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EST_Regex.h
/************************************************************************/
/* */
/* Centre for Speech Technology Research */
/* University of Edinburgh, UK */
/* Copyright (c) 1997 */
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/************************************************************************/
#ifndef __EST_REGEX_H__
#define __EST_REGEX_H__
class EST_Regex;
#include "EST_String.h"
/** A Regular expression class to go with the CSTR EST_String class.
*
* The regular expression syntax is the FSF syntax used in emacs and
* in the FSF String library. This is translated into the syntax supported
* by Henry Spensor's regular expression library, this translation is a place
* to look if you find regular expressions not matching where expected.
*
* @see EST_String
* @see string_example
* @author Richard Caley <rjc@cstr.ed.ac.uk>
* @author (regular expression library by Henry Spencer, University of Toronto)
* @version $Id: EST_Regex.h,v 1.3 2004/05/04 00:00:16 awb Exp $
*/
class EST_Regex : protected EST_String {
private:
/// The compiled form.
void *compiled;
/// Compiled form for whole string match.
void *compiled_match;
protected:
/// Compile expression.
void compile();
/// Compile expression in a form which only matches whole string.
void compile_match();
/// Translate the expression into the internally used syntax.
char *regularize(int match) const;
public:
/// Empty constructor, just for form.
EST_Regex(void);
/// Construct from EST_String.
EST_Regex(EST_String s);
/// Construct from C string.
EST_Regex(const char *ex);
/// Copy constructor.
EST_Regex(const EST_Regex &ex);
/// Destructor.
~EST_Regex();
/// Size of the expression.
int size() const { return EST_String::size; };
/// Run to find a matching substring
int run(const char *on, int from, int &start, int &end, int *starts=NULL, int *ends=NULL);
/// Run to see if it matches the entire string.
int run_match(const char *on, int from=0, int *starts=NULL, int *ends=NULL);
/// Get the expression as a string.
EST_String tostring(void) const {return (*this);};
/// Cast operator, disambiguates it for some compilers
operator const char *() const { return (const char *)tostring(); }
int operator == (const EST_Regex ex) const
{ return (const EST_String)*this == (const EST_String)ex; }
int operator != (const EST_Regex ex) const
{ return (const EST_String)*this != (const EST_String)ex; }
/**@name Assignment */
//@{
///
EST_Regex &operator = (const EST_Regex ex);
///
EST_Regex &operator = (const EST_String s);
///
EST_Regex &operator = (const char *s);
//@}
/// Stream output of regular expression.
friend ostream &operator << (ostream &s, const EST_Regex &str);
};
ostream &operator << (ostream &s, const EST_Regex &str);
/**@name Predefined_regular_expressions
* Some regular expressions matching common things are predefined
*/
//@{
/// White space
extern EST_Regex RXwhite; // "[ \n\t\r]+"
/// Sequence of alphabetic characters.
extern EST_Regex RXalpha; // "[A-Za-z]+"
/// Sequence of lower case alphabetic characters.
extern EST_Regex RXlowercase; // "[a-z]+"
/// Sequence of upper case alphabetic characters.
extern EST_Regex RXuppercase; // "[A-Z]+"
/// Sequence of letters and/or digits.
extern EST_Regex RXalphanum; // "[0-9A-Za-z]+"
/// Initial letter or underscore followed by letters underscores or digits.
extern EST_Regex RXidentifier; // "[A-Za-z_][0-9A-Za-z_]+"
/// Integer.
extern EST_Regex RXint; // "-?[0-9]+"
/// Floating point number.
extern EST_Regex RXdouble; // "-?\\‍(\\‍([0-9]+\\.[0-9]*\\‍)\\|\\‍([0-9]+\\‍)\\|\\‍(\\.[0-9]+\\‍)\\‍)\\‍([eE][---+]?[0-9]+\\‍)?"
//@}
// GCC lets us use the static constant to declare arrays, Sun CC
// doesn't, so for a quiet, if ugly, life we declare it here with a suitable
// value and check in EST_Regex.cc to make sure it`s OK
#define EST_Regex_max_subexpressions 10
#endif
EST_Regex
Definition EST_Regex.h:55
EST_Regex::regularize
char * regularize(int match) const
Translate the expression into the internally used syntax.
Definition EST_Regex.cc:152
EST_Regex::EST_Regex
EST_Regex(void)
Empty constructor, just for form.
Definition EST_Regex.cc:111
EST_Regex::run
int run(const char *on, int from, int &start, int &end, int *starts=NULL, int *ends=NULL)
Run to find a matching substring.
Definition EST_Regex.cc:242
EST_Regex::compile
void compile()
Compile expression.
Definition EST_Regex.cc:213
EST_Regex::operator<<
friend ostream & operator<<(ostream &s, const EST_Regex &str)
Stream output of regular expression.
Definition EST_Regex.cc:330
EST_Regex::compile_match
void compile_match()
Compile expression in a form which only matches whole string.
Definition EST_Regex.cc:227
EST_Regex::tostring
EST_String tostring(void) const
Get the expression as a string.
Definition EST_Regex.h:96
EST_Regex::run_match
int run_match(const char *on, int from=0, int *starts=NULL, int *ends=NULL)
Run to see if it matches the entire string.
Definition EST_Regex.cc:275
EST_Regex::size
int size() const
Size of the expression.
Definition EST_Regex.h:88
EST_Regex::~EST_Regex
~EST_Regex()
Destructor.
Definition EST_Regex.cc:140
EST_String
Definition EST_String.h:70
EST_String::str
const char * str(void) const
Get a const-pointer to the actual memory.
Definition EST_String.h:245