Class: Opal::Nodes::RescueNode

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

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

#body_code ⇒ Object 



171
172
173
174
175
 
# File 'lib/opal/nodes/rescue.rb', line 171

def body_code
  body_code = (body.nil? || body.type == :resbody ? s(:nil) : body)
  body_code = compiler.returns(body_code) unless stmt?
  body_code
end

#compile ⇒ Object 



97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
 
# File 'lib/opal/nodes/rescue.rb', line 97

def compile
  scope.rescue_else_sexp = children[1..-1].detect { |sexp| sexp && sexp.type != :resbody }
  _has_rescue_handlers = false

  if handle_rescue_else_manually?
    line 'var $no_errors = true;'
  end

  closure_type = Closure::NONE
  closure_type |= Closure::JS_FUNCTION if expr? || recv?
  if has_retry?
    closure_type |= Closure::JS_LOOP        \
                 |  Closure::JS_LOOP_INSIDE \
                 |  Closure::RESCUE_RETRIER
  end
  push_closure(closure_type) if closure_type != Closure::NONE

  in_rescue(self) do
    push 'try {'
    indent do
      line stmt(body_code)
    end
    line '} catch ($err) {'

    indent do
      if has_rescue_else?
        line '$no_errors = false;'
      end

      children[1..-1].each_with_index do |child, idx|
        # counting only rescue, ignoring rescue-else statement
        next unless child && child.type == :resbody
        _has_rescue_handlers = true

        push ' else ' unless idx == 0
        line process(child, @level)
      end

      # if no resbodys capture our error, then rethrow
      push ' else { throw $err; }'
    end

    line '}'

    if handle_rescue_else_manually?
      # here we must add 'finally' explicitly
      push 'finally {'
      indent do
        line 'if ($no_errors) { '
        indent do
          line stmt(rescue_else_code)
        end
        line '}'
      end
      push '}'
    end
  end

  pop_closure if closure_type != Closure::NONE

  wrap 'do { ', ' break; } while(1)' if has_retry?

  # Wrap a try{} catch{} into a function
  # when it's an expression
  # or when there's a method call after begin;rescue;end
  if expr? || recv?
    if scope.await_encountered
      wrap '(await (async function() { ', '})())'
    else
      wrap '(function() { ', '})()'
    end
  end
end

#handle_rescue_else_manually? ⇒ Boolean

Returns true when there's no 'ensure' statement wrapping current rescue.

Returns:

  • (Boolean) 


186
187
188
 
# File 'lib/opal/nodes/rescue.rb', line 186

def handle_rescue_else_manually?
  !in_ensure? && has_rescue_else?
end

#has_retry? ⇒ Boolean

Returns:

  • (Boolean) 


190
191
192
 
# File 'lib/opal/nodes/rescue.rb', line 190

def has_retry?
  @sexp.meta[:has_retry]
end

#rescue_else_code ⇒ Object 



177
178
179
180
181
 
# File 'lib/opal/nodes/rescue.rb', line 177

def rescue_else_code
  rescue_else_code = scope.rescue_else_sexp
  rescue_else_code = compiler.returns(rescue_else_code) unless stmt?
  rescue_else_code
end