544 lines
16 KiB
C
544 lines
16 KiB
C
/* Extended regular expression matching and search library.
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _REGEX_INTERNAL_H
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#define _REGEX_INTERNAL_H 1
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/* Number of bits in a byte. */
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#define BYTE_BITS 8
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/* Number of single byte character. */
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#define SBC_MAX 256
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#define COLL_ELEM_LEN_MAX 8
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/* The character which represents newline. */
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#define NEWLINE_CHAR '\n'
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/* Rename to standard API for using out of glibc. */
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#ifndef _LIBC
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# define __wctype wctype
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# define __iswctype iswctype
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# define __btowc btowc
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# define __mempcpy memcpy
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#endif
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extern const char re_error_msgid[];
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extern const size_t re_error_msgid_idx[];
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/* Number of bits in an unsinged int. */
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#define UINT_BITS (sizeof (unsigned int) * BYTE_BITS)
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/* Number of unsigned int in an bit_set. */
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#define BITSET_UINTS ((SBC_MAX + UINT_BITS - 1) / UINT_BITS)
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typedef unsigned int bitset[BITSET_UINTS];
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typedef unsigned int *re_bitset_ptr_t;
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#define bitset_set(set,i) (set[i / UINT_BITS] |= 1 << i % UINT_BITS)
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#define bitset_clear(set,i) (set[i / UINT_BITS] &= ~(1 << i % UINT_BITS))
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#define bitset_contain(set,i) (set[i / UINT_BITS] & (1 << i % UINT_BITS))
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#define bitset_empty(set) memset (set, 0, sizeof (unsigned int) * BITSET_UINTS)
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#define bitset_set_all(set) \
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memset (set, 255, sizeof (unsigned int) * BITSET_UINTS)
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#define bitset_copy(dest,src) \
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memcpy (dest, src, sizeof (unsigned int) * BITSET_UINTS)
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static inline void bitset_not (bitset set);
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static inline void bitset_merge (bitset dest, const bitset src);
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static inline void bitset_not_merge (bitset dest, const bitset src);
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#define PREV_WORD_CONSTRAINT 0x0001
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#define PREV_NOTWORD_CONSTRAINT 0x0002
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#define NEXT_WORD_CONSTRAINT 0x0004
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#define NEXT_NOTWORD_CONSTRAINT 0x0008
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#define PREV_NEWLINE_CONSTRAINT 0x0010
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#define NEXT_NEWLINE_CONSTRAINT 0x0020
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#define PREV_BEGBUF_CONSTRAINT 0x0040
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#define NEXT_ENDBUF_CONSTRAINT 0x0080
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#define DUMMY_CONSTRAINT 0x0100
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typedef enum
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{
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INSIDE_WORD = PREV_WORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
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WORD_FIRST = PREV_NOTWORD_CONSTRAINT | NEXT_WORD_CONSTRAINT,
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WORD_LAST = PREV_WORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT,
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LINE_FIRST = PREV_NEWLINE_CONSTRAINT,
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LINE_LAST = NEXT_NEWLINE_CONSTRAINT,
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BUF_FIRST = PREV_BEGBUF_CONSTRAINT,
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BUF_LAST = NEXT_ENDBUF_CONSTRAINT,
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WORD_DELIM = DUMMY_CONSTRAINT
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} re_context_type;
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typedef struct
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{
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int alloc;
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int nelem;
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int *elems;
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} re_node_set;
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typedef enum
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{
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NON_TYPE = 0,
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/* Token type, these are used only by token. */
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OP_OPEN_SUBEXP,
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OP_CLOSE_SUBEXP,
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OP_OPEN_BRACKET,
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OP_CLOSE_BRACKET,
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OP_CHARSET_RANGE,
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OP_OPEN_DUP_NUM,
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OP_CLOSE_DUP_NUM,
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OP_NON_MATCH_LIST,
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OP_OPEN_COLL_ELEM,
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OP_CLOSE_COLL_ELEM,
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OP_OPEN_EQUIV_CLASS,
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OP_CLOSE_EQUIV_CLASS,
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OP_OPEN_CHAR_CLASS,
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OP_CLOSE_CHAR_CLASS,
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OP_WORD,
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OP_NOTWORD,
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BACK_SLASH,
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/* Tree type, these are used only by tree. */
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CONCAT,
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ALT,
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SUBEXP,
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SIMPLE_BRACKET,
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COMPLEX_BRACKET,
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/* Node type, These are used by token, node, tree. */
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OP_PERIOD,
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CHARACTER,
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END_OF_RE,
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OP_ALT,
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OP_DUP_ASTERISK,
