class Sass::Script::Parser

The parser for SassScript. It parses a string of code into a tree of {Script::Tree::Node}s.

Constants

ASSOCIATIVE
EXPR_NAMES

It would be possible to have unified assert and try methods, but detecting the method/token difference turns out to be quite expensive.

PRECEDENCE

Public Class Methods

associative?(op) click to toggle source

Returns whether or not the given operation is associative.

@private

# File lib/sass/script/parser.rb, line 252
def associative?(op)
  ASSOCIATIVE.include?(op)
end
new(str, line, offset, options = {}) click to toggle source

@param str [String, StringScanner] The source text to parse @param line [Fixnum] The line on which the SassScript appears.

Used for error reporting and sourcemap building

@param offset [Fixnum] The character (not byte) offset where the script starts in the line.

Used for error reporting and sourcemap building

@param options [{Symbol => Object}] An options hash;

see {file:SASS_REFERENCE.md#sass_options the Sass options documentation}
# File lib/sass/script/parser.rb, line 29
def initialize(str, line, offset, options = {})
  @options = options
  @lexer = lexer_class.new(str, line, offset, options)
end
parse(*args) click to toggle source

Parses a SassScript expression.

@overload parse(str, line, offset, filename = nil) @return [Script::Tree::Node] The root node of the parse tree @see Parser#initialize @see #parse

# File lib/sass/script/parser.rb, line 222
def self.parse(*args)
  new(*args).parse
end
precedence_of(op) click to toggle source

Returns an integer representing the precedence of the given operator. A lower integer indicates a looser binding.

@private

# File lib/sass/script/parser.rb, line 242
def precedence_of(op)
  PRECEDENCE.each_with_index do |e, i|
    return i if Array(e).include?(op)
  end
  raise "[BUG] Unknown operator #{op.inspect}"
end

Private Class Methods

production(name, sub, *ops) click to toggle source

Defines a simple left-associative production. name is the name of the production, sub is the name of the production beneath it, and ops is a list of operators for this precedence level

# File lib/sass/script/parser.rb, line 262
        def production(name, sub, *ops)
          class_eval "            def #{name}
              interp = try_ops_after_interp(#{ops.inspect}, #{name.inspect})
              return interp if interp
              return unless e = #{sub}
              while tok = try_toks(#{ops.map {|o| o.inspect}.join(', ')})
                if interp = try_op_before_interp(tok, e)
                  other_interp = try_ops_after_interp(#{ops.inspect}, #{name.inspect}, interp)
                  return interp unless other_interp
                  return other_interp
                end

                e = node(Tree::Operation.new(e, assert_expr(#{sub.inspect}), tok.type),
                         e.source_range.start_pos)
              end
              e
            end
", __FILE__, __LINE__ + 1
        end
unary(op, sub) click to toggle source
# File lib/sass/script/parser.rb, line 283
        def unary(op, sub)
          class_eval "            def unary_#{op}
              return #{sub} unless tok = try_tok(:#{op})
              interp = try_op_before_interp(tok)
              return interp if interp
              start_pos = source_position
              node(Tree::UnaryOperation.new(assert_expr(:unary_#{op}), :#{op}), start_pos)
            end
", __FILE__, __LINE__ + 1
        end

Public Instance Methods

line() click to toggle source

The line number of the parser's current position.

@return [Fixnum]

# File lib/sass/script/parser.rb, line 11
def line
  @lexer.line
end
offset() click to toggle source

The column number of the parser's current position.

@return [Fixnum]

# File lib/sass/script/parser.rb, line 18
def offset
  @lexer.offset
end
parse() click to toggle source

Parses a SassScript expression.

@return [Script::Tree::Node] The root node of the parse tree @raise [Sass::SyntaxError] if the expression isn't valid SassScript

# File lib/sass/script/parser.rb, line 62
def parse
  expr = assert_expr :expr
  assert_done
  expr.options = @options
  check_for_interpolation expr
  expr
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end
parse_function_definition_arglist() click to toggle source

Parses the argument list for a function definition.

@return [(Array<Script::Tree::Node>, Script::Tree::Node)]

The root nodes of the arguments, and the splat argument.

