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Parser::LikeExpr Class Reference

#include <ParserNode.h>

+ Inheritance diagram for Parser::LikeExpr:
+ Collaboration diagram for Parser::LikeExpr:

Public Member Functions

 LikeExpr (bool n, bool i, Expr *a, Expr *l, Expr *e)
 
bool get_is_not () const
 
const Exprget_arg () const
 
const Exprget_like_string () const
 
const Exprget_escape_string () const
 
std::shared_ptr< Analyzer::Expranalyze (const Catalog_Namespace::Catalog &catalog, Analyzer::Query &query, TlistRefType allow_tlist_ref=TLIST_NONE) const override
 
std::string to_string () const override
 
- Public Member Functions inherited from Parser::Node
virtual ~Node ()
 

Static Public Member Functions

static std::shared_ptr
< Analyzer::Expr
get (std::shared_ptr< Analyzer::Expr > arg_expr, std::shared_ptr< Analyzer::Expr > like_expr, std::shared_ptr< Analyzer::Expr > escape_expr, const bool is_ilike, const bool is_not)
 

Static Private Member Functions

static void check_like_expr (const std::string &like_str, char escape_char)
 
static bool test_is_simple_expr (const std::string &like_str, char escape_char)
 
static void erase_cntl_chars (std::string &like_str, char escape_char)
 

Private Attributes

bool is_not
 
bool is_ilike
 
std::unique_ptr< Exprarg
 
std::unique_ptr< Exprlike_string
 
std::unique_ptr< Exprescape_string
 

Additional Inherited Members

- Public Types inherited from Parser::Expr
enum  TlistRefType { TLIST_NONE, TLIST_REF, TLIST_COPY }
 

Detailed Description

Definition at line 486 of file ParserNode.h.

Constructor & Destructor Documentation

Parser::LikeExpr::LikeExpr ( bool  n,
bool  i,
Expr a,
Expr l,
Expr e 
)
inline

Definition at line 488 of file ParserNode.h.

489  : is_not(n), is_ilike(i), arg(a), like_string(l), escape_string(e) {}
std::unique_ptr< Expr > escape_string
Definition: ParserNode.h:510
std::unique_ptr< Expr > like_string
Definition: ParserNode.h:509
std::unique_ptr< Expr > arg
Definition: ParserNode.h:508

Member Function Documentation

std::shared_ptr< Analyzer::Expr > Parser::LikeExpr::analyze ( const Catalog_Namespace::Catalog catalog,
Analyzer::Query query,
TlistRefType  allow_tlist_ref = TLIST_NONE 
) const
overridevirtual

Implements Parser::Expr.

Definition at line 535 of file ParserNode.cpp.

538  {
539  auto arg_expr = arg->analyze(catalog, query, allow_tlist_ref);
540  auto like_expr = like_string->analyze(catalog, query, allow_tlist_ref);
541  auto escape_expr = escape_string == nullptr
542  ? nullptr
543  : escape_string->analyze(catalog, query, allow_tlist_ref);
544  return LikeExpr::get(arg_expr, like_expr, escape_expr, is_ilike, is_not);
545 }
std::unique_ptr< Expr > escape_string
Definition: ParserNode.h:510
static std::shared_ptr< Analyzer::Expr > get(std::shared_ptr< Analyzer::Expr > arg_expr, std::shared_ptr< Analyzer::Expr > like_expr, std::shared_ptr< Analyzer::Expr > escape_expr, const bool is_ilike, const bool is_not)
Definition: ParserNode.cpp:547
std::unique_ptr< Expr > like_string
Definition: ParserNode.h:509
std::unique_ptr< Expr > arg
Definition: ParserNode.h:508
void Parser::LikeExpr::check_like_expr ( const std::string &  like_str,
char  escape_char 
)
staticprivate

Definition at line 489 of file ParserNode.cpp.

489  {
490  if (like_str.back() == escape_char) {
491  throw std::runtime_error("LIKE pattern must not end with escape character.");
492  }
493 }
void Parser::LikeExpr::erase_cntl_chars ( std::string &  like_str,
char  escape_char 
)
staticprivate

Definition at line 516 of file ParserNode.cpp.

516  {
517  char prev_char = '\0';
518  // easier to create new string of allowable chars
519  // rather than erase chars from
520  // existing string
521  std::string new_str;
522  for (char& cur_char : like_str) {
523  if (cur_char == '%' || cur_char == escape_char) {
524  if (prev_char != escape_char) {
525  prev_char = cur_char;
526  continue;
527  }
528  }
529  new_str.push_back(cur_char);
530  prev_char = cur_char;
531  }
532  like_str = new_str;
533 }
std::shared_ptr< Analyzer::Expr > Parser::LikeExpr::get ( std::shared_ptr< Analyzer::Expr arg_expr,
std::shared_ptr< Analyzer::Expr like_expr,
std::shared_ptr< Analyzer::Expr escape_expr,
const bool  is_ilike,
const bool  is_not 
)
static

Definition at line 547 of file ParserNode.cpp.

References Analyzer::Constant::get_constval(), kBOOLEAN, kNOT, run_benchmark_import::result, and Datum::stringval.

Referenced by RelAlgTranslator::translateLike().