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OP_DUP_PLUS,
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OP_DUP_QUESTION,
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OP_BACK_REF,
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ANCHOR,
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OP_CONTEXT_NODE,
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/* Dummy marker. */
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END_OF_RE_TOKEN_T
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} re_token_type_t;
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typedef struct
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{
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/* If this character set is the non-matching list. */
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unsigned int non_match : 1;
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/* Multibyte characters. */
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wchar_t *mbchars;
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int nmbchars;
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/* Collating symbols. */
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#ifdef _LIBC
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int32_t *coll_syms;
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#endif
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int ncoll_syms;
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/* Equivalence classes. */
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#ifdef _LIBC
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int32_t *equiv_classes;
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#endif
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int nequiv_classes;
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/* Range expressions. */
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#ifdef _LIBC
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uint32_t *range_starts;
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uint32_t *range_ends;
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#endif
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int nranges;
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/* Character classes. */
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wctype_t *char_classes;
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int nchar_classes;
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} re_charset_t;
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typedef struct
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{
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re_token_type_t type;
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union
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{
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unsigned char c; /* for CHARACTER */
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re_bitset_ptr_t sbcset; /* for SIMPLE_BRACKET */
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re_charset_t *mbcset; /* for COMPLEX_BRACKET */
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int idx; /* for BACK_REF */
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re_context_type ctx_type; /* for ANCHOR */
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struct
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{
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int entity; /* for OP_CONTEXT_NODE, index of the entity */
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re_node_set *bkref_eclosure;
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} *ctx_info;
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} opr;
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unsigned int constraint : 10; /* context constraint */
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unsigned int duplicated : 1;
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#ifdef RE_ENABLE_I18N
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unsigned int mb_partial : 1;
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#endif
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} re_token_t;
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#define IS_EPSILON_NODE(type) \
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((type) == OP_ALT || (type) == OP_DUP_ASTERISK || (type) == OP_DUP_PLUS || \
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(type) == OP_DUP_QUESTION || (type) == ANCHOR)
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#define ACCEPT_MB_NODE(type) \
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((type) == COMPLEX_BRACKET || (type) == OP_PERIOD)
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struct re_string_t
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{
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/* Store the multibyte string. In case of "case insensitive mode" like
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REG_ICASE, upper cases of the string are stored. */
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const unsigned char *mbs;
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/* Store the case sensitive multibyte string. In case of
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"case insensitive mode", the original string are stored,
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otherwise MBS_CASE points the same address that MBS points. */
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const unsigned char *mbs_case;
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int cur_idx;
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int len;
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#ifdef RE_ENABLE_I18N
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/* Store the wide character string which is corresponding to MBS. */
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wchar_t *wcs;
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#endif
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/* 1 if mbs is allocated by regex library. */
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unsigned int mbs_alloc : 1;
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/* 1 if mbs_case is allocated by regex library. */
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unsigned int mbs_case_alloc : 1;
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};
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typedef struct re_string_t re_string_t;
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static reg_errcode_t re_string_construct (re_string_t *pstr,
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const unsigned char *str, int len,
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RE_TRANSLATE_TYPE trans);
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static reg_errcode_t re_string_construct_toupper (re_string_t *pstr,
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const unsigned char *str,
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int len,
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RE_TRANSLATE_TYPE trans);
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static void re_string_destruct (re_string_t *pstr);
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#ifdef RE_ENABLE_I18N
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static int re_string_elem_size_at (const re_string_t *pstr, int idx);
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static inline int re_string_char_size_at (const re_string_t *pstr, int idx);
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static inline wint_t re_string_wchar_at (const re_string_t *pstr, int idx);
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#endif /* RE_ENABLE_I18N */
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static unsigned int re_string_context_at (const re_string_t *input, int idx,
