Class: Haml::Buffer

Inherits:
Object show all
Includes:
Helpers, Util
Defined in:
lib/haml/buffer.rb

Overview

This class is used only internally. It holds the buffer of XHTML that is eventually output by Haml::Engine’s to_html method. It’s called from within the precompiled code, and helps reduce the amount of processing done within instance_eval’d code.

Constant Summary

Constants included from Util

Util::RUBY_VERSION

Constants included from Helpers

Helpers::HTML_ESCAPE

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Util

#def_static_method, #enum_with_index, #has?, #map_hash, #map_keys, #map_vals, #merge_adjacent_strings, #powerset, #ruby1_8?, #scope, #static_method_name, #to_hash

Methods included from Helpers

action_view?, #block_is_haml?, #capture_haml, #escape_once, #find_and_preserve, #haml_concat, #haml_indent, #haml_tag, #html_attrs, #html_escape, #init_haml_helpers, #is_haml?, #list_of, #non_haml, #precede, #preserve, #puts, #succeed, #surround, #tab_down, #tab_up

Methods included from Helpers::ActionViewExtensions

#page_class

Constructor Details

#initialize(upper = nil, options = {}) ⇒ Buffer

Creates a new buffer.



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# File 'lib/haml/buffer.rb', line 70

def initialize(upper = nil, options = {})
  @active = true
  @upper = upper
  @options = {
    :attr_wrapper => "'",
    :ugly => false,
    :format => :xhtml
  }.merge options
  @buffer = ""
  @tabulation = 0

  # The number of tabs that Engine thinks we should have
  # @real_tabs + @tabulation is the number of tabs actually output
  @real_tabs = 0
end

Instance Attribute Details

#active=(value) ⇒ Object (writeonly)

See #active?



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# File 'lib/haml/buffer.rb', line 23

def active=(value)
  @active = value
end

#buffer ⇒ Object

The string that holds the compiled XHTML. This is aliased as _erbout for compatibility with ERB-specific code.



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# File 'lib/haml/buffer.rb', line 12

def buffer
  @buffer
end

#options ⇒ Object

The options hash passed in from Haml::Engine.



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# File 'lib/haml/buffer.rb', line 15

def options
  @options
end

#upper ⇒ Object

The Buffer for the enclosing Haml document. This is set for partials and similar sorts of nested templates. It’s nil at the top level (see #toplevel?).



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# File 'lib/haml/buffer.rb', line 20

def upper
  @upper
end

Class Method Details

.merge_attrs(to, from) ⇒ Object 



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# File 'lib/haml/buffer.rb', line 196

def self.merge_attrs(to, from)
  if to['id'] && from['id']
    to['id'] << '_' << from.delete('id')
  elsif to['id'] || from['id']
    from['id'] ||= to['id']
  end

  if to['class'] && from['class']
    # Make sure we don't duplicate class names
    from['class'] = (from['class'].split(' ') | to['class'].split(' ')).join(' ')
  elsif to['class'] || from['class']
    from['class'] ||= to['class']
  end

  to.merge!(from)
end

Instance Method Details

#active? ⇒ Boolean

True if this buffer is currently being used to render a Haml template. However, this returns false if a subtemplate is being rendered, even if it’s a subtemplate of this buffer’s template.

Returns:

  • (Boolean) 


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# File 'lib/haml/buffer.rb', line 54

def active?
  @active
end

#adjust_tabs(tab_change) ⇒ Object 



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# File 'lib/haml/buffer.rb', line 99

def adjust_tabs(tab_change)
  @real_tabs += tab_change
end

#html4? ⇒ Boolean

True if the format is HTML4

Returns:

  • (Boolean) 


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# File 'lib/haml/buffer.rb', line 36

def html4?
  @options[:format] == :html4
end

#html5? ⇒ Boolean

True if the format is HTML5

Returns:

  • (Boolean) 


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# File 'lib/haml/buffer.rb', line 41

def html5?
  @options[:format] == :html5
end

#html? ⇒ Boolean

True if the format is any flavor of HTML

Returns:

  • (Boolean) 


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# File 'lib/haml/buffer.rb', line 31

def html?
  html4? or html5?
end

#open_tag(name, self_closing, try_one_line, preserve_tag, escape_html, class_id, nuke_outer_whitespace, nuke_inner_whitespace, obj_ref, content, *attributes_hashes) ⇒ Object

Takes the various information about the opening tag for an element, formats it, and adds it to the buffer.



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# File 'lib/haml/buffer.rb', line 165

def open_tag(name, self_closing, try_one_line, preserve_tag, escape_html, class_id,
             nuke_outer_whitespace, nuke_inner_whitespace, obj_ref, content, *attributes_hashes)
  tabulation = @real_tabs

  attributes = class_id
  attributes_hashes.each do |old|
    self.class.merge_attrs(attributes, to_hash(old.map {|k, v| [k.to_s, v]}))
  end
  self.class.merge_attrs(attributes, parse_object_ref(obj_ref)) if obj_ref

  if self_closing && xhtml?
    str = " />" + (nuke_outer_whitespace ? "" : "\n")
  else
    str = ">" + ((if self_closing && html?
                    nuke_outer_whitespace
                  else
                    try_one_line || preserve_tag || nuke_inner_whitespace
                  end) ? "" : "\n")
  end

  attributes = Precompiler.build_attributes(html?, @options[:attr_wrapper], attributes)
  @buffer << "#{nuke_outer_whitespace || @options[:ugly] ? '' : tabs(tabulation)}<#{name}#{attributes}#{str}"

  if content
    @buffer << "#{content}</#{name}>" << (nuke_outer_whitespace ? "" : "\n")
    return
  end

  @real_tabs += 1 unless self_closing || nuke_inner_whitespace
end

#push_text(text, tab_change, dont_tab_up) ⇒ Object 



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# File 'lib/haml/buffer.rb', line 86

def push_text(text, tab_change, dont_tab_up)
  if @tabulation > 0
    # Have to push every line in by the extra user set tabulation.
    # Don't push lines with just whitespace, though,
    # because that screws up precompiled indentation.
    text.gsub!(/^(?!\s+$)/m, tabs)
    text.sub!(tabs, '') if dont_tab_up
  end

  @buffer << text
  @real_tabs += tab_change
end

#tabulation ⇒ Object

Gets the current tabulation of the document.



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# File 'lib/haml/buffer.rb', line 59

def tabulation
  @real_tabs + @tabulation
end

#tabulation=(val) ⇒ Object

Sets the current tabulation of the document.



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# File 'lib/haml/buffer.rb', line 64

def tabulation=(val)
  val = val - @real_tabs
  @tabulation = val > -1 ? val : 0
end

#toplevel? ⇒ Boolean

True if this buffer is a top-level template, as opposed to a nested partial.

Returns:

  • (Boolean) 


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# File 'lib/haml/buffer.rb', line 47

def toplevel?
  upper.nil?
end

#xhtml? ⇒ Boolean

True if the format is XHTML

Returns:

  • (Boolean) 


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# File 'lib/haml/buffer.rb', line 26

def xhtml?
  not html?
end