1264 lines
34 KiB
C
1264 lines
34 KiB
C
/* Extended regular expression matching and search library.
|
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Copyright (C) 2002, 2003 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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||
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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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static void re_string_construct_common (const char *str, int len,
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re_string_t *pstr,
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RE_TRANSLATE_TYPE trans, int icase);
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#ifdef RE_ENABLE_I18N
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static int re_string_skip_chars (re_string_t *pstr, int new_raw_idx,
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wint_t *last_wc);
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#endif /* RE_ENABLE_I18N */
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static re_dfastate_t *create_newstate_common (re_dfa_t *dfa,
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const re_node_set *nodes,
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unsigned int hash);
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static reg_errcode_t register_state (re_dfa_t *dfa, re_dfastate_t *newstate,
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unsigned int hash);
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static re_dfastate_t *create_ci_newstate (re_dfa_t *dfa,
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const re_node_set *nodes,
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unsigned int hash);
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static re_dfastate_t *create_cd_newstate (re_dfa_t *dfa,
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const re_node_set *nodes,
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unsigned int context,
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unsigned int hash);
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static unsigned int inline calc_state_hash (const re_node_set *nodes,
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unsigned int context);
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/* Functions for string operation. */
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/* This function allocate the buffers. It is necessary to call
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re_string_reconstruct before using the object. */
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static reg_errcode_t
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re_string_allocate (pstr, str, len, init_len, trans, icase)
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re_string_t *pstr;
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const char *str;
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int len, init_len, icase;
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RE_TRANSLATE_TYPE trans;
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{
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reg_errcode_t ret;
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int init_buf_len = (len + 1 < init_len) ? len + 1: init_len;
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re_string_construct_common (str, len, pstr, trans, icase);
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pstr->stop = pstr->len;
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ret = re_string_realloc_buffers (pstr, init_buf_len);
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if (BE (ret != REG_NOERROR, 0))
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return ret;
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pstr->mbs_case = (MBS_CASE_ALLOCATED (pstr) ? pstr->mbs_case
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: (unsigned char *) str);
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pstr->mbs = MBS_ALLOCATED (pstr) ? pstr->mbs : pstr->mbs_case;
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pstr->valid_len = (MBS_CASE_ALLOCATED (pstr) || MBS_ALLOCATED (pstr)
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|| MB_CUR_MAX > 1) ? pstr->valid_len : len;
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return REG_NOERROR;
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}
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/* This function allocate the buffers, and initialize them. */
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static reg_errcode_t
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re_string_construct (pstr, str, len, trans, icase)
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re_string_t *pstr;
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const char *str;
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int len, icase;
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RE_TRANSLATE_TYPE trans;
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{
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reg_errcode_t ret;
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re_string_construct_common (str, len, pstr, trans, icase);
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pstr->stop = pstr->len;
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/* Set 0 so that this function can initialize whole buffers. */
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pstr->valid_len = 0;
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if (len > 0)
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{
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ret = re_string_realloc_buffers (pstr, len + 1);
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if (BE (ret != REG_NOERROR, 0))
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return ret;
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}
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pstr->mbs_case = (MBS_CASE_ALLOCATED (pstr) ? pstr->mbs_case
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: (unsigned char *) str);
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pstr->mbs = MBS_ALLOCATED (pstr) ? pstr->mbs : pstr->mbs_case;
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if (icase)
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{
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#ifdef RE_ENABLE_I18N
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if (MB_CUR_MAX > 1)
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build_wcs_upper_buffer (pstr);
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else
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#endif /* RE_ENABLE_I18N */
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build_upper_buffer (pstr);
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}
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else
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{
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#ifdef RE_ENABLE_I18N
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if (MB_CUR_MAX > 1)
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build_wcs_buffer (pstr);
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else
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#endif /* RE_ENABLE_I18N */
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{
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if (trans != NULL)
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re_string_translate_buffer (pstr);
