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[Sass] Make sure the description of extend loops are deterministically ordered.

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This commit is contained in:
Nathan Weizenbaum 2010-03-08 23:02:43 -08:00
parent 03c2370405
commit 3abccd90fb
1 changed files with 8 additions and 9 deletions
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13
lib/sass/selector.rb
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@ -432,21 +432,20 @@ module Sass
# Raise a {Sass::SyntaxError} describing a loop of `@extend` directives.
#
# @todo Deterministically order the description based on line numbers
#
# @param supers [Array<Node>] The stack of selectors that contains the loop,
# ordered from deepest to most shallow.
# @raise [Sass::SyntaxError] Describing the loop
def handle_extend_loop(supers)
supers.inject([]) do |sels, sel|
next sels.push(sel) unless sels.first.eql?(sel)
raise Sass::SyntaxError.new("An @extend loop was found:\n" +
Haml::Util.enum_cons(sels.push(sel), 2).
map do |sel1, sel2|
conses = Haml::Util.enum_cons(sels.push(sel), 2).to_a
_, i = Haml::Util.enum_with_index(conses).max {|((_, sel1), _), ((_, sel2), _)| sel1.line <=> sel2.line}
loop = (conses[i..-1] + conses[0...i]).map do |sel1, sel2|
str = " #{sel1.inspect} extends #{sel2.inspect} on line #{sel1.line}"
str << " of " + sel1.filename if sel1.filename
str << " of " << sel1.filename if sel1.filename
str
end.join(",\n"))
end.join(",\n")
raise Sass::SyntaxError.new("An @extend loop was found:\n#{loop}")
end
# Should never get here
raise Sass::SyntaxError.new("An @extend loop exists, but the exact loop couldn't be found")