Module | Haml::Helpers |
In: |
lib/haml/helpers.rb
lib/haml/helpers/action_view_extensions.rb |
This module contains various helpful methods to make it easier to do various tasks. {Haml::Helpers} is automatically included in the context that a Haml template is parsed in, so all these methods are at your disposal from within the template.
HTML_ESCAPE | = | { '&'=>'&', '<'=>'<', '>'=>'>', '"'=>'"', "'"=>''', } | Characters that need to be escaped to HTML entities from user input |
@return [Boolean] Whether or not ActionView is loaded
# File lib/haml/helpers.rb, line 40 40: def self.action_view? 41: @@action_view_defined 42: end
Returns whether or not `block` is defined directly in a Haml template.
@param block [Proc] A Ruby block @return [Boolean] Whether or not `block` is defined directly in a Haml template
# File lib/haml/helpers.rb, line 490 490: def block_is_haml?(block) 491: eval('_hamlout', block.binding) 492: true 493: rescue 494: false 495: end
Captures the result of a block of Haml code, gets rid of the excess indentation, and returns it as a string. For example, after the following,
.foo - foo = capture_haml(13) do |a| %p= a
the local variable `foo` would be assigned to `"<p>13</p>\n"`.
@param args [Array] Arguments to pass into the block @yield [args] A block of Haml code that will be converted to a string @yieldparam args [Array] `args`
# File lib/haml/helpers.rb, line 300 300: def capture_haml(*args, &block) 301: buffer = eval('_hamlout', block.binding) rescue haml_buffer 302: with_haml_buffer(buffer) do 303: position = haml_buffer.buffer.length 304: 305: haml_buffer.capture_position = position 306: block.call(*args) 307: 308: captured = haml_buffer.buffer.slice!(position..-1).split(/^/) 309: 310: min_tabs = nil 311: captured.each do |line| 312: tabs = line.index(/[^ ]/) || line.length 313: min_tabs ||= tabs 314: min_tabs = min_tabs > tabs ? tabs : min_tabs 315: end 316: 317: captured.map do |line| 318: line[min_tabs..-1] 319: end.join 320: end 321: ensure 322: haml_buffer.capture_position = nil 323: end
Escapes HTML entities in `text`, but without escaping an ampersand that is already part of an escaped entity.
@param text [String] The string to sanitize @return [String] The sanitized string
# File lib/haml/helpers.rb, line 471 471: def escape_once(text) 472: text.to_s.gsub(/[\"><]|&(?!([a-zA-Z]+|(#\d+));)/) { |s| HTML_ESCAPE[s] } 473: end
Uses \{preserve} to convert any newlines inside whitespace-sensitive tags into the HTML entities for endlines.
@param tags [Array<String>] Tags that should have newlines escaped
@overload find_and_preserve(input, tags = haml_buffer.options[:preserve])
Escapes newlines within a string. @param input [String] The string within which to escape newlines
@overload find_and_preserve(tags = haml_buffer.options[:preserve])
Escapes newlines within a block of Haml code. @yield The block within which to escape newlines
# File lib/haml/helpers.rb, line 95 95: def find_and_preserve(input = nil, tags = haml_buffer.options[:preserve], &block) 96: return find_and_preserve(capture_haml(&block), input || tags) if block 97: 98: input = input.to_s 99: input.gsub(/<(#{tags.map(&Regexp.method(:escape)).join('|')})([^>]*)>(.*?)(<\/\1>)/im) do 100: "<#{$1}#{$2}>#{preserve($3)}</#{$1}>" 101: end 102: end
@return [String] The indentation string for the current line
# File lib/haml/helpers.rb, line 346 346: def haml_indent 347: ' ' * haml_buffer.tabulation 348: end
Creates an HTML tag with the given name and optionally text and attributes. Can take a block that will run between the opening and closing tags. If the block is a Haml block or outputs text using \{haml_concat}, the text will be properly indented.
`flags` is a list of symbol flags like those that can be put at the end of a Haml tag (`:/`, `:<`, and `:>`). Currently, only `:/` and `:<` are supported.
`haml_tag` outputs directly to the buffer; its return value should not be used. If you need to get the results as a string, use \{capture_haml\}.
