Module: HashEngine::CSVParse

Included in:
HashEngine, Transform
Defined in:
lib/hash_engine/csv_parse.rb

Constant Summary collapse

QUOTE_CHAR = 
'"'.freeze
DEFAULT_DELIMITER = 
','.freeze
QUOTED_FIELD = 
Regexp.new /^"(.*)"$/

Instance Method Summary collapse

Instance Method Details

#parse_line(line, headers, delimiter = DEFAULT_DELIMITER) ⇒ Object 



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
 
# File 'lib/hash_engine/csv_parse.rb', line 14

def parse_line(line, headers, delimiter=DEFAULT_DELIMITER)
  delimiter = DEFAULT_DELIMITER if delimiter.empty?
  result = {:error => []}
  unless line.empty?
    parse = line.chomp
    csv           = Array.new
    current_field = String.new
    field_quotes  = 0
    parse.split(delimiter, -1).each do |match|
      if current_field.empty? && match.count(QUOTE_CHAR).zero?
        csv           << (match.empty? ? nil : match)
      else
        current_field << match
        field_quotes += match.count(QUOTE_CHAR)
        if field_quotes % 2 == 0
          in_quotes = current_field[QUOTED_FIELD, 1] || current_field
          current_field = in_quotes
          current_field.gsub!(QUOTE_CHAR * 2, QUOTE_CHAR) # unescape contents
          csv           << current_field
          current_field =  String.new
          field_quotes  =  0
        else # we found a quoted field that spans multiple lines
          current_field << delimiter
        end
      end
    end
    if csv.size == headers.size
      headers.each_with_index {|name, index| result[name] = csv[index] }
    else
      result[:error] = ["header.size: #{headers.size} parsed_data.size: #{csv.size}"]
    end
  end
  result
end