Module: Equalshares::Pabulib::Writer

Defined in:
lib/equalshares/pabulib/writer.rb

Overview

Serialises an Instance back to pabulib (.pb) text. Inverse of the parser: META / PROJECTS / VOTES sections, ';'-separated, with fields containing ';', '"' or newlines quoted (and embedded '"' doubled). Parsing the result yields an equivalent Instance (round-trip safe).

Class Method Summary collapse

Class Method Details

.escape(value) ⇒ Object

Inverse of the CSV field handling in Pabulib::Csv.parse_line.



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# File 'lib/equalshares/pabulib/writer.rb', line 36

def escape(value)
  str = value.to_s
  return str unless str.match?(/[;"\n]/)

  %("#{str.gsub('"', '""')}")
end

.write_file(instance, path) ⇒ Object 



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# File 'lib/equalshares/pabulib/writer.rb', line 20

def write_file(instance, path)
  File.write(path, write_string(instance))
end

.write_section(lines, header_name, rows_by_id) ⇒ Object 



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# File 'lib/equalshares/pabulib/writer.rb', line 24

def write_section(lines, header_name, rows_by_id)
  lines << header_name
  return if rows_by_id.empty?

  header = rows_by_id.values.first.keys
  lines << header.map { |h| escape(h) }.join(";")
  rows_by_id.each_value do |row|
    lines << header.map { |h| escape(row[h]) }.join(";")
  end
end

.write_string(instance) ⇒ Object 



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# File 'lib/equalshares/pabulib/writer.rb', line 12

def write_string(instance)
  lines = ["META", "key;value"]
  instance.meta.each { |key, value| lines << "#{escape(key)};#{escape(value)}" }
  write_section(lines, "PROJECTS", instance.projects)
  write_section(lines, "VOTES", instance.votes)
  "#{lines.join("\n")}\n"
end