Class: Anaximander::Renderer

Inherits:
Object
  • Object
show all
Defined in:
lib/anaximander/renderer.rb

Overview

Draws the crawled tree of URLs and assets, generated by ‘Anaximander::Crawler`.

Output

└── <url> [assets]
    ├── <url> [assets]
    │   └── <url> [assets]
    └── <url> [assets]

Example

root
# => #<Anaximander::Page url="http://example.com"/>

root.children
# => [#<Anaximander::Page url="http://example.com/foo"/>, #<Anaximander::Page url="http://example.com"/bar>]

renderer = Anaximander::Renderer.new(root)
renderer.draw

# => └── http://example.com [main.css]
# =>     ├── http://example.com/foo [main.css, foo.js]
# =>     └── http://example.com/bar [main.css, bar.js]

Constant Summary collapse

VERTICAL_PIPE = 
"│   "
MEMBER_PIPE = 
"├── "
TAIL_PIPE = 
"└── "
SPACE_PIPE = 
"    "

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Renderer

Returns a new instance of Renderer.



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# File 'lib/anaximander/renderer.rb', line 36

def initialize(options={})
  @color = options.fetch(:color, true)
end

Instance Attribute Details

#root ⇒ Object (readonly)

Returns the value of attribute root.



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# File 'lib/anaximander/renderer.rb', line 34

def root
  @root
end

Instance Method Details

#draw(page = self.root, prefix = "", tail = true) ⇒ Object

Draws a page URL, its assets and recursively does the same for all of its children.

Parameters

[Anaximander::Page] page The page to render
[String] prefix A string that should preceed the actual URLa
                and asset information.
[Boolean] tail Is this node the last one in the collection.



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# File 'lib/anaximander/renderer.rb', line 50

def draw(page=self.root, prefix="", tail=true)
  pipe = tail ? TAIL_PIPE : MEMBER_PIPE

  url    = "#{prefix}#{pipe}#{page.url} "
  assets = "#{page.assets.to_a}"
  assets = assets.colorize(:light_black) if @color

  print url
  puts assets

  page.children[0..-2].each { |child| draw_child(child, prefix, tail) }
  draw_tail(page.children.last, prefix, tail) if page.children.size >= 1
end

#draw_child(page, prefix, parent_is_tail) ⇒ Object

Draws a child node, with the appropriate “connecting pipe”.

The “connecting pipe” is the character at the beginning of this line, which connects this to the previous tier of the tree.



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# File 'lib/anaximander/renderer.rb', line 69

def draw_child(page, prefix, parent_is_tail)
  connecting_pipe = parent_is_tail ? SPACE_PIPE : VERTICAL_PIPE
  draw(page, "#{prefix}#{connecting_pipe}", false)
end

#draw_tail(page, prefix, parent_is_tail) ⇒ Object

Draws a leaf node, with the appropriate “connecting pipe”.

See ‘draw_child` for “connecting pipe” definition.



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# File 'lib/anaximander/renderer.rb', line 78

def draw_tail(page, prefix, parent_is_tail)
  connecting_pipe = parent_is_tail ? SPACE_PIPE : VERTICAL_PIPE
  draw(page, "#{prefix}#{connecting_pipe}", true)
end