[apple/icu.git] / icuSources / i18n / regeximp.h

// 
//   Copyright (C) 2002-2004 International Business Machines Corporation 
//   and others. All rights reserved.  
//
//   file:  regeximp.h
//
//           ICU Regular Expressions,
//               Definitions of constant values used in the compiled form of
//               a regular expression pattern.
//

#ifndef _REGEXIMP_H
#define _REGEXIMP_H

#include "cmemory.h"

U_NAMESPACE_BEGIN

#ifdef REGEX_DEBUG   /* For debugging, define REGEX_DEBUG in regex.h, not here in this file. */
//
//  debugging options.  Enable one or more of the three #defines immediately following
//

//#define REGEX_SCAN_DEBUG
#define REGEX_DUMP_DEBUG
#define REGEX_RUN_DEBUG

//  End of #defines inteded to be directly set.

#include <stdio.h>
#endif

#ifdef REGEX_SCAN_DEBUG
#define REGEX_SCAN_DEBUG_PRINTF(a) printf a
#else
#define REGEX_SCAN_DEBUG_PRINTF(a)
#endif

#ifdef REGEX_DUMP_DEBUG
#define REGEX_DUMP_DEBUG_PRINTF(a) printf a
#else
#define REGEX_DUMP_DEBUG_PRINTF(a)
#endif

#ifdef REGEX_RUN_DEBUG
#define REGEX_RUN_DEBUG_PRINTF(a) printf a
#define REGEX_DUMP_DEBUG_PRINTF(a) printf a
#else
#define REGEX_RUN_DEBUG_PRINTF(a)
#endif


//
//  Opcode types     In the compiled form of the regexp, these are the type, or opcodes,
//                   of the entries.
//
enum {
     URX_RESERVED_OP   = 0,    // For multi-operand ops, most non-first words.
     URX_RESERVED_OP_N = 255,  // For multi-operand ops, negative operand values.
     URX_BACKTRACK     = 1,
     URX_END           = 2,
     URX_ONECHAR       = 3,    // Value field is the 21 bit unicode char to match
     URX_STRING        = 4,    // Value field is index of string start
     URX_STRING_LEN    = 5,    // Value field is string length (code units)
     URX_STATE_SAVE    = 6,    // Value field is pattern position to push
     URX_NOP           = 7,
     URX_START_CAPTURE = 8,    // Value field is capture group number.
     URX_END_CAPTURE   = 9,    // Value field is capture group number
     URX_STATIC_SETREF = 10,   // Value field is index of set in array of sets.   
     URX_SETREF        = 11,   // Value field is index of set in array of sets.
     URX_DOTANY        = 12, 
     URX_JMP           = 13,   // Value field is destination position in
                                                    //   the pattern.
     URX_FAIL          = 14,   // Stop match operation,  No match.

     URX_JMP_SAV       = 15,   // Operand:  JMP destination location
     URX_BACKSLASH_B   = 16,   // Value field:  0:  \b    1:  \B
     URX_BACKSLASH_G   = 17, 
     URX_JMP_SAV_X     = 18,   // Conditional JMP_SAV,
                               //    Used in (x)+, breaks loop on zero length match.
                               //    Operand:  Jmp destination.
     URX_BACKSLASH_X   = 19,
     URX_BACKSLASH_Z   = 20,   // \z   Unconditional end of line.

     URX_DOTANY_ALL    = 21,   // ., in the . matches any mode.
     URX_BACKSLASH_D   = 22,   // Value field:  0:  \d    1:  \D
     URX_CARET         = 23,   // Value field:  1:  multi-line mode.
     URX_DOLLAR        = 24,  // Also for \Z

     URX_CTR_INIT      = 25,   // Counter Inits for {Interval} loops.
     URX_CTR_INIT_NG   = 26,   //   3 kinds, normal, non-greedy, and possessive.
                               //   These are 4 word opcodes.  See description.
                               //    First Operand:  Data loc of counter variable
                               //    2nd   Operand:  Pat loc of the URX_CTR_LOOPx 
                               //                    at the end of the loop.
                               //    3rd   Operand:  Minimum count.
                               //    4th   Operand:  Max count, -1 for unbounded.

