files with 108 additions and 179 deletions
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48
lib/oga/css/parser.y
View File

@ -424,10 +424,11 @@ end
## ##
# @param [String] count_axis # @param [String] count_axis
# @param [AST::Node] arg # @param [AST::Node] arg
# @param [AST::Node] count_test
# @return [AST::Node] # @return [AST::Node]
# #
def generate_nth_child(count_axis, arg) def generate_nth_child(count_axis, arg, count_test = s(:test, nil, '*'))
count_call = s(:call, 'count', s(:axis, count_axis, s(:test, nil, '*'))) count_call = s(:call, 'count', s(:axis, count_axis, count_test))
# literal 2, 4, etc # literal 2, 4, etc
if int_node?(arg) if int_node?(arg)
@ -462,9 +463,7 @@ end
# @return [AST::Node] # @return [AST::Node]
# #
def on_pseudo_class_nth_of_type(arg) def on_pseudo_class_nth_of_type(arg)
position_node = s(:call, 'position') return generate_nth_child('preceding-sibling', arg, current_element)
return generate_nth_of_type(arg, position_node)
end end
## ##
@ -474,44 +473,7 @@ end
# @return [AST::Node] # @return [AST::Node]
# #
def on_pseudo_class_nth_last_of_type(arg) def on_pseudo_class_nth_last_of_type(arg)
position_node = s( return generate_nth_child('following-sibling', arg, current_element)
:add,
s(:sub, s(:call, 'last'), s(:call, 'position')),
s(:int, 1)
)
return generate_nth_of_type(arg, position_node)
end
##
# @param [AST::Node] arg
# @param [AST::Node] position_node
# @return [AST::Node]
#
def generate_nth_of_type(arg, position_node)
# literal 2, 4, etc
if int_node?(arg)
node = s(:eq, position_node, arg)
else
step, offset = *arg
compare = step_comparison(step)
# 2n+2, 2n-4, etc
if offset
mod_val = step_modulo_value(step)
node = s(
:and,
s(compare, position_node, offset),
s(:eq, s(:mod, s(:sub, position_node, offset), mod_val), s(:int, 0))
)
# 2n, n, -2n
else
node = s(:eq, s(:mod, position_node, step), s(:int, 0))
end
end
return node
end end
## ##

120
spec/oga/css/parser/pseudo_classes/nth_last_of_type_spec.rb
View File

@ -2,109 +2,93 @@ require 'spec_helper'
describe Oga::CSS::Parser do describe Oga::CSS::Parser do
context ':nth-last-of-type pseudo class' do context ':nth-last-of-type pseudo class' do
example 'parse the x:nth-last-of-type(1) pseudo class' do
parse_css('x:nth-last-of-type(1)').should == parse_xpath(
'descendant::x[count(following-sibling::x) = 0]'
)
end
example 'parse the :nth-last-of-type(1) pseudo class' do example 'parse the :nth-last-of-type(1) pseudo class' do
parse_css(':nth-last-of-type(1)').should == parse_xpath( parse_css(':nth-last-of-type(1)').should == parse_xpath(
'descendant::*[(last() - position() + 1) = 1]' 'descendant::*[count(following-sibling::*) = 0]'
) )
end end
example 'parse the :nth-last-of-type(2n) pseudo class' do example 'parse the :nth-last-of-type(2) pseudo class' do
parse_css(':nth-last-of-type(2n)').should == parse_xpath( parse_css(':nth-last-of-type(2)').should == parse_xpath(
'descendant::*[((last() - position() + 1) mod 2) = 0]' 'descendant::*[count(following-sibling::*) = 1]'
) )
end end
example 'parse the :nth-last-of-type(3n) pseudo class' do example 'parse the x:nth-last-of-type(even) pseudo class' do
parse_css(':nth-last-of-type(3n)').should == parse_xpath( parse_css('x:nth-last-of-type(even)').should == parse_xpath(
'descendant::*[((last() - position() + 1) mod 3) = 0]' 'descendant::x[((count(following-sibling::x) + 1) mod 2) = 0]'
) )
end end
example 'parse the :nth-last-of-type(2n+5) pseudo class' do example 'parse the x:nth-last-of-type(odd) pseudo class' do
parse_css(':nth-last-of-type(2n+5)').should == parse_xpath( parse_css('x:nth-last-of-type(odd)').should == parse_xpath(