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else
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pstr->valid_len = len;
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}
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}
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/* Initialized whole buffers, then valid_len == bufs_len. */
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pstr->valid_len = pstr->bufs_len;
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return REG_NOERROR;
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}
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/* Helper functions for re_string_allocate, and re_string_construct. */
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static reg_errcode_t
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re_string_realloc_buffers (pstr, new_buf_len)
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re_string_t *pstr;
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int new_buf_len;
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{
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#ifdef RE_ENABLE_I18N
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if (MB_CUR_MAX > 1)
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{
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wint_t *new_array = re_realloc (pstr->wcs, wint_t, new_buf_len);
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if (BE (new_array == NULL, 0))
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return REG_ESPACE;
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pstr->wcs = new_array;
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}
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#endif /* RE_ENABLE_I18N */
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if (MBS_ALLOCATED (pstr))
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{
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unsigned char *new_array = re_realloc (pstr->mbs, unsigned char,
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new_buf_len);
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if (BE (new_array == NULL, 0))
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return REG_ESPACE;
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pstr->mbs = new_array;
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}
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if (MBS_CASE_ALLOCATED (pstr))
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{
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unsigned char *new_array = re_realloc (pstr->mbs_case, unsigned char,
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new_buf_len);
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if (BE (new_array == NULL, 0))
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return REG_ESPACE;
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pstr->mbs_case = new_array;
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if (!MBS_ALLOCATED (pstr))
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pstr->mbs = pstr->mbs_case;
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}
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pstr->bufs_len = new_buf_len;
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return REG_NOERROR;
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}
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static void
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re_string_construct_common (str, len, pstr, trans, icase)
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const char *str;
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int len;
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re_string_t *pstr;
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RE_TRANSLATE_TYPE trans;
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int icase;
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{
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memset (pstr, '\0', sizeof (re_string_t));
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pstr->raw_mbs = (const unsigned char *) str;
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pstr->len = len;
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pstr->trans = trans;
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pstr->icase = icase ? 1 : 0;
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}
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#ifdef RE_ENABLE_I18N
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/* Build wide character buffer PSTR->WCS.
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If the byte sequence of the string are:
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<mb1>(0), <mb1>(1), <mb2>(0), <mb2>(1), <sb3>
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Then wide character buffer will be:
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<wc1> , WEOF , <wc2> , WEOF , <wc3>
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We use WEOF for padding, they indicate that the position isn't
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a first byte of a multibyte character.
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Note that this function assumes PSTR->VALID_LEN elements are already
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built and starts from PSTR->VALID_LEN. */
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static void
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build_wcs_buffer (pstr)
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re_string_t *pstr;
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{
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mbstate_t prev_st;
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int byte_idx, end_idx, mbclen, remain_len;
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/* Build the buffers from pstr->valid_len to either pstr->len or
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pstr->bufs_len. */
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end_idx = (pstr->bufs_len > pstr->len)? pstr->len : pstr->bufs_len;
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for (byte_idx = pstr->valid_len; byte_idx < end_idx;)
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{
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wchar_t wc;
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remain_len = end_idx - byte_idx;
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prev_st = pstr->cur_state;
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mbclen = mbrtowc (&wc, ((const char *) pstr->raw_mbs + pstr->raw_mbs_idx
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+ byte_idx), remain_len, &pstr->cur_state);
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if (BE (mbclen == (size_t) -2, 0))
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{
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/* The buffer doesn't have enough space, finish to build. */
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pstr->cur_state = prev_st;
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break;
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}
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else if (BE (mbclen == (size_t) -1 || mbclen == 0, 0))
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{
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/* We treat these cases as a singlebyte character. */
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mbclen = 1;
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wc = (wchar_t) pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