     URX_DOTANY_PL     = 27,   // .+, match rest of the line.  Fail already at end.

     URX_CTR_LOOP      = 28,   // Loop Ops for {interval} loops.
     URX_CTR_LOOP_NG   = 29,   //   Also in three flavors.
                               //   Operand is loc of corresponding CTR_INIT.

     URX_DOTANY_ALL_PL = 30,   // .+, match rest of the Input.  Fail if already at end

     URX_RELOC_OPRND   = 31,   // Operand value in multi-operand ops that refers
                               //   back into compiled pattern code, and thus must
                               //   be relocated when inserting/deleting ops in code.

     URX_STO_SP        = 32,   // Store the stack ptr.  Operand is location within
                               //   matcher data (not stack data) to store it.
     URX_LD_SP         = 33,   // Load the stack pointer.  Operand is location
                               //   to load from.
     URX_BACKREF       = 34,   // Back Reference.  Parameter is the index of the
                               //   capture group variables in the state stack frame.
     URX_STO_INP_LOC   = 35,   // Store the input location.  Operand is location
                               //   within the matcher stack frame.
     URX_JMPX          = 36,  // Conditional JMP.
                               //   First Operand:  JMP target location.
                               //   Second Operand:  Data location containing an 
                               //     input position.  If current input position ==
                               //     saved input position, FAIL rather than taking
                               //     the JMP
     URX_LA_START      = 37,   // Starting a LookAround expression.
                               //   Save InputPos and SP in static data.
                               //   Operand:  Static data offset for the save
     URX_LA_END        = 38,   // Ending a Lookaround expression.
                               //   Restore InputPos and Stack to saved values.
                               //   Operand:  Static data offset for saved data.
     URX_ONECHAR_I     = 39,   // Test for case-insensitive match of a literal character.
                               //   Operand:  the literal char.
     URX_STRING_I      = 40,   // Case insensitive string compare.
                               //   First Operand:  Index of start of string in string literals
                               //   Second Operand (next word in compiled code):
                               //     the length of the string.
     URX_BACKREF_I     = 41,   // Case insensitive back reference.
                               //   Parameter is the index of the
                               //   capture group variables in the state stack frame.
     URX_DOLLAR_M      = 42,   // $ in multi-line mode.
     URX_CARET_M       = 43,   // ^ in multi-line mode.
     URX_LB_START      = 44,   // LookBehind Start.
                               //   Paramater is data location
     URX_LB_CONT       = 45,   // LookBehind Continue.
                               //   Param 0:  the data location
                               //   Param 1:  The minimum length of the look-behind match
                               //   Param 2:  The max length of the look-behind match
     URX_LB_END        = 46,   // LookBehind End.
                               //   Parameter is the data location.
                               //     Check that match ended at the right spot,
                               //     Restore original input string len.
     URX_LBN_CONT      = 47,   // Negative LookBehind Continue
                               //   Param 0:  the data location
                               //   Param 1:  The minimum length of the look-behind match
                               //   Param 2:  The max     length of the look-behind match
                               //   Param 3:  The pattern loc following the look-behind block.
     URX_LBN_END       = 48,   // Negative LookBehind end
                               //   Parameter is the data location.
                               //   Check that the match ended at the right spot.
     URX_STAT_SETREF_N = 49,   // Reference to a prebuilt set (e.g. \w), negated  
                               //   Operand is index of set in array of sets.
     URX_LOOP_SR_I     = 50,   // Init a [set]* loop.
                               //   Operand is the sets index in array of user sets.
     URX_LOOP_C        = 51,   // Continue a [set]* or OneChar* loop.
                               //   Operand is a matcher static data location.
                               //   Must always immediately follow  LOOP_x_I instruction.
     URX_LOOP_DOT_I    = 52,   // .*, initialization of the optimized loop.
                               //   Operand value:
                               //      0:  Normal (. doesn't match new-line) mode.
                               //      1:  . matches new-line mode.
     URX_BACKSLASH_BU  = 53    // \b or \B in UREGEX_UWORD mode, using Unicode style
                               //   word boundaries.

