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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 490 of file ParserNode.h.

Constructor & Destructor Documentation

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

Definition at line 492 of file ParserNode.h.

std::unique_ptr< Expr > arg_
Definition: ParserNode.h:512
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:514
constexpr double a
Definition: Utm.h:33
std::unique_ptr< Expr > like_string_
Definition: ParserNode.h:513
constexpr double n
Definition: Utm.h:39

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 554 of file ParserNode.cpp.

557  {
558  auto arg_expr = arg_->analyze(catalog, query, allow_tlist_ref);
559  auto like_expr = like_string_->analyze(catalog, query, allow_tlist_ref);
560  auto escape_expr = escape_string_ == nullptr
561  ? nullptr
562  : escape_string_->analyze(catalog, query, allow_tlist_ref);
563  return LikeExpr::get(arg_expr, like_expr, escape_expr, is_ilike_, is_not_);
564 }
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:512
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:514
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:566
std::unique_ptr< Expr > like_string_
Definition: ParserNode.h:513
void Parser::LikeExpr::check_like_expr ( const std::string &  like_str,
char  escape_char 
)
staticprivate

Definition at line 508 of file ParserNode.cpp.

508  {
509  if (like_str.back() == escape_char) {
510  throw std::runtime_error("LIKE pattern must not end with escape character.");
511  }
512 }
void Parser::LikeExpr::erase_cntl_chars ( std::string &  like_str,
char  escape_char 
)
staticprivate

Definition at line 535 of file ParserNode.cpp.

535  {
536  char prev_char = '\0';
537  // easier to create new string of allowable chars
538  // rather than erase chars from
539  // existing string
540  std::string new_str;
541  for (char& cur_char : like_str) {
542  if (cur_char == '%' || cur_char == escape_char) {
543  if (prev_char != escape_char) {
544  prev_char = cur_char;
545  continue;
546  }
547  }
548  new_str.push_back(cur_char);
549  prev_char = cur_char;
550  }
551  like_str = new_str;
552 }
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 566 of file ParserNode.cpp.

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

Referenced by RelAlgTranslator::translateLike().

570  {
571  if (!arg_expr->get_type_info().is_string()) {
572  throw std::runtime_error("expression before LIKE must be of a string type.");
573  }
574  if (!like_expr->get_type_info().is_string()) {
575  throw std::runtime_error("expression after LIKE must be of a string type.");
576  }
577  char escape_char = '\\';
578  if (escape_expr != nullptr) {
579  if (!escape_expr->get_type_info().is_string()) {
580  throw std::runtime_error("expression after ESCAPE must be of a string type.");
581  }
582  if (!escape_expr->get_type_info().is_string()) {
583  throw std::runtime_error("expression after ESCAPE must be of a string type.");
584  }
585  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(escape_expr);
586  if (c != nullptr && c->get_constval().stringval->length() > 1) {
587  throw std::runtime_error("String after ESCAPE must have a single character.");
588  }
589  escape_char = (*c->get_constval().stringval)[0];
590  }
591  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(like_expr);
592  bool is_simple = false;
593  if (c != nullptr) {
594  std::string& pattern = *c->get_constval().stringval;
595  if (is_ilike) {
596  std::transform(pattern.begin(), pattern.end(), pattern.begin(), ::tolower);
597  }
598  check_like_expr(pattern, escape_char);
599  is_simple = test_is_simple_expr(pattern, escape_char);
600  if (is_simple) {
601  erase_cntl_chars(pattern, escape_char);
602  }
603  }
604  std::shared_ptr<Analyzer::Expr> result = makeExpr<Analyzer::LikeExpr>(
605  arg_expr->decompress(), like_expr, escape_expr, is_ilike, is_simple);
606  if (is_not) {
607  result = makeExpr<Analyzer::UOper>(kBOOLEAN, kNOT, result);
608  }
609  return result;
610 }
OUTPUT transform(INPUT const &input, FUNC const &func)
Definition: misc.h:288
static void erase_cntl_chars(std::string &like_str, char escape_char)
Definition: ParserNode.cpp:535
std::string * stringval
Definition: sqltypes.h:220
Datum get_constval() const
Definition: Analyzer.h:334
static bool test_is_simple_expr(const std::string &like_str, char escape_char)
Definition: ParserNode.cpp:514
Definition: sqldefs.h:39
static void check_like_expr(const std::string &like_str, char escape_char)
Definition: ParserNode.cpp:508

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

Definition at line 495 of file ParserNode.h.

References arg_.

495 { return arg_.get(); }
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:512
const Expr* Parser::LikeExpr::get_escape_string ( ) const
inline

Definition at line 497 of file ParserNode.h.

References escape_string_.

497 { return escape_string_.get(); }
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:514
bool Parser::LikeExpr::get_is_not ( ) const
inline

Definition at line 494 of file ParserNode.h.

References is_not_.

494 { return is_not_; }
const Expr* Parser::LikeExpr::get_like_string ( ) const
inline

Definition at line 496 of file ParserNode.h.

References like_string_.

496 { return like_string_.get(); }
std::unique_ptr< Expr > like_string_
Definition: ParserNode.h:513
bool Parser::LikeExpr::test_is_simple_expr ( const std::string &  like_str,
char  escape_char 
)
staticprivate

Definition at line 514 of file ParserNode.cpp.

References i.

514  {
515  // if not bounded by '%' then not a simple string
516  if (like_str.size() < 2 || like_str[0] != '%' || like_str[like_str.size() - 1] != '%') {
517  return false;
518  }
519  // if the last '%' is escaped then not a simple string
520  if (like_str[like_str.size() - 2] == escape_char &&
521  like_str[like_str.size() - 3] != escape_char) {
522  return false;
523  }
524  for (size_t i = 1; i < like_str.size() - 1; i++) {
525  if (like_str[i] == '%' || like_str[i] == '_' || like_str[i] == '[' ||
526  like_str[i] == ']') {
527  if (like_str[i - 1] != escape_char) {
528  return false;
529  }
530  }
531  }
532  return true;
533 }
std::string Parser::LikeExpr::to_string ( ) const
overridevirtual

Implements Parser::Expr.

Definition at line 1533 of file ParserNode.cpp.

1533  {
1534  std::string str = arg_->to_string();
1535  if (is_not_) {
1536  str += " NOT LIKE ";
1537  } else {
1538  str += " LIKE ";
1539  }
1540  str += like_string_->to_string();
1541  if (escape_string_ != nullptr) {
1542  str += " ESCAPE " + escape_string_->to_string();
1543  }
1544  return str;
1545 }
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:512
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:514
std::unique_ptr< Expr > like_string_
Definition: ParserNode.h:513

Member Data Documentation

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

Definition at line 512 of file ParserNode.h.

Referenced by get_arg().

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

Definition at line 514 of file ParserNode.h.

Referenced by get_escape_string().

bool Parser::LikeExpr::is_ilike_
private

Definition at line 511 of file ParserNode.h.

bool Parser::LikeExpr::is_not_
private

Definition at line 510 of file ParserNode.h.

Referenced by get_is_not().

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

Definition at line 513 of file ParserNode.h.

Referenced by get_like_string().


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