class Prism::DesugarCompiler
DesugarCompiler
is a compiler that desugars Ruby code into a more primitive form. This is useful for consumers that want to deal with fewer node types.
Public Instance Methods
@@foo &&= bar
becomes
@@foo && @@foo = bar
# File prism/desugar_compiler.rb, line 12 def visit_class_variable_and_write_node(node) desugar_and_write_node(node, ClassVariableReadNode, ClassVariableWriteNode, node.name) end
@@foo += bar
becomes
@@foo = @@foo + bar
# File prism/desugar_compiler.rb, line 30 def visit_class_variable_operator_write_node(node) desugar_operator_write_node(node, ClassVariableReadNode, ClassVariableWriteNode, node.name) end
@@foo ||= bar
becomes
defined?(@@foo) ? @@foo : @@foo = bar
# File prism/desugar_compiler.rb, line 21 def visit_class_variable_or_write_node(node) desugar_or_write_defined_node(node, ClassVariableReadNode, ClassVariableWriteNode, node.name) end
Foo &&= bar
becomes
Foo && Foo = bar
# File prism/desugar_compiler.rb, line 39 def visit_constant_and_write_node(node) desugar_and_write_node(node, ConstantReadNode, ConstantWriteNode, node.name) end
Foo += bar
becomes
Foo = Foo + bar
# File prism/desugar_compiler.rb, line 57 def visit_constant_operator_write_node(node) desugar_operator_write_node(node, ConstantReadNode, ConstantWriteNode, node.name) end
Foo ||= bar
becomes
defined?(Foo) ? Foo : Foo = bar
# File prism/desugar_compiler.rb, line 48 def visit_constant_or_write_node(node) desugar_or_write_defined_node(node, ConstantReadNode, ConstantWriteNode, node.name) end
$foo &&= bar
becomes
$foo && $foo = bar
# File prism/desugar_compiler.rb, line 66 def visit_global_variable_and_write_node(node) desugar_and_write_node(node, GlobalVariableReadNode, GlobalVariableWriteNode, node.name) end
$foo += bar
becomes
$foo = $foo + bar
# File prism/desugar_compiler.rb, line 84 def visit_global_variable_operator_write_node(node) desugar_operator_write_node(node, GlobalVariableReadNode, GlobalVariableWriteNode, node.name) end
$foo ||= bar
becomes
defined?($foo) ? $foo : $foo = bar
# File prism/desugar_compiler.rb, line 75 def visit_global_variable_or_write_node(node) desugar_or_write_defined_node(node, GlobalVariableReadNode, GlobalVariableWriteNode, node.name) end
@foo &&= bar
becomes
@foo && @foo = bar
# File prism/desugar_compiler.rb, line 93 def visit_instance_variable_and_write_node(node) desugar_and_write_node(node, InstanceVariableReadNode, InstanceVariableWriteNode, node.name) end
@foo += bar
becomes
@foo = @foo + bar
# File prism/desugar_compiler.rb, line 111 def visit_instance_variable_operator_write_node(node) desugar_operator_write_node(node, InstanceVariableReadNode, InstanceVariableWriteNode, node.name) end
@foo ||= bar
becomes
@foo || @foo = bar
# File prism/desugar_compiler.rb, line 102 def visit_instance_variable_or_write_node(node) desugar_or_write_node(node, InstanceVariableReadNode, InstanceVariableWriteNode, node.name) end
foo &&= bar
becomes
foo && foo = bar
# File prism/desugar_compiler.rb, line 120 def visit_local_variable_and_write_node(node) desugar_and_write_node(node, LocalVariableReadNode, LocalVariableWriteNode, node.name, node.depth) end
foo += bar
becomes
foo = foo + bar
# File prism/desugar_compiler.rb, line 138 def visit_local_variable_operator_write_node(node) desugar_operator_write_node(node, LocalVariableReadNode, LocalVariableWriteNode, node.name, node.depth) end
foo ||= bar
becomes
foo || foo = bar
# File prism/desugar_compiler.rb, line 129 def visit_local_variable_or_write_node(node) desugar_or_write_node(node, LocalVariableReadNode, LocalVariableWriteNode, node.name, node.depth) end
Private Instance Methods
Desugar ‘x &&= y` to `x && x = y`
# File prism/desugar_compiler.rb, line 145 def desugar_and_write_node(node, read_class, write_class, *arguments) AndNode.new( read_class.new(*arguments, node.name_loc), write_class.new(*arguments, node.name_loc, node.value, node.operator_loc, node.location), node.operator_loc, node.location ) end
Desugar ‘x += y` to `x = x + y`
# File prism/desugar_compiler.rb, line 155 def desugar_operator_write_node(node, read_class, write_class, *arguments) write_class.new( *arguments, node.name_loc, CallNode.new( 0, read_class.new(*arguments, node.name_loc), nil, node.operator_loc.slice.chomp("="), node.operator_loc.copy(length: node.operator_loc.length - 1), nil, ArgumentsNode.new(0, [node.value], node.value.location), nil, nil, node.location ), node.operator_loc.copy(start_offset: node.operator_loc.end_offset - 1, length: 1), node.location ) end
Desugar ‘x ||= y` to `defined?(x) ? x : x = y`
# File prism/desugar_compiler.rb, line 187 def desugar_or_write_defined_node(node, read_class, write_class, *arguments) IfNode.new( node.operator_loc, DefinedNode.new(nil, read_class.new(*arguments, node.name_loc), nil, node.operator_loc, node.name_loc), node.operator_loc, StatementsNode.new([read_class.new(*arguments, node.name_loc)], node.location), ElseNode.new( node.operator_loc, StatementsNode.new( [write_class.new(*arguments, node.name_loc, node.value, node.operator_loc, node.location)], node.location ), node.operator_loc, node.location ), node.operator_loc, node.location ) end
Desugar ‘x ||= y` to `x || x = y`
# File prism/desugar_compiler.rb, line 177 def desugar_or_write_node(node, read_class, write_class, *arguments) OrNode.new( read_class.new(*arguments, node.name_loc), write_class.new(*arguments, node.name_loc, node.value, node.operator_loc, node.location), node.operator_loc, node.location ) end