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pstr->cur_state = prev_st;
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}
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/* Apply the translateion if we need. */
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if (pstr->trans != NULL && mbclen == 1)
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{
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int ch = pstr->trans[pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx]];
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pstr->mbs_case[byte_idx] = ch;
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}
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/* Write wide character and padding. */
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pstr->wcs[byte_idx++] = wc;
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/* Write paddings. */
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for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
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pstr->wcs[byte_idx++] = WEOF;
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}
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pstr->valid_len = byte_idx;
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}
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/* Build wide character buffer PSTR->WCS like build_wcs_buffer,
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but for REG_ICASE. */
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static void
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build_wcs_upper_buffer (pstr)
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re_string_t *pstr;
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{
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mbstate_t prev_st;
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int byte_idx, end_idx, mbclen, remain_len;
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/* Build the buffers from pstr->valid_len to either pstr->len or
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pstr->bufs_len. */
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end_idx = (pstr->bufs_len > pstr->len)? pstr->len : pstr->bufs_len;
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for (byte_idx = pstr->valid_len; byte_idx < end_idx;)
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{
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wchar_t wc;
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remain_len = end_idx - byte_idx;
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prev_st = pstr->cur_state;
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mbclen = mbrtowc (&wc, ((const char *) pstr->raw_mbs + pstr->raw_mbs_idx
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+ byte_idx), remain_len, &pstr->cur_state);
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if (BE (mbclen == (size_t) -2, 0))
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{
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/* The buffer doesn't have enough space, finish to build. */
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pstr->cur_state = prev_st;
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break;
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}
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else if (mbclen == 1 || mbclen == (size_t) -1 || mbclen == 0)
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{
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/* In case of a singlebyte character. */
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int ch = pstr->raw_mbs[pstr->raw_mbs_idx + byte_idx];
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/* Apply the translateion if we need. */
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if (pstr->trans != NULL && mbclen == 1)
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{
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ch = pstr->trans[ch];
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pstr->mbs_case[byte_idx] = ch;
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}
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pstr->wcs[byte_idx] = iswlower (wc) ? toupper (wc) : wc;
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pstr->mbs[byte_idx++] = islower (ch) ? toupper (ch) : ch;
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if (BE (mbclen == (size_t) -1, 0))
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pstr->cur_state = prev_st;
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}
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else /* mbclen > 1 */
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{
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if (iswlower (wc))
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wcrtomb ((char *) pstr->mbs + byte_idx, towupper (wc), &prev_st);
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else
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memcpy (pstr->mbs + byte_idx,
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pstr->raw_mbs + pstr->raw_mbs_idx + byte_idx, mbclen);
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pstr->wcs[byte_idx++] = iswlower (wc) ? toupper (wc) : wc;
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||
/* Write paddings. */
|
||
for (remain_len = byte_idx + mbclen - 1; byte_idx < remain_len ;)
|
||
pstr->wcs[byte_idx++] = WEOF;
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||
}
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||
}
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pstr->valid_len = byte_idx;
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||
}
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/* Skip characters until the index becomes greater than NEW_RAW_IDX.
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Return the index. */
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||
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static int
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re_string_skip_chars (pstr, new_raw_idx, last_wc)
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re_string_t *pstr;
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int new_raw_idx;
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wint_t *last_wc;
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||
{
|
||
mbstate_t prev_st;
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||
int rawbuf_idx, mbclen;
|
||
wchar_t wc = 0;
|
||
|
||
/* Skip the characters which are not necessary to check. */
|
||
for (rawbuf_idx = pstr->raw_mbs_idx + pstr->valid_len;
|
||
rawbuf_idx < new_raw_idx;)
|
||
{
|
||
int remain_len;
|
||
remain_len = pstr->len - rawbuf_idx;
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||
prev_st = pstr->cur_state;
|
||
mbclen = mbrtowc (&wc, (const char *) pstr->raw_mbs + rawbuf_idx,
|
||
remain_len, &pstr->cur_state);
|
||
if (BE (mbclen == (size_t) -2 || mbclen == (size_t) -1 || mbclen == 0, 0))
|
||
{
|
||
/* We treat these cases as a singlebyte character. */
|
||
mbclen = 1;
|
||
pstr->cur_state = prev_st;
|
||
}
|
||
/* Then proceed the next character. */
|
||
rawbuf_idx += mbclen;
|
||
}
|
||
*last_wc = (wint_t) wc;
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||
return rawbuf_idx;
|
||
}
|
||
#endif /* RE_ENABLE_I18N */
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||
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||
/* Build the buffer PSTR->MBS, and apply the translation if we need.