'descendant::*[((last() - position() + 1) >= 5) ' \ 'descendant::x[(count(following-sibling::x) + 1) >= 1 ' \
'and ((((last() - position() + 1) - 5) mod 2) = 0)]' 'and (((count(following-sibling::x) + 1) - 1) mod 2) = 0]'
) )
end end
example 'parse the :nth-last-of-type(3n+5) pseudo class' do example 'parse the x:nth-last-of-type(n) pseudo class' do
parse_css(':nth-last-of-type(3n+5)').should == parse_xpath( parse_css('x:nth-last-of-type(n)').should == parse_xpath(
'descendant::*[((last() - position() + 1) >= 5) ' \ 'descendant::x[((count(following-sibling::x) + 1) mod 1) = 0]'
'and ((((last() - position() + 1) - 5) mod 3) = 0)]'
) )
end end
example 'parse the :nth-last-of-type(2n-5) pseudo class' do example 'parse the x:nth-last-of-type(-n) pseudo class' do
parse_css(':nth-last-of-type(2n-5)').should == parse_xpath( parse_css('x:nth-last-of-type(-n)').should == parse_xpath(
'descendant::*[((last() - position() + 1) >= 1) ' \ 'descendant::x[((count(following-sibling::x) + 1) mod 1) = 0]'
'and ((((last() - position() + 1) - 1) mod 2) = 0)]'
) )
end end
example 'parse the :nth-last-of-type(2n-6) pseudo class' do example 'parse the x:nth-last-of-type(-n+6) pseudo class' do
parse_css(':nth-last-of-type(2n-6)').should == parse_xpath( parse_css('x:nth-last-of-type(-n+6)').should == parse_xpath(
'descendant::*[((last() - position() + 1) >= 2) ' \ 'descendant::x[((count(following-sibling::x) + 1) <= 6) ' \
'and ((((last() - position() + 1) - 2) mod 2) = 0)]' 'and (((count(following-sibling::x) + 1) - 6) mod 1) = 0]'
) )
end end
example 'parse the :nth-last-of-type(-2n+5) pseudo class' do example 'parse the x:nth-last-of-type(n+5) pseudo class' do
parse_css(':nth-last-of-type(-2n+5)').should == parse_xpath( parse_css('x:nth-last-of-type(n+5)').should == parse_xpath(
'descendant::*[((last() - position() + 1) <= 5) ' \ 'descendant::x[(count(following-sibling::x) + 1) >= 5 ' \
'and (((last() - position() + 1) - 5) mod 2) = 0]' 'and (((count(following-sibling::x) + 1) - 5) mod 1) = 0]'
) )
end end
example 'parse the :nth-last-of-type(-2n-5) pseudo class' do example 'parse the x:nth-last-of-type(2n) pseudo class' do
parse_css(':nth-last-of-type(-2n-5)').should == parse_xpath( parse_css('x:nth-last-of-type(2n)')
'descendant::*[((last() - position() + 1) <= -1) ' \ .should == parse_css('x:nth-last-of-type(even)')
'and (((last() - position() + 1) - -1) mod 2) = 0]' end
example 'parse the x:nth-last-of-type(2n+1) pseudo class' do
parse_css('x:nth-last-of-type(2n+1)').should == parse_xpath(
'descendant::x[(count(following-sibling::x) + 1) >= 1 ' \
'and (((count(following-sibling::x) + 1) - 1) mod 2) = 0]'
) )
end end
example 'parse the :nth-last-of-type(-2n-6) pseudo class' do example 'parse the x:nth-last-of-type(3n+1) pseudo class' do
parse_css(':nth-last-of-type(-2n-6)').should == parse_xpath( parse_css('x:nth-last-of-type(3n+1)').should == parse_xpath(
'descendant::*[((last() - position() + 1) <= -2) ' \ 'descendant::x[(count(following-sibling::x) + 1) >= 1 ' \
'and (((last() - position() + 1) - -2) mod 2) = 0]' 'and (((count(following-sibling::x) + 1) - 1) mod 3) = 0]'
) )
end end
example 'parse the :nth-last-of-type(even) pseudo class' do example 'parse the x:nth-last-of-type(2n-6) pseudo class' do
parse_css(':nth-last-of-type(even)').should == parse_xpath( parse_css('x:nth-last-of-type(2n-6)').should == parse_xpath(
'descendant::*[((last() - position() + 1) mod 2) = 0]' 'descendant::x[(count(following-sibling::x) + 1) >= 2 ' \
'and (((count(following-sibling::x) + 1) - 2) mod 2) = 0]'
