Class: FastestCSV

Inherits:
Object
  • Object
show all
Defined in:
lib/fastest_csv.rb,
lib/fastest-csv/version.rb,
ext/csv_parser/parser.c

Constant Summary collapse

VERSION = 
"0.0.1"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(io) ⇒ FastestCSV

Returns a new instance of FastestCSV.



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# File 'lib/fastest_csv.rb', line 49

def initialize(io)
  @io = io
end

Class Method Details

.foreach(path, &block) ⇒ Object

This method opens an accounting file and passes each record to the provided block.



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# File 'lib/fastest_csv.rb', line 7

def self.foreach(path, &block)
  open(path) do |reader|
    reader.each(&block)
  end
end

.open(path, mode = "rb") ⇒ Object

This method opens a csv file. It will pass a Reader object to the provided block, or return a Reader object when no block is provided.



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# File 'lib/fastest_csv.rb', line 15

def self.open(path, mode = "rb")
  csv = new(File.open(path, mode))
  if block_given?
    begin
      yield csv
    ensure
      csv.close
    end
  else
    csv
  end
end

.parse(data, &block) ⇒ Object 



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# File 'lib/fastest_csv.rb', line 36

def self.parse(data, &block)
  csv = new(StringIO.new(data))
  if block.nil?
    begin
      csv.read
    ensure
      csv.close
    end
  else
    csv.each(&block)
  end
end

.parse_line(str) ⇒ Object 



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# File 'ext/csv_parser/parser.c', line 17

static VALUE parse_line(VALUE self, VALUE str)
{
    if (NIL_P(str))
        return Qnil;
    
    const char *ptr = RSTRING_PTR(str);
    int len = (int) RSTRING_LEN(str);  /* cast to prevent warning in 64-bit OS */

    if (len == 0)
        return Qnil;
    
    VALUE array = rb_ary_new2(DEF_ARRAY_LEN); 
    char value[len];  /* field value, no longer than line */
    int state = 0;
    int index = 0;
    int i;
    char c;
    for (i = 0; i < len; i++)
    {
        c = ptr[i];
        switch (c)
        {
            case ',':
                if (state == 0) {
                    rb_ary_push(array, (index == 0 ? Qnil: rb_str_new(value, index)));
                    index = 0;
                }
                else if (state == 1) {
                    value[index++] = c;
                }
                else if (state == 2) {
                    rb_ary_push(array, rb_str_new(value, index));
                    index = 0;
                    state = 0;  /* outside quoted */
                }
                break;
            case '"':
                if (state == 0) {
                    state = 1;  /* in quoted */
                }
                else if (state == 1) {
                    state = 2;  /* quote in quoted */
                }
                else if (state == 2) {
                    value[index++] = c;  /* escaped quote */
                    state = 1;  /* in quoted */
                }
                break;
            case 13:  /* \r */
            case 10:  /* \n */
                if (state == 1) { /* quoted */
                    value[index++] = c;
                }
                else {
                    /* only do first line */
                    i = len;
                }
                /* else eat it ??? or return so far */
                break;
            default:
                value[index++] = c;
        }
    }
    
    if (state == 0) {
        rb_ary_push(array, (index == 0 ? Qnil: rb_str_new(value, index)));
    }
    else if (state == 2) {
        rb_ary_push(array, rb_str_new(value, index));
    }
    return array;
}

.read(path) ⇒ Object 



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# File 'lib/fastest_csv.rb', line 28

def self.read(path)
  open(path, "rb") { |csv| csv.read }
end

.readlines(path) ⇒ Object 



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# File 'lib/fastest_csv.rb', line 32

def self.readlines(path)
  read(path)
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/fastest_csv.rb', line 76

def close
  @io.close
end

#closed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fastest_csv.rb', line 80

def closed?
  @io.closed?
end

#each ⇒ Object 



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# File 'lib/fastest_csv.rb', line 53

def each
  while row = shift
    yield row
  end
end

#read ⇒ Object Also known as: readlines 



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# File 'lib/fastest_csv.rb', line 59

def read
  table = Array.new
  each {|row| table << row}
  table
end

#shift ⇒ Object Also known as: gets, readline 



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# File 'lib/fastest_csv.rb', line 66

def shift
  if line = @io.gets
    FastestCSV.parse_line(line)
  else
    nil
  end
end