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Diffstat (limited to 'util/regex_internal.h')
| -rw-r--r-- | util/regex_internal.h | 643 |
1 files changed, 643 insertions, 0 deletions
diff --git a/util/regex_internal.h b/util/regex_internal.h new file mode 100644 index 0000000..679bea1 --- /dev/null +++ b/util/regex_internal.h @@ -0,0 +1,643 @@ +/* Extended regular expression matching and search library. + Copyright (C) 2002 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02110-1301 USA. */ + +#ifndef _REGEX_INTERNAL_H +#define _REGEX_INTERNAL_H 1 + +/* Number of bits in a byte. */ +#define BYTE_BITS 8 +/* Number of single byte character. */ +#define SBC_MAX 256 + +#define COLL_ELEM_LEN_MAX 8 + +/* The character which represents newline. */ +#define NEWLINE_CHAR '\n' + +/* Rename to standard API for using out of glibc. */ +#ifndef _LIBC +# define __wctype wctype +# define __iswctype iswctype +# define __btowc btowc +# define __mempcpy memcpy +# define attribute_hidden +#endif /* not _LIBC */ + +extern const char __re_error_msgid[] attribute_hidden; +extern const size_t __re_error_msgid_idx[] attribute_hidden; + +/* Number of bits in an unsinged int. */ +#define UINT_BITS (sizeof (unsigned int) * BYTE_BITS) +/* Number of unsigned int in an bit_set. */ +#define BITSET_UINTS ((SBC_MAX + UINT_BITS - 1) / UINT_BITS) +typedef unsigned int bitset[BITSET_UINTS]; +typedef unsigned int *re_bitset_ptr_t; + +#define bitset_set(set,i) (set[i / UINT_BITS] |= 1 << i % UINT_BITS) +#define bitset_clear(set,i) (set[i / UINT_BITS] &= ~(1 << i % UINT_BITS)) +#define bitset_contain(set,i) (set[i / UINT_BITS] & (1 << i % UINT_BITS)) +#define bitset_empty(set) memset (set, 0, sizeof (unsigned int) * BITSET_UINTS) +#define bitset_set_all(set) \ + memset (set, 255, sizeof (unsigned int) * BITSET_UINTS) +#define bitset_copy(dest,src) \ + memcpy (dest, src, sizeof (unsigned int) * BITSET_UINTS) +static inline void bitset_not (bitset set); +static inline void bitset_merge (bitset dest, const bitset src); +#if 0 /* gnupg */ +static inline void bitset_not_merge (bitset dest, const bitset src); +#endif + +#define PREV_WORD_CONSTRAINT 0x0001 +#define PREV_NOTWORD_CONSTRAINT 0x0002 +#define NEXT_WORD_CONSTRAINT 0x0004 +#define NEXT_NOTWORD_CONSTRAINT 0x0008 +#define PREV_NEWLINE_CONSTRAINT 0x0010 +#define NEXT_NEWLINE_CONSTRAINT 0x0020 +#define PREV_BEGBUF_CONSTRAINT 0x0040 +#define NEXT_ENDBUF_CONSTRAINT 0x0080 +#define DUMMY_CONSTRAINT 0x0100 + +typedef enum +{ + INSIDE_WORD = PREV_WORD_CONSTRAINT | NEXT_WORD_CONSTRAINT, + WORD_FIRST = PREV_NOTWORD_CONSTRAINT | NEXT_WORD_CONSTRAINT, + WORD_LAST = PREV_WORD_CONSTRAINT | NEXT_NOTWORD_CONSTRAINT, + LINE_FIRST = PREV_NEWLINE_CONSTRAINT, + LINE_LAST = NEXT_NEWLINE_CONSTRAINT, + BUF_FIRST = PREV_BEGBUF_CONSTRAINT, + BUF_LAST = NEXT_ENDBUF_CONSTRAINT, + WORD_DELIM = DUMMY_CONSTRAINT +} re_context_type; + +typedef struct +{ + int alloc; + int nelem; + int *elems; +} re_node_set; + +typedef enum +{ + NON_TYPE = 0, + + /* Token type, these are used only by token. */ + OP_OPEN_BRACKET, + OP_CLOSE_BRACKET, + OP_CHARSET_RANGE, + OP_OPEN_DUP_NUM, + OP_CLOSE_DUP_NUM, + OP_NON_MATCH_LIST, + OP_OPEN_COLL_ELEM, + OP_CLOSE_COLL_ELEM, + OP_OPEN_EQUIV_CLASS, + OP_CLOSE_EQUIV_CLASS, + OP_OPEN_CHAR_CLASS, + OP_CLOSE_CHAR_CLASS, + OP_WORD, + OP_NOTWORD, + BACK_SLASH, + + /* Tree type, these are used only by