Module: SimpleCov::Combine::MethodsCombiner

Defined in:
lib/simplecov/combine/methods_combiner.rb

Overview

Combine different method coverage results on a single file.

Should be called through SimpleCov.combine.

Class Method Summary collapse

Class Method Details

.combine(coverage_a, coverage_b) ⇒ Hash

Return merged methods or the existing methods if other is missing.

Method coverage maps [class, name, start_line, start_col, end_line, end_col] keys to hit counts. Keys are matched on their SOURCE identity — (name, location), ignoring the class element — because Ruby records one entry per receiver: the same define_method block defined onto different classes in different processes arrives with different (normalized) receivers for the same source method, and matching on the full key would keep both, letting a never-called receiver's 0 shadow a covered method after merge (issue #1234). Combining sums the hit counts for matching methods and preserves methods that only appear in one result.

Returns:

  • (Hash) 


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# File 'lib/simplecov/combine/methods_combiner.rb', line 30

def combine(coverage_a, coverage_b)
  merged = {} #: Hash[untyped, [untyped, Integer]]
  [coverage_a, coverage_b].each_with_object(merged) do |coverage, memo|
    coverage.each do |key, count|
      method_key = source_identity(key)
      retained_key, existing = memo[method_key] || [key, 0]
      memo[method_key] = [retained_key, existing + count]
    end
  end

  merged.values.to_h
end

.source_identity(key) ⇒ Object 



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# File 'lib/simplecov/combine/methods_combiner.rb', line 43

def source_identity(key)
  _class_name, *identity = SourceFile::RubyDataParser.call(key)
  identity
end