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int eflags, int newline_anchor);
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#define re_string_peek_byte(pstr, offset) \
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((pstr)->mbs[(pstr)->cur_idx + offset])
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#define re_string_peek_byte_case(pstr, offset) \
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((pstr)->mbs_case[(pstr)->cur_idx + offset])
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#define re_string_fetch_byte(pstr) \
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((pstr)->mbs[(pstr)->cur_idx++])
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#define re_string_fetch_byte_case(pstr) \
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((pstr)->mbs_case[(pstr)->cur_idx++])
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#define re_string_first_byte(pstr, idx) \
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((idx) == (pstr)->len || (pstr)->wcs[idx] != WEOF)
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#define re_string_is_single_byte_char(pstr, idx) \
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((pstr)->wcs[idx] != WEOF && ((pstr)->len == (idx) \
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|| (pstr)->wcs[(idx) + 1] != WEOF))
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#define re_string_eoi(pstr) ((pstr)->len == (pstr)->cur_idx)
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#define re_string_cur_idx(pstr) ((pstr)->cur_idx)
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#define re_string_get_buffer(pstr) ((pstr)->mbs)
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#define re_string_length(pstr) ((pstr)->len)
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#define re_string_byte_at(pstr,idx) \
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((pstr)->mbs[idx])
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#define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx))
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#define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx))
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#define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t)))
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#define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t)))
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#define re_free(p) free (p)
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struct bin_tree_t
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{
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struct bin_tree_t *parent;
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struct bin_tree_t *left;
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struct bin_tree_t *right;
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/* `node_idx' is the index in dfa->nodes, if `type' == 0.
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Otherwise `type' indicate the type of this node. */
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re_token_type_t type;
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int node_idx;
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int first;
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int next;
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re_node_set eclosure;
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};
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typedef struct bin_tree_t bin_tree_t;
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struct re_backref_cache_entry
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{
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int node;
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int from;
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int to;
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int flag;
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};
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typedef struct
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{
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int eflags;
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int match_first;
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int match_last;
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int state_log_top;
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/* Back reference cache. */
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int nbkref_ents;
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int abkref_ents;
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struct re_backref_cache_entry *bkref_ents;
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int max_bkref_len;
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} re_match_context_t;
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#define CONTEXT_WORD 1
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#define CONTEXT_NEWLINE (CONTEXT_WORD << 1)
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#define CONTEXT_BEGBUF (CONTEXT_NEWLINE << 1)
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#define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1)
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#define IS_WORD_CONTEXT(c) ((c) & CONTEXT_WORD)
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#define IS_NEWLINE_CONTEXT(c) ((c) & CONTEXT_NEWLINE)
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#define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF)
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#define IS_ENDBUF_CONTEXT(c) ((c) & CONTEXT_ENDBUF)
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#define IS_ORDINARY_CONTEXT(c) ((c) == 0)
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#define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_')
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#define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR)
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#define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \
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((((constraint) & PREV_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
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|| ((constraint & PREV_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
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|| ((constraint & PREV_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context))\
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|| ((constraint & PREV_BEGBUF_CONSTRAINT) && !IS_BEGBUF_CONTEXT (context)))
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#define NOT_SATISFY_NEXT_CONSTRAINT(constraint,context) \
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((((constraint) & NEXT_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \
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|| (((constraint) & NEXT_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \
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|| (((constraint) & NEXT_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context)) \
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|| (((constraint) & NEXT_ENDBUF_CONSTRAINT) && !IS_ENDBUF_CONTEXT (context)))
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struct re_dfastate_t
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{
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unsigned int hash;
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re_node_set nodes;
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re_node_set *entrance_nodes;
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struct re_dfastate_t **trtable;
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struct re_dfastate_t **trtable_search;
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/* If this state is a special state.