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||
This function is used in case of REG_ICASE. */
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||
|
||
static void
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||
build_upper_buffer (pstr)
|
||
re_string_t *pstr;
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||
{
|
||
int char_idx, end_idx;
|
||
end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
|
||
|
||
for (char_idx = pstr->valid_len; char_idx < end_idx; ++char_idx)
|
||
{
|
||
int ch = pstr->raw_mbs[pstr->raw_mbs_idx + char_idx];
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||
if (pstr->trans != NULL)
|
||
{
|
||
ch = pstr->trans[ch];
|
||
pstr->mbs_case[char_idx] = ch;
|
||
}
|
||
if (islower (ch))
|
||
pstr->mbs[char_idx] = toupper (ch);
|
||
else
|
||
pstr->mbs[char_idx] = ch;
|
||
}
|
||
pstr->valid_len = char_idx;
|
||
}
|
||
|
||
/* Apply TRANS to the buffer in PSTR. */
|
||
|
||
static void
|
||
re_string_translate_buffer (pstr)
|
||
re_string_t *pstr;
|
||
{
|
||
int buf_idx, end_idx;
|
||
end_idx = (pstr->bufs_len > pstr->len) ? pstr->len : pstr->bufs_len;
|
||
|
||
for (buf_idx = pstr->valid_len; buf_idx < end_idx; ++buf_idx)
|
||
{
|
||
int ch = pstr->raw_mbs[pstr->raw_mbs_idx + buf_idx];
|
||
pstr->mbs_case[buf_idx] = pstr->trans[ch];
|
||
}
|
||
|
||
pstr->valid_len = buf_idx;
|
||
}
|
||
|
||
/* This function re-construct the buffers.
|
||
Concretely, convert to wide character in case of MB_CUR_MAX > 1,
|
||
convert to upper case in case of REG_ICASE, apply translation. */
|
||
|
||
static reg_errcode_t
|
||
re_string_reconstruct (pstr, idx, eflags, newline)
|
||
re_string_t *pstr;
|
||
int idx, eflags, newline;
|
||
{
|
||
int offset = idx - pstr->raw_mbs_idx;
|
||
if (offset < 0)
|
||
{
|
||
/* Reset buffer. */
|
||
#ifdef RE_ENABLE_I18N
|
||
if (MB_CUR_MAX > 1)
|
||
memset (&pstr->cur_state, '\0', sizeof (mbstate_t));
|
||
#endif /* RE_ENABLE_I18N */
|
||
pstr->len += pstr->raw_mbs_idx;
|
||
pstr->stop += pstr->raw_mbs_idx;
|
||
pstr->valid_len = pstr->raw_mbs_idx = 0;
|
||
pstr->tip_context = ((eflags & REG_NOTBOL) ? CONTEXT_BEGBUF
|
||
: CONTEXT_NEWLINE | CONTEXT_BEGBUF);
|
||
if (!MBS_CASE_ALLOCATED (pstr))
|
||
pstr->mbs_case = (unsigned char *) pstr->raw_mbs;
|
||
if (!MBS_ALLOCATED (pstr) && !MBS_CASE_ALLOCATED (pstr))
|
||
pstr->mbs = (unsigned char *) pstr->raw_mbs;
|
||
offset = idx;
|
||
}
|
||
|
||
if (offset != 0)
|
||
{
|
||
/* Are the characters which are already checked remain? */
|
||
if (offset < pstr->valid_len)
|
||
{
|
||
/* Yes, move them to the front of the buffer. */
|
||
pstr->tip_context = re_string_context_at (pstr, offset - 1, eflags,
|
||
newline);
|
||
#ifdef RE_ENABLE_I18N
|
||
if (MB_CUR_MAX > 1)
|
||
memmove (pstr->wcs, pstr->wcs + offset,
|
||
