Class: Fabulator::Expr::PathExpr

Inherits:
Object
  • Object
show all
Defined in:
lib/fabulator/expr/path_expr.rb

Instance Method Summary collapse

Constructor Details

#initialize(pe, predicates, segment) ⇒ PathExpr

Returns a new instance of PathExpr.



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# File 'lib/fabulator/expr/path_expr.rb', line 4

def initialize(pe, predicates, segment)
  @primary_expr = pe
  @predicates = Fabulator::Expr::Predicates.new(nil, predicates)
  @segment = (segment.is_a?(Array) ? segment : [ segment ]) - [nil]
end

Instance Method Details

#expr_type(context) ⇒ Object 



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# File 'lib/fabulator/expr/path_expr.rb', line 10

def expr_type(context)
  nil
end

#run(context, autovivify = false) ⇒ Object 



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# File 'lib/fabulator/expr/path_expr.rb', line 14

def run(context, autovivify = false)
  if @primary_expr.nil?
    possible = [ context.root ]
  else
    possible = @primary_expr.run(context,autovivify).uniq
  end

  final = [ ]

  @segment = [ @segment ] unless @segment.is_a?(Array)

  possible.each do |e|
    next if e.nil?
    pos = @predicates.run(context.with_root(e), autovivify)
    next if pos.empty?
    @segment.each do |s|
      pos = pos.collect{ |p| 
        s.run(context.with_root(p), autovivify) 
      }.flatten - [ nil ]
    end
      
    final = final + pos
  end

  return final
end