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
