# class Sass::Tree::Visitors::Convert

A visitor for converting a Sass tree into a source string.

### Public Class Methods

new(options, format) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 15
    def initialize(options, format)
      @options = options
      @format = format
      @tabs = 0
      # 2 spaces by default
      @tab_chars = @options[:indent] || "  "
      @is_else = false
    end

visit(root, options, format) click to toggle source

Runs the visitor on a tree.

@param root [Tree::Node] The root node of the Sass tree. @param options [{Symbol => Object}] An options hash (see {Sass::CSS#initialize}). @param format [Symbol] `:sass` or `:scss`. @return [String] The Sass or SCSS source for the tree.

    # File lib/sass/tree/visitors/convert.rb, line 9
    def self.visit(root, options, format)
      new(options, format).send(:visit, root)
    end

### Protected Instance Methods

visit_atroot(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 263
    def visit_atroot(node)
      if node.query
        "#{tab_str}@at-root #{query_interp_to_src(node.query)}#{yield}"
      elsif node.children.length == 1 && node.children.first.is_a?(Sass::Tree::RuleNode)
        rule = node.children.first
        "#{tab_str}@at-root #{selector_to_src(rule.rule).lstrip}#{visit_children(rule)}"
      else
        "#{tab_str}@at-root#{yield}"
      end
    end

visit_charset(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 44
    def visit_charset(node)
      "#{tab_str}@charset \"#{node.name}\"#{semi}\n"
    end

visit_children(parent) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 24
    def visit_children(parent)
      @tabs += 1
      return @format == :sass ? "\n" : " {}\n" if parent.children.empty?

      res = visit_rule_level(parent.children)

      if @format == :sass
        "\n" + res.rstrip + "\n"
      else
        " {\n" + res.rstrip + "\n#{@tab_chars * (@tabs - 1)}}\n"
      end
    ensure
      @tabs -= 1
    end

visit_comment(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 48
    def visit_comment(node)
      value = interp_to_src(node.value)
      if @format == :sass
        content = value.gsub(%r{\*/$}, '').rstrip
        if content =~ /\A[ \t]/
          # Re-indent SCSS comments like this:
          #     /* foo
          #   bar
          #       baz */
          content.gsub!(/^/, '   ')
          content.sub!(%r{\A([ \t]*)/\*}, '/*\1')
        end

        if content.include?("\n")
          content.gsub!(/\n \*/, "\n  ")
          spaces = content.scan(/\n( *)/).map {|s| s.first.size}.min
          sep = node.type == :silent ? "\n//" : "\n *"
          if spaces >= 2
            content.gsub!(/\n  /, sep)
          else
            content.gsub!(/\n#{' ' * spaces}/, sep)
          end
        end

        content.gsub!(%r{\A/\*}, '//') if node.type == :silent
        content.gsub!(/^/, tab_str)
        content = content.rstrip + "\n"
      else
        spaces = (@tab_chars * [@tabs - value[/^ */].size, 0].max)
        content = if node.type == :silent
                    value.gsub(%r{^[/ ]\*}, '//').gsub(%r{ *\*/$}, '')
                  else
                    value
                  end.gsub(/^/, spaces) + "\n"
      end
      content
    end

visit_content(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 219
    def visit_content(node)
      "#{tab_str}@content#{semi}\n"
    end

visit_cssimport(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 161
    def visit_cssimport(node)
      if node.uri.is_a?(Sass::Script::Tree::Node)
        str = "#{tab_str}@import #{node.uri.to_sass(@options)}"
      else
        str = "#{tab_str}@import #{node.uri}"
      end
      str << " supports(#{node.supports_condition.to_src(@options)})" if node.supports_condition
      str << " #{interp_to_src(node.query)}" unless node.query.empty?
      "#{str}#{semi}\n"
    end

visit_debug(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 86
    def visit_debug(node)
      "#{tab_str}@debug #{node.expr.to_sass(@options)}#{semi}\n"
    end

visit_directive(node) { || ... } click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 94
    def visit_directive(node)
      res = "#{tab_str}#{interp_to_src(node.value)}"
      res.gsub!(/^@import \#\{(.*)\}([^}]*)$/, '@import \1\2')
      return res + "#{semi}\n" unless node.has_children
      res + yield
    end