(pstr->valid_len - offset) * sizeof (wint_t));
|
||
#endif /* RE_ENABLE_I18N */
|
||
if (MBS_ALLOCATED (pstr))
|
||
memmove (pstr->mbs, pstr->mbs + offset,
|
||
pstr->valid_len - offset);
|
||
if (MBS_CASE_ALLOCATED (pstr))
|
||
memmove (pstr->mbs_case, pstr->mbs_case + offset,
|
||
pstr->valid_len - offset);
|
||
pstr->valid_len -= offset;
|
||
#if DEBUG
|
||
assert (pstr->valid_len > 0);
|
||
#endif
|
||
}
|
||
else
|
||
{
|
||
/* No, skip all characters until IDX. */
|
||
pstr->valid_len = 0;
|
||
#ifdef RE_ENABLE_I18N
|
||
if (MB_CUR_MAX > 1)
|
||
{
|
||
int wcs_idx;
|
||
wint_t wc;
|
||
pstr->valid_len = re_string_skip_chars (pstr, idx, &wc) - idx;
|
||
for (wcs_idx = 0; wcs_idx < pstr->valid_len; ++wcs_idx)
|
||
pstr->wcs[wcs_idx] = WEOF;
|
||
if (pstr->trans && wc <= 0xff)
|
||
wc = pstr->trans[wc];
|
||
pstr->tip_context = (IS_WIDE_WORD_CHAR (wc) ? CONTEXT_WORD
|
||
: ((newline && IS_WIDE_NEWLINE (wc))
|
||
? CONTEXT_NEWLINE : 0));
|
||
}
|
||
else
|
||
#endif /* RE_ENABLE_I18N */
|
||
{
|
||
int c = pstr->raw_mbs[pstr->raw_mbs_idx + offset - 1];
|
||
if (pstr->trans)
|
||
c = pstr->trans[c];
|
||
pstr->tip_context = (IS_WORD_CHAR (c) ? CONTEXT_WORD
|
||
: ((newline && IS_NEWLINE (c))
|
||
? CONTEXT_NEWLINE : 0));
|
||
}
|
||
}
|
||
if (!MBS_CASE_ALLOCATED (pstr))
|
||
{
|
||
pstr->mbs_case += offset;
|
||
/* In case of !MBS_ALLOCATED && !MBS_CASE_ALLOCATED. */
|
||
if (!MBS_ALLOCATED (pstr))
|
||
pstr->mbs += offset;
|
||
}
|
||
}
|
||
pstr->raw_mbs_idx = idx;
|
||
pstr->len -= offset;
|
||
pstr->stop -= offset;
|
||
|
||
/* Then build the buffers. */
|
||
#ifdef RE_ENABLE_I18N
|
||
if (MB_CUR_MAX > 1)
|
||
{
|
||
if (pstr->icase)
|
||
build_wcs_upper_buffer (pstr);
|
||
else
|
||
build_wcs_buffer (pstr);
|
||
}
|
||
else
|
||
#endif /* RE_ENABLE_I18N */
|
||
{
|
||
if (pstr->icase)
|
||
build_upper_buffer (pstr);
|
||
else if (pstr->trans != NULL)
|
||
re_string_translate_buffer (pstr);
|
||
}
|
||
pstr->cur_idx = 0;
|
||
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static void
|
||
re_string_destruct (pstr)
|
||
re_string_t *pstr;
|
||
{
|
||
#ifdef RE_ENABLE_I18N
|
||
re_free (pstr->wcs);
|
||
#endif /* RE_ENABLE_I18N */
|
||
if (MBS_ALLOCATED (pstr))
|
||
re_free (pstr->mbs);
|
||
if (MBS_CASE_ALLOCATED (pstr))
|
||
re_free (pstr->mbs_case);
|
||
}
|
||
|
||
/* Return the context at IDX in INPUT. */
|
||
|
||
static unsigned int
|
||
re_string_context_at (input, idx, eflags, newline_anchor)
|
||
const re_string_t *input;
|
||
int idx, eflags, newline_anchor;
|
||
{
|
||
int c;
|
||
if (idx < 0 || idx == input->len)
|
||
{
|
||
if (idx < 0)
|
||
/* In this case, we use the value stored in input->tip_context,
|
||
since we can't know the character in input->mbs[-1] here. */
|
||
return input->tip_context;
|
||
else /* (idx == input->len) */
|
||
