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class String
def html_safe?
defined?(@_rails_html_safe) && @_rails_html_safe
end
def html_safe!
@_rails_html_safe = true
self
end
def html_safe
dup.html_safe!
end
alias original_plus +
def +(other)
result = original_plus(other)
if html_safe? && also_html_safe?(other)
result.html_safe!
else
result
end
end
alias original_concat <<
def <<(other)
result = original_concat(other)
unless html_safe? && also_html_safe?(other)
@_rails_html_safe = false
end
result
end
def concat(other)
self << other
end
private
def also_html_safe?(other)
other.respond_to?(:html_safe?) && other.html_safe?
end
end
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