};           

// Keep this list of opcode names in sync with the above enum
//   Used for debug printing only.
#define URX_OPCODE_NAMES       \
        "               ",     \
        "BACKTRACK",           \
        "END",                 \
        "ONECHAR",             \
        "STRING",              \
        "STRING_LEN",          \
        "STATE_SAVE",          \
        "NOP",                 \
        "START_CAPTURE",       \
        "END_CAPTURE",         \
        "URX_STATIC_SETREF",   \
        "SETREF",              \
        "DOTANY",              \
        "JMP",                 \
        "FAIL",                \
        "JMP_SAV",             \
        "BACKSLASH_B",         \
        "BACKSLASH_G",         \
        "JMP_SAV_X",           \
        "BACKSLASH_X",         \
        "BACKSLASH_Z",         \
        "DOTANY_ALL",          \
        "BACKSLASH_D",         \
        "CARET",               \
        "DOLLAR",              \
        "CTR_INIT",            \
        "CTR_INIT_NG",         \
        "DOTANY_PL",           \
        "CTR_LOOP",            \
        "CTR_LOOP_NG",         \
        "DOTANY_ALL_PL",       \
        "RELOC_OPRND",         \
        "STO_SP",              \
        "LD_SP",               \
        "BACKREF",             \
        "STO_INP_LOC",         \
        "JMPX",                \
        "LA_START",            \
        "LA_END",              \
        "ONECHAR_I",           \
        "STRING_I",            \
        "BACKREF_I",           \
        "DOLLAR_M",            \
        "CARET_M",             \
        "LB_START",            \
        "LB_CONT",             \
        "LB_END",              \
        "LBN_CONT",            \
        "LBN_END",             \
        "STAT_SETREF_N",       \
        "LOOP_SR_I",           \
        "LOOP_C",              \
        "LOOP_DOT_I",          \
        "BACKSLASH_BU"


//
//  Convenience macros for assembling and disassembling a compiled operation.
//
#define URX_BUILD(type, val) (int32_t)((type << 24) | (val))
#define URX_TYPE(x)          ((uint32_t)(x) >> 24) 
#define URX_VAL(x)           ((x) & 0xffffff)

                
//
//  Access to Unicode Sets composite character properties
//     The sets are accessed by the match engine for things like \w (word boundary)
//     
enum {
     URX_ISWORD_SET  = 1,
     URX_ISALNUM_SET = 2,
     URX_ISALPHA_SET = 3,
     URX_ISSPACE_SET = 4,

     URX_GC_NORMAL,          // Sets for finding grapheme cluster boundaries.
     URX_GC_EXTEND,
     URX_GC_CONTROL,
     URX_GC_L,
     URX_GC_LV,
     URX_GC_LVT,
     URX_GC_V,
     URX_GC_T,

     URX_LAST_SET,

     URX_NEG_SET     = 0x800000          // Flag bit to reverse sense of set
                                         //   membership test.
};


//
//  Match Engine State Stack Frame Layout.
//
struct REStackFrame {
    int32_t            fInputIdx;        // Position of next character in the input string
    int32_t            fPatIdx;          // Position of next Op in the compiled pattern
    int32_t            fExtra[2];        // Extra state, for capture group start/ends
                                         //   atomic parentheses, repeat counts, etc.
                                         //   Locations assigned at pattern compile time.
};

//
//  Start-Of-Match type.  Used by find() to quickly scan to positions where a
//                        match might start before firing up the full match engine.
//
enum StartOfMatch {
    START_NO_INFO,             // No hint available.
    START_CHAR,                // Match starts with a literal code point.
    START_SET,                 // Match starts with something matching a set.
    START_START,               // Match starts at start of buffer only (^ or \A)
    START_LINE,                // Match starts with ^ in multi-line mode.
    START_STRING               // Match starts with a literal string.
};

#define START_OF_MATCH_STR(v) ((v)==START_NO_INFO? "START_NO_INFO" : \
                               (v)==START_CHAR?    "START_CHAR"    : \
                               (v)==START_SET?     "START_SET"     : \
                               (v)==START_START?   "START_START"   : \
                               (v)==START_LINE?    "START_LINE"    : \
                               (v)==START_STRING?  "START_STRING"  : \
                                                   "ILLEGAL")
    

