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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 525 of file ParserNode.h.

Constructor & Destructor Documentation

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

Definition at line 527 of file ParserNode.h.

528  : is_not_(n), arg_(a), pattern_string_(p), escape_string_(e) {}
constexpr double a
Definition: Utm.h:33
std::unique_ptr< Expr > pattern_string_
Definition: ParserNode.h:546
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:545
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:547
constexpr double n
Definition: Utm.h:39

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 649 of file ParserNode.cpp.

652  {
653  auto arg_expr = arg_->analyze(catalog, query, allow_tlist_ref);
654  auto pattern_expr = pattern_string_->analyze(catalog, query, allow_tlist_ref);
655  auto escape_expr = escape_string_ == nullptr
656  ? nullptr
657  : escape_string_->analyze(catalog, query, allow_tlist_ref);
658  return RegexpExpr::get(arg_expr, pattern_expr, escape_expr, is_not_);
659 }
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:661
std::unique_ptr< Expr > pattern_string_
Definition: ParserNode.h:546
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:545
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:547
void Parser::RegexpExpr::check_pattern_expr ( const std::string &  pattern_str,
char  escape_char 
)
staticprivate

Definition at line 612 of file ParserNode.cpp.

612  {
613  if (pattern_str.back() == escape_char) {
614  throw std::runtime_error("REGEXP pattern must not end with escape character.");
615  }
616 }
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 661 of file ParserNode.cpp.

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

Referenced by RelAlgTranslator::translateRegexp().

665  {
666  if (!arg_expr->get_type_info().is_string()) {
667  throw std::runtime_error("expression before REGEXP must be of a string type.");
668  }
669  if (!pattern_expr->get_type_info().is_string()) {
670  throw std::runtime_error("expression after REGEXP must be of a string type.");
671  }
672  char escape_char = '\\';
673  if (escape_expr != nullptr) {
674  if (!escape_expr->get_type_info().is_string()) {
675  throw std::runtime_error("expression after ESCAPE must be of a string type.");
676  }
677  if (!escape_expr->get_type_info().is_string()) {
678  throw std::runtime_error("expression after ESCAPE must be of a string type.");
679  }
680  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(escape_expr);
681  if (c != nullptr && c->get_constval().stringval->length() > 1) {
682  throw std::runtime_error("String after ESCAPE must have a single character.");
683  }
684  escape_char = (*c->get_constval().stringval)[0];
685  if (escape_char != '\\') {
686  throw std::runtime_error("Only supporting '\\' escape character.");
687  }
688  }
689  auto c = std::dynamic_pointer_cast<Analyzer::Constant>(pattern_expr);
690  if (c != nullptr) {
691  std::string& pattern = *c->get_constval().stringval;
692  if (translate_to_like_pattern(pattern, escape_char)) {
693  return LikeExpr::get(arg_expr, pattern_expr, escape_expr, false, is_not);
694  }
695  }
696  std::shared_ptr<Analyzer::Expr> result =
697  makeExpr<Analyzer::RegexpExpr>(arg_expr->decompress(), pattern_expr, escape_expr);
698  if (is_not) {
699  result = makeExpr<Analyzer::UOper>(kBOOLEAN, kNOT, result);
700  }
701  return result;
702 }
static bool translate_to_like_pattern(std::string &pattern_str, char escape_char)
Definition: ParserNode.cpp:618
std::string * stringval
Definition: sqltypes.h:220
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
Datum get_constval() const
Definition: Analyzer.h:334
Definition: sqldefs.h:39

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

Definition at line 530 of file ParserNode.h.

References arg_.

530 { return arg_.get(); }
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:545
const Expr* Parser::RegexpExpr::get_escape_string ( ) const
inline

Definition at line 532 of file ParserNode.h.

References escape_string_.

532 { return escape_string_.get(); }
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:547
bool Parser::RegexpExpr::get_is_not ( ) const
inline

Definition at line 529 of file ParserNode.h.

References is_not_.

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

Definition at line 531 of file ParserNode.h.

References pattern_string_.

531 { return pattern_string_.get(); }
std::unique_ptr< Expr > pattern_string_
Definition: ParserNode.h:546
std::string Parser::RegexpExpr::to_string ( ) const
overridevirtual

Implements Parser::Expr.

Definition at line 1547 of file ParserNode.cpp.

1547  {
1548  std::string str = arg_->to_string();
1549  if (is_not_) {
1550  str += " NOT REGEXP ";
1551  } else {
1552  str += " REGEXP ";
1553  }
1554  str += pattern_string_->to_string();
1555  if (escape_string_ != nullptr) {
1556  str += " ESCAPE " + escape_string_->to_string();
1557  }
1558  return str;
1559 }
std::unique_ptr< Expr > pattern_string_
Definition: ParserNode.h:546
std::unique_ptr< Expr > arg_
Definition: ParserNode.h:545
std::unique_ptr< Expr > escape_string_
Definition: ParserNode.h:547
bool Parser::RegexpExpr::translate_to_like_pattern ( std::string &  pattern_str,
char  escape_char 
)
staticprivate

Definition at line 618 of file ParserNode.cpp.

618  {
619  char prev_char = '\0';
620  char prev_prev_char = '\0';
621  std::string like_str;
622  for (char& cur_char : pattern_str) {
623  if (prev_char == escape_char || isalnum(cur_char) || cur_char == ' ' ||
624  cur_char == '.') {
625  like_str.push_back((cur_char == '.') ? '_' : cur_char);
626  prev_prev_char = prev_char;
627  prev_char = cur_char;
628  continue;
629  }
630  if (prev_char == '.' && prev_prev_char != escape_char) {
631  if (cur_char == '*' || cur_char == '+') {
632  if (cur_char == '*') {
633  like_str.pop_back();
634  }
635  // .* --> %
636  // .+ --> _%
637  like_str.push_back('%');
638  prev_prev_char = prev_char;
639  prev_char = cur_char;
640  continue;
641  }
642  }
643  return false;
644  }
645  pattern_str = like_str;
646  return true;
647 }

Member Data Documentation

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

Definition at line 545 of file ParserNode.h.

Referenced by get_arg().

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

Definition at line 547 of file ParserNode.h.

Referenced by get_escape_string().

bool Parser::RegexpExpr::is_not_
private

Definition at line 544 of file ParserNode.h.

Referenced by get_is_not().

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

Definition at line 546 of file ParserNode.h.

Referenced by get_pattern_string().


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