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.
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 53 53: def self.action_view? 54: @@action_view_defined 55: 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 538 538: def block_is_haml?(block) 539: eval('_hamlout', block.binding) 540: true 541: rescue 542: false 543: 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 `”
13
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 337 337: def capture_haml(*args, &block) 338: buffer = eval('_hamlout', block.binding) rescue haml_buffer 339: with_haml_buffer(buffer) do 340: position = haml_buffer.buffer.length 341: 342: haml_buffer.capture_position = position 343: block.call(*args) 344: 345: captured = haml_buffer.buffer.slice!(position..1) 346: return captured if haml_buffer.options[:ugly] 347: captured = captured.split(/^/) 348: 349: min_tabs = nil 350: captured.each do |line| 351: tabs = line.index(/[^ ]/) || line.length 352: min_tabs ||= tabs 353: min_tabs = min_tabs > tabs ? tabs : min_tabs 354: end 355: 356: captured.map do |line| 357: line[min_tabs..1] 358: end.join 359: end 360: ensure 361: haml_buffer.capture_position = nil 362: 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 517 517: def escape_once(text) 518: Haml::Util.silence_warnings do 519: text.to_s.gsub(/[\"><]|&(?!(?:[a-zA-Z]+|(#\d+));)/) {|s| HTML_ESCAPE[s]} 520: end 521: end
Uses {#preserve} to convert any newlines inside whitespace-sensitive tags into the HTML entities for endlines.
@param tags [Array
@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 108 108: def find_and_preserve(input = nil, tags = haml_buffer.options[:preserve], &block) 109: return find_and_preserve(capture_haml(&block), input || tags) if block 110: input.to_s.gsub(/<(#{tags.map(&Regexp.method(:escape)).join('|')})([^>]*)>(.*?)(<\/\11>>)/m) do 111: "<#{$1}#{$2}>#{preserve($3)}</#{$1}>" 112: end 113: end
Outputs text directly to the Haml buffer, with the proper indentation.
@param text [#] The text to output
# File lib/haml/helpers.rb, line 367 367: def haml_concat(text = "") 368: unless haml_buffer.options[:ugly] || haml_indent == 0 369: haml_buffer.buffer << haml_indent << 370: text.to_s.gsub("\n", "\n" + haml_indent) << "\n" 371: else 372: haml_buffer.buffer << text.to_s << "\n" 373: end 374: ErrorReturn.new("haml_concat") 375: end
@return [String] The indentation string for the current line
# File lib/haml/helpers.rb, line 378 378: def haml_indent 379: ' ' * haml_buffer.tabulation 380: 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.
`name` can be a string using the standard Haml class/id shorthand (e.g. “span#.bar”, “#“). Just like standard Haml tags, these class and id values will be merged with manually-specified attributes.
`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.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 [#] The name of the tag @param flags [Array
@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 439 439: def haml_tag(name, *rest, &block) 440: ret = ErrorReturn.new("haml_tag") 441: 442: text = rest.shift.to_s unless [Symbol, Hash, NilClass].any? {|t| rest.first.is_a? t} 443: flags = [] 444: flags << rest.shift while rest.first.is_a? Symbol 445: name, attrs = merge_name_and_attributes(name.to_s, rest.shift || {}) 446: 447: attributes = Haml::Precompiler.build_attributes(haml_buffer.html?, 448: haml_buffer.options[:attr_wrapper], 449: attrs) 450: 451: if text.nil? && block.nil? && (haml_buffer.options[:autoclose].include?(name) || flags.include?(:/)) 452: haml_concat "<#{name}#{attributes} />" 453: return ret 454: end 455: 456: if flags.include?(:/) 457: raise Error.new("Self-closing tags can't have content.") if text 458: raise Error.new("Illegal nesting: nesting within a self-closing tag is illegal.") if block 459: end 460: 461: tag = "<#{name}#{attributes}>" 462: if block.nil? 463: text = text.to_s 464: if text.include?("\n") 465: haml_concat tag 466: tab_up 467: haml_concat text 468: tab_down 469: haml_concat "</#{name}>" 470: else 471: tag << text << "</#{name}>" 472: haml_concat tag 473: end 474: return ret 475: end 476: 477: if text 478: raise Error.new("Illegal nesting: content can't be both given to haml_tag :#{name} and nested within it.") 479: end 480: 481: if flags.include?(:<) 482: tag << capture_haml(&block).strip << "</#{name}>" 483: haml_concat tag 484: return ret 485: end 486: 487: haml_concat tag 488: tab_up 489: block.call 490: tab_down 491: haml_concat "</#{name}>" 492: 493: ret 494: 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 [{# => String}] The attribute hash
# File lib/haml/helpers.rb, line 196 196: def html_attrs(lang = 'en-US') 197: {:xmlns => "http://www.w3.org/1999/xhtml", 'xml:lang' => lang, :lang => lang} 198: end
Returns a copy of `text` with ampersands, angle brackets and quotes escaped into HTML entities.