visit_each(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 101
    def visit_each(node)
      vars = node.vars.map {|var| "$#{dasherize(var)}"}.join(", ")
      "#{tab_str}@each #{vars} in #{node.list.to_sass(@options)}#{yield}"
    end

visit_error(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 90
    def visit_error(node)
      "#{tab_str}@error #{node.expr.to_sass(@options)}#{semi}\n"
    end

visit_extend(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 106
    def visit_extend(node)
      "#{tab_str}@extend #{selector_to_src(node.selector).lstrip}" +
        "#{' !optional' if node.optional?}#{semi}\n"
    end

visit_for(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 111
    def visit_for(node)
      "#{tab_str}@for $#{dasherize(node.var)} from #{node.from.to_sass(@options)} " +
        "#{node.exclusive ? 'to' : 'through'} #{node.to.to_sass(@options)}#{yield}"
    end

visit_function(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 116
    def visit_function(node)
      args = node.args.map do |v, d|
        d ? "#{v.to_sass(@options)}: #{d.to_sass(@options)}" : v.to_sass(@options)
      end.join(", ")
      if node.splat
        args << ", " unless node.args.empty?
        args << node.splat.to_sass(@options) << "..."
      end

      "#{tab_str}@function #{dasherize(node.name)}(#{args})#{yield}"
    end

visit_if(node) { || ... } click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 128
    def visit_if(node)
      name =
        if !@is_else
          "if"
        elsif node.expr
          "else if"
        else
          "else"
        end
      @is_else = false
      str = "#{tab_str}@#{name}"
      str << " #{node.expr.to_sass(@options)}" if node.expr
      str << yield
      @is_else = true
      str << visit(node.else) if node.else
      str
    ensure
      @is_else = false
    end

visit_import(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 148
    def visit_import(node)
      quote = @format == :scss ? '"' : ''
      "#{tab_str}@import #{quote}#{node.imported_filename}#{quote}#{semi}\n"
    end

visit_keyframerule(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 274
    def visit_keyframerule(node)
      "#{tab_str}#{node.resolved_value}#{yield}"
    end

visit_media(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 153
    def visit_media(node)
      "#{tab_str}@media #{query_interp_to_src(node.query)}#{yield}"
    end

visit_mixin(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 197
    def visit_mixin(node)
      arg_to_sass = lambda do |arg|
        sass = arg.to_sass(@options)
        sass = "(#{sass})" if arg.is_a?(Sass::Script::Tree::ListLiteral) && arg.separator == :comma
        sass
      end

      unless node.args.empty? && node.keywords.empty? && node.splat.nil?
        args = node.args.map(&arg_to_sass)
        keywords = node.keywords.as_stored.to_a.map {|k, v| "$#{dasherize(k)}: #{arg_to_sass[v]}"}

        if node.splat
          splat = "#{arg_to_sass[node.splat]}..."
          kwarg_splat = "#{arg_to_sass[node.kwarg_splat]}..." if node.kwarg_splat
        end

        arglist = "(#{[args, splat, keywords, kwarg_splat].flatten.compact.join(', ')})"
      end
      "#{tab_str}#{@format == :sass ? '+' : '@include '}" +
        "#{dasherize(node.name)}#{arglist}#{node.has_children ? yield : semi}\n"
    end

visit_mixindef(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 172
    def visit_mixindef(node)
      args =
        if node.args.empty? && node.splat.nil?
          ""
        else
          str = '('
          str << node.args.map do |v, d|
            if d
              "#{v.to_sass(@options)}: #{d.to_sass(@options)}"
            else
              v.to_sass(@options)
            end
          end.join(", ")

          if node.splat
            str << ", " unless node.args.empty?
            str << node.splat.to_sass(@options) << '...'
          end

          str << ')'
        end

      "#{tab_str}#{@format == :sass ? '=' : '@mixin '}#{dasherize(node.name)}#{args}#{yield}"
    end

visit_prop(node) { || ... } click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 223
    def visit_prop(node)
      res = tab_str + node.declaration(@options, @format)
      return res + semi + "\n" if node.children.empty?
      res + yield.rstrip + semi + "\n"
    end

visit_return(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 229
    def visit_return(node)
      "#{tab_str}@return #{node.expr.to_sass(@options)}#{semi}\n"
    end

visit_root(node) click to toggle source

Ensures proper spacing between top-level nodes.

