Module: Opal::MagicComments

Defined in:
opal/lib/opal/magic_comments.rb

Constant Summary collapse

MAGIC_COMMENT_RE =
/\A# *(\w+) *: *(\S+.*?) *$/.freeze
EMACS_MAGIC_COMMENT_RE =
/\A# *-\*- *(\w+) *: *(\S+.*?) *-\*- *$/.freeze

Class Method Summary collapse

Class Method Details

.parse(sexp, comments) ⇒ Object


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# File 'opal/lib/opal/magic_comments.rb', line 7

def self.parse(sexp, comments)
  flags = {}

  # We have an upper limit at the first line of code
  if sexp
    first_line = sexp.loc.line
    comments = comments.take(first_line)
  end

  comments.each do |comment|
    next if first_line && comment.loc.line >= first_line

    if (parts = comment.text.scan(MAGIC_COMMENT_RE)).any? ||
       (parts = comment.text.scan(EMACS_MAGIC_COMMENT_RE)).any?
      parts.each do |key, value|
        flags[key.to_sym] =
          case value
          when 'true' then true
          when 'false' then false
          else value
          end
      end
    end
  end

  flags
end