Note that if ActionView is loaded and XSS protection is enabled (as is the default for Rails 3.0+, and optional for version 2.3.5+), this won’t escape text declared as “safe”.
@param text [String] The string to sanitize @return [String] The sanitized string
# File lib/haml/helpers.rb, line 508 508: def html_escape(text) 509: Haml::Util.silence_warnings {text.to_s.gsub(/[\"><&]/) {|s| HTML_ESCAPE[s]}} 510: 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 73 73: def init_haml_helpers 74: @haml_buffer = Haml::Buffer.new(@haml_buffer, Haml::Engine.new('').send(:options_for_buffer)) 75: nil 76: 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 530 530: def is_haml? 531: !@haml_buffer.nil? && @haml_buffer.active? 532: 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 `
= 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 168 168: def list_of(enum, &block) 169: to_return = enum.collect do |i| 170: result = capture_haml(i, &block) 171: 172: if result.count("\n") > 1 173: result.gsub!("\n", "\n ") 174: result = "\n #{result.strip}\n" 175: else 176: result.strip! 177: end 178: 179: "<li>#{result}</li>" 180: end 181: to_return.join("\n") 182: 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 87 87: def non_haml 88: was_active = @haml_buffer.active? 89: @haml_buffer.active = false 90: yield 91: ensure 92: @haml_buffer.active = was_active 93: 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 300 300: def precede(str, &block) 301: "#{str}#{capture_haml(&block).chomp}\n" 302: 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 127 127: def preserve(input = nil, &block) 128: return preserve(capture_haml(&block)) if block 129: input.to_s.chomp("\n").gsub(/\n/, '
').gsub(/\r/, '') 130: 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 319 319: def succeed(str, &block) 320: "#{capture_haml(&block).chomp}#{str}\n" 321: 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 281 281: def surround(front, back = front, &block) 282: output = capture_haml(&block) 283: 284: "#{front}#{output.chomp}#{back}\n" 285: end
Decrements the number of tabs the buffer automatically adds to the lines of the template.
@param i [Fixnum] The number of tabs by which to decrease the indentation @see #
# File lib/haml/helpers.rb, line 227 227: def tab_down(i = 1) 228: haml_buffer.tabulation -= i 229: 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 #
# File lib/haml/helpers.rb, line 218 218: def tab_up(i = 1) 219: haml_buffer.tabulation += i 220: end
Sets the number of tabs the buffer automatically adds to the lines of the template, but only for the duration of the block. For example:
%h1 foo * with_tabs(2) do %p bar %strong baz
Produces:
<h1>foo</h1> <p>bar</p> <strong>baz</strong>
@param i [Fixnum] The number of tabs to use @yield A block in which the indentation will be `i` spaces
# File lib/haml/helpers.rb, line 250 250: def with_tabs(i) 251: old_tabs = haml_buffer.tabulation 252: haml_buffer.tabulation = i 253: yield 254: ensure 255: haml_buffer.tabulation = old_tabs 256: end
Gives a proc the same local `_hamlout` and `_erbout` variables that the current template has.
@param proc [#] The proc to bind @return [Proc] A new proc with the new variables bound
# File lib/haml/helpers.rb, line 585 585: def haml_bind_proc(&proc) 586: _hamlout = haml_buffer 587: _erbout = _hamlout.buffer 588: proc { |*args| proc.call(*args) } 589: end
The current {Haml::Buffer} object.
@return [Haml::Buffer]
# File lib/haml/helpers.rb, line 576 576: def haml_buffer 577: @haml_buffer 578: end
Parses the tag name used for {#haml_tag} and merges it with the Ruby attributes hash.
# File lib/haml/helpers.rb, line 549 549: def merge_name_and_attributes(name, attributes_hash = {}) 550: # skip merging if no ids or classes found in name 551: return name, attributes_hash unless name =~ /^(.+?)?([\.#].*)$/ 552: 553: return $1 || "div", Buffer.merge_attrs( 554: Precompiler.parse_class_and_id($2), 555: Haml::Util.map_keys(attributes_hash) {|key| key.to_s}) 556: end
Runs a block of code with the given buffer as the currently active buffer.
@param buffer [Haml::Buffer] The Haml buffer to use temporarily @yield A block in which the given buffer should be used
# File lib/haml/helpers.rb, line 562 562: def with_haml_buffer(buffer) 563: @haml_buffer, old_buffer = buffer, @haml_buffer 564: old_buffer.active, old_was_active = false, old_buffer.active? if old_buffer 565: @haml_buffer.active, was_active = true, @haml_buffer.active? 566: yield 567: ensure 568: @haml_buffer.active = was_active 569: old_buffer.active = old_was_active if old_buffer 570: @haml_buffer = old_buffer 571: end
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