For example,
haml_tag :table do haml_tag :tr do haml_tag :td, {:class => 'cell'} do haml_tag :strong, "strong!" haml_concat "data" end haml_tag :td do haml_concat "more_data" end end end
outputs
<table> <tr> <td class='cell'> <strong> strong! </strong> data </td> <td> more_data </td> </tr> </table>
@param name [to_s] The name of the tag @param flags [Array<Symbol>] Haml end-of-tag flags
@overload haml_tag(name, *flags, attributes = {})
@yield The block of Haml code within the tag
@overload haml_tag(name, text, *flags, attributes = {})
@param text [#to_s] The text within the tag
# File lib/haml/helpers.rb, line 402 402: def haml_tag(name, *rest, &block) 403: ret = ErrorReturn.new("haml_tag outputs directly to the Haml template.\nDisregard its return value and use the - operator,\nor use capture_haml to get the value as a String.\n") 404: 405: name = name.to_s 406: text = rest.shift.to_s unless [Symbol, Hash, NilClass].any? {|t| rest.first.is_a? t} 407: flags = [] 408: flags << rest.shift while rest.first.is_a? Symbol 409: attributes = Haml::Precompiler.build_attributes(haml_buffer.html?, 410: haml_buffer.options[:attr_wrapper], 411: rest.shift || {}) 412: 413: if text.nil? && block.nil? && (haml_buffer.options[:autoclose].include?(name) || flags.include?(:/)) 414: haml_concat "<#{name}#{attributes} />" 415: return ret 416: end 417: 418: if flags.include?(:/) 419: raise Error.new("Self-closing tags can't have content.") if text 420: raise Error.new("Illegal nesting: nesting within a self-closing tag is illegal.") if block 421: end 422: 423: tag = "<#{name}#{attributes}>" 424: if block.nil? 425: tag << text.to_s << "</#{name}>" 426: haml_concat tag 427: return ret 428: end 429: 430: if text 431: raise Error.new("Illegal nesting: content can't be both given to haml_tag :#{name} and nested within it.") 432: end 433: 434: if flags.include?(:<) 435: tag << capture_haml(&block).strip << "</#{name}>" 436: haml_concat tag 437: return ret 438: end 439: 440: haml_concat tag 441: tab_up 442: block.call 443: tab_down 444: haml_concat "</#{name}>" 445: 446: ret 447: end
Returns a hash containing default assignments for the `xmlns`, `lang`, and `xml:lang` attributes of the `html` HTML element. For example,
%html{html_attrs}
becomes
<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en-US' lang='en-US'>
@param lang [String] The value of `xml:lang` and `lang` @return [Hash<to_s, String>] The attribute hash
# File lib/haml/helpers.rb, line 186 186: def html_attrs(lang = 'en-US') 187: {:xmlns => "http://www.w3.org/1999/xhtml", 'xml:lang' => lang, :lang => lang} 188: end
Returns a copy of `text` with ampersands, angle brackets and quotes escaped into HTML entities.
@param text [String] The string to sanitize @return [String] The sanitized string
# File lib/haml/helpers.rb, line 462 462: def html_escape(text) 463: text.to_s.gsub(/[\"><&]/) { |s| HTML_ESCAPE[s] } 464: end
Note: this does *not* need to be called when using Haml helpers normally in Rails.
Initializes the current object as though it were in the same context as a normal ActionView instance using Haml. This is useful if you want to use the helpers in a context other than the normal setup with ActionView. For example:
context = Object.new class << context include Haml::Helpers end context.init_haml_helpers context.haml_tag :p, "Stuff"
# File lib/haml/helpers.rb, line 60 60: def init_haml_helpers 61: @haml_buffer = Haml::Buffer.new(@haml_buffer, Haml::Engine.new('').send(:options_for_buffer)) 62: nil 63: end
Returns whether or not the current template is a Haml template.
This function, unlike other {Haml::Helpers} functions, also works in other `ActionView` templates, where it will always return false.
