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 27 typedef 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 44 typedef 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 55 typedef struct SRE_REPEAT_T { 56 Py_ssize_t count; 57 SRE_CODE* pattern; /* points to REPEAT operator arguments */ 58 void* last_ptr; /* helper to check for infinite loops */ 59 struct SRE_REPEAT_T *prev; /* points to previous repeat context */ 60 } SRE_REPEAT; 61 62 typedef struct { 63 /* string pointers */ 64 void* ptr; /* current position (also end of current slice) */ 65 void* beginning; /* start of original string */ 66 void* start; /* start of current slice */ 67 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 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 88 typedef struct { 89 PyObject_HEAD 90 PyObject* pattern; 91 SRE_STATE state; 92 } ScannerObject; 93 94 #endif 95