@raise [Sass::SyntaxError] if the argument list isn't valid SassScript

# File lib/sass/script/parser.rb, line 169
def parse_function_definition_arglist
  args, splat = defn_arglist!(true)
  assert_done

  args.each do |k, v|
    check_for_interpolation k
    k.options = @options

    if v
      check_for_interpolation v
      v.options = @options
    end
  end

  if splat
    check_for_interpolation splat
    splat.options = @options
  end

  return args, splat
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end
parse_interpolated(warn_for_color = false) click to toggle source

Parses a SassScript expression within an interpolated segment (`#{}`). This means that it stops when it comes across an unmatched `}`, which signals the end of an interpolated segment, it returns rather than throwing an error.

@param warn_for_color [Boolean] Whether raw color values passed to

interoplation should cause a warning.

@return [Script::Tree::Node] The root node of the parse tree @raise [Sass::SyntaxError] if the expression isn't valid SassScript

# File lib/sass/script/parser.rb, line 43
def parse_interpolated(warn_for_color = false)
  # Start two characters back to compensate for #{
  start_pos = Sass::Source::Position.new(line, offset - 2)
  expr = assert_expr :expr
  assert_tok :end_interpolation
  expr = Sass::Script::Tree::Interpolation.new(
    nil, expr, nil, !:wb, !:wa, :warn_for_color => warn_for_color)
  check_for_interpolation expr
  expr.options = @options
  node(expr, start_pos)
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end
parse_mixin_definition_arglist() click to toggle source

Parses the argument list for a mixin definition.

@return [(Array<Script::Tree::Node>, Script::Tree::Node)]

The root nodes of the arguments, and the splat argument.

@raise [Sass::SyntaxError] if the argument list isn't valid SassScript

# File lib/sass/script/parser.rb, line 139
def parse_mixin_definition_arglist
  args, splat = defn_arglist!(false)
  assert_done

  args.each do |k, v|
    check_for_interpolation k
    k.options = @options

    if v
      check_for_interpolation v
      v.options = @options
    end
  end

  if splat
    check_for_interpolation splat
    splat.options = @options
  end

  return args, splat
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end
parse_mixin_include_arglist() click to toggle source

Parses the argument list for a mixin include.

@return [(Array<Script::Tree::Node>,

       {String => Script::Tree::Node},
       Script::Tree::Node,
       Script::Tree::Node)]
The root nodes of the positional arguments, keyword arguments, and
splat argument(s). Keyword arguments are in a hash from names to values.

@raise [Sass::SyntaxError] if the argument list isn't valid SassScript

# File lib/sass/script/parser.rb, line 100
def parse_mixin_include_arglist
  args, keywords = [], {}
  if try_tok(:lparen)
    args, keywords, splat, kwarg_splat = mixin_arglist
    assert_tok(:rparen)
  end
  assert_done

  args.each do |a|
    check_for_interpolation a
    a.options = @options
  end

  keywords.each do |k, v|
    check_for_interpolation v
    v.options = @options
  end

  if splat
    check_for_interpolation splat
    splat.options = @options
  end

  if kwarg_splat
    check_for_interpolation kwarg_splat
    kwarg_splat.options = @options
  end

  return args, keywords, splat, kwarg_splat
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end
parse_string() click to toggle source

Parse a single string value, possibly containing interpolation. Doesn't assert that the scanner is finished after parsing.

@return [Script::Tree::Node] The root node of the parse tree. @raise [Sass::SyntaxError] if the string isn't valid SassScript

# File lib/sass/script/parser.rb, line 199
def parse_string
  unless (peek = @lexer.peek) &&
      (peek.type == :string ||
      (peek.type == :funcall && peek.value.downcase == 'url'))
    lexer.expected!("string")
  end

  expr = assert_expr :funcall
  check_for_interpolation expr
  expr.options = @options
  @lexer.unpeek!
  expr
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end
parse_until(tokens) click to toggle source

Parses a SassScript expression, ending it when it encounters one of the given identifier tokens.

