Class: Opal::Nodes::BlockNode
- Defined in:
- opal/lib/opal/nodes/definitions.rb
Constant Summary
Constants included from Helpers
Helpers::BASIC_IDENTIFIER_RULES , Helpers::ES3_RESERVED_WORD_EXCLUSIVE , Helpers::ES51_RESERVED_WORD , Helpers::IMMUTABLE_PROPS , Helpers::PROTO_SPECIAL_METHODS , Helpers::PROTO_SPECIAL_PROPS
Instance Attribute Summary
Attributes inherited from Base
Instance Method Summary collapse
- #child_is_expr?(child) ⇒ Boolean
- #compile ⇒ Object
-
#find_inline_yield(stmt) ⇒ Sexp
When a block sexp gets generated, any inline yields (i.e. yield statements that are not direct members of the block) need to be generated as a top level member.
- #raw_expression?(child) ⇒ Boolean
- #stmt_join ⇒ Object
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? , truthy_optimize? , #unshift , #while_loop , #with_temp , #wrap
Methods included from Helpers
#current_indent , #empty_line , #indent , #ivar , #js_falsy , #js_truthy , #js_truthy_optimize , #line , #lvar_to_js , #mid_to_jsid , #property , #valid_ivar_name? , #valid_name? , #variable
Constructor Details
This class inherits a constructor from Opal::Nodes::Base
Instance Method Details
#child_is_expr?(child) ⇒ Boolean
Returns:
- (Boolean)
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# File 'opal/lib/opal/nodes/definitions.rb', line 117 def child_is_expr?(child) raw_expression?(child) and [:stmt, :stmt_closure].include?(@level) end
#compile ⇒ Object
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# File 'opal/lib/opal/nodes/definitions.rb', line 97 def compile return push "nil" if children.empty? children.each_with_index do |child, idx| push stmt_join unless idx == 0 if yasgn = find_inline_yield(child) push compiler.process(yasgn, @level) push ";" end push compiler.process(child, @level) push ";" if child_is_expr?(child) end end
#find_inline_yield(stmt) ⇒ Sexp
When a block sexp gets generated, any inline yields (i.e. yield statements that are not direct members of the block) need to be generated as a top level member. This is because if a yield is returned by a break statement, then the method must return.
As inline expressions in javascript cannot return, the block must be rewritten.
For example, a yield inside an array:
[1, 2, 3, yield(4)]
Must be rewitten into:
tmp = yield 4
[1, 2, 3, tmp]
This rewriting happens on sexps directly.
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# File 'opal/lib/opal/nodes/definitions.rb', line 146 def find_inline_yield(stmt) found = nil case stmt.first when :js_return if found = find_inline_yield(stmt[1]) found = found[2] end when :array stmt[1..-1].each_with_index do |el, idx| if el.first == :yield found = el stmt[idx+1] = s(:js_tmp, '$yielded') end end when :call arglist = stmt[3] arglist[1..-1].each_with_index do |el, idx| if el.first == :yield found = el arglist[idx+1] = s(:js_tmp, '$yielded') end end end if found scope.add_temp '$yielded' unless scope.has_temp? '$yielded' s(:yasgn, '$yielded', found) end end
#raw_expression?(child) ⇒ Boolean
Returns:
- (Boolean)
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# File 'opal/lib/opal/nodes/definitions.rb', line 121 def raw_expression?(child) ![:xstr, :dxstr].include?(child.type) end
#stmt_join ⇒ Object
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# File 'opal/lib/opal/nodes/definitions.rb', line 113 def stmt_join scope.class_scope? ? "\n\n#{current_indent}" : "\n#{current_indent}" end