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Parser::RegexpExpr Class Reference

#include <ParserNode.h>

+ Inheritance diagram for Parser::RegexpExpr:
+ Collaboration diagram for Parser::RegexpExpr:

Public Member Functions

 RegexpExpr (bool n, Expr *a, Expr *p, Expr *e)
 
bool get_is_not () const
 
const Exprget_arg () const
 
const Exprget_pattern_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 > pattern_expr, std::shared_ptr< Analyzer::Expr > escape_expr, const bool is_not)
 

Static Private Member Functions

static void check_pattern_expr (const std::string &pattern_str, char escape_char)
 
static bool translate_to_like_pattern (std::string &pattern_str, char escape_char)
 

Private Attributes

bool is_not_
 
std::unique_ptr< Exprarg_
 
std::unique_ptr< Exprpattern_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 527 of file ParserNode.h.

Constructor & Destructor Documentation

Parser::RegexpExpr::RegexpExpr ( bool  n,
Expr a,
Expr p,
Expr e 
)
inline

Definition at line 529 of file ParserNode.h.

530  : is_not_(n), arg_(a), pattern_string_(p), escape_string_(e) {}
constexpr double a
Definition: Utm.h:32
std::unique_ptr< Expr > pattern_string_
Definition: ParserNode.h:548
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:547
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:549
constexpr double n
Definition: Utm.h:38

Member Function Documentation

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

Implements Parser::Expr.

Definition at line 783 of file ParserNode.cpp.

786  {
787  auto arg_expr = arg_->analyze(catalog, query, allow_tlist_ref);
788  auto pattern_expr = pattern_string_->analyze(catalog, query, allow_tlist_ref);
789  auto escape_expr = escape_string_ == nullptr
790  ? nullptr
791  : escape_string_->analyze(catalog, query, allow_tlist_ref);
792  return RegexpExpr::get(arg_expr, pattern_expr, escape_expr, is_not_);
793 }
static std::shared_ptr< Analyzer::Expr > get(std::shared_ptr< Analyzer::Expr > arg_expr, std::shared_ptr< Analyzer::Expr > pattern_expr, std::shared_ptr< Analyzer::Expr > escape_expr, const bool is_not)
Definition: ParserNode.cpp:795
std::unique_ptr< Expr > pattern_string_
Definition: ParserNode.h:548
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:547
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:549
void Parser::RegexpExpr::check_pattern_expr ( const std::string &  pattern_str,
char  escape_char 
)
staticprivate

Definition at line 746 of file ParserNode.cpp.

746  {
747  if (pattern_str.back() == escape_char) {
748  throw std::runtime_error("REGEXP pattern must not end with escape character.");
749  }
750 }
std::shared_ptr< Analyzer::Expr > Parser::RegexpExpr::get ( std::shared_ptr< Analyzer::Expr arg_expr,
std::shared_ptr< Analyzer::Expr pattern_expr,
std::shared_ptr< Analyzer::Expr escape_expr,
const bool  is_not 
)
static

Definition at line 795 of file ParserNode.cpp.

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

Referenced by RelAlgTranslator::translateRegexp().

