Method: AND#evalPrecedence

Defined in:

lib/antlr4/atn/SemanticContext.rb

#evalPrecedence(parser, outerContext) ⇒ Object

# File 'lib/antlr4/atn/SemanticContext.rb', line 223

def evalPrecedence(parser, outerContext)
    differs = false
    operands = Array.new
    self.opnds.each {|context|
        evaluated = context.evalPrecedence(parser, outerContext)
        if evaluated.equal? context then
            differs = false
        else
            differs = true
        end
#            differs = differs || (! (evaluated.equal? context))
        # The AND context is false if any element is false
        return nil if evaluated.nil? 
        if evaluated.equal? SemanticContext.NONE
            # Reduce the result by skipping true elements
            operands.push(evaluated)
        end
    }
    if not differs
        return self
    end

    if operands.length()==0
        # all elements were true, so the AND context is true
        return SemanticContext.NONE
    end

    result = nil
    operands.each {|o| 
        if result.nil? 
            result = o 
        else 
          result = result.andContext(o)
        end
    }
    return result
end