+++ /dev/null
-require 'action_view/erb/util'
-require 'set'
-
-module ActionView
- module Helpers #:nodoc:
- # Provides methods to generate HTML tags programmatically when you can't use
- # a Builder. By default, they output XHTML compliant tags.
- module TagHelper
- include ERB::Util
-
- BOOLEAN_ATTRIBUTES = %w(disabled readonly multiple checked).to_set
- BOOLEAN_ATTRIBUTES.merge(BOOLEAN_ATTRIBUTES.map(&:to_sym))
-
- # Returns an empty HTML tag of type +name+ which by default is XHTML
- # compliant. Set +open+ to true to create an open tag compatible
- # with HTML 4.0 and below. Add HTML attributes by passing an attributes
- # hash to +options+. Set +escape+ to false to disable attribute value
- # escaping.
- #
- # ==== Options
- # The +options+ hash is used with attributes with no value like (<tt>disabled</tt> and
- # <tt>readonly</tt>), which you can give a value of true in the +options+ hash. You can use
- # symbols or strings for the attribute names.
- #
- # ==== Examples
- # tag("br")
- # # => <br />
- #
- # tag("br", nil, true)
- # # => <br>
- #
- # tag("input", { :type => 'text', :disabled => true })
- # # => <input type="text" disabled="disabled" />
- #
- # tag("img", { :src => "open & shut.png" })
- # # => <img src="open & shut.png" />
- #
- # tag("img", { :src => "open & shut.png" }, false, false)
- # # => <img src="open & shut.png" />
- def tag(name, options = nil, open = false, escape = true)
- "<#{name}#{tag_options(options, escape) if options}#{open ? ">" : " />"}"
- end
-
- # Returns an HTML block tag of type +name+ surrounding the +content+. Add
- # HTML attributes by passing an attributes hash to +options+.
- # Instead of passing the content as an argument, you can also use a block
- # in which case, you pass your +options+ as the second parameter.
- # Set escape to false to disable attribute value escaping.
- #
- # ==== Options
- # The +options+ hash is used with attributes with no value like (<tt>disabled</tt> and
- # <tt>readonly</tt>), which you can give a value of true in the +options+ hash. You can use
- # symbols or strings for the attribute names.
- #
- # ==== Examples
- # content_tag(:p, "Hello world!")
- # # => <p>Hello world!</p>
- # content_tag(:div, content_tag(:p, "Hello world!"), :class => "strong")
- # # => <div class="strong"><p>Hello world!</p></div>
- # content_tag("select", options, :multiple => true)
- # # => <select multiple="multiple">...options...</select>
- #
- # <% content_tag :div, :class => "strong" do -%>
- # Hello world!
- # <% end -%>
- # # => <div class="strong">Hello world!</div>
- def content_tag(name, content_or_options_with_block = nil, options = nil, escape = true, &block)
- if block_given?
- options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
- content_tag = content_tag_string(name, capture(&block), options, escape)
-
- if block_called_from_erb?(block)
- concat(content_tag)
- else
- content_tag
- end
- else
- content_tag_string(name, content_or_options_with_block, options, escape)
- end
- end
-
- # Returns a CDATA section with the given +content+. CDATA sections
- # are used to escape blocks of text containing characters which would
- # otherwise be recognized as markup. CDATA sections begin with the string
- # <tt><![CDATA[</tt> and end with (and may not contain) the string <tt>]]></tt>.
- #
- # ==== Examples
- # cdata_section("<hello world>")
- # # => <![CDATA[<hello world>]]>
- #
- # cdata_section(File.read("hello_world.txt"))
- # # => <![CDATA[<hello from a text file]]>
- def cdata_section(content)
- "<![CDATA[#{content}]]>"
- end
-
- # Returns an escaped version of +html+ without affecting existing escaped entities.
- #
- # ==== Examples
- # escape_once("1 < 2 & 3")
- # # => "1 < 2 & 3"
- #
- # escape_once("<< Accept & Checkout")
- # # => "<< Accept & Checkout"
- def escape_once(html)
- html.to_s.gsub(/[\"><]|&(?!([a-zA-Z]+|(#\d+));)/) { |special| ERB::Util::HTML_ESCAPE[special] }
- end
-
- private
- BLOCK_CALLED_FROM_ERB = 'defined? __in_erb_template'
-
- if RUBY_VERSION < '1.9.0'
- # Check whether we're called from an erb template.
- # We'd return a string in any other case, but erb <%= ... %>
- # can't take an <% end %> later on, so we have to use <% ... %>
- # and implicitly concat.
- def block_called_from_erb?(block)
- block && eval(BLOCK_CALLED_FROM_ERB, block)
- end
- else
- def block_called_from_erb?(block)
- block && eval(BLOCK_CALLED_FROM_ERB, block.binding)
- end
- end
-
- def content_tag_string(name, content, options, escape = true)
- tag_options = tag_options(options, escape) if options
- "<#{name}#{tag_options}>#{content}</#{name}>"
- end
-
- def tag_options(options, escape = true)
- unless options.blank?
- attrs = []
- if escape
- options.each_pair do |key, value|
- if BOOLEAN_ATTRIBUTES.include?(key)
- attrs << %(#{key}="#{key}") if value
- else
- attrs << %(#{key}="#{escape_once(value)}") if !value.nil?
- end
- end
- else
- attrs = options.map { |key, value| %(#{key}="#{value}") }
- end
- " #{attrs.sort * ' '}" unless attrs.empty?
- end
- end
- end
- end
-end
projects / feedcatcher.git / blobdiff