Class: Rogdl::Parser

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/parser.rb', line 23

def initialize
  @spaces = 0
  @lines = [[]]
  @prev_state = nil
  @escape = false
  @state = InLine
  @indenting = true
  @line_count = 0
end

Instance Attribute Details

#escape ⇒ Object

Returns the value of attribute escape.



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

def escape
  @escape
end

#indenting ⇒ Object

Returns the value of attribute indenting.



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

def indenting
  @indenting
end

#line_count ⇒ Object

Returns the value of attribute line_count.



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

def line_count
  @line_count
end

#lines ⇒ Object

Returns the value of attribute lines.



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

def lines
  @lines
end

#prev_state ⇒ Object

Returns the value of attribute prev_state.



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

def prev_state
  @prev_state
end

#spaces ⇒ Object

Returns the value of attribute spaces.



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

def spaces
  @spaces
end

#state ⇒ Object

Returns the value of attribute state.



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

def state
  @state
end

Class Method Details

.parse(text) ⇒ Object 



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# File 'lib/parser.rb', line 55

def Parser.parse(text)
  p = Parser.new
  p.translate(text)
  return p.convert
end

.parse_file(filename) ⇒ Object 



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# File 'lib/parser.rb', line 33

def Parser.parse_file(filename)
  file = File.new(filename)
  contents = ""
  file.each_byte do |ch|
    contents << ch
  end
  first_line = contents.split("\n").first
  schema = nil
  if first_line[0, SchemaString.length] == SchemaString
    schema = Schema.new(Parser.parse_file(first_line[SchemaString.length, first_line.length]))
  end
  node = Parser.parse(contents)
  if !schema.nil?
    messages = schema.validate(node);
    if messages.length > 0 
      puts filename + ' does not match the supplied schema'
      puts messages
    end
  end
  return node
end

Instance Method Details

#add_line ⇒ Object 



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# File 'lib/parser.rb', line 66

def add_line
  @lines << []
  @indenting = true
end

#append(char) ⇒ Object 



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

def append(char)
  @lines.last.last << char
  @indenting = false
end

#begin_string ⇒ Object

def end_string

  @lines.last << ''
end



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# File 'lib/parser.rb', line 99

def begin_string
  @lines.last << ''
end

#capture(state) ⇒ Object 



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# File 'lib/parser.rb', line 91

def capture(state)
  @prev_state = state
end

#changeto(state) ⇒ Object 



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# File 'lib/parser.rb', line 79

def changeto(state)
  @state = state
end

#complain(message) ⇒ Object 



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# File 'lib/parser.rb', line 83

def complain(message)
  raise message + "  line count: #{@line_count}"
end

#convert ⇒ Object 



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# File 'lib/parser.rb', line 343

def convert
  
  nodes = convert_nodes
  
  nodes.each_with_index do |line, i|
    first_in_line = nil
    line.each_with_index do |node, j|
      
      if !node.nil?
        
        if first_in_line.nil?
          first_in_line = node
          #find parent here

          nodes[0..i].reverse.each do |array|

            if !array[j-1].nil? && i != 0
              array[j-1].add(node)
              break
            end
          
          end

        else
          first_in_line.add(node)
        end
      end
    end
  end
#        puts parent.flatten.collect {|n| n.gname}
  return nodes[0][0]
end

#convert_nodes ⇒ Object 



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# File 'lib/parser.rb', line 376

def convert_nodes
  
  nodes = []
  
  @lines.each_with_index do |line, i|
    if line != []
      temp = []
      nodes << temp
      
      line.each_with_index do |name, j|
        temp[j] = name.to_n unless name.nil?
      end
    end
  end
  return nodes
end

#indent ⇒ Object 



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# File 'lib/parser.rb', line 71

def indent
  @lines.last << nil
end

#read(char) ⇒ Object 



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# File 'lib/parser.rb', line 104

def read(char)
  case
    when self.state == InLine
      read_line(char)
      
    when self.state == InString
      read_string(char)
      
    when self.state == InSQString
      read_sq_string(char)

    when self.state == InDQString
      read_dq_string(char)

    when self.state == InPhrase
      read_phrase(char)

    when self.state == InComment
      read_comment(char)

    else
      complain "unexpected state #{@state}"
  end #switch state
end

#read_comment(char) ⇒ Object 



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# File 'lib/parser.rb', line 330

def read_comment(char)
    case
      when char == "\n" # New Line
        add_line
        changeto(InLine)
      else
        # ignore characters
        
    end # switch
    
end

#read_dq_string(char) ⇒ Object

read_sq_string



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# File 'lib/parser.rb', line 305