//
//  8 bit set, to fast-path latin-1 set membership tests.
//
struct Regex8BitSet : public UMemory {
    inline Regex8BitSet();
    inline void operator = (const Regex8BitSet &s);
    inline void init(const UnicodeSet *src);
    inline UBool contains(UChar32 c);
    inline void  add(UChar32 c);
    int8_t d[32];
};

inline Regex8BitSet::Regex8BitSet() {
    uprv_memset(d, 0, sizeof(d));
}

inline UBool Regex8BitSet::contains(UChar32 c) {
    // No bounds checking!  This is deliberate.
    return ((d[c>>3] & 1 <<(c&7)) != 0);
};

inline void  Regex8BitSet::add(UChar32 c) {
    d[c>>3] |= 1 << (c&7);
};

inline void Regex8BitSet::init(const UnicodeSet *s) {
    if (s != NULL) {
        for (int i=0; i<=255; i++) {
            if (s->contains(i)) {
                this->add(i);
            }
        }
    }
}

inline void Regex8BitSet::operator = (const Regex8BitSet &s) {
   uprv_memcpy(d, s.d, sizeof(d));
}


U_NAMESPACE_END
#endif
Commit	Line	Data
b75a7d8f	1	//
374ca955	2	// Copyright (C) 2002-2004 International Business Machines Corporation
b75a7d8f A	3	// and others. All rights reserved.
	4	//
	5	// file: regeximp.h
	6	//
	7	// ICU Regular Expressions,
	8	// Definitions of constant values used in the compiled form of
	9	// a regular expression pattern.
	10	//
	11
	12	#ifndef _REGEXIMP_H
	13	#define _REGEXIMP_H
	14
	15	#include "cmemory.h"
	16
	17	U_NAMESPACE_BEGIN
	18
374ca955	19	#ifdef REGEX_DEBUG /* For debugging, define REGEX_DEBUG in regex.h, not here in this file. */
b75a7d8f	20	//
374ca955	21	// debugging options. Enable one or more of the three #defines immediately following
b75a7d8f	22	//
374ca955	23
b75a7d8f	24	//#define REGEX_SCAN_DEBUG
374ca955 A	25	#define REGEX_DUMP_DEBUG
	26	#define REGEX_RUN_DEBUG
	27
b75a7d8f A	28	// End of #defines inteded to be directly set.
b75a7d8f A	29
b75a7d8f A	30	#include <stdio.h>
	31	#endif
	32
	33	#ifdef REGEX_SCAN_DEBUG
374ca955	34	#define REGEX_SCAN_DEBUG_PRINTF(a) printf a
b75a7d8f	35	#else
374ca955	36	#define REGEX_SCAN_DEBUG_PRINTF(a)
b75a7d8f A	37	#endif
	38
	39	#ifdef REGEX_DUMP_DEBUG
374ca955	40	#define REGEX_DUMP_DEBUG_PRINTF(a) printf a
b75a7d8f	41	#else
374ca955	42	#define REGEX_DUMP_DEBUG_PRINTF(a)
b75a7d8f A	43	#endif
	44
	45	#ifdef REGEX_RUN_DEBUG
374ca955 A	46	#define REGEX_RUN_DEBUG_PRINTF(a) printf a
374ca955 A	47	#define REGEX_DUMP_DEBUG_PRINTF(a) printf a
b75a7d8f	48	#else
374ca955	49	#define REGEX_RUN_DEBUG_PRINTF(a)
b75a7d8f A	50	#endif
	51
	52
	53	//
	54	// Opcode types In the compiled form of the regexp, these are the type, or opcodes,
	55	// of the entries.
	56	//
	57	enum {
	58	URX_RESERVED_OP = 0, // For multi-operand ops, most non-first words.
	59	URX_RESERVED_OP_N = 255, // For multi-operand ops, negative operand values.
	60	URX_BACKTRACK = 1,
	61	URX_END = 2,
	62	URX_ONECHAR = 3, // Value field is the 21 bit unicode char to match
	63	URX_STRING = 4, // Value field is index of string start
	64	URX_STRING_LEN = 5, // Value field is string length (code units)
	65	URX_STATE_SAVE = 6, // Value field is pattern position to push
	66	URX_NOP = 7,
	67	URX_START_CAPTURE = 8, // Value field is capture group number.
