Class: Shirobai::Cop::Style::RedundantSelfAssignment

Inherits:
RuboCop::Cop::Base
  • Object
show all
Extended by:
RuboCop::Cop::AutoCorrector
Defined in:
lib/shirobai/cop/style/redundant_self_assignment.rb

Overview

Drop-in Rust reimplementation of ‘Style/RedundantSelfAssignment`.

Detection and autocorrect both happen in Rust; Ruby turns each tuple into an offense and a ‘corrector.replace` / `corrector.remove` op. `METHODS_RETURNING_SELF` is closed and copied verbatim into the Rust rule, so the cop is config-less (`bundle_args` returns `[]`).

Two ‘kind`s of offenses come back:

  • ‘kind = 0` (variable assignment, `var = var.<METHOD!>(…)`): replace `[range_start, range_end)` with `source` (drop the `var = ` prefix, leave the rhs source intact — stock does the same via `corrector.replace(node, rhs.source)`).

  • ‘kind = 1` (setter, `obj.foo = obj.foo.<METHOD!>(…)`): delete `[range_start, range_end)`, which is the `obj.foo = ` prefix (stock’s ‘corrector.remove(range_between(node_start, first_arg_start))`).

Constant Summary collapse

MSG = 
"Redundant self assignment detected. " \
"Method `%<method_name>s` modifies its receiver in place."

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.badge ⇒ Object 



28
 
# File 'lib/shirobai/cop/style/redundant_self_assignment.rb', line 28

def self.badge = RuboCop::Cop::Badge.parse("Style/RedundantSelfAssignment")

.bundle_args(_config) ⇒ Object

Config-less from the Rust side — the destructive method set is a closed list in ‘crates/shirobai-core/src/rules/redundant_self_assignment.rs`.



32
 
# File 'lib/shirobai/cop/style/redundant_self_assignment.rb', line 32

def self.bundle_args(_config) = []

.cop_name ⇒ Object 



27
 
# File 'lib/shirobai/cop/style/redundant_self_assignment.rb', line 27

def self.cop_name = "Style/RedundantSelfAssignment"

Instance Method Details

#on_new_investigation ⇒ Object 



34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'lib/shirobai/cop/style/redundant_self_assignment.rb', line 34

def on_new_investigation
  offenses = Dispatch.offenses_for(processed_source, config, :redundant_self_assignment)
  return if offenses.empty?

  off = SourceOffsets.for(processed_source.raw_source)
  buffer = processed_source.buffer
  source = processed_source.raw_source

  offenses.each do |op_start, op_end, method_name, kind, range_start, range_end, rhs_start, rhs_end|
    op_range = Parser::Source::Range.new(buffer, off[op_start], off[op_end])
    message = format(MSG, method_name: method_name)
    add_offense(op_range, message: message) do |corrector|
      target = Parser::Source::Range.new(buffer, off[range_start], off[range_end])
      if kind == 0
        # Variable assignment: replace the whole `var = var.foo(args)`
        # node with the rhs source `var.foo(args)`.
        replacement = source.byteslice(rhs_start, rhs_end - rhs_start)
        corrector.replace(target, replacement)
      else
        # Setter: remove the `obj.foo = ` prefix in place.
        corrector.remove(target)
      end
    end
  end
end