@param tokens [#include?(String)] A set of strings that delimit the expression. @return [Script::Tree::Node] The root node of the parse tree @raise [Sass::SyntaxError] if the expression isn't valid SassScript

# File lib/sass/script/parser.rb, line 79
def parse_until(tokens)
  @stop_at = tokens
  expr = assert_expr :expr
  assert_done
  expr.options = @options
  check_for_interpolation expr
  expr
rescue Sass::SyntaxError => e
  e.modify_backtrace :line => @lexer.line, :filename => @options[:filename]
  raise e
end

Private Instance Methods

arglist(subexpr, description) click to toggle source
# File lib/sass/script/parser.rb, line 553
def arglist(subexpr, description)
  args = []
  keywords = Sass::Util::NormalizedMap.new
  e = send(subexpr)

  return [args, keywords] unless e

  splat = nil
  loop do
    if @lexer.peek && @lexer.peek.type == :colon
      name = e
      @lexer.expected!("comma") unless name.is_a?(Tree::Variable)
      assert_tok(:colon)
      value = assert_expr(subexpr, description)

      if keywords[name.name]
        raise SyntaxError.new("Keyword argument \"#{name.to_sass}\" passed more than once")
      end

      keywords[name.name] = value
    else
      if try_tok(:splat)
        return args, keywords, splat, e if splat
        splat, e = e, nil
      elsif splat
        raise SyntaxError.new("Only keyword arguments may follow variable arguments (...).")
      elsif !keywords.empty?
        raise SyntaxError.new("Positional arguments must come before keyword arguments.")
      end

      args << e if e
    end

    return args, keywords, splat unless try_tok(:comma)
    e = assert_expr(subexpr, description)
  end
end
assert_done() click to toggle source
# File lib/sass/script/parser.rb, line 700
def assert_done
  return if @lexer.done?
  @lexer.expected!(EXPR_NAMES[:default])
end
assert_expr(name, expected = nil) click to toggle source
# File lib/sass/script/parser.rb, line 670
def assert_expr(name, expected = nil)
  e = send(name)
  return e if e
  @lexer.expected!(expected || EXPR_NAMES[name] || EXPR_NAMES[:default])
end
assert_tok(name) click to toggle source
# File lib/sass/script/parser.rb, line 676
def assert_tok(name)
  # Avoids an array allocation caused by argument globbing in assert_toks.
  t = try_tok(name)
  return t if t
  @lexer.expected!(Lexer::TOKEN_NAMES[name] || name.to_s)
end
assert_toks(*names) click to toggle source
# File lib/sass/script/parser.rb, line 683
def assert_toks(*names)
  t = try_toks(*names)
  return t if t
  @lexer.expected!(names.map {|tok| Lexer::TOKEN_NAMES[tok] || tok}.join(" or "))
end
check_for_interpolation(node) click to toggle source

Checks a script node for any immediately-deprecated interpolations, and emits warnings for them.

@param node [Sass::Script::Tree::Node]

# File lib/sass/script/parser.rb, line 741
def check_for_interpolation(node)
  nodes = [node]
  until nodes.empty?
    node = nodes.pop
    unless node.is_a?(Sass::Script::Tree::Interpolation) &&
           node.deprecation == :immediate
      nodes.concat node.children
      next
    end

    interpolation_deprecation(node)
  end
end
defn_arglist!(must_have_parens) click to toggle source
# File lib/sass/script/parser.rb, line 514
def defn_arglist!(must_have_parens)
  if must_have_parens
    assert_tok(:lparen)
  else
    return [], nil unless try_tok(:lparen)
  end
  return [], nil if try_tok(:rparen)

  res = []
  splat = nil
  must_have_default = false
  loop do
    c = assert_tok(:const)
    var = node(Script::Tree::Variable.new(c.value), c.source_range)
    if try_tok(:colon)
      val = assert_expr(:space)
      must_have_default = true
    elsif try_tok(:splat)
      splat = var
      break
    elsif must_have_default
      raise SyntaxError.new(
        "Required argument #{var.inspect} must come before any optional arguments.")
    end
    res << [var, val]
    break unless try_tok(:comma)
  end
  assert_tok(:rparen)
  return res, splat
end
expr() click to toggle source
# File lib/sass/script/parser.rb, line 331
def expr
  start_pos = source_position
  e = interpolation
  return unless e
  list e, start_pos
end
fn_arglist() click to toggle source
# File lib/sass/script/parser.rb, line 545
def fn_arglist
  arglist(:equals, "function argument")
end
funcall() click to toggle source
# File lib/sass/script/parser.rb, line 505
def funcall
  tok = try_tok(:funcall)
  return raw unless tok
  args, keywords, splat, kwarg_splat = fn_arglist
  assert_tok(:rparen)
  node(Script::Tree::Funcall.new(tok.value, args, keywords, splat, kwarg_splat),
    tok.source_range.start_pos, source_position)
end
ident() click to toggle source
# File lib/sass/script/parser.rb, line 487
def ident
  return funcall unless @lexer.peek && @lexer.peek.type == :ident
  return if @stop_at && @stop_at.include?(@lexer.peek.value)

