Module: Evilution::AST::HeredocSpan Private

Defined in:
lib/evilution/ast/heredoc_span.rb

Overview

This module is part of a private API. You should avoid using this module if possible, as it may be removed or be changed in the future.

Computes the byte-length needed for a mutation whose target range contains heredoc anchors (<<~MARKER / <<-MARKER / <<MARKER).

Prism reports a heredoc anchor's location as the inline range of just <<~MARKER — the body lines and the closing terminator live in closing_loc which is on a later line. An operator that builds a byte edit from the anchor's inline range (e.g. argument_removal using node.arguments.location) covers the anchor but leaves the body+terminator in place, producing an orphaned heredoc fragment that the parser rejects.

extend_length walks the supplied AST node for heredoc descendants whose anchor falls inside [offset, offset + length) and returns a length wide enough to also cover those descendants' closing_loc.end_offset — so the mutation's replacement replaces the heredoc body and terminator along with the anchor.

Class Method Summary collapse

Class Method Details

.extend_length(node:, offset:, length:) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/evilution/ast/heredoc_span.rb', line 25

def extend_length(node:, offset:, length:)
  return length if node.nil?

  end_offset = offset + length
  max_end = end_offset
  Walker.new(offset, end_offset) do |closing_end|
    max_end = closing_end if closing_end > max_end
  end.visit(node)
  max_end - offset
end