Class: ActionView::Helpers::TagHelper::TagBuilder

Inherits:
Object
  • Object
show all
Includes:
CaptureHelper, OutputSafetyHelper
Defined in:
actionview/lib/action_view/helpers/tag_helper.rb

Overview

:nodoc:

Constant Summary collapse

HTML_VOID_ELEMENTS =
%i(area base br col embed hr img input keygen link meta param source track wbr).to_set
SVG_SELF_CLOSING_ELEMENTS =
%i(animate animateMotion animateTransform circle ellipse line path polygon polyline rect set stop use view).to_set

Instance Method Summary collapse

Methods included from OutputSafetyHelper

#raw, #safe_join, #to_sentence

Methods included from CaptureHelper

#capture, #content_for, #content_for?, #provide, #with_output_buffer

Constructor Details

#initialize(view_context) ⇒ TagBuilder

Returns a new instance of TagBuilder.



52
53
54
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 52

def initialize(view_context)
  @view_context = view_context
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(called, *args, **options, &block) ⇒ Object (private)



166
167
168
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 166

def method_missing(called, *args, **options, &block)
  tag_string(called, *args, **options, &block)
end

Instance Method Details

#attributes(attributes) ⇒ Object

Transforms a Hash into HTML Attributes, ready to be interpolated into ERB.

<input <%= tag.attributes(type: :text, aria: { label: "Search" }) %> >
# => <input type="text" aria-label="Search">


61
62
63
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 61

def attributes(attributes)
  tag_options(attributes.to_h).to_s.strip.html_safe
end

#boolean_tag_option(key) ⇒ Object



132
133
134
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 132

def boolean_tag_option(key)
  %(#{key}="#{key}")
end

#content_tag_string(name, content, options, escape = true) ⇒ Object



79
80
81
82
83
84
85
86
87
88
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 79

def (name, content, options, escape = true)
  tag_options = tag_options(options, escape) if options

  if escape
    name = ERB::Util.xml_name_escape(name)
    content = ERB::Util.unwrapped_html_escape(content)
  end

  "<#{name}#{tag_options}>#{PRE_CONTENT_STRINGS[name]}#{content}</#{name}>".html_safe
end

#p(*arguments, **options, &block) ⇒ Object



65
66
67
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 65

def p(*arguments, **options, &block)
  tag_string(:p, *arguments, **options, &block)
end

#tag_option(key, value, escape) ⇒ Object



136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 136

def tag_option(key, value, escape)
  key = ERB::Util.xml_name_escape(key) if escape

  case value
  when Array, Hash
    value = TagHelper.build_tag_values(value) if key.to_s == "class"
    value = escape ? safe_join(value, " ") : value.join(" ")
  when Regexp
    value = escape ? ERB::Util.unwrapped_html_escape(value.source) : value.source
  else
    value = escape ? ERB::Util.unwrapped_html_escape(value) : value.to_s
  end
  value = value.gsub('"', "&quot;") if value.include?('"')

  %(#{key}="#{value}")
end

#tag_options(options, escape = true) ⇒ Object



90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 90

def tag_options(options, escape = true)
  return if options.blank?
  output = +""
  sep    = " "
  options.each_pair do |key, value|
    type = TAG_TYPES[key]
    if type == :data && value.is_a?(Hash)
      value.each_pair do |k, v|
        next if v.nil?
        output << sep
        output << prefix_tag_option(key, k, v, escape)
      end
    elsif type == :aria && value.is_a?(Hash)
      value.each_pair do |k, v|
        next if v.nil?

        case v
        when Array, Hash
          tokens = TagHelper.build_tag_values(v)
          next if tokens.none?

          v = safe_join(tokens, " ")
        else
          v = v.to_s
        end

        output << sep
        output << prefix_tag_option(key, k, v, escape)
      end
    elsif type == :boolean
      if value
        output << sep
        output << boolean_tag_option(key)
      end
    elsif !value.nil?
      output << sep
      output << tag_option(key, value, escape)
    end
  end
  output unless output.empty?
end

#tag_string(name, content = nil, escape: true, **options, &block) ⇒ Object



69
70
71
72
73
74
75
76
77
# File 'actionview/lib/action_view/helpers/tag_helper.rb', line 69

def tag_string(name, content = nil, escape: true, **options, &block)
  content = @view_context.capture(self, &block) if block_given?
  self_closing = SVG_SELF_CLOSING_ELEMENTS.include?(name)
  if (HTML_VOID_ELEMENTS.include?(name) || self_closing) && content.nil?
    "<#{name.to_s.dasherize}#{tag_options(options, escape)}#{self_closing ? " />" : ">"}".html_safe
  else
    (name.to_s.dasherize, content || "", options, escape)
  end
end