Class: Kwalify::BaseParser

Inherits:
Object
  • Object
show all
Defined in:
lib/kwalify/parser/base.rb

Overview

base class for Yaml::Parser

Direct Known Subclasses

Yaml::Parser

Constant Summary collapse

CHAR_TABLE = 
{ "\""=>"\"", "\\"=>"\\", "n"=>"\n", "r"=>"\r", "t"=>"\t", "b"=>"\b" }

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#column ⇒ Object (readonly)

Returns the value of attribute column.



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# File 'lib/kwalify/parser/base.rb', line 25

def column
  @column
end

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/kwalify/parser/base.rb', line 25

def filename
  @filename
end

#linenum ⇒ Object (readonly)

Returns the value of attribute linenum.



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# File 'lib/kwalify/parser/base.rb', line 25

def linenum
  @linenum
end

Instance Method Details

#_getch ⇒ Object 



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# File 'lib/kwalify/parser/base.rb', line 67

def _getch
  ch = @scanner.getch()
  if ch == "\n"
    @linenum += 1
    @column = 0
  else
    @column += 1
  end
  return ch
end

#_set_column_and_linenum(s) ⇒ Object 



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# File 'lib/kwalify/parser/base.rb', line 36

def _set_column_and_linenum(s)
  pos = s.rindex(?\n)
  if pos
    @column = s.length - pos
    @linenum += s.count("\n")
  else
    @column += s.length
  end
end

#eos? ⇒ Boolean

Returns:



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# File 'lib/kwalify/parser/base.rb', line 57

def eos?
  return @scanner.eos?
end

#group(n) ⇒ Object 



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# File 'lib/kwalify/parser/base.rb', line 52

def group(n)
  return @scanner[n]
end

#match?(regexp) ⇒ Boolean

Returns:



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# File 'lib/kwalify/parser/base.rb', line 47

def match?(regexp)
  return @scanner.match?(regexp)
end

#peep(n = 1) ⇒ Object 



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# File 'lib/kwalify/parser/base.rb', line 62

def peep(n=1)
  return @scanner.peep(n)
end

#reset(input, filename = nil, untabify = false) ⇒ Object 



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# File 'lib/kwalify/parser/base.rb', line 18

def reset(input, filename=nil, untabify=false)
  input = Kwalify::Util.untabify(input) if untabify
  @scanner = StringScanner.new(input)
  @filename = filename
  @linenum = 1
  @column  = 1
end

#scan(regexp) ⇒ Object 



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# File 'lib/kwalify/parser/base.rb', line 28

def scan(regexp)
  ret = @scanner.scan(regexp)
  return nil if ret.nil?
  _set_column_and_linenum(ret)
  return ret
end

#scan_string ⇒ Object 



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# File 'lib/kwalify/parser/base.rb', line 81

def scan_string
  ch = _getch()
  ch == '"' || ch == "'" or raise "assertion error"
  endch = ch
  s = ''
  while !(ch = _getch()).nil? && ch != endch
    if ch != '\\'
      s << ch
    elsif (ch = _getch()).nil?
      raise _syntax_error("%s: string is not closed." % (endch == '"' ? "'\"'" : '"\'"'))
    elsif endch == '"'
      if CHAR_TABLE.key?(ch)
        s << CHAR_TABLE[ch]
      elsif ch == 'u'
        ch2 = scan(/(?:[0-9a-f][0-9a-f]){1,4}/)
        unless ch2
          raise _syntax_error("\\x: invalid unicode format.")
        end
        s << [ch2.hex].pack('U*')
      elsif ch == 'x'
        ch2 = scan(/[0-9a-zA-Z][0-9a-zA-Z]/)
        unless ch2
          raise _syntax_error("\\x: invalid binary format.")
        end
        s << [ch2].pack('H2')
      else
        s << "\\" << ch
      end
    elsif endch == "'"
      ch == '\'' || ch == '\\' ? s << ch : s << '\\' << ch
    else
      raise "unreachable"
    end
  end
  #_getch()
  return s
end