C++ (Cpp) rasqal_literal_is_numeric示例

示例#1

文件： rasqal_expr_numerics.c 项目： xoration/rasqal

/* 
 * rasqal_expression_evaluate_abs:
 * @e: The expression to evaluate.
 * @eval_context: Evaluation context
 *
 * INTERNAL - Evaluate SPARQL 1.1 RASQAL_EXPR_ABS (numeric) expression.
 *
 * Return value: A #rasqal_literal value or NULL on failure.
 */
rasqal_literal*
rasqal_expression_evaluate_abs(rasqal_expression *e,
                               rasqal_evaluation_context *eval_context,
                               int *error_p)
{
  rasqal_literal* l1;
  rasqal_literal* result = NULL;

  l1 = rasqal_expression_evaluate2(e->arg1, eval_context, error_p);
  if(*error_p || !l1)
    goto failed;
  
  if(!rasqal_literal_is_numeric(l1))
    goto failed;

  result = rasqal_literal_abs(l1, error_p);
  rasqal_free_literal(l1);
  l1 = NULL;
  
  if(*error_p)
    goto failed;

  return result;

  failed:
  if(error_p)
    *error_p = 1;
  
  if(l1)
    rasqal_free_literal(l1);

  return NULL;
}

示例#2

文件： rasqal_expr_evaluate.c 项目： sengels/rasqal

/* 
 * rasqal_expression_evaluate_istype:
 * @e: The expression to evaluate.
 * @eval_context: Evaluation context
 *
 * INTERNAL - Evaluate RASQAL_EXPR_ISBLANK, RASQAL_EXPR_ISURI,
 * RASQAL_EXPR_ISLITERAL and RASQAL_EXPR_ISNUMERIC (expr)
 * expressions.
 *
 * Return value: A #rasqal_literal boolean value or NULL on failure.
 */
static rasqal_literal*
rasqal_expression_evaluate_istype(rasqal_expression *e,
                                  rasqal_evaluation_context *eval_context,
                                  int *error_p)
{
  rasqal_world* world = eval_context->world;
  rasqal_literal* l1;
  int free_literal = 1;
  rasqal_variable *v;
  int b;
  
  l1 = rasqal_expression_evaluate2(e->arg1, eval_context, error_p);
  if(*error_p || !l1)
    goto failed;

  v = rasqal_literal_as_variable(l1);
  if(v) {
    rasqal_free_literal(l1);

    l1 = v->value; /* don't need v after this */

    free_literal = 0;
    if(!l1)
      goto failed;
  }
  
  if(e->op == RASQAL_EXPR_ISBLANK)
    b = (l1->type == RASQAL_LITERAL_BLANK);
  else if(e->op == RASQAL_EXPR_ISLITERAL)
    b = (rasqal_literal_get_rdf_term_type(l1) == RASQAL_LITERAL_STRING);
  else if(e->op == RASQAL_EXPR_ISURI)
    b =(l1->type == RASQAL_LITERAL_URI);
  else
    b = (rasqal_literal_is_numeric(l1));
  
  if(free_literal)
    rasqal_free_literal(l1);
  
  return rasqal_new_boolean_literal(world, b);

failed:
  if(error_p)
    *error_p = 1;
  
  if(free_literal && l1)
    rasqal_free_literal(l1);

  return NULL;
}