  name = @lexer.next
  if (color = Sass::Script::Value::Color::COLOR_NAMES[name.value.downcase])
    literal_node(Sass::Script::Value::Color.new(color, name.value), name.source_range)
  elsif name.value == "true"
    literal_node(Sass::Script::Value::Bool.new(true), name.source_range)
  elsif name.value == "false"
    literal_node(Sass::Script::Value::Bool.new(false), name.source_range)
  elsif name.value == "null"
    literal_node(Sass::Script::Value::Null.new, name.source_range)
  else
    literal_node(Sass::Script::Value::String.new(name.value, :identifier), name.source_range)
  end
end
interpolation(first = space) click to toggle source
# File lib/sass/script/parser.rb, line 408
def interpolation(first = space)
  e = first
  while (interp = try_tok(:begin_interpolation))
    wb = @lexer.whitespace?(interp)
    char_before = @lexer.char(interp.pos - 1)
    mid = assert_expr :expr
    assert_tok :end_interpolation
    wa = @lexer.whitespace?
    char_after = @lexer.char

    after = space
    before_deprecation = e.is_a?(Script::Tree::Interpolation) ? e.deprecation : :none
    after_deprecation = after.is_a?(Script::Tree::Interpolation) ? after.deprecation : :none

    deprecation =
      if before_deprecation == :immediate || after_deprecation == :immediate ||
         # Warn for #{foo}$var and #{foo}(1) but not #{$foo}1.
         (after && !wa && char_after =~ /[$(]/) ||
         # Warn for $var#{foo} and (a)#{foo} but not a#{foo}.
         (e && !wb && is_unsafe_before?(e, char_before))
        :immediate
      else
        :potential
      end

    e = node(
      Script::Tree::Interpolation.new(e, mid, after, wb, wa, :deprecation => deprecation),
      (e || interp).source_range.start_pos)
  end
  e
end
interpolation_deprecation(interpolation) click to toggle source

Emits a deprecation warning for an interpolation node.

@param node [Sass::Script::Tree::Node]

# File lib/sass/script/parser.rb, line 758
      def interpolation_deprecation(interpolation)
        return if @options[:_convert]
        location = "on line #{interpolation.line}"
        location << " of #{interpolation.filename}" if interpolation.filename
        Sass::Util.sass_warn <<WARNING
DEPRECATION WARNING #{location}: \#{} interpolation near operators will be simplified
in a future version of Sass. To preserve the current behavior, use quotes:

  #{interpolation.to_quoted_equivalent.to_sass}

You can use the sass-convert command to automatically fix most cases.
WARNING
      end
is_unsafe_before?(expr, char_before) click to toggle source

Returns whether `expr` is unsafe to include before an interpolation.

@param expr [Node] The expression to check. @param char_before [String] The character immediately before the

interpolation being checked (and presumably the last character of
`expr`).

@return [Boolean]

# File lib/sass/script/parser.rb, line 447
def is_unsafe_before?(expr, char_before)
  # If the previous expression is an identifier or number, it's safe
  # unless it was wrapped in parentheses.
  if expr.is_a?(Script::Tree::Literal) &&
     (expr.value.is_a?(Script::Value::Number) ||
      (expr.value.is_a?(Script::Value::String) && expr.value.type == :identifier))
    return char_before == ')'
  end

  # Otherwise, it's only safe if it was another interpolation.
  !expr.is_a?(Script::Tree::Interpolation)
end
lexer_class() click to toggle source

