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# A visitor for converting a Sass tree into a source string.
class Sass::Tree::Visitors::Convert < Sass::Tree::Visitors::Base
# 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.
def self.visit(root, options, format)
new(options, format).send(:visit, root)
end
protected
def initialize(options, format)
@options = options
@format = format
@tabs = 0
# 2 spaces by default
@tab_chars = @options[:indent] || " "
@is_else = false
end
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
# Ensures proper spacing between top-level nodes.
def visit_root(node)
visit_rule_level(node.children)
end
def visit_charset(node)
"#{tab_str}@charset \"#{node.name}\"#{semi}\n"
end
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
def visit_debug(node)
"#{tab_str}@debug #{node.expr.to_sass(@options)}#{semi}\n"
end
def visit_error(node)
"#{tab_str}@error #{node.expr.to_sass(@options)}#{semi}\n"
end
def visit_directive(node)
res = "#{tab_str}#{interp_to_src(node.value)}"
res.gsub!(/^@import \#\{(.*)\}([^}]*)$/, '@import \1\2')
return res + "#{semi}\n" unless node.has_children
res + yield
end
def visit_each(node)
vars = node.vars.map {|var| "$#{dasherize(var)}"}.join(", ")
"#{tab_str}@each #{vars} in #{node.list.to_sass(@options)}#{yield}"
end
def visit_extend(node)
"#{tab_str}@extend #{selector_to_src(node.selector).lstrip}" +
"#{' !optional' if node.optional?}#{semi}\n"
end
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
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
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
def visit_import(node)
quote = @format == :scss ? '"' : ''
"#{tab_str}@import #{quote}#{node.imported_filename}#{quote}#{semi}\n"
end
def visit_media(node)
"#{tab_str}@media #{query_interp_to_src(node.query)}#{yield}"
end
def visit_supports(node)
"#{tab_str}@#{node.name} #{node.condition.to_src(@options)}#{yield}"
end
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
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
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
def visit_content(node)
"#{tab_str}@content#{semi}\n"
end
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
def visit_return(node)
"#{tab_str}@return #{node.expr.to_sass(@options)}#{semi}\n"
end
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
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
def visit_warn(node)
"#{tab_str}@warn #{node.expr.to_sass(@options)}#{semi}\n"
end
def visit_while(node)
"#{tab_str}@while #{node.expr.to_sass(@options)}#{yield}"
end
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
def visit_keyframerule(node)
"#{tab_str}#{node.resolved_value}#{yield}"
end
private
# Visit rule-level nodes and return their conversion with appropriate
# whitespace added.
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
def interp_to_src(interp)
interp.map {|r| r.is_a?(String) ? r : r.to_sass(@options)}.join
end
# Like interp_to_src, but removes the unnecessary `#{}` around the keys and
# values in query expressions.
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
def selector_to_src(sel)
@format == :sass ? selector_to_sass(sel) : selector_to_scss(sel)
end
def selector_to_sass(sel)
sel.map do |r|
if r.is_a?(String)
r.gsub(/(,)?([ \t]*)\n\s*/) {$1 ? "#{$1}#{$2}\n" : " "}
else
r.to_sass(@options)
end
end.join
end
def selector_to_scss(sel)
interp_to_src(sel).gsub(/^[ \t]*/, tab_str).gsub(/[ \t]*$/, '')
end
def semi
@format == :sass ? "" : ";"
end
def tab_str
@tab_chars * @tabs
end
def dasherize(s)
if @options[:dasherize]
s.tr('_', '-')
else
s
end
end
end
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