) )
end end
example 'parse the :nth-last-of-type(odd) pseudo class' do example 'parse the x:nth-last-of-type(-2n+6) pseudo class' do
parse_css(':nth-last-of-type(odd)').should == parse_xpath( parse_css('x:nth-last-of-type(-2n+6)').should == parse_xpath(
'descendant::*[((last() - position() + 1) >= 1) ' \ 'descendant::x[((count(following-sibling::x) + 1) <= 6) ' \
'and ((((last() - position() + 1) - 1) mod 2) = 0)]' 'and (((count(following-sibling::x) + 1) - 6) mod 2) = 0]'
)
end
example 'parse the :nth-last-of-type(n) pseudo class' do
parse_css(':nth-last-of-type(n)').should == parse_xpath(
'descendant::*[((last() - position() + 1) mod 1) = 0]'
)
end
example 'parse the :nth-last-of-type(n+5) pseudo class' do
parse_css(':nth-last-of-type(n+5)').should == parse_xpath(
'descendant::*[(last() - position() + 1) >= 5 ' \
'and (((last() - position() + 1) - 5) mod 1) = 0]'
)
end
example 'parse the :nth-last-of-type(-n) pseudo class' do
parse_css(':nth-last-of-type(-n)').should == parse_xpath(
'descendant::*[((last() - position() + 1) mod 1) = 0]'
)
end
example 'parse the :nth-last-of-type(-n+5) pseudo class' do
parse_css(':nth-last-of-type(-n+5)').should == parse_xpath(
'descendant::*[((last() - position() + 1) <= 5) ' \
'and (((last() - position() + 1) - 5) mod 1) = 0]'
) )
end end
end end

119
spec/oga/css/parser/pseudo_classes/nth_of_type_spec.rb
View File

@ -2,109 +2,92 @@ require 'spec_helper'
describe Oga::CSS::Parser do describe Oga::CSS::Parser do
context ':nth-of-type pseudo class' do context ':nth-of-type pseudo class' do
example 'parse the x:nth-of-type(1) pseudo class' do
parse_css('x:nth-of-type(1)').should == parse_xpath(
'descendant::x[count(preceding-sibling::x) = 0]'
)
end
example 'parse the :nth-of-type(1) pseudo class' do example 'parse the :nth-of-type(1) pseudo class' do
parse_css(':nth-of-type(1)').should == parse_xpath( parse_css(':nth-of-type(1)').should == parse_xpath(
'descendant::*[position() = 1]' 'descendant::*[count(preceding-sibling::*) = 0]'
) )
end end
example 'parse the :nth-of-type(2n) pseudo class' do example 'parse the :nth-of-type(2) pseudo class' do
parse_css(':nth-of-type(2n)').should == parse_xpath( parse_css(':nth-of-type(2)').should == parse_xpath(
'descendant::*[(position() mod 2) = 0]' 'descendant::*[count(preceding-sibling::*) = 1]'
) )
end end
example 'parse the :nth-of-type(3n) pseudo class' do example 'parse the x:nth-of-type(even) pseudo class' do
parse_css(':nth-of-type(3n)').should == parse_xpath( parse_css('x:nth-of-type(even)').should == parse_xpath(
'descendant::*[(position() mod 3) = 0]' 'descendant::x[((count(preceding-sibling::x) + 1) mod 2) = 0]'
) )
end end
example 'parse the :nth-of-type(2n+5) pseudo class' do example 'parse the x:nth-of-type(odd) pseudo class' do
parse_css(':nth-of-type(2n+5)').should == parse_xpath( parse_css('x:nth-of-type(odd)').should == parse_xpath(
'descendant::*[(position() >= 5) ' \ 'descendant::x[(count(preceding-sibling::x) + 1) >= 1 ' \
'and (((position() - 5) mod 2) = 0)]' 'and (((count(preceding-sibling::x) + 1) - 1) mod 2) = 0]'
) )
end end
example 'parse the :nth-of-type(3n+5) pseudo class' do example 'parse the x:nth-of-type(n) pseudo class' do
parse_css(':nth-of-type(3n+5)').should == parse_xpath( parse_css('x:nth-of-type(n)').should == parse_xpath(
'descendant::*[(position() >= 5) ' \ 'descendant::x[((count(preceding-sibling::x) + 1) mod 1) = 0]'
'and (((position() - 5) mod 3) = 0)]'
) )
end end
example 'parse the :nth-of-type(2n-5) pseudo class' do example 'parse the x:nth-of-type(-n) pseudo class' do