551  {
552  if (!arg_expr->get_type_info().is_string()) {
553  throw std::runtime_error("expression before LIKE must be of a string type.");
554  }
555  if (!like_expr->get_type_info().is_string()) {
556  throw std::runtime_error("expression after LIKE must be of a string type.");
557  }
558  char escape_char = '\\';
559  if (escape_expr != nullptr) {
560  if (!escape_expr->get_type_info().is_string()) {
561  throw std::runtime_error("expression after ESCAPE must be of a string type.");
562  }
563  if (!escape_expr->get_type_info().is_string()) {
564  throw std::runtime_error("expression after ESCAPE must be of a string type.");
565  }
566  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(escape_expr);
567  if (c != nullptr && c->get_constval().stringval->length() > 1) {
568  throw std::runtime_error("String after ESCAPE must have a single character.");
569  }
570  escape_char = (*c->get_constval().stringval)[0];
571  }
572  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(like_expr);
573  bool is_simple = false;
574  if (c != nullptr) {
575  std::string& pattern = *c->get_constval().stringval;
576  if (is_ilike) {
577  std::transform(pattern.begin(), pattern.end(), pattern.begin(), ::tolower);
578  }
579  check_like_expr(pattern, escape_char);
580  is_simple = test_is_simple_expr(pattern, escape_char);
581  if (is_simple) {
582  erase_cntl_chars(pattern, escape_char);
583  }
584  }
585  std::shared_ptr<Analyzer::Expr> result = makeExpr<Analyzer::LikeExpr>(
586  arg_expr->decompress(), like_expr, escape_expr, is_ilike, is_simple);
587  if (is_not) {
588  result = makeExpr<Analyzer::UOper>(kBOOLEAN, kNOT, result);
589  }
590  return result;
591 }
static void erase_cntl_chars(std::string &like_str, char escape_char)
Definition: ParserNode.cpp:516
std::string * stringval
Definition: sqltypes.h:142
Datum get_constval() const
Definition: Analyzer.h:336
static bool test_is_simple_expr(const std::string &like_str, char escape_char)
Definition: ParserNode.cpp:495
Definition: sqldefs.h:39
static void check_like_expr(const std::string &like_str, char escape_char)
Definition: ParserNode.cpp:489

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const Expr* Parser::LikeExpr::get_arg ( ) const
inline

Definition at line 491 of file ParserNode.h.

References arg.

491 { return arg.get(); }
std::unique_ptr< Expr > arg
Definition: ParserNode.h:508
const Expr* Parser::LikeExpr::get_escape_string ( ) const
inline

Definition at line 493 of file ParserNode.h.

References escape_string.

493 { return escape_string.get(); }
std::unique_ptr< Expr > escape_string
Definition: ParserNode.h:510
bool Parser::LikeExpr::get_is_not ( ) const
inline

Definition at line 490 of file ParserNode.h.

References is_not.

490 { return is_not; }
const Expr* Parser::LikeExpr::get_like_string ( ) const
inline

Definition at line 492 of file ParserNode.h.

References like_string.

492 { return like_string.get(); }
std::unique_ptr< Expr > like_string
Definition: ParserNode.h:509
bool Parser::LikeExpr::test_is_simple_expr ( const std::string &  like_str,
char  escape_char 
)
staticprivate

Definition at line 495 of file ParserNode.cpp.

495  {
496  // if not bounded by '%' then not a simple string
497  if (like_str.size() < 2 || like_str[0] != '%' || like_str[like_str.size() - 1] != '%') {
498  return false;
499  }
500  // if the last '%' is escaped then not a simple string
501  if (like_str[like_str.size() - 2] == escape_char &&
502  like_str[like_str.size() - 3] != escape_char) {
503  return false;
504  }
505  for (size_t i = 1; i < like_str.size() - 1; i++) {
506  if (like_str[i] == '%' || like_str[i] == '_' || like_str[i] == '[' ||
507  like_str[i] == ']') {
508  if (like_str[i - 1] != escape_char) {
509  return false;
510  }
511  }
512  }
513  return true;
514 }
std::string Parser::LikeExpr::to_string ( ) const
overridevirtual

Implements Parser::Expr.

Definition at line 1386 of file ParserNode.cpp.

1386  {
1387  std::string str = arg->to_string();
1388  if (is_not) {
1389  str += " NOT LIKE ";
1390  } else {
1391  str += " LIKE ";
1392  }
1393  str += like_string->to_string();
1394  if (escape_string != nullptr) {
1395  str += " ESCAPE " + escape_string->to_string();
1396  }
1397  return str;
1398 }
std::unique_ptr< Expr > escape_string
Definition: ParserNode.h:510
std::unique_ptr< Expr > like_string
Definition: ParserNode.h:509
std::unique_ptr< Expr > arg
Definition: ParserNode.h:508

Member Data Documentation

std::unique_ptr<Expr> Parser::LikeExpr::arg
private

Definition at line 508 of file ParserNode.h.

Referenced by get_arg().

std::unique_ptr<Expr> Parser::LikeExpr::escape_string
private

Definition at line 510 of file ParserNode.h.

Referenced by get_escape_string().

bool Parser::LikeExpr::is_ilike
private

Definition at line 507 of file ParserNode.h.

bool Parser::LikeExpr::is_not
private

Definition at line 506 of file ParserNode.h.

Referenced by get_is_not().

std::unique_ptr<Expr> Parser::LikeExpr::like_string
private

Definition at line 509 of file ParserNode.h.

Referenced by get_like_string().


The documentation for this class was generated from the following files: