Class: CSV::Parser::Scanner

Inherits:
StringScanner
  • Object
show all
Defined in:
lib/csv/parser.rb

Overview

CSV::Scanner receives a CSV output, scans it and return the content. It also controls the life cycle of the object with its methods keep_start, keep_end, keep_back, keep_drop.

Uses StringScanner (the official strscan gem). Strscan provides lexical scanning operations on a String. We inherit its object and take advantage on the methods. For more information, please visit: ruby-doc.org/stdlib-2.6.1/libdoc/strscan/rdoc/StringScanner.html

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ Scanner

Returns a new instance of Scanner.



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# File 'lib/csv/parser.rb', line 47

def initialize(*args)
  super
  @keeps = []
end

Instance Method Details

#each_line(row_separator) ⇒ Object 



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# File 'lib/csv/parser.rb', line 52

def each_line(row_separator)
  position = pos
  rest.each_line(row_separator) do |line|
    position += line.bytesize
    self.pos = position
    yield(line)
  end
end

#keep_back ⇒ Object 



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# File 'lib/csv/parser.rb', line 70

def keep_back
  self.pos = @keeps.pop
end

#keep_drop ⇒ Object 



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# File 'lib/csv/parser.rb', line 74

def keep_drop
  @keeps.pop
end

#keep_end ⇒ Object 



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# File 'lib/csv/parser.rb', line 65

def keep_end
  start = @keeps.pop
  string.byteslice(start, pos - start)
end

#keep_start ⇒ Object 



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# File 'lib/csv/parser.rb', line 61

def keep_start
  @keeps.push(pos)
end