parse_css(':nth-of-type(2n-5)').should == parse_xpath( parse_css('x:nth-of-type(-n)').should == parse_xpath(
'descendant::*[(position() >= 1) ' \ 'descendant::x[((count(preceding-sibling::x) + 1) mod 1) = 0]'
'and (((position() - 1) mod 2) = 0)]'
) )
end end
example 'parse the :nth-of-type(2n-6) pseudo class' do example 'parse the x:nth-of-type(-n+6) pseudo class' do
parse_css(':nth-of-type(2n-6)').should == parse_xpath( parse_css('x:nth-of-type(-n+6)').should == parse_xpath(
'descendant::*[(position() >= 2) ' \ 'descendant::x[((count(preceding-sibling::x) + 1) <= 6) ' \
'and (((position() - 2) mod 2) = 0)]' 'and (((count(preceding-sibling::x) + 1) - 6) mod 1) = 0]'
) )
end end
example 'parse the :nth-of-type(-2n+5) pseudo class' do example 'parse the x:nth-of-type(n+5) pseudo class' do
parse_css(':nth-of-type(-2n+5)').should == parse_xpath( parse_css('x:nth-of-type(n+5)').should == parse_xpath(
'descendant::*[(position() <= 5) ' \ 'descendant::x[(count(preceding-sibling::x) + 1) >= 5 ' \
'and ((position() - 5) mod 2) = 0]' 'and (((count(preceding-sibling::x) + 1) - 5) mod 1) = 0]'
) )
end end
example 'parse the :nth-of-type(-2n-5) pseudo class' do example 'parse the x:nth-of-type(2n) pseudo class' do
parse_css(':nth-of-type(-2n-5)').should == parse_xpath( parse_css('x:nth-of-type(2n)').should == parse_css('x:nth-of-type(even)')
'descendant::*[(position() <= -1) ' \ end
'and ((position() - -1) mod 2) = 0]'
example 'parse the x:nth-of-type(2n+1) pseudo class' do
parse_css('x:nth-of-type(2n+1)').should == parse_xpath(
'descendant::x[(count(preceding-sibling::x) + 1) >= 1 ' \
'and (((count(preceding-sibling::x) + 1) - 1) mod 2) = 0]'
) )
end end
example 'parse the :nth-of-type(-2n-6) pseudo class' do example 'parse the x:nth-of-type(3n+1) pseudo class' do
parse_css(':nth-of-type(-2n-6)').should == parse_xpath( parse_css('x:nth-of-type(3n+1)').should == parse_xpath(
'descendant::*[(position() <= -2) ' \ 'descendant::x[(count(preceding-sibling::x) + 1) >= 1 ' \
'and ((position() - -2) mod 2) = 0]' 'and (((count(preceding-sibling::x) + 1) - 1) mod 3) = 0]'
) )
end end
example 'parse the :nth-of-type(even) pseudo class' do example 'parse the x:nth-of-type(2n-6) pseudo class' do
parse_css(':nth-of-type(even)').should == parse_xpath( parse_css('x:nth-of-type(2n-6)').should == parse_xpath(
'descendant::*[(position() mod 2) = 0]' 'descendant::x[(count(preceding-sibling::x) + 1) >= 2 ' \
'and (((count(preceding-sibling::x) + 1) - 2) mod 2) = 0]'
) )
end end
example 'parse the :nth-of-type(odd) pseudo class' do example 'parse the x:nth-of-type(-2n+6) pseudo class' do
parse_css(':nth-of-type(odd)').should == parse_xpath( parse_css('x:nth-of-type(-2n+6)').should == parse_xpath(
'descendant::*[(position() >= 1) ' \ 'descendant::x[((count(preceding-sibling::x) + 1) <= 6) ' \
'and (((position() - 1) mod 2) = 0)]' 'and (((count(preceding-sibling::x) + 1) - 6) mod 2) = 0]'
)
end
example 'parse the :nth-of-type(n) pseudo class' do
parse_css(':nth-of-type(n)').should == parse_xpath(
'descendant::*[(position() mod 1) =0]'
)
end
example 'parse the :nth-of-type(n+5) pseudo class' do
parse_css(':nth-of-type(n+5)').should == parse_xpath(
'descendant::*[position() >= 5 ' \
'and ((position() - 5) mod 1) = 0]'
)
end
example 'parse the :nth-of-type(-n) pseudo class' do
parse_css(':nth-of-type(-n)').should == parse_xpath(
'descendant::*[(position() mod 1) = 0]'
)
end
example 'parse the :nth-of-type(-n+5) pseudo class' do
parse_css(':nth-of-type(-n+5)').should == parse_xpath(
'descendant::*[(position() <= 5) ' \
'and ((position() - 5) mod 1) = 0]'
) )
end end
end end