104 lines
4.2 KiB
Ruby
104 lines
4.2 KiB
Ruby
require 'cgi'
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require 'erb'
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module ActionView
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module Helpers #:nodoc:
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# Use these methods to generate HTML tags programmatically when you can't use
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# a Builder. By default, they output XHTML compliant tags.
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module TagHelper
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include ERB::Util
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# Returns an empty HTML tag of type +name+ which by default is XHTML
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# compliant. Setting +open+ to true will create an open tag compatible
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# with HTML 4.0 and below. Add HTML attributes by passing an attributes
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# hash to +options+. For attributes with no value like (disabled and
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# readonly), give it a value of true in the +options+ hash. You can use
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# symbols or strings for the attribute names.
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#
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# tag("br")
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# # => <br />
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# tag("br", nil, true)
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# # => <br>
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# tag("input", { :type => 'text', :disabled => true })
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# # => <input type="text" disabled="disabled" />
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def tag(name, options = nil, open = false)
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"<#{name}#{tag_options(options) if options}" + (open ? ">" : " />")
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end
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# Returns an HTML block tag of type +name+ surrounding the +content+. Add
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# HTML attributes by passing an attributes hash to +options+. For attributes
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# with no value like (disabled and readonly), give it a value of true in
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# the +options+ hash. You can use symbols or strings for the attribute names.
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#
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# content_tag(:p, "Hello world!")
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# # => <p>Hello world!</p>
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# content_tag(:div, content_tag(:p, "Hello world!"), :class => "strong")
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# # => <div class="strong"><p>Hello world!</p></div>
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# content_tag("select", options, :multiple => true)
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# # => <select multiple="multiple">...options...</select>
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#
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# Instead of passing the content as an argument, you can also use a block
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# in which case, you pass your +options+ as the second parameter.
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#
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# <% content_tag :div, :class => "strong" do -%>
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# Hello world!
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# <% end -%>
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# # => <div class="strong"><p>Hello world!</p></div>
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def content_tag(name, content_or_options_with_block = nil, options = nil, &block)
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if block_given?
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options = content_or_options_with_block if content_or_options_with_block.is_a?(Hash)
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content = capture(&block)
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concat(content_tag_string(name, content, options), block.binding)
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else
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content = content_or_options_with_block
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content_tag_string(name, content, options)
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end
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end
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# Returns a CDATA section with the given +content+. CDATA sections
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# are used to escape blocks of text containing characters which would
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# otherwise be recognized as markup. CDATA sections begin with the string
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# <tt><![CDATA[</tt> and end with (and may not contain) the string <tt>]]></tt>.
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#
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# cdata_section("<hello world>")
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# # => <![CDATA[<hello world>]]>
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def cdata_section(content)
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"<![CDATA[#{content}]]>"
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end
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# Returns the escaped +html+ without affecting existing escaped entities.
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#
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# escape_once("1 > 2 & 3")
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# # => "1 < 2 & 3"
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def escape_once(html)
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fix_double_escape(html_escape(html.to_s))
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end
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private
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def content_tag_string(name, content, options)
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tag_options = options ? tag_options(options) : ""
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"<#{name}#{tag_options}>#{content}</#{name}>"
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end
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def tag_options(options)
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cleaned_options = convert_booleans(options.stringify_keys.reject {|key, value| value.nil?})
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' ' + cleaned_options.map {|key, value| %(#{key}="#{escape_once(value)}")}.sort * ' ' unless cleaned_options.empty?
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end
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def convert_booleans(options)
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%w( disabled readonly multiple ).each { |a| boolean_attribute(options, a) }
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options
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end
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def boolean_attribute(options, attribute)
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options[attribute] ? options[attribute] = attribute : options.delete(attribute)
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end
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# Fix double-escaped entities, such as &amp;, &#123;, etc.
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def fix_double_escape(escaped)
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escaped.gsub(/&([a-z]+|(#\d+));/i) { "&#{$1};" }
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end
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end
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end
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end
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