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A state is a special state if the state is the halt state, or
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a anchor. */
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unsigned int context : 2;
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unsigned int halt : 1;
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/* If this state can accept `multi byte'.
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Note that we refer to multibyte characters, and multi character
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collating elements as `multi byte'. */
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unsigned int accept_mb : 1;
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/* If this state has backreference node(s). */
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unsigned int has_backref : 1;
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unsigned int has_constraint : 1;
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};
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typedef struct re_dfastate_t re_dfastate_t;
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typedef struct
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{
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/* start <= node < end */
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int start;
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int end;
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} re_subexp_t;
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struct re_state_table_entry
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{
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int num;
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int alloc;
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union
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{
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re_dfastate_t *state;
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re_dfastate_t **array;
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} entry;
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};
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struct re_dfa_t
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{
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re_bitset_ptr_t word_char;
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/* number of subexpressions `re_nsub' is in regex_t. */
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int subexps_alloc;
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re_subexp_t *subexps;
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re_token_t *nodes;
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int nodes_alloc;
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int nodes_len;
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bin_tree_t *str_tree;
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int *firsts;
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int *nexts;
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re_node_set *edests;
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re_node_set *eclosures;
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re_node_set *inveclosures;
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struct re_state_table_entry *state_table;
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unsigned int state_hash_mask;
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re_dfastate_t *init_state;
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re_dfastate_t *init_state_word;
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re_dfastate_t *init_state_nl;
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re_dfastate_t *init_state_begbuf;
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int states_alloc;
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int init_node;
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int nbackref; /* The number of backreference in this dfa. */
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/* If this dfa has "multibyte node", which is a backreference or
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a node which can accept multibyte character or multi character
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collating element. */
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unsigned int has_mb_node : 1;
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};
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typedef struct re_dfa_t re_dfa_t;
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static reg_errcode_t re_node_set_alloc (re_node_set *set, int size);
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static reg_errcode_t re_node_set_init_1 (re_node_set *set, int elem);
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static reg_errcode_t re_node_set_init_2 (re_node_set *set, int elem1,
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int elem2);
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#define re_node_set_init_empty(set) memset (set, '\0', sizeof (re_node_set))
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static reg_errcode_t re_node_set_init_copy (re_node_set *dest,
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const re_node_set *src);
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static reg_errcode_t re_node_set_intersect (re_node_set *dest,
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const re_node_set *src1,
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const re_node_set *src2);
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static reg_errcode_t re_node_set_add_intersect (re_node_set *dest,
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const re_node_set *src1,