tree. */ + CONCAT, + ALT, + SUBEXP, + SIMPLE_BRACKET, +#ifdef RE_ENABLE_I18N + COMPLEX_BRACKET, +#endif /* RE_ENABLE_I18N */ + + /* Node type, These are used by token, node, tree. */ + OP_OPEN_SUBEXP, + OP_CLOSE_SUBEXP, + OP_PERIOD, + CHARACTER, + END_OF_RE, + OP_ALT, + OP_DUP_ASTERISK, + OP_DUP_PLUS, + OP_DUP_QUESTION, + OP_BACK_REF, + ANCHOR, + OP_CONTEXT_NODE, + + /* Dummy marker. */ + END_OF_RE_TOKEN_T +} re_token_type_t; + +#ifdef RE_ENABLE_I18N +typedef struct +{ + /* Multibyte characters. */ + wchar_t *mbchars; + + /* Collating symbols. */ +# ifdef _LIBC + int32_t *coll_syms; +# endif + + /* Equivalence classes. */ +# ifdef _LIBC + int32_t *equiv_classes; +# endif + + /* Range expressions. */ +# ifdef _LIBC + uint32_t *range_starts; + uint32_t *range_ends; +# else /* not _LIBC */ + wchar_t *range_starts; + wchar_t *range_ends; +# endif /* not _LIBC */ + + /* Character classes. */ + wctype_t *char_classes; + + /* If this character set is the non-matching list. */ + unsigned int non_match : 1; + + /* # of multibyte characters. */ + int nmbchars; + + /* # of collating symbols. */ + int ncoll_syms; + + /* # of equivalence classes. */ + int nequiv_classes; + + /* # of range expressions. */ + int nranges; + + /* # of character classes. */ + int nchar_classes; +} re_charset_t; +#endif /* RE_ENABLE_I18N */ + +typedef struct +{ + union + { + unsigned char c; /* for CHARACTER */ + re_bitset_ptr_t sbcset; /* for SIMPLE_BRACKET */ +#ifdef RE_ENABLE_I18N + re_charset_t *mbcset; /* for COMPLEX_BRACKET */ +#endif /* RE_ENABLE_I18N */ + int idx; /* for BACK_REF */ + re_context_type ctx_type; /* for ANCHOR */ + struct + { + int entity; /* for OP_CONTEXT_NODE, index of the entity */ + re_node_set *bkref_eclosure; + } *ctx_info; + } opr; +#if __GNUC__ >= 2 + re_token_type_t type : 8; +#else + re_token_type_t type; +#endif + unsigned int constraint : 10; /* context constraint */ + unsigned int duplicated : 1; +#ifdef RE_ENABLE_I18N + unsigned int mb_partial : 1; +#endif +} re_token_t; + +#define IS_EPSILON_NODE(type) \ + ((type) == OP_ALT || (type) == OP_DUP_ASTERISK || (type) == OP_DUP_PLUS \ + || (type) == OP_DUP_QUESTION || (type) == ANCHOR \ + || (type) == OP_OPEN_SUBEXP || (type) == OP_CLOSE_SUBEXP) + +#define ACCEPT_MB_NODE(type) \ + ((type) == COMPLEX_BRACKET || (type) == OP_PERIOD) + +struct re_string_t +{ + /* Indicate the raw buffer which is the original string passed as an + argument of regexec(), re_search(), etc.. */ + const unsigned char *raw_mbs; + /* Store the multibyte string. In case of "case insensitive mode" like + REG_ICASE, upper cases of the string are stored, otherwise MBS points + the same address that RAW_MBS points. */ + unsigned char *mbs; + /* Store the case sensitive multibyte string. In case of + "case insensitive mode", the original string are stored, + otherwise MBS_CASE points the same address that MBS points. */ + unsigned char *mbs_case; +#ifdef RE_ENABLE_I18N + /* Store the wide character string which is corresponding to MBS. */ + wint_t *wcs; + mbstate_t cur_state; +#endif + /* Index in RAW_MBS. Each character mbs[i] corresponds to + raw_mbs[raw_mbs_idx + i]. */ + int raw_mbs_idx; + /* The length of the valid characters in the buffers. */ + int valid_len; + /* The length of the buffers MBS, MBS_CASE, and WCS. */ + int bufs_len; + /* The index in MBS, which is updated by re_string_fetch_byte. */ + int cur_idx; + /* This is length_of_RAW_MBS - RAW_MBS_IDX. */ + int len; + /* End of the buffer may be shorter than its length in the cases such + as re_match_2, re_search_2. Then, we use STOP for end of the buffer + instead of LEN. */ + int stop; + + /* The context of mbs[0]. We store the context independently, since + the context of mbs[0] may be different from raw_mbs[0], which is + the beginning of the input string. */ + unsigned int tip_context; + /* The translation passed as a part of an argument of re_compile_pattern. */ + RE_TRANSLATE_TYPE trans; + /* 1 if REG_ICASE. */ + unsigned int icase : 1; +}; +typedef struct re_string_t re_string_t; +/* In case of REG_ICASE, we allocate the buffer dynamically for mbs. */ +#define MBS_ALLOCATED(pstr) (pstr->icase) +/* In case that we need translation, we allocate the buffer dynamically + for mbs_case. Note that mbs == mbs_case if not REG_ICASE. */ +#define MBS_CASE_ALLOCATED(pstr) (pstr->trans != NULL) + + +static reg_errcode_t re_string_allocate (re_string_t *pstr, const char *str, + int len, int init_len, + RE_TRANSLATE_TYPE trans, int icase); +static reg_errcode_t re_string_construct (re_string_t *pstr, const char *str, + int len, RE_TRANSLATE_TYPE trans, + int icase); +static reg_errcode_t re_string_reconstruct (re_string_t *pstr, int idx, + int eflags, int newline); +static reg_errcode_t re_string_realloc_buffers (re_string_t *pstr, + int new_buf_len); +#ifdef RE_ENABLE_I18N +static void build_wcs_buffer (re_string_t *pstr); +static void build_wcs_upper_buffer (re_string_t *pstr); +#endif /* RE_ENABLE_I18N */ +static void build_upper_buffer (re_string_t *pstr); +static void re_string_translate_buffer (re_string_t *pstr); +static void re_string_destruct (re_string_t *pstr); +#ifdef RE_ENABLE_I18N +static int re_string_elem_size_at (const re_string_t *pstr, int idx); +static inline int re_string_char_size_at (const re_string_t *pstr, int idx); +static inline wint_t re_string_wchar_at (const re_string_t *pstr, int idx); +#endif /* RE_ENABLE_I18N */ +static unsigned int re_string_context_at (const re_string_t *input, int idx, + int eflags, int newline_anchor); +#define re_string_peek_byte(pstr, offset) \ + ((pstr)->mbs[(pstr)->cur_idx + offset]) +#define re_string_peek_byte_case(pstr, offset) \ + ((pstr)->mbs_case[(pstr)->cur_idx + offset]) +#define re_string_fetch_byte(pstr) \ + ((pstr)->mbs[(pstr)->cur_idx++]) +#define re_string_fetch_byte_case(pstr) \ + ((pstr)->mbs_case[(pstr)->cur_idx++]) +#define re_string_first_byte(pstr, idx) \ + ((idx) == (pstr)->len || (pstr)->wcs[idx] != WEOF) +#define re_string_is_single_byte_char(pstr, idx) \ + ((pstr)->wcs[idx] != WEOF && ((pstr)->len == (idx) \ + || (pstr)->wcs[(idx) + 1] != WEOF)) +#define re_string_eoi(pstr) ((pstr)->stop <= (pstr)->cur_idx) +#define re_string_cur_idx(pstr) ((pstr)->cur_idx) +#define re_string_get_buffer(pstr) ((pstr)->mbs) +#define re_string_length(pstr) ((pstr)->len) +#define re_string_byte_at(pstr,idx) ((pstr)->mbs[idx]) +#define re_string_skip_bytes(pstr,idx) ((pstr)->cur_idx += (idx)) +#define re_string_set_index(pstr,idx) ((pstr)->cur_idx = (idx)) + +#define re_malloc(t,n) ((t *) malloc ((n) * sizeof (t))) +#define re_realloc(p,t,n) ((t *) realloc (p, (n) * sizeof (t))) +#define re_free(p) free (p) + +struct bin_tree_t +{ + struct bin_tree_t *parent; + struct bin_tree_t *left; + struct bin_tree_t *right; + + /* `node_idx' is the index in dfa->nodes, if `type' == 0. + Otherwise `type' indicate the type of this node. */ + re_token_type_t type; + int node_idx; + + int first; + int next; + re_node_set eclosure; +}; +typedef struct bin_tree_t bin_tree_t; + + +#define CONTEXT_WORD 1 +#define CONTEXT_NEWLINE (CONTEXT_WORD << 1) +#define CONTEXT_BEGBUF (CONTEXT_NEWLINE << 1) +#define CONTEXT_ENDBUF (CONTEXT_BEGBUF << 1) + +#define IS_WORD_CONTEXT(c) ((c) & CONTEXT_WORD) +#define IS_NEWLINE_CONTEXT(c) ((c) & CONTEXT_NEWLINE) +#define IS_BEGBUF_CONTEXT(c) ((c) & CONTEXT_BEGBUF) +#define IS_ENDBUF_CONTEXT(c) ((c) & CONTEXT_ENDBUF) +#define IS_ORDINARY_CONTEXT(c) ((c) == 0) + +#define IS_WORD_CHAR(ch) (isalnum (ch) || (ch) == '_') +#define IS_NEWLINE(ch) ((ch) == NEWLINE_CHAR) + +#define NOT_SATISFY_PREV_CONSTRAINT(constraint,context) \ + ((((constraint) & PREV_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \ + || ((constraint & PREV_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \ + || ((constraint & PREV_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context))\ + || ((constraint & PREV_BEGBUF_CONSTRAINT) && !IS_BEGBUF_CONTEXT (context))) + +#define NOT_SATISFY_NEXT_CONSTRAINT(constraint,context) \ + ((((constraint) & NEXT_WORD_CONSTRAINT) && !IS_WORD_CONTEXT (context)) \ + || (((constraint) & NEXT_NOTWORD_CONSTRAINT) && IS_WORD_CONTEXT (context)) \ + || (((constraint) & NEXT_NEWLINE_CONSTRAINT) && !IS_NEWLINE_CONTEXT (context)) \ + || (((constraint) & NEXT_ENDBUF_CONSTRAINT) && !IS_ENDBUF_CONTEXT (context))) + +struct re_dfastate_t +{ + unsigned int hash; + re_node_set nodes; + re_node_set *entrance_nodes; + struct re_dfastate_t **trtable; + struct re_dfastate_t **trtable_search; + /* If this state is a special state. + A state is a special state if the state is the halt state, or + a anchor. */ + unsigned int context : 2; + unsigned int halt : 1; + /* If this state can accept `multi byte'. + Note that we refer to multibyte characters, and multi character + collating elements as `multi byte'. */ + unsigned int accept_mb : 1; + /* If this state has backreference node(s). */ + unsigned int has_backref : 1; + unsigned int has_constraint : 1; +}; +typedef struct re_dfastate_t re_dfastate_t; + +typedef struct +{ + /* start <= node < end */ + int start; + int end; +} re_subexp_t; + +struct re_state_table_entry +{ + int num; + int alloc; + re_dfastate_t **array; +}; + +struct re_backref_cache_entry +{ + int node; + int str_idx; + int subexp_from; + int subexp_to; + int flag; +}; + +typedef struct +{ + /* EFLAGS of the argument of regexec. */ + int eflags; + /* Where the matching ends. */ + int match_last; + int last_node; + /* The string object corresponding to the input string. */ + re_string_t *input; + /* The state log used by the matcher. */ + re_dfastate_t **state_log; + int state_log_top; + /* Back reference cache. */ + int nbkref_ents; + int abkref_ents; + struct re_backref_cache_entry *bkref_ents; + int max_mb_elem_len; +} re_match_context_t; + +typedef struct +{ + int cur_bkref; + int cls_subexp_idx; + + re_dfastate_t **sifted_states; + re_dfastate_t **limited_states; + + re_node_set limits; + + int last_node; + int last_str_idx; + int check_subexp; +} re_sift_context_t; + +struct re_fail_stack_ent_t +{ + int idx; + int node; + regmatch_t *regs; + re_node_set eps_via_nodes; +}; + +struct re_fail_stack_t +{ + int num; + int alloc; + struct re_fail_stack_ent_t *stack; +}; + +struct re_dfa_t +{ + re_bitset_ptr_t word_char; + + /* number of subexpressions `re_nsub' is in regex_t. */ + int subexps_alloc; + re_subexp_t *subexps; + + re_token_t *nodes; + int nodes_alloc; + int nodes_len; + bin_tree_t *str_tree; + int *firsts; + int *nexts; + re_node_set *edests; + re_node_set *eclosures; + re_node_set *inveclosures; + struct re_state_table_entry *state_table; + unsigned int state_hash_mask; + re_dfastate_t *init_state; + re_dfastate_t *init_state_word; + re_dfastate_t *init_state_nl; + re_dfastate_t *init_state_begbuf; + int states_alloc; + int init_node; + int nbackref; /* The number of backreference in this dfa. */ + /* If this dfa has "multibyte node", which is a backreference or + a node which can accept multibyte character or multi character + collating element. */ +#ifdef DEBUG + char* re_str; +#endif + unsigned int has_plural_match : 1; + unsigned int has_mb_node : 1; +}; +typedef struct re_dfa_t re_dfa_t; + +static reg_errcode_t re_node_set_alloc (re_node_set *set, int size); +static reg_errcode_t re_node_set_init_1 (re_node_set *set, int elem); +static reg_errcode_t re_node_set_init_2 (re_node_set *set, int elem1, + int elem2); +#define re_node_set_init_empty(set) memset (set, '\0', sizeof (re_node_set)) +static reg_errcode_t re_node_set_init_copy (re_node_set *dest, + const re_node_set *src); +static reg_errcode_t re_node_set_add_intersect (re_node_set *dest, + const re_node_set *src1, + const re_node_set *src2); +static reg_errcode_t re_node_set_init_union (re_node_set *dest, + const re_node_set *src1, + const re_node_set *src2); +static reg_errcode_t re_node_set_merge (re_node_set *dest, + const re_node_set *src); +static int re_node_set_insert (re_node_set *set, int elem); +static int re_node_set_compare (const re_node_set *set1, + const re_node_set *set2); +static int re_node_set_contains (const re_node_set *set, int elem); +static void re_node_set_remove_at (re_node_set *set, int idx); +#define re_node_set_empty(p) ((p)->nelem = 0) +#define re_node_set_free(set) re_free ((set)->elems) +static int re_dfa_add_node (re_dfa_t *dfa, re_token_t token, int mode); +static re_dfastate_t *re_acquire_state (reg_errcode_t *err, re_dfa_t *dfa, + const re_node_set *nodes); +static re_dfastate_t *re_acquire_state_context (reg_errcode_t *err, + re_dfa_t *dfa, + const re_node_set *nodes, + unsigned int context); + + +typedef enum +{ + SB_CHAR, + MB_CHAR, + EQUIV_CLASS, + COLL_SYM, + CHAR_CLASS +} bracket_elem_type; + +typedef struct +{ + bracket_elem_type type; + union + { + unsigned char ch; + unsigned char *name; + wchar_t wch; + } opr; +} bracket_elem_t; + + +/* Inline functions for bitset operation. */ +static inline void +bitset_not (set) + bitset set; +{ + int bitset_i; + for (bitset_i = 0; bitset_i < BITSET_UINTS; ++bitset_i) + set[bitset_i] = ~set[bitset_i]; +} + +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]; +} + +#if 0 /* gnupg */ +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]; +} +#endif + +#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, *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 unsigned 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 - pstr->mbs - idx; + } + else +#endif /* _LIBC */ + return 1; +} +#endif /* RE_ENABLE_I18N */ + +#endif /* _REGEX_INTERNAL_H */ |