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Class: CSV::Parser::Scanner

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, StringScanner
Instance Chain:
self, StringScanner
Inherits: StringScanner
  • Object
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

Class Method Summary

Instance Method Summary

Constructor Details

.new(*args) ⇒ Scanner

[ GitHub ] 

  


# File 'lib/csv/parser.rb', line 42



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


  







Instance Method Details



  

    #each_line(row_separator)  
  

  [ GitHub ]


  

  


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



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  
  

  [ GitHub ]


  

  


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



def keep_back
  self.pos = @keeps.pop
end


  








  

    #keep_drop  
  

  [ GitHub ]


  

  


# File 'lib/csv/parser.rb', line 69



def keep_drop
  @keeps.pop
end


  








  

    #keep_end  
  

  [ GitHub ]


  

  


# File 'lib/csv/parser.rb', line 60



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


  








  

    #keep_start  
  

  [ GitHub ]


  

  


# File 'lib/csv/parser.rb', line 56



def keep_start
  @keeps.push(pos)
end


  








  

    #scan_all  
  

  [ GitHub ]


  

  


# File 'lib/csv/parser.rb', line 40



alias_method :scan_all, :scan