    # File lib/sass/tree/visitors/convert.rb, line 40
    def visit_root(node)
      visit_rule_level(node.children)
    end

visit_rule(node) { || ... } click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 233
    def visit_rule(node)
      rule = node.parsed_rules ? [node.parsed_rules.to_s] : node.rule
      if @format == :sass
        name = selector_to_sass(rule)
        name = "\\" + name if name[0] == ?:
        name.gsub(/^/, tab_str) + yield
      elsif @format == :scss
        name = selector_to_scss(rule)
        res = name + yield
        if node.children.last.is_a?(Sass::Tree::CommentNode) && node.children.last.type == :silent
          res.slice!(-3..-1)
          res << "\n" << tab_str << "}\n"
        end
        res
      end
    end

visit_supports(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 157
    def visit_supports(node)
      "#{tab_str}@#{node.name} #{node.condition.to_src(@options)}#{yield}"
    end

visit_variable(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 250
    def visit_variable(node)
      "#{tab_str}$#{dasherize(node.name)}: #{node.expr.to_sass(@options)}" +
        "#{' !global' if node.global}#{' !default' if node.guarded}#{semi}\n"
    end

visit_warn(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 255
    def visit_warn(node)
      "#{tab_str}@warn #{node.expr.to_sass(@options)}#{semi}\n"
    end

visit_while(node) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 259
    def visit_while(node)
      "#{tab_str}@while #{node.expr.to_sass(@options)}#{yield}"
    end

### Private Instance Methods

dasherize(s) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 343
    def dasherize(s)
      if @options[:dasherize]
        s.tr('_', '-')
      else
        s
      end
    end

interp_to_src(interp) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 301
    def interp_to_src(interp)
      interp.map {|r| r.is_a?(String) ? r : r.to_sass(@options)}.join
    end

query_interp_to_src(interp) click to toggle source

Like #interp_to_src, but removes the unnecessary `#{}` around the keys and values in query expressions.

    # File lib/sass/tree/visitors/convert.rb, line 307
    def query_interp_to_src(interp)
      interp = interp.map do |e|
        next e unless e.is_a?(Sass::Script::Tree::Literal)
        next e unless e.value.is_a?(Sass::Script::Value::String)
        e.value.value
      end

      interp_to_src(interp)
    end

selector_to_sass(sel) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 321
    def selector_to_sass(sel)
      sel.map do |r|
        if r.is_a?(String)
          r.gsub(/(,)?([ \t]*)\n\s*/) {$1 ? "#{$1}#{$2}\n" : " "}
        else
          r.to_sass(@options)
        end
      end.join
    end

selector_to_scss(sel) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 331
    def selector_to_scss(sel)
      interp_to_src(sel).gsub(/^[ \t]*/, tab_str).gsub(/[ \t]*$/, '')
    end

selector_to_src(sel) click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 317
    def selector_to_src(sel)
      @format == :sass ? selector_to_sass(sel) : selector_to_scss(sel)
    end

semi() click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 335
    def semi
      @format == :sass ? "" : ";"
    end

tab_str() click to toggle source

    # File lib/sass/tree/visitors/convert.rb, line 339
    def tab_str
      @tab_chars * @tabs
    end

visit_rule_level(nodes) click to toggle source

Visit rule-level nodes and return their conversion with appropriate whitespace added.

    # File lib/sass/tree/visitors/convert.rb, line 282
    def visit_rule_level(nodes)
      (nodes + [nil]).each_cons(2).map do |child, nxt|
        visit(child) +
          if nxt &&
              (child.is_a?(Sass::Tree::CommentNode) && child.line + child.lines + 1 == nxt.line) ||
              (child.is_a?(Sass::Tree::ImportNode) && nxt.is_a?(Sass::Tree::ImportNode) &&
                child.line + 1 == nxt.line) ||
              (child.is_a?(Sass::Tree::VariableNode) && nxt.is_a?(Sass::Tree::VariableNode) &&
                child.line + 1 == nxt.line) ||
              (child.is_a?(Sass::Tree::PropNode) && nxt.is_a?(Sass::Tree::PropNode)) ||
              (child.is_a?(Sass::Tree::MixinNode) && nxt.is_a?(Sass::Tree::MixinNode) &&
                child.line + 1 == nxt.line)
            ""
          else
            "\n"
          end
      end.join.rstrip + "\n"
    end