799  {
800  if (!arg_expr->get_type_info().is_string()) {
801  throw std::runtime_error("expression before REGEXP must be of a string type.");
802  }
803  if (!pattern_expr->get_type_info().is_string()) {
804  throw std::runtime_error("expression after REGEXP must be of a string type.");
805  }
806  char escape_char = '\\';
807  if (escape_expr != nullptr) {
808  if (!escape_expr->get_type_info().is_string()) {
809  throw std::runtime_error("expression after ESCAPE must be of a string type.");
810  }
811  if (!escape_expr->get_type_info().is_string()) {
812  throw std::runtime_error("expression after ESCAPE must be of a string type.");
813  }
814  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(escape_expr);
815  if (c != nullptr && c->get_constval().stringval->length() > 1) {
816  throw std::runtime_error("String after ESCAPE must have a single character.");
817  }
818  escape_char = (*c->get_constval().stringval)[0];
819  if (escape_char != '\\') {
820  throw std::runtime_error("Only supporting '\\' escape character.");
821  }
822  }
823  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(pattern_expr);
824  if (c != nullptr) {
825  std::string& pattern = *c->get_constval().stringval;
826  if (translate_to_like_pattern(pattern, escape_char)) {
827  return LikeExpr::get(arg_expr, pattern_expr, escape_expr, false, is_not);
828  }
829  }
830  std::shared_ptr<Analyzer::Expr> result =
831  makeExpr<Analyzer::RegexpExpr>(arg_expr->decompress(), pattern_expr, escape_expr);
832  if (is_not) {
833  result = makeExpr<Analyzer::UOper>(kBOOLEAN, kNOT, result);
834  }
835  return result;
836 }
static bool translate_to_like_pattern(std::string &pattern_str, char escape_char)
Definition: ParserNode.cpp:752
std::string * stringval
Definition: Datum.h:79
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:700
Datum get_constval() const
Definition: Analyzer.h:348
Definition: sqldefs.h:38

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

Definition at line 532 of file ParserNode.h.

References arg_.

532 { return arg_.get(); }
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:547
const Expr* Parser::RegexpExpr::get_escape_string ( ) const
inline

Definition at line 534 of file ParserNode.h.

References escape_string_.

534 { return escape_string_.get(); }
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:549
bool Parser::RegexpExpr::get_is_not ( ) const
inline

Definition at line 531 of file ParserNode.h.

References is_not_.

531 { return is_not_; }
const Expr* Parser::RegexpExpr::get_pattern_string ( ) const
inline

Definition at line 533 of file ParserNode.h.

References pattern_string_.

533 { return pattern_string_.get(); }
std::unique_ptr< Expr > pattern_string_
Definition: ParserNode.h:548
std::string Parser::RegexpExpr::to_string ( ) const
overridevirtual

Implements Parser::Expr.

Definition at line 2258 of file ParserNode.cpp.

2258  {
2259  std::string str = arg_->to_string();
2260  if (is_not_) {
2261  str += " NOT REGEXP ";
2262  } else {
2263  str += " REGEXP ";
2264  }
2265  str += pattern_string_->to_string();
2266  if (escape_string_ != nullptr) {
2267  str += " ESCAPE " + escape_string_->to_string();
2268  }
2269  return str;
2270 }
std::unique_ptr< Expr > pattern_string_
Definition: ParserNode.h:548
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:547
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:549
bool Parser::RegexpExpr::translate_to_like_pattern ( std::string &  pattern_str,
char  escape_char 
)
staticprivate

Definition at line 752 of file ParserNode.cpp.

752  {
753  char prev_char = '\0';
754  char prev_prev_char = '\0';
755  std::string like_str;
756  for (char& cur_char : pattern_str) {
757  if (prev_char == escape_char || isalnum(cur_char) || cur_char == ' ' ||
758  cur_char == '.') {
759  like_str.push_back((cur_char == '.') ? '_' : cur_char);
760  prev_prev_char = prev_char;
761  prev_char = cur_char;
762  continue;
763  }
764  if (prev_char == '.' && prev_prev_char != escape_char) {
765  if (cur_char == '*' || cur_char == '+') {
766  if (cur_char == '*') {
767  like_str.pop_back();
768  }
769  // .* --> %
770  // .+ --> _%
771  like_str.push_back('%');
772  prev_prev_char = prev_char;
773  prev_char = cur_char;
774  continue;
775  }
776  }
777  return false;
778  }
779  pattern_str = like_str;
780  return true;
781 }

Member Data Documentation

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

Definition at line 547 of file ParserNode.h.

Referenced by get_arg().

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

Definition at line 549 of file ParserNode.h.

Referenced by get_escape_string().

bool Parser::RegexpExpr::is_not_
private

Definition at line 546 of file ParserNode.h.

Referenced by get_is_not().

std::unique_ptr<Expr> Parser::RegexpExpr::pattern_string_
private

Definition at line 548 of file ParserNode.h.

Referenced by get_pattern_string().


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