/usr/lib/ruby/vendor_ruby/sass/tree/visitors/perform.rb is in ruby-sass 3.1.15-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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class Sass::Tree::Visitors::Perform < Sass::Tree::Visitors::Base
# @param root [Tree::Node] The root node of the tree to visit.
# @param environment [Sass::Environment] The lexical environment.
# @return [Tree::Node] The resulting tree of static nodes.
def self.visit(root, environment = Sass::Environment.new)
new(environment).send(:visit, root)
end
protected
def initialize(env)
@environment = env
end
# If an exception is raised, this add proper metadata to the backtrace.
def visit(node)
super(node.dup)
rescue Sass::SyntaxError => e
e.modify_backtrace(:filename => node.filename, :line => node.line)
raise e
end
# Keeps track of the current environment.
def visit_children(parent)
with_environment Sass::Environment.new(@environment) do
parent.children = super.flatten
parent
end
end
# Runs a block of code with the current environment replaced with the given one.
#
# @param env [Sass::Environment] The new environment for the duration of the block.
# @yield A block in which the environment is set to `env`.
# @return [Object] The return value of the block.
def with_environment(env)
old_env, @environment = @environment, env
yield
ensure
@environment = old_env
end
# Sets the options on the environment if this is the top-level root.
def visit_root(node)
@environment.options = node.options if @environment.options.nil? || @environment.options.empty?
yield
rescue Sass::SyntaxError => e
e.sass_template ||= node.template
raise e
end
# Removes this node from the tree if it's a silent comment.
def visit_comment(node)
return [] if node.invisible?
check_for_loud_silent_comment node
check_for_comment_interp node
node.resolved_value = run_interp_no_strip(node.value)
node.resolved_value.gsub!(/\\([\\#])/, '\1')
node
end
# Prints the expression to STDERR.
def visit_debug(node)
res = node.expr.perform(@environment)
res = res.value if res.is_a?(Sass::Script::String)
if node.filename
$stderr.puts "#{node.filename}:#{node.line} DEBUG: #{res}"
else
$stderr.puts "Line #{node.line} DEBUG: #{res}"
end
[]
end
# Runs the child nodes once for each value in the list.
def visit_each(node)
list = node.list.perform(@environment)
with_environment Sass::Environment.new(@environment) do
list.to_a.map do |v|
@environment.set_local_var(node.var, v)
node.children.map {|c| visit(c)}
end.flatten
end
end
# Runs SassScript interpolation in the selector,
# and then parses the result into a {Sass::Selector::CommaSequence}.
def visit_extend(node)
parser = Sass::SCSS::CssParser.new(run_interp(node.selector), node.filename, node.line)
node.resolved_selector = parser.parse_selector
node
end
# Runs the child nodes once for each time through the loop, varying the variable each time.
def visit_for(node)
from = node.from.perform(@environment)
to = node.to.perform(@environment)
from.assert_int!
to.assert_int!
to = to.coerce(from.numerator_units, from.denominator_units)
range = Range.new(from.to_i, to.to_i, node.exclusive)
with_environment Sass::Environment.new(@environment) do
range.map do |i|
@environment.set_local_var(node.var,
Sass::Script::Number.new(i, from.numerator_units, from.denominator_units))
node.children.map {|c| visit(c)}
end.flatten
end
end
# Loads the function into the environment.
def visit_function(node)
@environment.set_function(node.name,
Sass::Callable.new(node.name, node.args, @environment, node.children))
[]
end
# Runs the child nodes if the conditional expression is true;
# otherwise, tries the else nodes.
def visit_if(node)
if node.expr.nil? || node.expr.perform(@environment).to_bool
yield
node.children
elsif node.else
visit(node.else)
else
[]
end
end
# Returns a static DirectiveNode if this is importing a CSS file,
# or parses and includes the imported Sass file.
def visit_import(node)
if path = node.css_import?
return Sass::Tree::DirectiveNode.new("@import url(#{path})")
end
file = node.imported_file
handle_import_loop!(node) if @environment.files_in_use.include?(file.options[:filename])
@environment.push_frame(:filename => node.filename, :line => node.line)
root = file.to_tree
Sass::Tree::Visitors::CheckNesting.visit(root)
node.children = root.children.map {|c| visit(c)}.flatten
node
rescue Sass::SyntaxError => e
e.modify_backtrace(:filename => node.imported_file.options[:filename])
e.add_backtrace(:filename => node.filename, :line => node.line)
raise e
ensure
@environment.pop_frame
end
# Loads a mixin into the environment.
def visit_mixindef(node)
@environment.set_mixin(node.name,
Sass::Callable.new(node.name, node.args, @environment, node.children))
[]
end
# Runs a mixin.
def visit_mixin(node)
handle_include_loop!(node) if @environment.mixins_in_use.include?(node.name)
original_env = @environment
original_env.push_frame(:filename => node.filename, :line => node.line)
original_env.prepare_frame(:mixin => node.name)
raise Sass::SyntaxError.new("Undefined mixin '#{node.name}'.") unless mixin = @environment.mixin(node.name)
passed_args = node.args.dup
passed_keywords = node.keywords.dup
raise Sass::SyntaxError.new(<<END.gsub("\n", "")) if mixin.args.size < passed_args.size
Mixin #{node.name} takes #{mixin.args.size} argument#{'s' if mixin.args.size != 1}
but #{node.args.size} #{node.args.size == 1 ? 'was' : 'were'} passed.
