Prettify HTML

Format HTML with indentation for improved readability and debugging.

Code

Utilities

result = []
level = 0
void_tags = %w[area base br col embed hr img input link meta param source track wbr]

html.scan(/<[^>]+>|[^<]+/).each do |token|
  text = token.strip
  next if text.empty?

  if text.start_with?('</')
    level -= 1
    result << (' ' * (level * indent)) + text
  elsif text.start_with?('<')
    result << (' ' * (level * indent)) + text
    tag = text.match(/<(\w+)/)[1].downcase
    level += 1 unless void_tags.include?(tag) || text.end_with?('/>')
  else
    result << (' ' * (level * indent)) + text
  end
end

return result.join("\n")

Parameters

html(string)

HTML string to format.

indent(number)

Number of spaces for indentation.

Server

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