Class: Treetop::Runtime::SyntaxNode

### Home Classes Methods

### In Files

- lib/treetop/runtime/syntax_node.rb

### Parent

Object

### Methods

- ::new
- #<=>
- #dot_id
- #elements
- #empty?
- #extension_modules
- #inspect
- #nonterminal?
- #terminal?
- #text_value
- #write_dot
- #write_dot_file

### Files

- LICENSE

### Class/Module Index

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No matching classes.

# Treetop::Runtime::SyntaxNode

### Attributes

input[R]
interval[R]
parent[RW]

### Public Class Methods

new(input, interval, elements = nil) click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 7
    def initialize(input, interval, elements = nil)
      @input = input
      @interval = interval
      @elements = elements
    end

### Public Instance Methods

<=>(other) click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 45
    def <=>(other)
      self.interval.first <=> other.interval.first
    end

dot_id() click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 89
    def dot_id
      @dot_id ||= @@dot_id_counter += 1
    end

elements() click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 13
    def elements
      return @elements if terminal?
      # replace the character class placeholders in the sequence (lazy instantiation)
      last_element = nil
      @comprehensive_elements ||= @elements.map do |element|
        if element == true
          index = last_element ? last_element.interval.last : interval.first
          element = SyntaxNode.new(input, index...(index + 1))
        end
        element.parent = self
        last_element = element
      end

      @comprehensive_elements
    end

empty?() click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 41
    def empty?
      interval.first == interval.last && interval.exclude_end?
    end

extension_modules() click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 49
    def extension_modules
      local_extensions =
        class <<self
          included_modules-Object.included_modules
        end
      if local_extensions.size > 0
        local_extensions
      else
        []    # There weren't any; must be a literal node
      end
    end

inspect(indent="") click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 61
    def inspect(indent="")
      em = extension_modules
      interesting_methods = methods-[em.last ? em.last.methods : nil]-self.class.instance_methods
      im = interesting_methods.size > 0 ? " (#{interesting_methods.join(",")})" : ""
      tv = text_value
      tv = "...#{tv[-20..-1]}" if tv.size > 20

      indent +
      self.class.to_s.sub(/.*:/,'') +
        em.map{|m| "+"+m.to_s.sub(/.*:/,'')}*"" +
        " offset=#{interval.first}" +
        ", #{tv.inspect}" +
        im +
        (elements && elements.size > 0 ?
          ":" +
            (elements||[]).map{|e|
        begin
          "\n"+e.inspect(indent+"  ")
        rescue  # Defend against inspect not taking a parameter
          "\n"+indent+" "+e.inspect
        end
            }.join("") :
          ""
        )
    end

nonterminal?() click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 33
    def nonterminal?
      !terminal?
    end

terminal?() click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 29
    def terminal?
      @elements.nil?
    end

text_value() click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 37
    def text_value
      input[interval]
    end

write_dot(io) click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 93
    def write_dot(io)
      io.puts "node#{dot_id} [label=\"'#{text_value}'\"];"
      if nonterminal? then
        elements.each do
          |x|
          io.puts "node#{dot_id} -> node#{x.dot_id};"
          x.write_dot(io)
        end
      end
    end

write_dot_file(fname) click to toggle source

    # File lib/treetop/runtime/syntax_node.rb, line 104
    def write_dot_file(fname)
      File.open(fname + ".dot","w") do
        |file|
        file.puts "digraph G {"
        write_dot(file)
        file.puts "}"
      end
    end

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