Class: Udb::Yaml::PreservingEmitter

Inherits:
Object
  • Object
show all
Extended by:
T::Sig
Defined in:
lib/udb/yaml/preserving_emitter.rb

Overview

Emits YAML while preserving comments and formatting

Instance Method Summary collapse

Constructor Details

#initialize(comment_map = nil) ⇒ PreservingEmitter

Returns a new instance of PreservingEmitter.



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# File 'lib/udb/yaml/preserving_emitter.rb', line 19

def initialize(comment_map = nil)
  @comment_map = T.let(comment_map || CommentMap.new, CommentMap)
end

Instance Method Details

#emit(data, io = nil) ⇒ Object 



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# File 'lib/udb/yaml/preserving_emitter.rb', line 29

def emit(data, io = nil)
  output = StringIO.new

  @comment_map.header_comments.each do |comment|
    content = comment.content.strip
    output.puts "# #{content}" unless content.empty?
  end

  output.puts if @comment_map.header_comments.any?

  emit_value(data, output, [], 0)

  @comment_map.trailing_comments.each do |comment|
    output.puts "#{" " * comment.indent}# #{comment.content}"
  end

  source_locations = @comment_map.all_source_locations
  if source_locations.any?
    output.puts
    output.puts "# ===== SOURCE MAP BEGIN ====="
    output.puts "# This map tracks the original source file and line:column for each key"
    output.puts "# Format: key_path -> file:line:column"

    source_locations.keys.sort.each do |path_key|
      location = source_locations.fetch(path_key)
      output.puts "# #{path_key} -> #{location[:file]}:#{location[:line]}:#{location[:column]}"
    end

    output.puts "# ===== SOURCE MAP END ====="
  end

  result = output.string

  if io
    if io.is_a?(String)
      File.write(io, result)
    else
      io.write(result)
    end
  end

  result
end

#emit_file(data, file_path) ⇒ Object 



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# File 'lib/udb/yaml/preserving_emitter.rb', line 79

def emit_file(data, file_path)
  emit(data, file_path.to_s)
end