Class: Celerity::ElementLocator

Inherits:
Object
  • Object
show all
Includes:
Exception
Defined in:
lib/celerity/element_locator.rb

Overview

Used internally to locate elements on the page.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(container, element_class) ⇒ ElementLocator

Returns a new instance of ElementLocator.



12
13
14
15
16
17
18
19
20
21
 
# File 'lib/celerity/element_locator.rb', line 12

def initialize(container, element_class)
  container.assert_exists

  @container     = container
  @object        = container.object
  @element_class = element_class
  @attributes    = @element_class::ATTRIBUTES # could check for 'strict' here?
  @idents        = @element_class::TAGS
  @tags          = @idents.map { |e| e.tag.downcase }
end

Instance Attribute Details

#idents ⇒ Object

Returns the value of attribute idents.



9
10
11
 
# File 'lib/celerity/element_locator.rb', line 9

def idents
  @idents
end

Instance Method Details

#element_by_idents(idents = @idents) ⇒ Object 



118
119
120
 
# File 'lib/celerity/element_locator.rb', line 118

def element_by_idents(idents = @idents)
  get_by_idents(:find, idents)
end

#elements_by_idents(idents = @idents) ⇒ Object 



114
115
116
 
# File 'lib/celerity/element_locator.rb', line 114

def elements_by_idents(idents = @idents)
  get_by_idents(:select, idents)
end

#find_by_conditions(conditions) ⇒ Object

TODO: refactor without performance hit



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/celerity/element_locator.rb', line 23

def find_by_conditions(conditions) # TODO: refactor without performance hit
  return nil unless @object # probably means we're on a TextPage (content-type is "text/plain")

  @condition_idents = []
  attributes = Hash.new { |h, k| h[k] = [] }
  index = 0 # by default, return the first matching element
  text = nil

  conditions.each do |how, what|
    case how
    when :object
      unless what.is_a?(HtmlUnit::Html::HtmlElement) || what.nil?
        raise ArgumentError, "expected an HtmlUnit::Html::HtmlElement subclass, got #{what.inspect}:#{what.class}"
      end
      return what
    when :xpath
      return find_by_xpath(what)
    when :label
      return find_by_label(what) unless @attributes.include?(:label)
    when :class_name
      how = :class
    when :url
      how = :href
    when :caption
      how = :text
    end

    if how == :id && conditions.size == 1
      return find_by_id(what)
    elsif @attributes.include?(how = how.to_sym)
      attributes[how] << what
    elsif how == :index
      index = what.to_i - Celerity.index_offset
    elsif how == :text
      text = what
    else
      raise MissingWayOfFindingObjectException, "No how #{how.inspect}"
    end
  end

  @idents.each do |ident|
    merged = attributes.merge(ident.attributes) { |key, v1, v2| v1 | v2 }
    id = Identifier.new(ident.tag, merged)
    id.text = ident.text || text # «original» identifier takes precedence for :text
    @condition_idents << id
  end

  if index == 0
    element_by_idents(@condition_idents)
  else
    elements_by_idents(@condition_idents)[index]
  end

rescue HtmlUnit::ElementNotFoundException
  nil # for rcov
end

#find_by_id(what) ⇒ Object 



80
81
82
83
84
85
86
87
88
89
90
91
92
93
 
# File 'lib/celerity/element_locator.rb', line 80

def find_by_id(what)
  case what
  when Regexp
    elements_by_tag_names.find { |elem| elem.getId =~ what }
  when String
    obj = @object.getElementById(what)
    return obj if @tags.include?(obj.getTagName)

    $stderr.puts "warning: multiple elements with identical id? (#{what.inspect})" if $VERBOSE
    elements_by_tag_names.find { |elem| elem.getId == what }
  else
    raise TypeError, "expected String or Regexp, got #{what.inspect}:#{what.class}"
  end
end

#find_by_label(what) ⇒ Object 



105
106
107
108
109
110
111
112
 
# File 'lib/celerity/element_locator.rb', line 105

def find_by_label(what)
  obj = elements_by_tag_names(%w[label]).find { |e| Util.matches?(e.asText, what) }

  return nil unless obj && (ref = obj.getReferencedElement)
  return ref if @tags.include?(ref.getTagName)

  find_by_id obj.getForAttribute
end

#find_by_xpath(what) ⇒ Object 



95
96
97
98
99
100
101
102
103
 
# File 'lib/celerity/element_locator.rb', line 95

def find_by_xpath(what)
  what = ".#{what}" if what[0].chr == "/"
  object = @object.getByXPath(what).to_a.first || return
  
  return unless @idents.any? { |id| id.match?(object) }
  
  
  object
end