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File Name : desugar_compiler.rb

# 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

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2024-08-16 06:43:05
..	dir	-	root/linksafe	0755	2024-08-16 06:43:12
parse_result	dir	-	root/linksafe	0755	2024-08-16 06:43:05
compiler.rb	text/x-ruby	14.88 KB	root/linksafe	0644	2024-07-23 12:52:46
debug.rb	text/x-ruby	6.12 KB	root/linksafe	0644	2024-07-23 12:52:46
desugar_compiler.rb	text/x-ruby	5.71 KB	root/linksafe	0644	2024-07-23 12:52:46
dispatcher.rb	text/x-ruby	108.9 KB	root/linksafe	0644	2024-07-23 12:52:46
dsl.rb	text/x-ruby	31.99 KB	root/linksafe	0644	2024-07-23 12:52:46
ffi.rb	text/x-ruby	10.27 KB	root/linksafe	0644	2024-07-23 12:52:46
lex_compat.rb	text/x-ruby	31.04 KB	root/linksafe	0644	2024-07-23 12:52:46
mutation_compiler.rb	text/x-ruby	20.81 KB	root/linksafe	0644	2024-07-23 12:52:46
node.rb	text/x-ruby	575.41 KB	root/linksafe	0644	2024-07-23 12:52:46
node_ext.rb	text/x-ruby	5.01 KB	root/linksafe	0644	2024-07-23 12:52:46
node_inspector.rb	text/x-ruby	2.06 KB	root/linksafe	0644	2024-07-23 12:52:46
pack.rb	text/x-ruby	5.77 KB	root/linksafe	0644	2024-07-23 12:52:46
parse_result.rb	text/x-ruby	13.43 KB	root/linksafe	0644	2024-07-23 12:52:46
pattern.rb	text/x-ruby	7.56 KB	root/linksafe	0644	2024-07-23 12:52:46
ripper_compat.rb	text/x-ruby	5.95 KB	root/linksafe	0644	2024-07-23 12:52:46
serialize.rb	text/x-ruby	56.71 KB	root/linksafe	0644	2024-07-23 12:52:46
visitor.rb	text/x-ruby	15.02 KB	root/linksafe	0644	2024-07-23 12:52:46