0793beded9
Add alias and implications associations to Tag. Use them in alias_and_implication list instead of duplicating the alias/implication lookup code.
67 lines
1.8 KiB
Ruby
67 lines
1.8 KiB
Ruby
class WikiPagePresenter
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attr_reader :wiki_page
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def initialize(wiki_page)
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@wiki_page = wiki_page
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end
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def excerpt
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wiki_page.body
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end
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def blurb
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DText.strip(excerpt.to_s)
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end
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# Produce a formatted page that shows the difference between two versions of a page.
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def diff(other_version)
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pattern = Regexp.new('(?:<.+?>)|(?:[0-9_A-Za-z\x80-\xff]+[\x09\x20]?)|(?:[ \t]+)|(?:\r?\n)|(?:.+?)')
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thisarr = self.body.scan(pattern)
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otharr = other_version.body.scan(pattern)
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cbo = Diff::LCS::ContextDiffCallbacks.new
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diffs = thisarr.diff(otharr, cbo)
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escape_html = lambda {|str| str.gsub(/&/,'&').gsub(/</,'<').gsub(/>/,'>')}
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output = thisarr;
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output.each { |q| q.replace(CGI.escape_html(q)) }
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diffs.reverse_each do |hunk|
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newchange = hunk.max{|a,b| a.old_position <=> b.old_position}
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newstart = newchange.old_position
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oldstart = hunk.min{|a,b| a.old_position <=> b.old_position}.old_position
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if newchange.action == '+'
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output.insert(newstart, "</ins>")
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end
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hunk.reverse_each do |chg|
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case chg.action
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when '-'
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oldstart = chg.old_position
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output[chg.old_position] = "" if chg.old_element.match(/^\r?\n$/)
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when '+'
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if chg.new_element.match(/^\r?\n$/)
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output.insert(chg.old_position, "[nl]")
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else
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output.insert(chg.old_position, "#{escape_html[chg.new_element]}")
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end
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end
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end
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if newchange.action == '+'
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output.insert(newstart, "<ins>")
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end
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if hunk[0].action == '-'
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output.insert((newstart == oldstart || newchange.action != '+') ? newstart+1 : newstart, "</del>")
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output.insert(oldstart, "<del>")
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end
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end
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output.join.gsub(/\r?\n/, "[nl]")
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end
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end
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