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ruby--ruby/ext/ripper/tools/dsl.rb
nobu b5be3e7893 dsl.rb: ID constants
* ext/ripper/tools/dsl.rb (DSL#method_missing): expand ID
  constnats without parentheses.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61975 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-01-20 05:39:02 +00:00

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1.2 KiB
Ruby

# Simple DSL implementation for Ripper code generation
#
# input: /*% ripper: stmts_add(stmts_new, void_stmt) %*/
# output: $$ = dispatch2(stmts_add, dispatch0(stmts_new), dispatch0(void_stmt))
class DSL
def initialize(code, options)
@events = {}
@error = options.include?("error")
@brace = options.include?("brace")
@final = options.include?("final")
@var_field_1 = options.include?("var_field_1")
# create $1 == "$1", $2 == "$2", ...
re, s = "", ""
1.upto(9) do |n|
re << "(..)"
s << "$#{ n }"
end
/#{ re }/ =~ s
@code = eval(code)
end
attr_reader :events
undef lambda
undef hash
undef class
def generate
s = "$$"
s = "p->result" if @final
s = "#{ s } = #@code;"
s << "ripper_error(p);" if @error
s = "{#{ s }}" if @brace
s = "$1 = var_field(p, $1);" + s if @var_field_1
"\t\t\t#{s}"
end
def method_missing(event, *args)
if event.to_s =~ /!\z/
event = $`
@events[event] = args.size
"dispatch#{ args.size }(#{ [event, *args].join(", ") })"
elsif args.empty? and /\Aid[A-Z]/ =~ event.to_s
event
else
"#{ event }(#{ args.join(", ") })"
end
end
def self.const_missing(name)
name
end
end