Class: ViewScope

Inherits:
Object show all
Includes:
AttributeScope
Defined in:
lib/volt/server/html_parser/view_scope.rb

Direct Known Subclasses

EachScope, IfViewScope, TextareaScope

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from AttributeScope

#add_id_to_attributes, #add_multiple_attribute, #add_single_attribute, #add_string_template_renderer, #attribute_string, #getter_to_setter, #process_attribute, #process_attributes, #process_event_binding

Constructor Details

#initialize(handler, path) ⇒ ViewScope

Returns a new instance of ViewScope.



9
10
11
12
13
14
15
16
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 9

def initialize(handler, path)
  @handler = handler
  @path = path

  @html = ''
  @bindings = {}
  @binding_number = 0
end

Instance Attribute Details

#binding_number ⇒ Object

Returns the value of attribute binding_number.



7
8
9
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 7

def binding_number
  @binding_number
end

#bindings ⇒ Object (readonly)

Returns the value of attribute bindings.



6
7
8
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 6

def bindings
  @bindings
end

#html ⇒ Object (readonly)

Returns the value of attribute html.



6
7
8
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 6

def html
  @html
end

#path ⇒ Object

Returns the value of attribute path.



7
8
9
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 7

def path
  @path
end

Instance Method Details

#<<(html) ⇒ Object 



18
19
20
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 18

def <<(html)
  @html << html
end

#add_binding(content) ⇒ Object 



22
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
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 22

def add_binding(content)
  content = content.strip
  index = content.index(/[ \(]/)
  if index
    first_symbol = content[0...index]
    args = content[index..-1].strip

    case first_symbol
    when 'if'
      add_if(args)
    when 'elsif'
      add_else(args)
    when 'else'
      if args.blank?
        add_else(nil)
      else
        raise "else does not take a conditional, #{content} was provided."
      end
    when 'template'
      add_template(args)
    else
      if content =~ /.each\s+do\s+\|/
        add_each(content)
      else
        add_content_binding(content)
      end
    end
  else
    case content
    when 'end'
      # Close the binding
      close_scope
    when 'else'
      add_else(nil)
    else
      add_content_binding(content)
    end
  end
end

#add_component(tag_name, attributes, unary) ⇒ Object 



108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 108

def add_component(tag_name, attributes, unary)
  component_name = tag_name[1..-1].gsub(':', '/')

  @handler.html << "<!-- $#{@binding_number} --><!-- $/#{@binding_number} -->"

  data_hash = []
  attributes.each_pair do |name, value|
    parts = value.split(/(\{\{[^\}]+\}\})/).reject(&:blank?)
    binding_count = parts.count {|p| p[0] == '{' && p[1] == '{' && p[-2] == '}' && p[-1] == '}'}

    # if this attribute has bindings
    if binding_count > 0
      if binding_count > 1
        # Multiple bindings
      elsif parts.size == 1 && binding_count == 1
        # A single binding
        getter = value[2...-2].strip
        data_hash << "#{name.inspect} => Proc.new { #{getter} }"

        setter = getter_to_setter(getter)
        data_hash << "#{(name + "=").inspect} => Proc.new { |val| #{setter} }"

        # Add an _parent fetcher.  Useful for things like volt-fields to get the parent model.
        parent = parent_fetcher(getter)

        # TODO: This adds some overhead, perhaps there is a way to compute this dynamically on the
        # front-end.
        data_hash << "#{(name + "_parent").inspect} => Proc.new { #{parent} }"

        # Add a _last_method property.  This is useful
        data_hash << "#{(name + "_last_method").inspect} => #{last_method_name(getter).inspect}"
      end
    else
      # String
      data_hash << "#{name.inspect} => #{value.inspect}"
    end
  end

  arguments = "#{component_name.inspect}, { #{data_hash.join(',')} }"

  save_binding(@binding_number, "lambda { |__p, __t, __c, __id| ComponentBinding.new(__p, __t, __c, __id, #{@path.inspect}, Proc.new { [#{arguments}] }) }")

  @binding_number += 1
end

#add_content_binding(content) ⇒ Object 



62
63
64
65
66
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 62

def add_content_binding(content)
  @handler.html << "<!-- $#{@binding_number} --><!-- $/#{@binding_number} -->"
  save_binding(@binding_number, "lambda { |__p, __t, __c, __id| ContentBinding.new(__p, __t, __c, __id, Proc.new { #{content} }) }")
  @binding_number += 1
end

#add_each(content) ⇒ Object 



78
79
80
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 78

def add_each(content)
  @handler.scope << EachScope.new(@handler, @path + "/__each#{@binding_number}", content)
end

#add_else(content) ⇒ Object 



74
75
76
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 74

def add_else(content)
  raise "#else can only be added inside of an if block"
end

#add_if(content) ⇒ Object 



68
69
70
71
72
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 68

def add_if(content)
  # Add with path for if group.
  @handler.scope << IfViewScope.new(@handler, @path + "/__ifg#{@binding_number}", content)
  @binding_number += 1
end

#add_template(content) ⇒ Object 



82
83
84
85
86
87
88
89
90
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 82

def add_template(content)
  # Strip ( and ) from the outsides
  content = content.strip.gsub(/^\(/, '').gsub(/\)$/, '')

  @handler.html << "<!-- $#{@binding_number} --><!-- $/#{@binding_number} -->"
  save_binding(@binding_number, "lambda { |__p, __t, __c, __id| TemplateBinding.new(__p, __t, __c, __id, #{@path.inspect}, Proc.new { [#{content}] }) }")

  @binding_number += 1
end

#add_textarea(tag_name, attributes, unary) ⇒ Object 



153
154
155
156
157
158
159
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 153

def add_textarea(tag_name, attributes, unary)
  @handler.scope << TextareaScope.new(@handler, @path + "/__txtarea#{@binding_number}", attributes)
  @binding_number += 1

  # close right away if unary
  @handler.last.close_scope if unary
end

#close_scope(pop = true) ⇒ Object

Called when this scope should be closed out



162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 162

def close_scope(pop=true)
  if pop
    scope = @handler.scope.pop
  else
    scope = @handler.last
  end

  raise "template path already exists: #{scope.path}" if @handler.templates[scope.path]

  template = {
    'html' => scope.html
  }

  if scope.bindings.size > 0
    # Add the bindings if there are any
    template['bindings'] = scope.bindings
  end

  @handler.templates[scope.path] = template
end

#last_method_name(getter) ⇒ Object 



104
105
106
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 104

def last_method_name(getter)
  return getter.strip[/[^.]+$/]
end

#parent_fetcher(getter) ⇒ Object

Returns ruby code to fetch the parent. (by removing the last fetch) TODO: Probably want to do this with AST transforms with the parser/unparser gems



94
95
96
97
98
99
100
101
102
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 94

def parent_fetcher(getter)
  parent = getter.strip.gsub(/[.][^.]+$/, '')

  if parent.blank? || !getter.index('.')
    parent = 'self'
  end

  return parent
end

#save_binding(binding_number, code) ⇒ Object 



183
184
185
186
 
# File 'lib/volt/server/html_parser/view_scope.rb', line 183

def save_binding(binding_number, code)
  @bindings[binding_number] ||= []
  @bindings[binding_number] << code
end