END
passed_keywords.each do |name, value|
# TODO: Make this fast
unless mixin.args.find {|(var, default)| var.underscored_name == name}
raise Sass::SyntaxError.new("Mixin #{node.name} doesn't have an argument named $#{name}")
end
end
environment = mixin.args.zip(passed_args).
inject(Sass::Environment.new(mixin.environment)) do |env, ((var, default), value)|
env.set_local_var(var.name,
if value
value.perform(@environment)
elsif kv = passed_keywords[var.underscored_name]
kv.perform(@environment)
elsif default
default.perform(env)
end)
raise Sass::SyntaxError.new("Mixin #{node.name} is missing parameter #{var.inspect}.") unless env.var(var.name)
env
end
with_environment(environment) {node.children = mixin.tree.map {|c| visit(c)}.flatten}
node
rescue Sass::SyntaxError => e
if original_env # Don't add backtrace info if this is an @include loop
e.modify_backtrace(:mixin => node.name, :line => node.line)
e.add_backtrace(:line => node.line)
end
raise e
ensure
original_env.pop_frame if original_env
end
# Runs any SassScript that may be embedded in a property.
def visit_prop(node)
node.resolved_name = run_interp(node.name)
val = node.value.perform(@environment)
node.resolved_value = val.to_s
yield
end
# Returns the value of the expression.
def visit_return(node)
throw :_sass_return, node.expr.perform(@environment)
end
# Runs SassScript interpolation in the selector,
# and then parses the result into a {Sass::Selector::CommaSequence}.
def visit_rule(node)
rule = node.rule
rule = rule.map {|e| e.is_a?(String) && e != ' ' ? e.strip : e} if node.style == :compressed
parser = Sass::SCSS::StaticParser.new(run_interp(node.rule), node.filename, node.line)
node.parsed_rules ||= parser.parse_selector
if node.options[:trace_selectors]
@environment.push_frame(:filename => node.filename, :line => node.line)
node.stack_trace = @environment.stack_trace
@environment.pop_frame
end
yield
end
# Loads the new variable value into the environment.
def visit_variable(node)
return [] if node.guarded && !@environment.var(node.name).nil?
val = node.expr.perform(@environment)
@environment.set_var(node.name, val)
[]
end
# Prints the expression to STDERR with a stylesheet trace.
def visit_warn(node)
@environment.push_frame(:filename => node.filename, :line => node.line)
res = node.expr.perform(@environment)
res = res.value if res.is_a?(Sass::Script::String)
msg = "WARNING: #{res}\n "
msg << @environment.stack_trace.join("\n ")
# JRuby doesn't automatically add a newline for #warn
msg << (RUBY_PLATFORM =~ /java/ ? "\n\n" : "\n")
Sass::Util.sass_warn msg
[]
ensure
@environment.pop_frame
end
# Runs the child nodes until the continuation expression becomes false.
def visit_while(node)
children = []
with_environment Sass::Environment.new(@environment) do
children += node.children.map {|c| visit(c)} while node.expr.perform(@environment).to_bool
end
children.flatten
end
def visit_directive(node)
if node.value['#{']
if node.value =~ /^@import (?!url\()/
Sass::Util.sass_warn <<WARNING
DEPRECATION WARNING on line #{node.line}#{" of #{node.filename}" if node.filename}:
@import directives using \#{} interpolation will need to use url() in Sass 3.2.
For example:
@import url("http://\#{$url}/style.css");
WARNING
end
node.value = run_interp(Sass::Engine.parse_interp(node.value, node.line, 0, node.options))
end
yield
node
end
private
def run_interp_no_strip(text)
text.map do |r|
next r if r.is_a?(String)
val = r.perform(@environment)
# Interpolated strings should never render with quotes
next val.value if val.is_a?(Sass::Script::String)
val.to_s
end.join
end
def run_interp(text)
run_interp_no_strip(text).strip
end
def handle_include_loop!(node)
msg = "An @include loop has been found:"
mixins = @environment.stack.map {|s| s[:mixin]}.compact
raise Sass::SyntaxError.new("#{msg} #{node.name} includes itself") if mixins.size == 1
mixins << node.name
msg << "\n" << Sass::Util.enum_cons(mixins, 2).map do |m1, m2|
" #{m1} includes #{m2}"
end.join("\n")
raise Sass::SyntaxError.new(msg)
end
def handle_import_loop!(node)
msg = "An @import loop has been found:"
files = @environment.stack.map {|s| s[:filename]}.compact
if node.filename == node.imported_file.options[:filename]
raise Sass::SyntaxError.new("#{msg} #{node.filename} imports itself")
end
files << node.filename << node.imported_file.options[:filename]
msg << "\n" << Sass::Util.enum_cons(files, 2).map do |m1, m2|
" #{m1} imports #{m2}"
end.join("\n")
raise Sass::SyntaxError.new(msg)
end
def check_for_loud_silent_comment(node)
return unless node.loud && node.silent
Sass::Util.sass_warn <<MESSAGE
WARNING:
On line #{node.line}#{" of '#{node.filename}'" if node.filename}
`//` comments will no longer be allowed to use the `!` flag in Sass 3.2.
Please change to `/*` comments.
MESSAGE
end
def check_for_comment_interp(node)
return if node.loud
node.value.each do |e|
next unless e.is_a?(String)
e.scan(/(\\*)#\{/) do |esc|
Sass::Util.sass_warn <<MESSAGE if esc.first.size.even?
WARNING:
On line #{node.line}#{" of '#{node.filename}'" if node.filename}
Comments will evaluate the contents of interpolations (\#{ ... }) in Sass 3.2.
Please escape the interpolation by adding a backslash before the `#`.
MESSAGE
return
end
end
end
end
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