Class: MirrorMirror::MirrorVisitor

Inherits:
Sass::Tree::Visitors::Base
  • Object
show all
Defined in:
lib/mirror-mirror/mirror_visitor.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MirrorVisitor

Returns a new instance of MirrorVisitor.



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# File 'lib/mirror-mirror/mirror_visitor.rb', line 5

def initialize
  @in_meta_directive = false
  @nested = false
  @enabled = false
  @inline = false
  @options = {}
  @property_transformers = Transformation::PropertyTransformation.instances
  @debug = false
end

Instance Method Details

#visit(node) ⇒ Object 



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# File 'lib/mirror-mirror/mirror_visitor.rb', line 24

def visit(node)
  method = "visit_#{node_name node}"
  if self.respond_to?(method, true)
    self.send(method, node) {node.children = visit_children(node)}
  else
    node.children = visit_children(node)
    node
  end
end

#visit_children(parent) ⇒ Object 



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# File 'lib/mirror-mirror/mirror_visitor.rb', line 34

def visit_children(parent)
  r = super
  r.flatten!
  r.compact!
  r
end

#visit_directive(directive_node) ⇒ Object 



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# File 'lib/mirror-mirror/mirror_visitor.rb', line 112

def visit_directive(directive_node)
  if directive_node.resolved_value.strip == "@-mirror-mirror"
    @in_meta_directive = true
    begin
      yield
    ensure
      @in_meta_directive = false
    end
    nil # remove this node from the output
  elsif directive_node.resolved_value.strip == "@-mirror-mirror no-flip"
    old_enabled = @enabled
    @enabled = false
    begin
      yield
      directive_node.children
    ensure
      @enabled = old_enabled
    end
  elsif directive_node.resolved_value.strip == "@-mirror-mirror inline-flip"
    old_inline = @inline
    old_enabled = @enabled
    @inline = true
    @enabled = true
    begin
      yield
      directive_node.children
    ensure
      @enabled = old_enabled
      @inline = old_inline
    end
  else
    yield
    directive_node
  end
end

#visit_prop(prop_node) ⇒ Object 



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# File 'lib/mirror-mirror/mirror_visitor.rb', line 49

def visit_prop(prop_node)
  if @in_meta_directive && prop_node.resolved_name == "enabled"
    @enabled = prop_node.resolved_value == "true"
    #if @nested
      #raise Sass::SyntaxError, "Cannot #{@enabled ? 'enable' : 'disable'} mirror flipping in a nested context"
    #end
    puts @enabled ? "ENABLED" : "DISABLED" if @debug
    return prop_node
  end

  puts "PROPERTY: #{prop_node.resolved_name}" if @debug
  unless @enabled
    return prop_node
  end

  prop_name = prop_node.resolved_name.downcase
  value = prop_node.resolved_value
  prefix, prop_name = $1, $2 if prop_name =~ /^(\*|_|#|-moz-|-ms-|-webkit-|-o-)(.*)$/
  original_name = prop_name
  original_value = value
  important = nil

  if value =~ /^(.*[^ ])( *!important *)$/
    value, important = $1, $2
  end

  property_transformers(prop_name, :name).each do |t|
    prop_name = t.transform_name(prop_name)
  end

  property_transformers(original_name, :value).each do |t|
    value = t.transform_value(original_name, value)
  end

  expression = nil
  begin
    property_transformers(original_name, :expression).each do |t|
      expression ||= parsed_value(value, prop_node.line, original_name.size)
      expression = t.transform_expression(original_name, expression)
    end
  rescue Sass::SyntaxError => e
    Sass.logger.warn("Syntax error during mirror flip of `#{original_name}: #{original_value}`: #{e.message}")
    return prop_node
  end
  begin
    value = literalize(expression).to_s(@options) if expression
  rescue => e
    Sass.logger.warn "Failed to stringify the transformation of `#{original_name}: #{original_value}`: #{e.message} (#{expression.class.name})"
    Sass.logger.warn(e.backtrace.join("\n"))
    value = original_value
  end

  if @debug && prop_node.resolved_name != "#{prefix}#{prop_name}"
    puts "CHANGED name FROM #{prop_node.resolved_name} TO #{prefix}#{prop_name}"
  end
  if @debug && prop_node.resolved_value != value
    puts "CHANGED value FROM #{prop_node.resolved_value} TO #{value}"
  end
  prop_node.resolved_name = "#{prefix}#{prop_name}"
  prop_node.resolved_value = "#{value}#{important}"
  prop_node
end

#visit_root(root_node) ⇒ Object 



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# File 'lib/mirror-mirror/mirror_visitor.rb', line 15

def visit_root(root_node)
  # XXX set up defaults from options
  @options = root_node.options
  custom_opts = @options[:custom] || {}
  @enabled = !!custom_opts.fetch(:mirror_mirror, MirrorMirror.flipped_by_default)
  root_node.children = yield
  root_node
end

#visit_rule(rule_node) ⇒ Object 



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# File 'lib/mirror-mirror/mirror_visitor.rb', line 41

def visit_rule(rule_node)
  puts "RULE: #{rule_node.resolved_rules}" if @debug
  @nested = true;
  yield
  @nested = false;
  rule_node
end