Class: Rubyang::Cli::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/rubyang/cli/parser.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/rubyang/cli/parser.rb', line 15

def initialize
end

Class Method Details

.parse(str) ⇒ Object 



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# File 'lib/rubyang/cli/parser.rb', line 10

def self.parse( str )
  parser = self.new
  parser.parse( str )
end

Instance Method Details

#next_token ⇒ Object 



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# File 'lib/rubyang/cli/parser.rb', line 64

def next_token
  #p @tokens.first
  @tokens.shift
end

#parse(str) ⇒ Object 



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# File 'lib/rubyang/cli/parser.rb', line 18

def parse( str )
  @tokens = Array.new

  s = StringScanner.new( str )

  keywords = {
  }

  scanre_list = [
    ["dqstr", /^"(?:[^"]|\\.)*"/],
    ["sqstr", /^'(?:[^']|\\.)*'/],
    ["nqstr", /^[a-zA-Z0-9:\/\|\.=_-]+/],
    ["wsp",   /^[ \t]+/],
  ]
  scanres = scanre_list.to_h

  scanre = Regexp.union( scanre_list.map{ |scanre| scanre[1] } )

  last = ''
  until s.eos?
    token = s.scan( scanre )
    case token
    when scanres["dqstr"] then
      token_ = token.gsub(/^"/,'').gsub(/"$/,'').gsub(/\\n/,"\n").gsub(/\\t/,"\t").gsub(/\\"/,"\"").gsub(/\\\\/,"\\")
      @tokens.push token_
      last = "dqstr"
    when scanres["sqstr"] then
      token_ = token.gsub(/^'/,'').gsub(/'$/,'')
      @tokens.push token_
      last = "sqstr"
    when scanres["nqstr"] then
      @tokens.push token
      last = "nqstr"
    when scanres["wsp"] then
      last = "wsp"
    else raise "token not match to any scanres: #{token.inspect}"
    end
  end
  if last == "wsp"
    @tokens.push ''
  end

  #result = self.do_parse
  return @tokens
end