	68	URX_END_CAPTURE = 9, // Value field is capture group number
	69	URX_STATIC_SETREF = 10, // Value field is index of set in array of sets.
	70	URX_SETREF = 11, // Value field is index of set in array of sets.
	71	URX_DOTANY = 12,
	72	URX_JMP = 13, // Value field is destination position in
	73	// the pattern.
	74	URX_FAIL = 14, // Stop match operation, No match.
	75
	76	URX_JMP_SAV = 15, // Operand: JMP destination location
	77	URX_BACKSLASH_B = 16, // Value field: 0: \b 1: \B
	78	URX_BACKSLASH_G = 17,
	79	URX_JMP_SAV_X = 18, // Conditional JMP_SAV,
	80	// Used in (x)+, breaks loop on zero length match.
	81	// Operand: Jmp destination.
	82	URX_BACKSLASH_X = 19,
	83	URX_BACKSLASH_Z = 20, // \z Unconditional end of line.
	84
	85	URX_DOTANY_ALL = 21, // ., in the . matches any mode.
	86	URX_BACKSLASH_D = 22, // Value field: 0: \d 1: \D
	87	URX_CARET = 23, // Value field: 1: multi-line mode.
	88	URX_DOLLAR = 24, // Also for \Z
	89
	90	URX_CTR_INIT = 25, // Counter Inits for {Interval} loops.
	91	URX_CTR_INIT_NG = 26, // 3 kinds, normal, non-greedy, and possessive.
	92	// These are 4 word opcodes. See description.
	93	// First Operand: Data loc of counter variable
	94	// 2nd Operand: Pat loc of the URX_CTR_LOOPx
	95	// at the end of the loop.
	96	// 3rd Operand: Minimum count.
	97	// 4th Operand: Max count, -1 for unbounded.
	98
	99	URX_DOTANY_PL = 27, // .+, match rest of the line. Fail already at end.
	100
	101	URX_CTR_LOOP = 28, // Loop Ops for {interval} loops.
	102	URX_CTR_LOOP_NG = 29, // Also in three flavors.
	103	// Operand is loc of corresponding CTR_INIT.
	104
	105	URX_DOTANY_ALL_PL = 30, // .+, match rest of the Input. Fail if already at end
	106
	107	URX_RELOC_OPRND = 31, // Operand value in multi-operand ops that refers
	108	// back into compiled pattern code, and thus must
	109	// be relocated when inserting/deleting ops in code.
	110
	111	URX_STO_SP = 32, // Store the stack ptr. Operand is location within
	112	// matcher data (not stack data) to store it.
	113	URX_LD_SP = 33, // Load the stack pointer. Operand is location
114	// to load from.
115	URX_BACKREF = 34, // Back Reference. Parameter is the index of the
116	// capture group variables in the state stack frame.
117	URX_STO_INP_LOC = 35, // Store the input location. Operand is location
118	// within the matcher stack frame.
119	URX_JMPX = 36, // Conditional JMP.
120	// First Operand: JMP target location.
121	// Second Operand: Data location containing an
122	// input position. If current input position ==
123	// saved input position, FAIL rather than taking
124	// the JMP
125	URX_LA_START = 37, // Starting a LookAround expression.
126	// Save InputPos and SP in static data.
127	// Operand: Static data offset for the save
128	URX_LA_END = 38, // Ending a Lookaround expression.
129	// Restore InputPos and Stack to saved values.
130	// Operand: Static data offset for saved data.
131	URX_ONECHAR_I = 39, // Test for case-insensitive match of a literal character.
132	// Operand: the literal char.
133	URX_STRING_I = 40, // Case insensitive string compare.
134	// First Operand: Index of start of string in string literals
