Class: Perforce2Svn::Mapping::Lexer

Inherits:
Object
  • Object
show all
Defined in:
lib/perforce2svn/mapping/lexer.rb

Instance Method Summary collapse

Constructor Details

#initialize(content) ⇒ Lexer

Returns a new instance of Lexer.



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# File 'lib/perforce2svn/mapping/lexer.rb', line 23

def initialize(content)
  @content = content
end

Instance Method Details

#each(&block) ⇒ Object

Yields each parsed line of the configuration



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# File 'lib/perforce2svn/mapping/lexer.rb', line 28

def each(&block)
  if not block_given?
    raise ArgumentError, "Requires a block"
  end

  lines = @content.readlines
  i = 1
  continues_from_previous = false
  previous = []
  
  lines.each do |line|
    parts= tokenize(line)

    will_continue_on_next_line = false
    if line =~ /\\\s*$/
      will_continue_on_next_line = true
    end

    if parts.length > 0
      if continues_from_previous
        previous << parts
      else
        previous = []
        name = parts.shift
        yield Token.new(name, parts, i)
      end
    end

    continues_from_previous = will_continue_on_next_line
    i += 1
  end
end

#tokenize(line) ⇒ Object

Reads a line for all of the possible tokens



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# File 'lib/perforce2svn/mapping/lexer.rb', line 62

def tokenize(line)
  chars = line.scan(/./)
  parts = []
  
  part = ""
  i = 0
  while i < chars.length
    current = chars[i]
    if current == '\\'
      nxt = chars[i + 1]
      if nxt == ' '
        i += 1
        part << ' '
      elsif nxt == "\n"
        break
      end
    elsif current == ' '
      if part.length > 0
        parts << part
        part = ""
      end
    elsif current == '#'
      break
    else
      part << current
    end

    i += 1
  end

  if not parts[-1].eql?(part)
    parts << part
  end

  parts.delete_if {|p| p =~ /^\s*$/}
  parts
end