Module: Evilution::AST::HeredocSpan

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

Overview

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 



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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