135	// Second Operand (next word in compiled code):
136	// the length of the string.
137	URX_BACKREF_I = 41, // Case insensitive back reference.
138	// Parameter is the index of the
139	// capture group variables in the state stack frame.
140	URX_DOLLAR_M = 42, // $ in multi-line mode.
141	URX_CARET_M = 43, // ^ in multi-line mode.
142	URX_LB_START = 44, // LookBehind Start.
143	// Paramater is data location
144	URX_LB_CONT = 45, // LookBehind Continue.
145	// Param 0: the data location
146	// Param 1: The minimum length of the look-behind match
147	// Param 2: The max length of the look-behind match
148	URX_LB_END = 46, // LookBehind End.
149	// Parameter is the data location.
150	// Check that match ended at the right spot,
151	// Restore original input string len.
152	URX_LBN_CONT = 47, // Negative LookBehind Continue
153	// Param 0: the data location
154	// Param 1: The minimum length of the look-behind match
155	// Param 2: The max length of the look-behind match
156	// Param 3: The pattern loc following the look-behind block.
157	URX_LBN_END = 48, // Negative LookBehind end
158	// Parameter is the data location.
159	// Check that the match ended at the right spot.
160	URX_STAT_SETREF_N = 49, // Reference to a prebuilt set (e.g. \w), negated
161	// Operand is index of set in array of sets.
162	URX_LOOP_SR_I = 50, // Init a [set]* loop.
163	// Operand is the sets index in array of user sets.
164	URX_LOOP_C = 51, // Continue a [set]* or OneChar* loop.
165	// Operand is a matcher static data location.
166	// Must always immediately follow LOOP_x_I instruction.
374ca955	167	URX_LOOP_DOT_I = 52, // .*, initialization of the optimized loop.
b75a7d8f A	168	// Operand value:
	169	// 0: Normal (. doesn't match new-line) mode.
	170	// 1: . matches new-line mode.
374ca955 A	171	URX_BACKSLASH_BU = 53 // \b or \B in UREGEX_UWORD mode, using Unicode style
374ca955 A	172	// word boundaries.
b75a7d8f A	173
	174	};
	175
	176	// Keep this list of opcode names in sync with the above enum
	177	// Used for debug printing only.
	178	#define URX_OPCODE_NAMES \
	179	" ", \
	180	"BACKTRACK", \
	181	"END", \
	182	"ONECHAR", \
	183	"STRING", \
	184	"STRING_LEN", \
	185	"STATE_SAVE", \
	186	"NOP", \
	187	"START_CAPTURE", \
	188	"END_CAPTURE", \
	189	"URX_STATIC_SETREF", \
	190	"SETREF", \
	191	"DOTANY", \
	192	"JMP", \
	193	"FAIL", \
	194	"JMP_SAV", \
	195	"BACKSLASH_B", \
	196	"BACKSLASH_G", \
	197	"JMP_SAV_X", \
	198	"BACKSLASH_X", \
	199	"BACKSLASH_Z", \
	200	"DOTANY_ALL", \
	201	"BACKSLASH_D", \
	202	"CARET", \
	203	"DOLLAR", \
	204	"CTR_INIT", \
	205	"CTR_INIT_NG", \
	206	"DOTANY_PL", \
	207	"CTR_LOOP", \
	208	"CTR_LOOP_NG", \
	209	"DOTANY_ALL_PL", \
	210	"RELOC_OPRND", \
	211	"STO_SP", \
	212	"LD_SP", \
	213	"BACKREF", \
	214	"STO_INP_LOC", \
	215	"JMPX", \
	216	"LA_START", \
	217	"LA_END", \
	218	"ONECHAR_I", \
	219	"STRING_I", \
	220	"BACKREF_I", \
	221	"DOLLAR_M", \
	222	"CARET_M", \
	223	"LB_START", \
	224	"LB_CONT", \
	225	"LB_END", \
	226	"LBN_CONT", \
	227	"LBN_END", \
	228	"STAT_SETREF_N", \
	229	"LOOP_SR_I", \
	230	"LOOP_C", \
374ca955 A	231	"LOOP_DOT_I", \
374ca955 A	232	"BACKSLASH_BU"
b75a7d8f A	233
	234
	235	//