@private

# File lib/sass/script/parser.rb, line 307
def lexer_class; Lexer; end
list(first, start_pos) click to toggle source
# File lib/sass/script/parser.rb, line 338
def list(first, start_pos)
  return first unless @lexer.peek && @lexer.peek.type == :comma

  list = node(Sass::Script::Tree::ListLiteral.new([first], :comma), start_pos)
  while (tok = try_tok(:comma))
    element_before_interp = list.elements.length == 1 ? list.elements.first : list
    if (interp = try_op_before_interp(tok, element_before_interp))
      other_interp = try_ops_after_interp([:comma], :expr, interp)
      return interp unless other_interp
      return other_interp
    end
    return list unless (e = interpolation)
    list.elements << e
    list.source_range.end_pos = list.elements.last.source_range.end_pos
  end
  list
end
literal() click to toggle source
# File lib/sass/script/parser.rb, line 653
def literal
  t = try_tok(:color)
  return literal_node(t.value, t.source_range) if t
end
literal_node(value, source_range_or_start_pos, end_pos = source_position) click to toggle source

@overload node(value, source_range)

@param value [Sass::Script::Value::Base]
@param source_range [Sass::Source::Range]

@overload node(value, start_pos, end_pos = #source_position)

@param value [Sass::Script::Value::Base]
@param start_pos [Sass::Source::Position]
@param end_pos [Sass::Source::Position]
# File lib/sass/script/parser.rb, line 712
def literal_node(value, source_range_or_start_pos, end_pos = source_position)
  node(Sass::Script::Tree::Literal.new(value), source_range_or_start_pos, end_pos)
end
map() click to toggle source
# File lib/sass/script/parser.rb, line 309
def map
  start_pos = source_position
  e = interpolation
  return unless e
  return list e, start_pos unless @lexer.peek && @lexer.peek.type == :colon

  pair = map_pair(e)
  map = node(Sass::Script::Tree::MapLiteral.new([pair]), start_pos)
  while try_tok(:comma)
    pair = map_pair
    return map unless pair
    map.pairs << pair
  end
  map
end
map_pair(key = nil) click to toggle source
# File lib/sass/script/parser.rb, line 325
def map_pair(key = nil)
  return unless key ||= interpolation
  assert_tok :colon
  return key, assert_expr(:interpolation)
end
mixin_arglist() click to toggle source
# File lib/sass/script/parser.rb, line 549
def mixin_arglist
  arglist(:interpolation, "mixin argument")
end
node(node, source_range_or_start_pos, end_pos = source_position) click to toggle source

@overload node(node, source_range)

@param node [Sass::Script::Tree::Node]
@param source_range [Sass::Source::Range]

@overload node(node, start_pos, end_pos = #source_position)

@param node [Sass::Script::Tree::Node]
@param start_pos [Sass::Source::Position]
@param end_pos [Sass::Source::Position]
# File lib/sass/script/parser.rb, line 723
def node(node, source_range_or_start_pos, end_pos = source_position)
  source_range =
    if source_range_or_start_pos.is_a?(Sass::Source::Range)
      source_range_or_start_pos
    else
      range(source_range_or_start_pos, end_pos)
    end

