Exception: AmbigousParseException

Inherits:
Exception
  • Object
show all
Defined in:
lib/rpdf2txt-rockit/parsing_ambiguities.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(stringBeingParsed, fullTree, *alternativeTrees) ⇒ AmbigousParseException

Returns a new instance of AmbigousParseException.



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# File 'lib/rpdf2txt-rockit/parsing_ambiguities.rb', line 17

def initialize(stringBeingParsed, fullTree, *alternativeTrees)
  super("Ambigous parse")
  @alternatives, @full_tree = alternativeTrees, fullTree
  init_substring(stringBeingParsed)
end

Instance Attribute Details

#alternatives ⇒ Object (readonly)

Returns the value of attribute alternatives.



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# File 'lib/rpdf2txt-rockit/parsing_ambiguities.rb', line 15

def alternatives
  @alternatives
end

#substring ⇒ Object (readonly)

Returns the value of attribute substring.



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# File 'lib/rpdf2txt-rockit/parsing_ambiguities.rb', line 15

def substring
  @substring
end

Instance Method Details

#difference_description(i, j, str0, o1, o2, childPath = "") ⇒ Object 



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# File 'lib/rpdf2txt-rockit/parsing_ambiguities.rb', line 47

def difference_description(i, j, str0, o1, o2, childPath = "")
  child_str = 
    childPath.length > 0 ? "in the childrens '#{childPath[1..-1]}'" : ""
  " Alternatives #{i+1} and #{j+1} differ #{child_str} by not having" +
    " the same #{str0} (#{o1.inspect} and #{o2.inspect})"
end

#inspect(prettyPrinter = nil) ⇒ Object 



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# File 'lib/rpdf2txt-rockit/parsing_ambiguities.rb', line 23

def inspect(prettyPrinter = nil)
  str = "Ambiguity: The substring '#{substring}' can be parsed as:\n"
  #return str + report_on_tree_differences(alternatives[0], alternatives[1], 0, 1)
  strings_to_show, same_strings = Array.new, Array.new
  alternatives.each_with_index {|alt, i|
    s = prettyPrinter ? prettyPrinter.print(alt) : alt.inspect
    if (j = strings_to_show.index(s))
  same_strings.push [j,i]
    end
    strings_to_show.push s
  }
  alternatives.each_with_index do |alt,i| 
    str << " Alternative #{i+1}: #{strings_to_show[i]}"
    str << ", or" if i < alternatives.length-1
    str << "\n"
  end
  same_strings.each do |i,j| 
    str += report_on_tree_differences(alternatives[i], alternatives[j],
      i, j)
  end
  @full_tree.compact!
  str + "The full tree looks like:\n" + @full_tree.inspect
end

#report_on_tree_differences(t1, t2, i, j, childPath = "") ⇒ Object 



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# File 'lib/rpdf2txt-rockit/parsing_ambiguities.rb', line 54

def report_on_tree_differences(t1, t2, i, j, childPath = "")
  if t1.class != t2.class
    difference_description(i, j, "type", t1.class, t2.class, childPath)
  elsif not t1.kind_of?(SyntaxTree)
    if t1 != t2
  " Alternatives #{i} and #{j} are not SyntaxTree's and differ"
    else
  ""
    end
  elsif t1.name != t2.name
    difference_description(i, j, "name", t1.name, t2.name, childPath)
  elsif t1.children_names != t2.children_names
    difference_description(i, j, "children_names",t1.children_names,
       t2.children_names, childPath)
  else
    t1.childrens.each_with_index do |child, k|
  report = report_on_tree_differences(child, t2[k], i, j,
          childPath + "." + 
          t1.children_names[k])
  return report if report.length > 0
    end
    return ""
  end
end