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 Py_UNICODE character) */
18 #ifdef Py_UNICODE_WIDE
19 #define SRE_CODE Py_UCS4
20 #else
21 #define SRE_CODE unsigned short
22 #endif
23 
24 typedef struct {
25     PyObject_VAR_HEAD
26     Py_ssize_t groups; /* must be first! */
27     PyObject* groupindex;
28     PyObject* indexgroup;
29     /* compatibility */
30     PyObject* pattern; /* pattern source (or None) */
31     int flags; /* flags used when compiling pattern source */
32     PyObject *weakreflist; /* List of weak references */
33     /* pattern code */
34     Py_ssize_t codesize;
35     SRE_CODE code[1];
36 } PatternObject;
37 
38 #define PatternObject_GetCode(o) (((PatternObject*)(o))->code)
39 
40 typedef struct {
41     PyObject_VAR_HEAD
42     PyObject* string; /* link to the target string (must be first) */
43     PyObject* regs; /* cached list of matching spans */
44     PatternObject* pattern; /* link to the regex (pattern) object */
45     Py_ssize_t pos, endpos; /* current target slice */
46     Py_ssize_t lastindex; /* last index marker seen by the engine (-1 if none) */
47     Py_ssize_t groups; /* number of groups (start/end marks) */
48     Py_ssize_t mark[1];
49 } MatchObject;
50 
51 typedef unsigned int (*SRE_TOLOWER_HOOK)(unsigned int ch);
52 
53 /* FIXME: <fl> shouldn't be a constant, really... */
54 #define SRE_MARK_SIZE 200
55 
56 typedef struct SRE_REPEAT_T {
57     Py_ssize_t count;
58     SRE_CODE* pattern; /* points to REPEAT operator arguments */
59     void* last_ptr; /* helper to check for infinite loops */
60     struct SRE_REPEAT_T *prev; /* points to previous repeat context */
61 } SRE_REPEAT;
62 
63 typedef struct {
64     /* string pointers */
65     void* ptr; /* current position (also end of current slice) */
66     void* beginning; /* start of original string */
67     void* start; /* start of current slice */
68     void* end; /* end of original string */
69     /* attributes for the match object */
70     PyObject* string;
71     Py_ssize_t pos, endpos;
72     /* character size */
73     int charsize;
74     /* registers */
75     Py_ssize_t lastindex;
76     Py_ssize_t lastmark;
77     void* mark[SRE_MARK_SIZE];
78     /* dynamically allocated stuff */
79     char* data_stack;
80     size_t data_stack_size;
81     size_t data_stack_base;
82     /* current repeat context */
83     SRE_REPEAT *repeat;
84     /* hooks */
85     SRE_TOLOWER_HOOK lower;
86 } SRE_STATE;
87 
88 typedef struct {
89     PyObject_HEAD
90     PyObject* pattern;
91     SRE_STATE state;
92 } ScannerObject;
93 
94 #endif
95