  node.line = source_range.start_pos.line
  node.source_range = source_range
  node.filename = @options[:filename]
  node
end
number() click to toggle source
# File lib/sass/script/parser.rb, line 638
def number
  tok = try_tok(:number)
  return selector unless tok
  num = tok.value
  num.options = @options
  num.original = num.to_s
  literal_node(num, tok.source_range.start_pos)
end
paren() click to toggle source
# File lib/sass/script/parser.rb, line 610
def paren
  return variable unless try_tok(:lparen)
  start_pos = source_position
  e = map
  e.force_division! if e
  end_pos = source_position
  assert_tok(:rparen)
  e || node(Sass::Script::Tree::ListLiteral.new([], nil), start_pos, end_pos)
end
range(start_pos, end_pos = source_position) click to toggle source
# File lib/sass/script/parser.rb, line 302
def range(start_pos, end_pos = source_position)
  Sass::Source::Range.new(start_pos, end_pos, @options[:filename], @options[:importer])
end
raw() click to toggle source
# File lib/sass/script/parser.rb, line 591
def raw
  tok = try_tok(:raw)
  return special_fun unless tok
  literal_node(Script::Value::String.new(tok.value), tok.source_range)
end
selector() click to toggle source
# File lib/sass/script/parser.rb, line 647
def selector
  tok = try_tok(:selector)
  return literal unless tok
  node(tok.value, tok.source_range.start_pos)
end
source_position() click to toggle source
# File lib/sass/script/parser.rb, line 298
def source_position
  Sass::Source::Position.new(line, offset)
end
space() click to toggle source
# File lib/sass/script/parser.rb, line 460
def space
  start_pos = source_position
  e = or_expr
  return unless e
  arr = [e]
  while (e = or_expr)
    arr << e
  end
  if arr.size == 1
    arr.first
  else
    node(Sass::Script::Tree::ListLiteral.new(arr, :space), start_pos)
  end
end
special_fun() click to toggle source
# File lib/sass/script/parser.rb, line 597
def special_fun
  first = try_tok(:special_fun)
  return paren unless first
  str = literal_node(first.value, first.source_range)
  return str unless try_tok(:string_interpolation)
  mid = assert_expr :expr
  assert_tok :end_interpolation
  last = assert_expr(:special_fun)
  node(
    Tree::Interpolation.new(str, mid, last, !:wb, !:wa),
    first.source_range.start_pos)
end
string() click to toggle source
# File lib/sass/script/parser.rb, line 627
def string
  first = try_tok(:string)
  return number unless first
  str = literal_node(first.value, first.source_range)
  return str unless try_tok(:string_interpolation)
  mid = assert_expr :expr
  assert_tok :end_interpolation
  last = assert_expr(:string)
  node(Tree::StringInterpolation.new(str, mid, last), first.source_range.start_pos)
end
try_op_before_interp(op, prev = nil, after_interp = false) click to toggle source
# File lib/sass/script/parser.rb, line 358
def try_op_before_interp(op, prev = nil, after_interp = false)
  return unless @lexer.peek && @lexer.peek.type == :begin_interpolation
  unary = !prev && !after_interp
  wb = @lexer.whitespace?(op)
  str = literal_node(Script::Value::String.new(Lexer::OPERATORS_REVERSE[op.type]),
                     op.source_range)

  deprecation =
    case op.type
    when :comma; :potential
    when :div, :single_eq; :none
    when :plus; unary ? :none : :immediate
    when :minus; @lexer.whitespace?(@lexer.peek) ? :immediate : :none
    else; :immediate
    end

  interp = node(
    Script::Tree::Interpolation.new(
      prev, str, nil, wb, !:wa, :originally_text => true, :deprecation => deprecation),
    (prev || str).source_range.start_pos)
  interpolation(interp)
end
try_ops_after_interp(ops, name, prev = nil) click to toggle source
# File lib/sass/script/parser.rb, line 381
def try_ops_after_interp(ops, name, prev = nil)
  return unless @lexer.after_interpolation?
  op = try_toks(*ops)
  return unless op
  interp = try_op_before_interp(op, prev, :after_interp)
  return interp if interp

  wa = @lexer.whitespace?
  str = literal_node(Script::Value::String.new(Lexer::OPERATORS_REVERSE[op.type]),
                     op.source_range)
  str.line = @lexer.line

  deprecation =
    case op.type
    when :comma; :potential
    when :div, :single_eq; :none
    when :minus; @lexer.whitespace?(op) ? :immediate : :none
    else; :immediate
    end
  interp = node(
    Script::Tree::Interpolation.new(
      prev, str, assert_expr(name), !:wb, wa,
      :originally_text => true, :deprecation => deprecation),
    (prev || str).source_range.start_pos)
  interp
end
try_tok(name) click to toggle source
# File lib/sass/script/parser.rb, line 689
def try_tok(name)
  # Avoids an array allocation caused by argument globbing in the try_toks method.
  peeked = @lexer.peek
  peeked && name == peeked.type && @lexer.next
end
try_toks(*names) click to toggle source
# File lib/sass/script/parser.rb, line 695
def try_toks(*names)
  peeked = @lexer.peek
  peeked && names.include?(peeked.type) && @lexer.next
end
variable() click to toggle source
# File lib/sass/script/parser.rb, line 620
def variable
  start_pos = source_position
  c = try_tok(:const)
  return string unless c
  node(Tree::Variable.new(*c.value), start_pos)
end