Class: Opal::Nodes::DefinedNode

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# File 'opal/lib/opal/nodes/defined.rb', line 12
def compile
 case value.type
 when :self, :nil, :false, :true
 push value.type.to_s.inspect
 when :lvasgn, :ivasgn, :gvasgn, :cvasgn, :casgn, :op_asgn, :or_asgn, :and_asgn
 push "'assignment'"
 when :lvar
 push "'local-variable'"
 when :begin
 if value.children.size == 1 && value.children[0].type == :masgn
 push "'assignment'"
 else
 push "'expression'"
 end
 when :send
 compile_defined_send(value)
 wrap '(', " ? 'method' : nil)"
 when :ivar
 compile_defined_ivar(value)
 wrap '(', " ? 'instance-variable' : nil)"
 when :zsuper, :super
 compile_defined_super
 when :yield
 compile_defined_yield
 wrap '(', " ? 'yield' : nil)"
 when :xstr
 compile_defined_xstr(value)
 when :const
 compile_defined_const(value)
 wrap '(', " ? 'constant' : nil)"
 when :cvar
 compile_defined_cvar(value)
 wrap '(', " ? 'class variable' : nil)"
 when :gvar
 compile_defined_gvar(value)
 wrap '(', " ? 'global-variable' : nil)"
 when :back_ref
 compile_defined_back_ref
 wrap '(', " ? 'global-variable' : nil)"
 when :nth_ref
 compile_defined_nth_ref
 wrap '(', " ? 'global-variable' : nil)"
 when :array
 compile_defined_array(value)
 wrap '(', " ? 'expression' : nil)"
 else
 push "'expression'"
 end
end

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# File 'opal/lib/opal/nodes/defined.rb', line 62
def compile_defined(node)
 type = node.type
 if respond_to? "compile_defined_#{type}"
 __send__("compile_defined_#{type}", node)
 else
 node_tmp = scope.new_temp
 push "(#{node_tmp} = ", expr(node), ')'
 node_tmp
 end
end

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# File 'opal/lib/opal/nodes/defined.rb', line 215
def compile_defined_array(node)
 node.children.each_with_index do |child, idx|
 push ' && ' unless idx == 0
 compile_defined(child)
 end
end

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# File 'opal/lib/opal/nodes/defined.rb', line 200
def compile_defined_back_ref
 helper :gvars
 back_ref_temp = scope.new_temp
 push "(#{back_ref_temp} = $gvars['~'], #{back_ref_temp} != null && #{back_ref_temp} !== nil)"
 back_ref_temp
end

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# File 'opal/lib/opal/nodes/defined.rb', line 162
def compile_defined_const(node)
 const_scope, const_name = *node
 const_tmp = scope.new_temp
 if const_scope.nil?
 push "(#{const_tmp} = #{scope.relative_access}('#{const_name}', 'skip_raise'))"
 elsif const_scope == s(:cbase)
 push "(#{const_tmp} = #{top_scope.absolute_const}('::', '#{const_name}', 'skip_raise'))"
 else
 const_scope_tmp = compile_defined(const_scope)
 push " && (#{const_tmp} = #{top_scope.absolute_const}(#{const_scope_tmp}, '#{const_name}', 'skip_raise'))"
 end
 const_tmp
end

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# File 'opal/lib/opal/nodes/defined.rb', line 178
def compile_defined_cvar(node)
 cvar_name, _ = *node
 cvar_tmp = scope.new_temp
 push "(#{cvar_tmp} = #{class_variable_owner}.$$cvars['#{cvar_name}'], #{cvar_tmp} != null)"
 cvar_tmp
end

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# File 'opal/lib/opal/nodes/defined.rb', line 185
def compile_defined_gvar(node)
 helper :gvars
 name = node.children[0].to_s[1..-1]
 gvar_temp = scope.new_temp
 if %w[~!].include? name
 push "(#{gvar_temp} = ", expr(node), ' || true)'
 else
 push "(#{gvar_temp} = $gvars[#{name.inspect}], #{gvar_temp} != null)"
 end
 gvar_temp
end

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# File 'opal/lib/opal/nodes/defined.rb', line 135
def compile_defined_ivar(node)
 name = node.children[0].to_s[1..-1]
 # FIXME: this check should be positive for ivars initialized as nil too.
 # Since currently all known ivars are inialized to nil in the constructor
 # we can't tell if it was the user that put nil and made the ivar #defined?
 # or not.
 tmp = scope.new_temp
 push "(#{tmp} = #{scope.self}['#{name}'], #{tmp} != null && #{tmp} !== nil)"
 tmp
end

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# File 'opal/lib/opal/nodes/defined.rb', line 207
def compile_defined_nth_ref
 helper :gvars
 nth_ref_tmp = scope.new_temp
 push "(#{nth_ref_tmp} = $gvars['~'], #{nth_ref_tmp} != null && #{nth_ref_tmp} != nil)"
 nth_ref_tmp
end

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# File 'opal/lib/opal/nodes/defined.rb', line 94
def compile_defined_send(node)
 recv, method_name, *args = *node
 mid = mid_to_jsid(method_name.to_s)
 if recv
 recv_code = compile_defined(recv)
 push ' && '
 if recv.type == :send
 recv_code = compile_send_recv_doesnt_raise(recv_code)
 push ' && '
 end
 recv_tmp = scope.new_temp
 push "(#{recv_tmp} = ", recv_code, ", #{recv_tmp}) && "
 else
 recv_tmp = scope.self
 end
 recv_value_tmp = scope.new_temp
 push "(#{recv_value_tmp} = #{recv_tmp}) && "
 meth_tmp = scope.new_temp
 push "(((#{meth_tmp} = #{recv_value_tmp}#{mid}) && !#{meth_tmp}.$$stub)"
 push " || #{recv_value_tmp}['$respond_to_missing?']('#{method_name}'))"
 args.each do |arg|
 case arg.type
 when :block_pass
 # ignoring
 else
 push ' && '
 compile_defined(arg)
 end
 end
 wrap '(', ')'
 "#{meth_tmp}()"
end

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# File 'opal/lib/opal/nodes/defined.rb', line 147
def compile_defined_super
 push expr s(:defined_super)
end

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# File 'opal/lib/opal/nodes/defined.rb', line 158
def compile_defined_xstr(node)
 push '(typeof(', expr(node), ') !== "undefined")'
end

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# File 'opal/lib/opal/nodes/defined.rb', line 151
def compile_defined_yield
 scope.uses_block!
 block_name = scope.block_name || scope.find_parent_def.block_name
 push "(#{block_name} != null && #{block_name} !== nil)"
 block_name
end

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# File 'opal/lib/opal/nodes/defined.rb', line 90
def compile_send_recv_doesnt_raise(recv_code)
 wrap_with_try_catch(recv_code)
end

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# File 'opal/lib/opal/nodes/defined.rb', line 74
def wrap_with_try_catch(code)
 returning_tmp = scope.new_temp
 push "(#{returning_tmp} = (function() { try {"
 push " return #{code};"
 push '} catch ($err) {'
 push ' if (Opal.rescue($err, [Opal.Exception])) {'
 push ' try {'
 push ' return false;'
 push ' } finally { Opal.pop_exception($err); }'
 push ' } else { throw $err; }'
 push '}})())'
 returning_tmp
end