return ((eflags & REG_NOTEOL) ? CONTEXT_ENDBUF
|
||
: CONTEXT_NEWLINE | CONTEXT_ENDBUF);
|
||
}
|
||
#ifdef RE_ENABLE_I18N
|
||
if (MB_CUR_MAX > 1)
|
||
{
|
||
wint_t wc;
|
||
int wc_idx = idx;
|
||
while(input->wcs[wc_idx] == WEOF)
|
||
{
|
||
#ifdef DEBUG
|
||
/* It must not happen. */
|
||
assert (wc_idx >= 0);
|
||
#endif
|
||
--wc_idx;
|
||
if (wc_idx < 0)
|
||
return input->tip_context;
|
||
}
|
||
wc = input->wcs[wc_idx];
|
||
if (IS_WIDE_WORD_CHAR (wc))
|
||
return CONTEXT_WORD;
|
||
return (newline_anchor && IS_WIDE_NEWLINE (wc)) ? CONTEXT_NEWLINE : 0;
|
||
}
|
||
else
|
||
#endif
|
||
{
|
||
c = re_string_byte_at (input, idx);
|
||
if (IS_WORD_CHAR (c))
|
||
return CONTEXT_WORD;
|
||
return (newline_anchor && IS_NEWLINE (c)) ? CONTEXT_NEWLINE : 0;
|
||
}
|
||
}
|
||
|
||
/* Functions for set operation. */
|
||
|
||
static reg_errcode_t
|
||
re_node_set_alloc (set, size)
|
||
re_node_set *set;
|
||
int size;
|
||
{
|
||
set->alloc = size;
|
||
set->nelem = 0;
|
||
set->elems = re_malloc (int, size);
|
||
if (BE (set->elems == NULL, 0))
|
||
return REG_ESPACE;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static reg_errcode_t
|
||
re_node_set_init_1 (set, elem)
|
||
re_node_set *set;
|
||
int elem;
|
||
{
|
||
set->alloc = 1;
|
||
set->nelem = 1;
|
||
set->elems = re_malloc (int, 1);
|
||
if (BE (set->elems == NULL, 0))
|
||
{
|
||
set->alloc = set->nelem = 0;
|
||
return REG_ESPACE;
|
||
}
|
||
set->elems[0] = elem;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static reg_errcode_t
|
||
re_node_set_init_2 (set, elem1, elem2)
|
||
re_node_set *set;
|
||
int elem1, elem2;
|
||
{
|
||
set->alloc = 2;
|
||
set->elems = re_malloc (int, 2);
|
||
if (BE (set->elems == NULL, 0))
|
||
return REG_ESPACE;
|
||
if (elem1 == elem2)
|
||
{
|
||
set->nelem = 1;
|
||
set->elems[0] = elem1;
|
||
}
|
||
else
|
||
{
|
||
set->nelem = 2;
|
||
if (elem1 < elem2)
|
||
{
|
||
set->elems[0] = elem1;
|
||
set->elems[1] = elem2;
|
||
}
|
||
else
|
||
{
|
||
set->elems[0] = elem2;
|
||
set->elems[1] = elem1;
|
||
}
|
||
}
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
static reg_errcode_t
|
||
re_node_set_init_copy (dest, src)
|
||
re_node_set *dest;
|
||
const re_node_set *src;
|
||
{
|
||
dest->nelem = src->nelem;
|
||
if (src->nelem > 0)
|
||
{
|
||
dest->alloc = dest->nelem;
|
||
dest->elems = re_malloc (int, dest->alloc);
|
||
if (BE (dest->elems == NULL, 0))
|
||
{
|
||
dest->alloc = dest->nelem = 0;
|
||
return REG_ESPACE;
|
||
}
|
||
memcpy (dest->elems, src->elems, src->nelem * sizeof (int));
|
||
}
|
||
else
|
||
re_node_set_init_empty (dest);
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Calculate the intersection of the sets SRC1 and SRC2. And merge it to
|
||
DEST. Return value indicate the error code or REG_NOERROR if succeeded.
|
||
Note: We assume dest->elems is NULL, when dest->alloc is 0. */
|
||
|
||
static reg_errcode_t
|
||
re_node_set_add_intersect (dest, src1, src2)
|
||
re_node_set *dest;
|
||
const re_node_set *src1, *src2;
|
||
{
|
||
int i1, i2, id;
|
||
if (src1->nelem > 0 && src2->nelem > 0)
|
||
{
|
||
if (src1->nelem + src2->nelem + dest->nelem > dest->alloc)
|
||
{
|
||
dest->alloc = src1->nelem + src2->nelem + dest->nelem;
|
||
dest->elems = re_realloc (dest->elems, int, dest->alloc);
|
||
if (BE (dest->elems == NULL, 0))
|
||
return REG_ESPACE;
|
||
}
|
||
}
|
||
else
|
||
return REG_NOERROR;
|
||
|
||
for (i1 = i2 = id = 0 ; i1 < src1->nelem && i2 < src2->nelem ;)
|
||
{
|
||
if (src1->elems[i1] > src2->elems[i2])
|
||
{
|
||
++i2;
|
||
continue;
|
||
}
|
||
if (src1->elems[i1] == src2->elems[i2])
|
||
{
|
||
while (id < dest->nelem && dest->elems[id] < src2->elems[i2])
|
||
++id;
|
||
if (id < dest->nelem && dest->elems[id] == src2->elems[i2])
|
||
++id;
|
||
else
|
||
{
|
||
memmove (dest->elems + id + 1, dest->elems + id,
|
||
sizeof (int) * (dest->nelem - id));
|
||
dest->elems[id++] = src2->elems[i2++];
|
||
++dest->nelem;
|
||
}
|
||
}
|
||
++i1;
|
||
}
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Calculate the union set of the sets SRC1 and SRC2. And store it to
|
||
DEST. Return value indicate the error code or REG_NOERROR if succeeded. */
|
||
|
||
static reg_errcode_t
|
||
re_node_set_init_union (dest, src1, src2)
|
||
re_node_set *dest;
|
||
const re_node_set *src1, *src2;
|
||
{
|
||
int i1, i2, id;
|
||
if (src1 != NULL && src1->nelem > 0 && src2 != NULL && src2->nelem > 0)
|
||
{
|
||
dest->alloc = src1->nelem + src2->nelem;
|
||
dest->elems = re_malloc (int, dest->alloc);
|
||
if (BE (dest->elems == NULL, 0))
|
||
return REG_ESPACE;
|
||
}
|
||
else
|
||
{
|
||
if (src1 != NULL && src1->nelem > 0)
|
||
return re_node_set_init_copy (dest, src1);
|
||
else if (src2 != NULL && src2->nelem > 0)
|
||
return re_node_set_init_copy (dest, src2);
|
||
else
|
||
re_node_set_init_empty (dest);
|
||
return REG_NOERROR;
|
||
}
|
||
for (i1 = i2 = id = 0 ; i1 < src1->nelem && i2 < src2->nelem ;)
|
||
{
|
||
if (src1->elems[i1] > src2->elems[i2])
|
||
{
|
||
dest->elems[id++] = src2->elems[i2++];
|
||
continue;
|
||
}
|
||
if (src1->elems[i1] == src2->elems[i2])
|
||
++i2;
|
||
dest->elems[id++] = src1->elems[i1++];
|
||
}
|
||
if (i1 < src1->nelem)
|
||
{
|
||
memcpy (dest->elems + id, src1->elems + i1,
|
||
(src1->nelem - i1) * sizeof (int));
|
||
id += src1->nelem - i1;
|
||
}
|
||
else if (i2 < src2->nelem)
|
||
{
|
||
memcpy (dest->elems + id, src2->elems + i2,
|
||
(src2->nelem - i2) * sizeof (int));
|
||
id += src2->nelem - i2;
|
||
}
|
||
dest->nelem = id;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Calculate the union set of the sets DEST and SRC. And store it to
|
||
DEST. Return value indicate the error code or REG_NOERROR if succeeded. */
|
||
|
||
static reg_errcode_t
|
||
re_node_set_merge (dest, src)
|
||
re_node_set *dest;
|
||
const re_node_set *src;
|
||
{
|
||
int si, di;
|
||
if (src == NULL || src->nelem == 0)
|
||
return REG_NOERROR;
|
||
if (dest->alloc < src->nelem + dest->nelem)
|
||
{
|
||
int *new_buffer;
|
||
dest->alloc = 2 * (src->nelem + dest->alloc);
|
||
new_buffer = re_realloc (dest->elems, int, dest->alloc);
|
||
if (BE (new_buffer == NULL, 0))
|
