From 71ec0edea3f87fb69222dbb6fe025c2211402ca2 Mon Sep 17 00:00:00 2001
From: elijah <elijah@riseup.net>
Date: Tue, 12 Feb 2013 21:33:39 -0800
Subject: added capacity for pulling static pages from multiple directory
 source trees.

---
 lib/menu.rb | 133 +++++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 95 insertions(+), 38 deletions(-)

(limited to 'lib/menu.rb')

diff --git a/lib/menu.rb b/lib/menu.rb
index 71690a4..c156e07 100644
--- a/lib/menu.rb
+++ b/lib/menu.rb
@@ -1,47 +1,45 @@
-class Menu < Array
-  attr_accessor :parent
+#
+# A navigation menu class
+#
 
-  #
-  # class methods
-  #
+class Menu
+  attr_accessor :parent
+  attr_accessor :children
+  attr_accessor :name
 
   #
-  # load the menu.txt file, recursively, and build the in-memory menu array
+  # load the menu.txt file and build the in-memory menu array
   #
-  def self.load(menu_file_path)
-    @menu = Menu.new
+  def load(menu_file_path)
     File.open(menu_file_path) do |file|
-      append_menu_item(@menu, file)
+      parse_menu(file)
     end
   end
 
-  def self.menu
-    @menu || Menu.new
+  def initialize(name, parent=nil)
+    self.name = name
+    self.parent = parent
+    self.children = []
   end
 
-  def self.create(elements=[], parent=nil)
-    menu = Menu[elements]
-    menu.parent = parent
-    return menu
-  end
+  ##
+  ## public methods
+  ##
 
   #
-  # public methods
+  # returns the menu under the item that matches item_name.
   #
-
   def submenu(item_name=nil)
     if item_name
-      submenu = detect {|item| item[0] == item_name} || Menu.new
+      self.children.detect {|child| child.name == item_name} || Menu.new
     else
-      submenu = self
+      self.children
     end
-    return submenu[1..-1] # strip of first element
-  end
-
-  def name
-    first
   end
 
+  #
+  # returns path from root to this leaf as an array
+  #
   def path
     @path ||= begin
       if parent == nil
@@ -52,27 +50,86 @@ class Menu < Array
     end
   end
 
+  def each(&block)
+    children.each(&block)
+  end
+
+  def size
+    children.size
+  end
+
+  #
+  # returns true if menu's path starts with +path_prefix+
+  #
+  def path_starts_with?(path_prefix)
+    array_starts_with?(path, path_prefix)
+  end
+
+  def path_prefix_of?(full_path)
+    array_starts_with?(full_path, path)
+  end
+
+  #
+  # returns true if this menu item is the terminus menu item for path.
+  # (meaning that there are no children that match more path segments)
+  #
+  def leaf_for_path?(path)
+    return false unless path_prefix_of?(path)
+    next_path_segment = (path - self.path).first
+    return false if next_path_segment.nil?
+    return !children.detect {|i| i.name == next_path_segment}
+  end
+
+  def inspect(indent=0)
+    lines = []
+    lines << '  '*indent + '- ' + self.name
+    self.children.each do |child|
+      lines << child.inspect(indent+1)
+    end
+    lines.join("\n")
+  end
+
+  #
+  # private & protected methods
+  #
+
+  protected
+
+  def add_child(name)
+    self.children << Menu.new(name, self)
+  end
+
   private
 
-  def self.append_menu_item(menu, file)
-    begin
+  def array_starts_with?(big_array, small_array)
+    small_array.length.times do |i|
+      if small_array[i] != big_array[i]
+        return false
+      end
+    end
+    return true
+  end
+
+
+  def parse_menu(file)
+    while true
       item = file.readline
-    rescue EOFError
-      # do nothing
-    else
-      if item !~ /^\s*#/
+      if item.strip.chars.any? && item !~ /^\s*#/
         depth = item.scan("  ").size
-        sub_menu = sub_menu_for_depth(menu, depth)
-        sub_menu << Menu.create(item.strip, sub_menu)
+        last_menu_at_depth(depth).add_child(item.strip)
       end
-      append_menu_item(menu, file)
     end
+  rescue EOFError
+    # done loading
   end
 
-  def self.sub_menu_for_depth(menu, depth)
-    sub_menu = menu
-    depth.times { sub_menu = sub_menu[-1] }
-    sub_menu
+  #
+  # returns the last list of children at the specified depth
+  #
+  def last_menu_at_depth(depth)
+    menu = self
+    depth.times { menu = menu.children.last }
+    menu
   end
 
 end
\ No newline at end of file
-- 
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