Class: Opal::Nodes::CaseNode

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

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, #class_variable_owner, #class_variable_owner_nesting_level, #comments, #compile_to_fragments, #error, #expr, #expr?, #expr_or_nil, #fragment, handle, handlers, #has_rescue_else?, #helper, #in_ensure, #in_ensure?, #in_while?, #initialize, #process, #push, #recv, #recv?, #s, #scope, #stmt, #stmt?, truthy_optimize?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Helpers

#conditional_send, #current_indent, #empty_line, #indent, #js_falsy, #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

#case_partsObject


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# File 'opal/lib/opal/nodes/case.rb', line 56

def case_parts
  children[1..-1]
end

#case_stmtObject


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# File 'opal/lib/opal/nodes/case.rb', line 60

def case_stmt
  compiler.case_stmt
end

#compileObject


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# File 'opal/lib/opal/nodes/case.rb', line 12

def compile
  compiler.in_case do
    compile_code

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

#compile_codeObject


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# File 'opal/lib/opal/nodes/case.rb', line 20

def compile_code
  handled_else = false

  if condition
    case_stmt[:cond] = true
    add_local '$case'

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

  case_parts.each_with_index do |wen, idx|
    next unless wen
    line
    case wen.type
    when :when
      wen = compiler.returns(wen) if needs_closure?
      push 'else ' unless idx == 0
      push stmt(wen)
    else # 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? && !handled_else
    line
    push 'else { return nil }'
  end
end

#needs_closure?Boolean

Returns:

  • (Boolean)

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# File 'opal/lib/opal/nodes/case.rb', line 52

def needs_closure?
  !stmt?
end