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, #closest_module_node, #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_parts ⇒ Object 



56
57
58
 
# File 'opal/lib/opal/nodes/case.rb', line 56

def case_parts
  children[1..-1]
end

#case_stmt ⇒ Object 



60
61
62
 
# File 'opal/lib/opal/nodes/case.rb', line 60

def case_stmt
  compiler.case_stmt
end

#compile ⇒ Object 



11
12
13
14
15
16
17
 
# File 'opal/lib/opal/nodes/case.rb', line 11

def compile
  compiler.in_case do
    compile_code

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

#compile_code ⇒ Object 



19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'opal/lib/opal/nodes/case.rb', line 19

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|
    if 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
  end

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

#needs_closure? ⇒ Boolean

Returns:

  • (Boolean) 


52
53
54
 
# File 'opal/lib/opal/nodes/case.rb', line 52

def needs_closure?
  !stmt?
end