Class: Crokus::AstPrinter

Inherits:
Object
  • Object
show all
Includes:
Indent
Defined in:
lib/crokus/ast_printer.rb

Constant Summary

Constants included from Indent

Indent::INDENT

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Indent

#dedent, #indent, #say

Instance Attribute Details

#code ⇒ Object

Returns the value of attribute code.



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# File 'lib/crokus/ast_printer.rb', line 12

def code
  @code
end

#nodes_cnx ⇒ Object

Returns the value of attribute nodes_cnx.



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# File 'lib/crokus/ast_printer.rb', line 12

def nodes_cnx
  @nodes_cnx
end

#nodes_decl ⇒ Object

Returns the value of attribute nodes_decl.



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# File 'lib/crokus/ast_printer.rb', line 12

def nodes_decl
  @nodes_decl
end

Instance Method Details

#clean(code) ⇒ Object

suppress syndrom : name=“”not correct“”



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# File 'lib/crokus/ast_printer.rb', line 75

def clean code
  #puts "=> cleaning dot code"
  code.lines.each_with_index do |line,idx|
    if line=~/\"\"(.*)\"\"/
      code.lines[idx].gsub!(/\"\"(.*)\"\"/,"\"#{$1}\"")
    end
  end
end

#print(ast) ⇒ Object

entry method



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# File 'lib/crokus/ast_printer.rb', line 14

def print ast #entry method
  @verbose=false
  @nodes_decl=Code.new
  @nodes_cnx=Code.new
  @printed_cnx={} #Cosmetic ! to keep track of already printed cnx source->sink
  @code=Code.new
  code << "digraph G {"
  code.indent=2
  code << "ordering=out;"
  code << "ranksep=.4;"
  code << "bgcolor=\"lightgrey\";"
  code.newline
  code << "node [shape=box, fixedsize=false, fontsize=12, fontname=\"Helvetica-bold\", fontcolor=\"blue\""
  code << "       width=.25, height=.25, color=\"black\", fillcolor=\"white\", style=\"filled, solid, bold\"];"
  code << "edge [arrowsize=.5, color=\"black\", style=\"bold\"]"
  process(ast)
  code << @nodes_decl
  code << @nodes_cnx
  code.indent=0
  code << "}"
  clean(code)
  return code
end

#process(node, level = 0) ⇒ Object 



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# File 'lib/crokus/ast_printer.rb', line 38

def process node,level=0
  #puts "processing #{node}"
  kname=node.class.name.split("::")[1]
  id=node.object_id
  (nodes_decl << "#{id} [label=\"#{kname}\"]")

  node.instance_variables.each{|vname|
    ivar=node.instance_variable_get(vname)
    vname=vname.to_s[1..-1]
    if ivar
      case ivar
      when Array
        ivar.each_with_index{|e,idx|
          sink=process(e,level+2)
          @printed_cnx[id]||=[]
          nodes_cnx << "#{id} -> #{sink} [label=\"#{vname}[#{idx}]\"]" if not @printed_cnx[id].include? sink
          @printed_cnx[id] << sink
        }
      when Token
        val=ivar.val
        sink="#{ivar.object_id}"
        nodes_decl << "#{sink} [label=\"#{val}\",color=\"red\"]"
        @printed_cnx[id]||=[]
        nodes_cnx << "#{id} -> #{sink} [label=\"#{vname}\"]" if not @printed_cnx[id].include? sink
        @printed_cnx[id] << sink
      else
        sink=process(ivar,level+2)
        @printed_cnx[id]||=[]
        nodes_cnx << "#{id} -> #{sink} [label=\"#{vname}\"]" if not @printed_cnx[id].include? sink
        @printed_cnx[id] << sink
      end
    end
  }
  return id
end