Class: Dcs::Debian::Searcher

Inherits:
Object
  • Object
show all
Defined in:
lib/dcs/debian/helper.rb

Constant Summary collapse

BASE_URL = 
"http://codesearch.debian.net"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Searcher

Returns a new instance of Searcher.



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# File 'lib/dcs/debian/helper.rb', line 11

def initialize
  @page_limit = 10
  @n_limit = 10
end

Instance Attribute Details

#n_limit ⇒ Object

Returns the value of attribute n_limit.



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# File 'lib/dcs/debian/helper.rb', line 7

def n_limit
  @n_limit
end

#page_limit ⇒ Object

Returns the value of attribute page_limit.



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# File 'lib/dcs/debian/helper.rb', line 6

def page_limit
  @page_limit
end

Instance Method Details

#extract_entry(node, target) ⇒ Object 



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# File 'lib/dcs/debian/helper.rb', line 58

def extract_entry(node, target)
  url = BASE_URL + node.xpath("a").attribute("href").text
  raw = node.xpath("a/code").text
  raw =~ /(.+)debian\/(.+):(.+)/
  package = $1
  file = $2
  line = $3
  entry = {}
  case file
  when target
    entry[:path] = raw
    entry[:url] = url
    entry[:package] = package
    entry[:file] = file
    entry[:line] = line
    node.xpath("pre").each do |pre|
      data = []
      pre.children.each do |cnode|
        if cnode.kind_of?(Nokogiri::XML::Element)
          if cnode.name != "br"
            data << indent + cnode.text
          end
        else
          data << indent + cnode.text
        end
      end
      entry[:pre] = data.join("\n")
    end
  else
    raise Error
  end
  entry
end

#extract_next_page_uri(node) ⇒ Object 



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# File 'lib/dcs/debian/helper.rb', line 45

def extract_next_page_uri(node)
  next_uri = nil
  node.xpath("//div[@id='pagination']").each do |div|
    div.xpath("a").each do |a|
      case a.text
      when "Next page"
        next_uri = BASE_URL + a.attribute("href").text
      end
    end
  end
  next_uri
end

#indent ⇒ Object 



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# File 'lib/dcs/debian/helper.rb', line 92

def indent
  " " * 2
end

#pagination(target, keyword) ⇒ Object 



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# File 'lib/dcs/debian/helper.rb', line 16

def pagination(target, keyword)
  next_uri = nil

  data = []
  unless next_uri
    next_uri = sprintf("%s/search?q=%s+path%%3Adebian%%2F%s%%24",
                       BASE_URL, keyword, target)
  end

  page = 1
  n = 1
  until next_uri.nil? or n > @n_limit or page > @page_limit
    html = open(next_uri, "r:utf-8").read
    Nokogiri.parse(html) do |doc|
      doc.xpath("//ul[@id='results']/li").each do |li|
        entry = extract_entry(li, target)
        unless entry.empty?
          if entry[:pre].include?(keyword)
            n = n + 1
            yield(entry)
          end
        end
      end
      next_uri = extract_next_page_uri(doc)
    end
    page = page + 1
  end
end