Class: Opal::Nodes::Match3Node

Inherits:
Base
  • Object
show all
Defined in:
opal/lib/opal/nodes/call_special.rb

Overview

/regexp/ =~ rhs s(:match_with_lvasgn, lhs, rhs)

Instance Attribute Summary

Attributes inherited from Base

#compiler, #sexp, #type

Attributes included from Closure::NodeSupport

#closure

Instance Method Summary collapse

Methods inherited from Base

#add_gvar, #add_ivar, #add_local, #add_temp, #children, children, #class_variable_owner, #class_variable_owner_nesting_level, #comments, #compile_to_fragments, #error, #expr, #expr?, #expr_or_empty, #expr_or_nil, #fragment, handle, handlers, #has_rescue_else?, #helper, #in_ensure, #in_ensure?, #in_resbody, #in_resbody?, #in_rescue, #in_while?, #initialize, #process, #push, #recv, #recv?, #s, #scope, #source_location, #stmt, #stmt?, #top_scope, truthy_optimize?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Closure::NodeSupport

#closure_is?, #compile_catcher, #generate_thrower, #generate_thrower_without_catcher, #in_closure, #pop_closure, #push_closure, #select_closure, #thrower

Methods included from Helpers

#current_indent, #empty_line, #indent, #js_truthy, #js_truthy_optimize, #line, #mid_to_jsid, #property, #valid_name?

Constructor Details

This class inherits a constructor from Opal::Nodes::Base

Instance Method Details

#compile ⇒ Object 



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# File 'opal/lib/opal/nodes/call_special.rb', line 70

def compile
  sexp = s(:send, lhs, :=~, rhs)
  # Handle named matches like: /(?<abc>b)/ =~ 'b'
  if lhs.type == :regexp && lhs.children.first.type == :str
    re = lhs.children.first.children.first
    names = re.scan(/\(\?<([^>]*)>/).flatten.map(&:to_sym)
    unless names.empty?
      # $m3names = $~ ? $~.named_captures : {}
      names_def = s(:lvasgn, :$m3names,
        s(:if,
          s(:gvar, :$~),
          s(:send, s(:gvar, :$~), :named_captures),
          s(:hash)
        )
      )

      names = names.map do |name|
        # abc = $m3names[:abc]
        s(:lvasgn, name,
          s(:send,
            s(:lvar, :$m3names),
            :[],
            s(:sym, name)
          )
        )
      end

      if stmt?
        # We don't care about a return value of this one, so we
        # ignore it and just assign the local variables.
        #
        # (/(?<abc>b)/ =~ 'f')
        # $m3names = $~ ? $~.named_captures : {}
        # abc = $m3names[:abc]
        sexp = s(:begin, sexp, names_def, *names)
      else
        # We actually do care about a return value, so we must
        # keep it saved.
        #
        # $m3tmp = (/(?<abc>b)/ =~ 'f')
        # $m3names = $~ ? $~.named_captures : {}
        # abc = $m3names[:abc]
        # $m3tmp
        sexp = s(:begin,
          s(:lvasgn, :$m3tmp, sexp),
          names_def,
          *names,
          s(:lvar, :$m3tmp)
        )
      end
    end
  end
  push process(sexp, @level)
end