def read_dq_string(char)
  case
    when char == '"' # Double Quotes
      if @escape
        append(char)
        @escape = false
      else
        changeto(@prev_state)
      end
      
    when char == '\\' # Escape
      @escape = true

    when char == "\n" # New Line
      complain "new line is unexpected"
      
    else             # Normal Character
      append(char)
      @escape = false
  end # switch
    
end

#read_line(char) ⇒ Object

read



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# File 'lib/parser.rb', line 129

def read_line(char)
    case
      when char == "'" # Single Quotes
        complain 'invalid indentation ' if @spaces != 0
        begin_string
        capture(InLine)
        changeto(InSQString)

      when char == '"' # Double Quotes
        complain 'invalid indentation ' if @spaces != 0
        begin_string
        capture(InLine)
        changeto(InDQString)
      
      when char == ' ' # Whitespace
        if @indenting
          @spaces += 1
          if @spaces == 4
            @spaces = 0
            indent
          end
        else
          # ignore in line whitespace
        end
      
      when char == '#' # Comment
        changeto(InComment)
      
      when char == "\t" # Tab
        complain "invalid number of white spaces" if @spaces != 0
        indent
        
      when char == "\n" # New Line
        add_line
        @line_count += 1
        @spaces = 0

      when char == "(" # Open parentheses
        count = 0
        @lines.last.each {|n| count += 1 if n.nil?}
        add_line
        indent
        count.times {indent}
        changeto(InPhrase)

      when char == ")" # Close parentheses
        complain "close parentheses is unexpected"

      when char == "," # Comma
        complain "comma is unexpected"

      else             # Normal Character
        complain "invalid indentation parsing character: #{char}" if @spaces != 0
        begin_string
        capture(InLine)
        changeto(InString)
        read(char)
        
    end # switch
    
end

#read_phrase(char) ⇒ Object

read_line



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# File 'lib/parser.rb', line 191

def read_phrase(char)

    case
      when char == "'" # Single Quotes
        capture(InPhrase)
        changeto(InSQString)
        begin_string

      when char == '"' # Double Quotes
        capture(InPhrase)
        changeto(InDQString)
        begin_string
      
      when char == ' ' # Whitespace
        # ignore whitespace
      
      when char == '#' # Comment
        complain "unexpected comment '#' in phrase"
      
      when char == "\t" # Tab
        # ignore Tab
        
      when char == "\n" # New Line
#              complain "unexpected new line character in phrase"
#              add_line
        changeto(InLine)
        read(char)

      when char == "(" # Open parentheses
        complain "Invalid open parentheses"

      when char == ")" # Close parentheses
        changeto(InLine)

      when char == "," # Comma
        count = 0
        @lines.last.each {|n| count += 1 if n.nil?}
        add_line              
        count.times {indent}

      else             # Normal Character
        capture(InPhrase)
        changeto(InString)
        begin_string
        read(char)
        
    end # switch
    
end

#read_sq_string(char) ⇒ Object 



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# File 'lib/parser.rb', line 282

def read_sq_string(char)
  case
    when char == "'" # Single Quotes
      if @escape
        append(char)
        @escape = false
      else
        changeto(@prev_state)
      end
      
    when char == '\\' # Escape
      @escape = true

    when char == "\n" # New Line
      complain "new line is unexpected"
      
    else             # Normal Character
      append(char)
      @escape = false
  end # switch
    
end

#read_string(char) ⇒ Object

read_phrase



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# File 'lib/parser.rb', line 241

def read_string(char)
    case
      when char == "'" # Single Quotes
        complain "single quotes not allowed inside of Node name"
        
      when char == '"' # Double Quotes
        complain "double quotes not allowed inside of Node name"
        
      when char == ' ' # Whitespace
        changeto(@prev_state)
        
      when char == '#' # Comment
        complain "double quotes not allowed inside of Node name"
        
      when char == '\\' # Escape
        complain "escape is not allowed inside of Node name"

      when char == "\t" # Tab
        complain "tabs not allowed inside of Node name"
        
      when char == "\n" # New Line
        changeto(InLine)
        add_line
        @line_count += 1

      when char == "," # Comma
        complain "unexpected comma" unless @prev_state == InPhrase
        changeto(InPhrase)
        read(char)

      when char == ")" # Close parentheses
        changeto(@prev_state)

      else             # Normal Character
        append(char)
    end # switch
    
end

#to_s ⇒ Object 



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# File 'lib/parser.rb', line 75

def to_s
  @lines.to_s
end

#translate(string) ⇒ Object 



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# File 'lib/parser.rb', line 87

def translate(string)
  string.length.times {|i| read(string[i,1])}
end