Class: Opal::Nodes::CaseNode

Inherits:
Base show all
Defined in:
opal/lib/opal/nodes/case.rb

Constant Summary

Constants included from Helpers

Helpers::BASIC_IDENTIFIER_RULES, Helpers::ES3_RESERVED_WORD_EXCLUSIVE, Helpers::ES51_RESERVED_WORD, Helpers::IMMUTABLE_PROPS

Instance Attribute Summary

Attributes inherited from Base

#compiler, #type

Instance Method Summary collapse

Methods inherited from Base

#add_gvar, #add_ivar, #add_local, #add_temp, children, #children, #compile_to_fragments, #error, #expr, #expr?, #expr_or_nil, #fragment, handle, handlers, #helper, #in_while?, #initialize, #process, #push, #recv, #recv?, #s, #scope, #stmt, #stmt?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Helpers

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

Constructor Details

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

Instance Method Details

#case_parts ⇒ Object 



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# File 'opal/lib/opal/nodes/case.rb', line 46

def case_parts
  children[1..-1]
end

#case_stmt ⇒ Object 



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# File 'opal/lib/opal/nodes/case.rb', line 50

def case_stmt
  compiler.case_stmt
end

#compile ⇒ Object 



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# File 'opal/lib/opal/nodes/case.rb', line 10

def compile
  handled_else = false

  compiler.in_case do
    if condition
      case_stmt[:cond] = true
      add_local '$case'

      push "$case = ", expr(condition), ";"
    end

    case_parts.each_with_index do |wen, idx|
      if wen and wen.type == :when
        compiler.returns(wen) if needs_closure?
        push "else " unless idx == 0
        push stmt(wen)
      elsif wen # s(:else)
        handled_else = true
        wen = compiler.returns(wen) if needs_closure?
        push "else {", stmt(wen), "}"
      end
    end

    # if we are having a closure, we must return a usable value
    if needs_closure? and !handled_else
      push "else { return nil }"
    end

    wrap '(function() {', '})()' if needs_closure?
  end
end

#needs_closure? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/case.rb', line 42

def needs_closure?
  !stmt?
end