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|
# frozen_string_literal: true
module Prism
# 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.
class DesugarCompiler < MutationCompiler
# @@foo &&= bar
#
# becomes
#
# @@foo && @@foo = bar
def visit_class_variable_and_write_node(node)
desugar_and_write_node(node, ClassVariableReadNode, ClassVariableWriteNode, node.name)
end
# @@foo ||= bar
#
# becomes
#
# defined?(@@foo) ? @@foo : @@foo = bar
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
def visit_class_variable_operator_write_node(node)
desugar_operator_write_node(node, ClassVariableReadNode, ClassVariableWriteNode, node.name)
end
# Foo &&= bar
#
# becomes
#
# Foo && Foo = bar
def visit_constant_and_write_node(node)
desugar_and_write_node(node, ConstantReadNode, ConstantWriteNode, node.name)
end
# Foo ||= bar
#
# becomes
#
# defined?(Foo) ? Foo : Foo = bar
def visit_constant_or_write_node(node)
desugar_or_write_defined_node(node, ConstantReadNode, ConstantWriteNode, node.name)
end
# Foo += bar
#
# becomes
#
# Foo = Foo + bar
def visit_constant_operator_write_node(node)
desugar_operator_write_node(node, ConstantReadNode, ConstantWriteNode, node.name)
end
# $foo &&= bar
#
# becomes
#
# $foo && $foo = bar
def visit_global_variable_and_write_node(node)
desugar_and_write_node(node, GlobalVariableReadNode, GlobalVariableWriteNode, node.name)
end
# $foo ||= bar
#
# becomes
#
# defined?($foo) ? $foo : $foo = bar
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
def visit_global_variable_operator_write_node(node)
desugar_operator_write_node(node, GlobalVariableReadNode, GlobalVariableWriteNode, node.name)
end
# @foo &&= bar
#
# becomes
#
# @foo && @foo = bar
def visit_instance_variable_and_write_node(node)
desugar_and_write_node(node, InstanceVariableReadNode, InstanceVariableWriteNode, node.name)
end
# @foo ||= bar
#
# becomes
#
# @foo || @foo = bar
def visit_instance_variable_or_write_node(node)
desugar_or_write_node(node, InstanceVariableReadNode, InstanceVariableWriteNode, node.name)
end
# @foo += bar
#
# becomes
#
# @foo = @foo + bar
def visit_instance_variable_operator_write_node(node)
desugar_operator_write_node(node, InstanceVariableReadNode, InstanceVariableWriteNode, node.name)
end
# foo &&= bar
#
# becomes
#
# foo && foo = bar
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
def visit_local_variable_or_write_node(node)
desugar_or_write_node(node, LocalVariableReadNode, LocalVariableWriteNode, node.name, node.depth)
end
# foo += bar
#
# becomes
#
# foo = foo + bar
def visit_local_variable_operator_write_node(node)
desugar_operator_write_node(node, LocalVariableReadNode, LocalVariableWriteNode, node.name, node.depth)
end
private
# Desugar `x &&= y` to `x && x = y`
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`
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 `x || x = y`
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
# Desugar `x ||= y` to `defined?(x) ? x : x = y`
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
end
end
|
