Category Archives: Ruby

Ruby to create TOC from HTML

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Here is the code

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require "hpricot"
 
# HTML Outliner 0.4
# Copyright Christoffer Sawicki 2006
# Licensed under the same terms as Ruby
 
# Please send bug reports and improvements to
# christoffer.sawicki@gmail.com
 
# See the test cases at the bottom for usage
 
# Changes
#  * 0.4: An element can only have one id,
#         so pass the current id to the slugifier.
 
class HTMLOutliner
  class SimpleTree
    attr_accessor :root, :subtrees
 
    def initialize(root, subtrees = [])
      @root = root
      @subtrees = subtrees
    end
  end
end
 
class HTMLOutliner
  def initialize(hpricot_doc)
    @doc = hpricot_doc
  end
 
  def add_header_anchors!(slugifier = method(:default_slugifier))
    headers.each_with_index do |header, index|
      header[:id] = slugifier.call(header.inner_html, index, header[:id])
    end
  end
 
  def headers
    @headers ||= find_headers
  end
 
  def outline
    @outline ||= build_outline
  end
 
  protected
 
  def default_slugifier(string, index, current_id)
    # Just overwrite the current id
    string.downcase.gsub(/s+/, "_") + "_section"
  end
 
  private
 
  def find_headers
    find_headers_helper(@doc.children)
  end
 
  def find_headers_helper(nodes)
    nodes.inject([]) do |sum, node|
      if node.is_a? Hpricot::Text
        sum
      elsif node.name.match(/^h[1-6]$/i)
        sum + [ node ] + find_headers_helper(node.children)
      else
        sum + find_headers_helper(node.children)
      end
    end
  end
 
  def build_outline
    # TODO: This code needs some lovin' :-)
 
    result = []
    tree_stack = []
 
    headers.each do |header|
      new_tree = SimpleTree.new(header)
 
      until tree_stack.empty? || tree_stack.last.root.name < header.name
        tree_stack.pop
      end
 
      if tree_stack.empty?
        result.push(new_tree)
        tree_stack.push(new_tree)
      else
        tree_stack.last.subtrees.push(new_tree)
        tree_stack.push(new_tree)
      end
    end
 
    return result
  end
end
 
if __FILE__ == $0
  require "test/unit"
 
  class HTMLOutlinerTest < Test::Unit::TestCase
    def test_construction_with_root
      assert_nothing_raised do
        HTMLOutliner.new(Hpricot("<a></a>")).headers
      end
    end
 
    def test_construction_without_root
      assert_nothing_raised do
        HTMLOutliner.new(Hpricot("<a></a><b></b>")).headers
      end      
    end
 
    def test_headers
      input = <<-END
        <body>
          <h1 id="toc-hello">Hello</h1>
          <h1 id="toc-world">World</h1>
        </body>
      END
 
      doc = Hpricot(input)
      outliner = HTMLOutliner.new(doc)
 
      assert_equal 2,       outliner.headers.size
      assert_equal "Hello", outliner.headers[0].inner_html
      assert_equal "World", outliner.headers[1].inner_html
    end
 
    def test_add_anchors
      input = <<-END
        <body>
          <h1 id="toc-hello1">Hello</h1>
          <h1 id="toc-world1">World</h1>
        </body>
      END
 
      expected_output = <<-END
        <body>
          <h1 id="toc-hello2" id="hello_section">Hello</h1>
          <h1 id="toc-world2" id="world_section">World</h1>
        </body>
      END
 
      doc = Hpricot(input)
 
      outliner = HTMLOutliner.new(doc)
      outliner.add_header_anchors!
 
      assert_equal(expected_output, doc.to_s)
    end
 
    def test_add_anchors_with_existing_id
      input = <<-END
        <body>
          <h1 id="toc-hello3" id="moo">Hello</h1>
        </body>
      END
 
      expected_output = <<-END
        <body>
          <h1 id="toc-hello4" id="hello_section">Hello</h1>
        </body>
      END
 
      doc = Hpricot(input)
 
      outliner = HTMLOutliner.new(doc)
      outliner.add_header_anchors!
 
      assert_equal(expected_output, doc.to_s)
    end
 
    def test_add_anchors_with_custom_slugifier
      input = <<-END
        <body>
          <h1 id="toc-hello5">Hello</h1>
        </body>
      END
 
      expected_output = <<-END
        <body>
          <h1 id="toc-hello6" id="chapter1">Hello</h1>
        </body>
      END
 
      doc = Hpricot(input)
 
      outliner = HTMLOutliner.new(doc)
      slugifier = lambda { |x, i, _| "chapter#{i + 1}" }
      outliner.add_header_anchors!(slugifier)
 
      assert_equal(expected_output, doc.to_s)    
    end
 
    def test_outline
      doc = Hpricot(<<-END)
        <body>
          <h1 id="toc-a">A</h1>
          <h1 id="toc-b">B</h1>
          <h2 id="toc-c">C</h2>
          <h3 id="toc-d">D</h3>
          <h2 id="toc-e">E</h2>
        </body>
      END
 
      outline = HTMLOutliner.new(doc).outline
 
      assert_equal 2, outline.size
      assert_equal 0, outline[0].subtrees.size
      assert_equal 2, outline[1].subtrees.size
      assert_equal 1, outline[1].subtrees[0].subtrees.size
      assert_equal 0, outline[1].subtrees[0].subtrees[0].subtrees.size
      assert_equal 0, outline[1].subtrees[1].subtrees.size
 
      assert_equal "A", outline[0].root.inner_html
      assert_equal "B", outline[1].root.inner_html
      assert_equal "C", outline[1].subtrees[0].root.inner_html
      assert_equal "D", outline[1].subtrees[0].subtrees[0].root.inner_html
      assert_equal "E", outline[1].subtrees[1].root.inner_html
    end
 &nbs

Ruby to G Map

Posted on by 
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require ‘csv’ mydata = [] zips = File.open(‘zips.txt’) do |io|
h = {}
io.eachline do |line|
 zip, freq = CSV.parseline line
   h[zip]=freq
end
h
end
File.open(“target.xml”,“w”) do |target| File.open(‘ZIP_CODES.txt’) do |io|
io.eachline do |line|
 rec = CSV.parseline line
 freq = zips[rec[0]] or next
 rec[1,0]=freq
   target.write(“” + “n”)
end