	236	// Convenience macros for assembling and disassembling a compiled operation.
	237	//
	238	#define URX_BUILD(type, val) (int32_t)((type << 24) \| (val))
	239	#define URX_TYPE(x) ((uint32_t)(x) >> 24)
	240	#define URX_VAL(x) ((x) & 0xffffff)
	241
	242
	243	//
	244	// Access to Unicode Sets composite character properties
	245	// The sets are accessed by the match engine for things like \w (word boundary)
	246	//
	247	enum {
	248	URX_ISWORD_SET = 1,
	249	URX_ISALNUM_SET = 2,
	250	URX_ISALPHA_SET = 3,
	251	URX_ISSPACE_SET = 4,
	252
	253	URX_GC_NORMAL, // Sets for finding grapheme cluster boundaries.
	254	URX_GC_EXTEND,
	255	URX_GC_CONTROL,
	256	URX_GC_L,
	257	URX_GC_LV,
	258	URX_GC_LVT,
	259	URX_GC_V,
	260	URX_GC_T,
	261
	262	URX_LAST_SET,
	263
	264	URX_NEG_SET = 0x800000 // Flag bit to reverse sense of set
	265	// membership test.
	266	};
	267
	268
	269	//
	270	// Match Engine State Stack Frame Layout.
	271	//
	272	struct REStackFrame {
	273	int32_t fInputIdx; // Position of next character in the input string
	274	int32_t fPatIdx; // Position of next Op in the compiled pattern
	275	int32_t fExtra[2]; // Extra state, for capture group start/ends
	276	// atomic parentheses, repeat counts, etc.
	277	// Locations assigned at pattern compile time.
	278	};
	279
	280	//
	281	// Start-Of-Match type. Used by find() to quickly scan to positions where a
	282	// match might start before firing up the full match engine.
	283	//
	284	enum StartOfMatch {
	285	START_NO_INFO, // No hint available.
	286	START_CHAR, // Match starts with a literal code point.
	287	START_SET, // Match starts with something matching a set.
	288	START_START, // Match starts at start of buffer only (^ or \A)
	289	START_LINE, // Match starts with ^ in multi-line mode.
	290	START_STRING // Match starts with a literal string.
	291	};
	292
	293	#define START_OF_MATCH_STR(v) ((v)==START_NO_INFO? "START_NO_INFO" : \
	294	(v)==START_CHAR? "START_CHAR" : \
	295	(v)==START_SET? "START_SET" : \
	296	(v)==START_START? "START_START" : \
297	(v)==START_LINE? "START_LINE" : \
298	(v)==START_STRING? "START_STRING" : \
299	"ILLEGAL")
300
301
302	//
303	// 8 bit set, to fast-path latin-1 set membership tests.
304	//
305	struct Regex8BitSet : public UMemory {
306	inline Regex8BitSet();
307	inline void operator = (const Regex8BitSet &s);
308	inline void init(const UnicodeSet *src);
309	inline UBool contains(UChar32 c);
310	inline void add(UChar32 c);
311	int8_t d[32];
312	};
313
314	inline Regex8BitSet::Regex8BitSet() {
315	uprv_memset(d, 0, sizeof(d));
316	}
317
318	inline UBool Regex8BitSet::contains(UChar32 c) {
319	// No bounds checking! This is deliberate.
320	return ((d[c>>3] & 1 <<(c&7)) != 0);
321	};
322
323	inline void Regex8BitSet::add(UChar32 c) {
324	d[c>>3] \|= 1 << (c&7);
325	};
326
327	inline void Regex8BitSet::init(const UnicodeSet *s) {
328	if (s != NULL) {
374ca955	329	for (int i=0; i<=255; i++) {
b75a7d8f A	330	if (s->contains(i)) {
	331	this->add(i);
	332	}
	333	}
	334	}
	335	}
	336
	337	inline void Regex8BitSet::operator = (const Regex8BitSet &s) {
	338	uprv_memcpy(d, s.d, sizeof(d));
	339	}
	340
	341
	342	U_NAMESPACE_END
	343	#endif
	344