Class: Rubinius::ToolSet.current::TS::AST::SingleBlockArg
- Inherits:
-
SendWithArguments
- Object
- Node
- Send
- SendWithArguments
- Rubinius::ToolSet.current::TS::AST::SingleBlockArg
- Defined in:
- lib/rubinius/ast/transforms.rb
Overview
Handles Rubinius.single_block_arg
Given the following code:
m { |x| ... }
In Ruby 1.8, this has the following semantics:
* x == nil if no values are yielded
* x == val if one value is yielded
* x == [p, q, r, ...] if more than one value is yielded
* x == [a, b, c, ...] if one Array is yielded
In Ruby 1.9, this has the following semantics:
* x == nil if no values are yielded
* x == val if one value is yielded
* x == p if yield(p, q, r, ...)
* x == [a, b, c, ...] if one Array is yielded
However, in Ruby 1.9, the Enumerator code manually implements the 1.8 block argument semantics. This transform exposes the VM instruction we use in 1.8 mode (cast_for_single_block_arg) so we can use it in 1.9 mode for Enumerator.
Instance Attribute Summary
Attributes inherited from SendWithArguments
Attributes inherited from Send
#block, #name, #privately, #receiver, #variable, #vcall_style
Attributes inherited from Node
Class Method Summary collapse
Instance Method Summary collapse
Methods inherited from SendWithArguments
Methods inherited from Send
#arguments_sexp, #check_local_reference, #defined, #initialize, #receiver_sexp, #sexp_name, #to_sexp, #value_defined
Methods inherited from Node
#ascii_graph, #attributes, #children, #defined, #initialize, match_arguments?, match_send?, #new_block_generator, #new_generator, #node_name, #or_bytecode, #pos, #set_child, #to_sexp, #transform, transform, transform_comment, transform_kind, transform_kind=, transform_name, #value_defined, #visit, #walk
Constructor Details
This class inherits a constructor from Rubinius::ToolSet.current::TS::AST::SendWithArguments
Class Method Details
.match?(line, receiver, name, arguments, privately) ⇒ Boolean
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# File 'lib/rubinius/ast/transforms.rb', line 179 def self.match?(line, receiver, name, arguments, privately) match_send? receiver, :Rubinius, name, :single_block_arg end |
Instance Method Details
#bytecode(g) ⇒ Object
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# File 'lib/rubinius/ast/transforms.rb', line 183 def bytecode(g) if @arguments.splat? raise CompileError, "splat argument passed to single_block_arg" elsif @block raise CompileError, "block passed to single_block_arg" end pos(g) g.cast_for_single_block_arg end |