Class: Prism::Merge::BlockDirectiveDetector

Inherits:
Ruby::Merge::BlockDirectiveDetector
  • Object
show all
Defined in:
lib/prism/merge/block_directive_detector.rb

Overview

Prism-specific projection for Ruby block directive spans.

Ruby directive token detection lives in Ruby::Merge::BlockDirectiveDetector. This class only promotes detected spans into Prism merge nodes.

Instance Method Summary collapse

Instance Method Details

#promote_spans_to_nodes(statements, spans, analysis:) ⇒ Object 



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# File 'lib/prism/merge/block_directive_detector.rb', line 10

def promote_spans_to_nodes(statements, spans, analysis:)
  return statements if spans.empty?

  validate_same_syntactic_level!(spans, statements)

  top_level = top_level_spans_only(spans).reject do |span|
    statements.any? do |stmt|
      start_line = stmt_start_line(stmt)
      end_line = stmt_end_line(stmt)
      start_line && end_line && start_line <= span.start_line && end_line >= span.end_line
    end
  end

  return statements if top_level.empty?

  result = []
  used_indices = Set.new

  top_level.each do |span|
    inner_stmts = statements.each_with_index.select do |stmt, index|
      next false if used_indices.include?(index)

      start_line = stmt_start_line(stmt)
      end_line = stmt_end_line(stmt)
      start_line && end_line && start_line >= span.start_line && end_line <= span.end_line
    end.map { |stmt, index| [index, stmt] }

    inner_indices = inner_stmts.map(&:first)
    inner_nodes = inner_stmts.map(&:last)
    nested = spans.select do |candidate|
      candidate != span && candidate.start_line >= span.start_line && candidate.end_line <= span.end_line
    end
    inner_nodes = promote_spans_to_nodes(inner_nodes, nested, analysis: analysis) unless nested.empty?

    insert_at = if inner_indices.any?
                  inner_indices.min
                else
                  after_span = statements.each_with_index.find do |stmt, _|
                    stmt_start_line(stmt).to_i > span.start_line
                  end
                  after_span ? after_span.last : statements.length
                end

    result << [insert_at, build_directive_node(span, inner_nodes, analysis), inner_indices]
    used_indices.merge(inner_indices)
  end

  rebuild_statements(statements, result, used_indices)
end