regexp9.h

#ifndef _REGEXP9_H_
#define _REGEXP9_H_ 1

/*********
 * utf.h *
 *********/

typedef unsigned short Rune;

typedef struct Resub		Resub;
typedef struct Reclass		Reclass;
typedef struct Reinst		Reinst;
typedef struct Reprog		Reprog;

enum
{
    UTFmax      = 3,        /* maximum bytes per rune */
    Runesync    = 0x80,     /* cannot represent part of a UTF sequence (<) */
    Runeself    = 0x80,     /* rune and UTF sequences are the same (<) */
    Runeerror   = 0xFFFD        /* decoding error in UTF */
};

/*************
 * regexp9.h *
 *************/

#if defined(__cplusplus)
extern "C" { 
#endif

#ifdef AUTOLIB
AUTOLIB(regexp9)
#endif

/*
 *	Sub expression matches
 */
struct Resub{
	union
	{
		char *sp;
		Rune *rsp;
	}s;
	union
	{
		char *ep;
		Rune *rep;
	}e;
};

/*
 *	character class, each pair of rune's defines a range
 */
struct Reclass{
	Rune	*end;
	Rune	spans[64];
};

/*
 *	Machine instructions
 */
struct Reinst{
	int	type;
	union	{
		Reclass	*cp;		/* class pointer */
		Rune	r;		/* character */
		int	subid;		/* sub-expression id for RBRA and LBRA */
		Reinst	*right;		/* right child of OR */
	}u1;
	union {	/* regexp relies on these two being in the same union */
		Reinst *left;		/* left child of OR */
		Reinst *next;		/* next instruction for CAT & LBRA */
	}u2;
};

/*
 *	Reprogram definition
 */
struct Reprog{
	Reinst	*startinst;	/* start pc */
	Reclass	class[16];	/* .data */
	Reinst	firstinst[5];	/* .text */
};

extern Reprog	*regcomp9(char*);
extern Reprog	*regcomplit9(char*);
extern Reprog	*regcompnl9(char*);
extern void	regerror9(char*);
extern int	regexec9(const Reprog*, char*, Resub*, int);
extern void	regsub9(char*, char*, int, Resub*, int);

extern int	rregexec9(const Reprog*, Rune*, Resub*, int);
extern void	rregsub9(Rune*, Rune*, int, Resub*, int);

extern int chartorune(Rune *rune, const char *str);
extern Rune* runestrchr(const Rune *s, Rune c);
extern char* utfrune(char *s, long c);

#if defined(__cplusplus)
}
#endif

/*************
 * regcomp.h *
 *************/

/*
 *  substitution list
 */
#define uchar __reuchar
typedef unsigned char uchar;
#define nelem(x) (sizeof(x)/sizeof((x)[0]))

#define NSUBEXP 32
typedef struct Resublist	Resublist;
struct	Resublist
{
	Resub	m[NSUBEXP];
};

/* max character classes per program */
extern Reprog	RePrOg;
#define	NCLASS	(sizeof(RePrOg.class)/sizeof(Reclass))

/* max rune ranges per character class */
#define NCCRUNE	(sizeof(Reclass)/sizeof(Rune))

/*
 * Actions and Tokens (Reinst types)
 *
 *	02xx are operators, value == precedence
 *	03xx are tokens, i.e. operands for operators
 */
#define RUNE		0177
#define	OPERATOR	0200	/* Bitmask of all operators */
#define	START		0200	/* Start, used for marker on stack */
#define	RBRA		0201	/* Right bracket, ) */
#define	LBRA		0202	/* Left bracket, ( */
#define	OR		0203	/* Alternation, | */
#define	CAT		0204	/* Concatentation, implicit operator */
#define	STAR		0205	/* Closure, * */
#define	PLUS		0206	/* a+ == aa* */
#define	QUEST		0207	/* a? == a|nothing, i.e. 0 or 1 a's */
#define	ANY		0300	/* Any character except newline, . */
#define	ANYNL		0301	/* Any character including newline, . */
#define	NOP		0302	/* No operation, internal use only */
#define	BOL		0303	/* Beginning of line, ^ */
#define	EOL		0304	/* End of line, $ */
#define	CCLASS		0305	/* Character class, [] */
#define	NCCLASS		0306	/* Negated character class, [] */
#define	END		0377	/* Terminate: match found */

/*
 *  regexec execution lists
 */
#define LISTSIZE	10
#define BIGLISTSIZE	(10*LISTSIZE)
typedef struct Relist	Relist;
struct Relist
{
	Reinst*		inst;		/* Reinstruction of the thread */
	Resublist	se;		/* matched subexpressions in this thread */
};
typedef struct Reljunk	Reljunk;
struct	Reljunk
{
	Relist*	relist[2];
	Relist*	reliste[2];
	int	starttype;
	Rune	startchar;
	char*	starts;
	char*	eol;
	Rune*	rstarts;
	Rune*	reol;
};

#endif