1/*
2 * Secret Labs' Regular Expression Engine
3 *
4 * regular expression matching engine
5 *
6 * Copyright (c) 1997-2001 by Secret Labs AB. All rights reserved.
7 *
8 * See the _sre.c file for information on usage and redistribution.
9 */
10
11#ifndef SRE_INCLUDED
12#define SRE_INCLUDED
13
14#include "sre_constants.h"
15
16/* size of a code word (must be unsigned short or larger, and
17 large enough to hold a UCS4 character) */
18#define SRE_CODE Py_UCS4
19#if SIZEOF_SIZE_T > 4
20# define SRE_MAXREPEAT (~(SRE_CODE)0)
21# define SRE_MAXGROUPS ((~(SRE_CODE)0) / 2)
22#else
23# define SRE_MAXREPEAT ((SRE_CODE)PY_SSIZE_T_MAX)
24# define SRE_MAXGROUPS ((SRE_CODE)PY_SSIZE_T_MAX / SIZEOF_SIZE_T / 2)
25#endif
26
27typedef struct {
28 PyObject_VAR_HEAD
29 Py_ssize_t groups; /* must be first! */
30 PyObject* groupindex; /* dict */
31 PyObject* indexgroup; /* tuple */
32 /* compatibility */
33 PyObject* pattern; /* pattern source (or None) */
34 int flags; /* flags used when compiling pattern source */
35 PyObject *weakreflist; /* List of weak references */
36 int isbytes; /* pattern type (1 - bytes, 0 - string, -1 - None) */
37 /* pattern code */
38 Py_ssize_t codesize;
39 SRE_CODE code[1];
40} PatternObject;
41
42#define PatternObject_GetCode(o) (((PatternObject*)(o))->code)
43
44typedef struct {
45 PyObject_VAR_HEAD
46 PyObject* string; /* link to the target string (must be first) */
47 PyObject* regs; /* cached list of matching spans */
48 PatternObject* pattern; /* link to the regex (pattern) object */
49 Py_ssize_t pos, endpos; /* current target slice */
50 Py_ssize_t lastindex; /* last index marker seen by the engine (-1 if none) */
51 Py_ssize_t groups; /* number of groups (start/end marks) */
52 Py_ssize_t mark[1];
53} MatchObject;
54
55typedef struct SRE_REPEAT_T {
56 Py_ssize_t count;
57 const SRE_CODE* pattern; /* points to REPEAT operator arguments */
58 const void* last_ptr; /* helper to check for infinite loops */
59 struct SRE_REPEAT_T *prev; /* points to previous repeat context */
60} SRE_REPEAT;
61
62typedef struct {
63 /* string pointers */
64 const void* ptr; /* current position (also end of current slice) */
65 const void* beginning; /* start of original string */
66 const void* start; /* start of current slice */
67 const void* end; /* end of original string */
68 /* attributes for the match object */
69 PyObject* string;
70 Py_buffer buffer;
71 Py_ssize_t pos, endpos;
72 int isbytes;
73 int charsize; /* character size */
74 /* registers */
75 Py_ssize_t lastindex;
76 Py_ssize_t lastmark;
77 const void** mark;
78 int match_all;
79 int must_advance;
80 /* dynamically allocated stuff */
81 char* data_stack;
82 size_t data_stack_size;
83 size_t data_stack_base;
84 /* current repeat context */
85 SRE_REPEAT *repeat;
86} SRE_STATE;
87
88typedef struct {
89 PyObject_HEAD
90 PyObject* pattern;
91 SRE_STATE state;
92 int executing;
93} ScannerObject;
94
95#endif
96