@return [Boolean] Whether or not the current template is a Haml template
# File lib/haml/helpers.rb, line 482 482: def is_haml? 483: !@haml_buffer.nil? && @haml_buffer.active? 484: end
Takes an `Enumerable` object and a block and iterates over the enum, yielding each element to a Haml block and putting the result into `<li>` elements. This creates a list of the results of the block. For example:
= list_of([['hello'], ['yall']]) do |i| = i[0]
Produces:
<li>hello</li> <li>yall</li>
And
= list_of({:title => 'All the stuff', :description => 'A book about all the stuff.'}) do |key, val| %h3= key.humanize %p= val
Produces:
<li> <h3>Title</h3> <p>All the stuff</p> </li> <li> <h3>Description</h3> <p>A book about all the stuff.</p> </li>
@param enum [Enumerable] The list of objects to iterate over @yield [item] A block which contains Haml code that goes within list items @yieldparam item An element of `enum`
# File lib/haml/helpers.rb, line 158 158: def list_of(enum, &block) 159: to_return = enum.collect do |i| 160: result = capture_haml(i, &block) 161: 162: if result.count("\n") > 1 163: result.gsub!("\n", "\n ") 164: result = "\n #{result.strip}\n" 165: else 166: result.strip! 167: end 168: 169: "<li>#{result}</li>" 170: end 171: to_return.join("\n") 172: end
Runs a block of code in a non-Haml context (i.e. \{is_haml?} will return false).
This is mainly useful for rendering sub-templates such as partials in a non-Haml language, particularly where helpers may behave differently when run from Haml.
Note that this is automatically applied to Rails partials.
@yield A block which won‘t register as Haml
# File lib/haml/helpers.rb, line 74 74: def non_haml 75: was_active = @haml_buffer.active? 76: @haml_buffer.active = false 77: yield 78: ensure 79: @haml_buffer.active = was_active 80: end
Prepends a string to the beginning of a Haml block, with no whitespace between. For example:
= precede '*' do %span.small Not really
Produces:
*<span class='small'>Not really</span>
@param str [String] The string to add before the Haml @yield A block of Haml to prepend to
# File lib/haml/helpers.rb, line 263 263: def precede(str, &block) 264: "#{str}#{capture_haml(&block).chomp}\n" 265: end
Takes any string, finds all the newlines, and converts them to HTML entities so they‘ll render correctly in whitespace-sensitive tags without screwing up the indentation.
@overload perserve(input)
Escapes newlines within a string. @param input [String] The string within which to escape all newlines
@overload perserve
Escapes newlines within a block of Haml code. @yield The block within which to escape newlines
# File lib/haml/helpers.rb, line 116 116: def preserve(input = '', &block) 117: return preserve(capture_haml(&block)) if block 118: 119: input.chomp("\n").gsub(/\n/, '
').gsub(/\r/, '') 120: end
@deprecated This will be removed in version 2.4. @see \{haml_concat}
# File lib/haml/helpers.rb, line 327 327: def puts(*args) 328: warn "DEPRECATION WARNING:\nThe Haml #puts helper is deprecated and will be removed in version 2.4.\nUse the #haml_concat helper instead.\n" 329: haml_concat(*args) 330: end
Appends a string to the end of a Haml block, with no whitespace between. For example:
click = succeed '.' do %a{:href=>"thing"} here
Produces:
click <a href='thing'>here</a>.
@param str [String] The string to add after the Haml @yield A block of Haml to append to
# File lib/haml/helpers.rb, line 282 282: def succeed(str, &block) 283: "#{capture_haml(&block).chomp}#{str}\n" 284: end
Surrounds a block of Haml code with strings, with no whitespace in between. For example:
= surround '(', ')' do %a{:href => "food"} chicken
Produces:
(<a href='food'>chicken</a>)
and
= surround '*' do %strong angry
Produces:
*<strong>angry</strong>*
@param front [String] The string to add before the Haml @param back [String] The string to add after the Haml @yield A block of Haml to surround
# File lib/haml/helpers.rb, line 244 244: def surround(front, back = front, &block) 245: output = capture_haml(&block) 246: 247: "#{front}#{output.chomp}#{back}\n" 248: end
Increments the number of tabs the buffer automatically adds to the lines of the template. For example:
%h1 foo - tab_up %p bar - tab_down %strong baz
Produces:
<h1>foo</h1> <p>bar</p> <strong>baz</strong>
@param i [Fixnum] The number of tabs by which to increase the indentation @see tab_down
# File lib/haml/helpers.rb, line 208 208: def tab_up(i = 1) 209: haml_buffer.tabulation += i 210: end