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const re_node_set *src2);
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static reg_errcode_t re_node_set_init_union (re_node_set *dest,
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const re_node_set *src1,
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const re_node_set *src2);
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static reg_errcode_t re_node_set_merge (re_node_set *dest,
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const re_node_set *src);
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static int re_node_set_insert (re_node_set *set, int elem);
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static int re_node_set_compare (const re_node_set *set1,
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const re_node_set *set2);
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static int re_node_set_contains (const re_node_set *set, int elem);
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static void re_node_set_remove_at (re_node_set *set, int idx);
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#define re_node_set_empty(p) ((p)->nelem = 0)
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#define re_node_set_free(set) re_free ((set)->elems)
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static int re_dfa_add_node (re_dfa_t *dfa, re_token_t token, int mode);
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static re_dfastate_t *re_acquire_state (reg_errcode_t *err, re_dfa_t *dfa,
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const re_node_set *nodes);
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static re_dfastate_t *re_acquire_state_context (reg_errcode_t *err,
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re_dfa_t *dfa,
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const re_node_set *nodes,
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unsigned int context);
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typedef enum
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{
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SB_CHAR,
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MB_CHAR,
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EQUIV_CLASS,
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COLL_SYM,
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CHAR_CLASS
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} bracket_elem_type;
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typedef struct
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{
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bracket_elem_type type;
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union
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{
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unsigned char ch;
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unsigned char *name;
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wchar_t wch;
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} opr;
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} bracket_elem_t;
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/* Inline functions for bitset operation. */
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static inline void
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bitset_not (set)
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bitset set;
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{
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int bitset_i;
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for (bitset_i = 0; bitset_i < BITSET_UINTS; ++bitset_i)
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set[bitset_i] = ~set[bitset_i];
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}
|
||
|
||
static inline void
|
||
bitset_merge (dest, src)
|
||
bitset dest;
|
||
const bitset src;
|
||
{
|
||
int bitset_i;
|
||
for (bitset_i = 0; bitset_i < BITSET_UINTS; ++bitset_i)
|
||
dest[bitset_i] |= src[bitset_i];
|
||
}
|
||
|
||
static inline void
|
||
bitset_not_merge (dest, src)
|
||
bitset dest;
|
||
const bitset src;
|
||
{
|
||
int i;
|
||
for (i = 0; i < BITSET_UINTS; ++i)
|
||
dest[i] |= ~src[i];
|
||
}
|
||
|
||
#ifdef RE_ENABLE_I18N
|
||
/* Inline functions for re_string. */
|
||
static inline int
|
||
re_string_char_size_at (pstr, idx)
|
||
const re_string_t *pstr;
|
||
int idx;
|
||
{
|
||
int byte_idx;
|
||
if (MB_CUR_MAX == 1)
|
||
return 1;
|
||
for (byte_idx = 1; idx + byte_idx < pstr->len; ++byte_idx)
|
||
if (pstr->wcs[idx + byte_idx] != WEOF)
|
||
break;
|
||
return byte_idx;
|
||
}
|
||
|
||
static inline wint_t
|
||
re_string_wchar_at (pstr, idx)
|
||
const re_string_t *pstr;
|
||
int idx;
|
||
{
|
||
if (MB_CUR_MAX == 1)
|
||
return (wint_t) pstr->mbs[idx];
|
||
return (wint_t) pstr->wcs[idx];
|
||
}
|
||
|
||
static int
|
||
re_string_elem_size_at (pstr, idx)
|
||
const re_string_t *pstr;
|
||
int idx;
|
||
{
|
||
#ifdef _LIBC
|
||
const unsigned char *p;
|
||
const char *extra;
|
||
const int32_t *table, *indirect;
|
||
int32_t tmp;
|
||
# include <locale/weight.h>
|
||
uint_fast32_t nrules = _NL_CURRENT_WORD (LC_COLLATE, _NL_COLLATE_NRULES);
|
||
|
||
if (nrules != 0)
|
||
{
|
||
table = (const int32_t *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_TABLEMB);
|
||
extra = (const char *) _NL_CURRENT (LC_COLLATE, _NL_COLLATE_EXTRAMB);
|
||
indirect = (const int32_t *) _NL_CURRENT (LC_COLLATE,
|
||
_NL_COLLATE_INDIRECTMB);
|
||
p = pstr->mbs + idx;
|
||
tmp = findidx (&p);
|
||
return p - (const unsigned char *) pstr->mbs - idx;
|
||
}
|
||
else
|
||
#endif /* _LIBC */
|
||
return 1;
|
||
}
|
||
#endif /* RE_ENABLE_I18N */
|
||
|
||
#endif /* _REGEX_INTERNAL_H */
|