||
return REG_ESPACE;
|
||
dest->elems = new_buffer;
|
||
}
|
||
|
||
for (si = 0, di = 0 ; si < src->nelem && di < dest->nelem ;)
|
||
{
|
||
int cp_from, ncp, mid, right, src_elem = src->elems[si];
|
||
/* Binary search the spot we will add the new element. */
|
||
right = dest->nelem;
|
||
while (di < right)
|
||
{
|
||
mid = (di + right) / 2;
|
||
if (dest->elems[mid] < src_elem)
|
||
di = mid + 1;
|
||
else
|
||
right = mid;
|
||
}
|
||
if (di >= dest->nelem)
|
||
break;
|
||
|
||
if (dest->elems[di] == src_elem)
|
||
{
|
||
/* Skip since, DEST already has the element. */
|
||
++di;
|
||
++si;
|
||
continue;
|
||
}
|
||
|
||
/* Skip the src elements which are less than dest->elems[di]. */
|
||
cp_from = si;
|
||
while (si < src->nelem && src->elems[si] < dest->elems[di])
|
||
++si;
|
||
/* Copy these src elements. */
|
||
ncp = si - cp_from;
|
||
memmove (dest->elems + di + ncp, dest->elems + di,
|
||
sizeof (int) * (dest->nelem - di));
|
||
memcpy (dest->elems + di, src->elems + cp_from,
|
||
sizeof (int) * ncp);
|
||
/* Update counters. */
|
||
di += ncp;
|
||
dest->nelem += ncp;
|
||
}
|
||
|
||
/* Copy remaining src elements. */
|
||
if (si < src->nelem)
|
||
{
|
||
memcpy (dest->elems + di, src->elems + si,
|
||
sizeof (int) * (src->nelem - si));
|
||
dest->nelem += src->nelem - si;
|
||
}
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Insert the new element ELEM to the re_node_set* SET.
|
||
return 0 if SET already has ELEM,
|
||
return -1 if an error is occured, return 1 otherwise. */
|
||
|
||
static int
|
||
re_node_set_insert (set, elem)
|
||
re_node_set *set;
|
||
int elem;
|
||
{
|
||
int idx, right, mid;
|
||
/* In case of the set is empty. */
|
||
if (set->elems == NULL || set->alloc == 0)
|
||
{
|
||
if (BE (re_node_set_init_1 (set, elem) == REG_NOERROR, 1))
|
||
return 1;
|
||
else
|
||
return -1;
|
||
}
|
||
|
||
/* Binary search the spot we will add the new element. */
|
||
idx = 0;
|
||
right = set->nelem;
|
||
while (idx < right)
|
||
{
|
||
mid = (idx + right) / 2;
|
||
if (set->elems[mid] < elem)
|
||
idx = mid + 1;
|
||
else
|
||
right = mid;
|
||
}
|
||
|
||
/* Realloc if we need. */
|
||
if (set->alloc < set->nelem + 1)
|
||
{
|
||
int *new_array;
|
||
set->alloc = set->alloc * 2;
|
||
new_array = re_malloc (int, set->alloc);
|
||
if (BE (new_array == NULL, 0))
|
||
return -1;
|
||
/* Copy the elements they are followed by the new element. */
|
||
if (idx > 0)
|
||
memcpy (new_array, set->elems, sizeof (int) * (idx));
|
||
/* Copy the elements which follows the new element. */
|
||
if (set->nelem - idx > 0)
|
||
memcpy (new_array + idx + 1, set->elems + idx,
|
||
sizeof (int) * (set->nelem - idx));
|
||
re_free (set->elems);
|
||
set->elems = new_array;
|
||
}
|
||
else
|
||
{
|
||
/* Move the elements which follows the new element. */
|
||
if (set->nelem - idx > 0)
|
||
memmove (set->elems + idx + 1, set->elems + idx,
|
||
sizeof (int) * (set->nelem - idx));
|
||
}
|
||
/* Insert the new element. */
|
||
set->elems[idx] = elem;
|
||
++set->nelem;
|
||
return 1;
|
||
}
|
||
|
||
/* Compare two node sets SET1 and SET2.
|
||
return 1 if SET1 and SET2 are equivalent, retrun 0 otherwise. */
|
||
|
||
static int
|
||
re_node_set_compare (set1, set2)
|
||
const re_node_set *set1, *set2;
|
||
{
|
||
int i;
|
||
if (set1 == NULL || set2 == NULL || set1->nelem != set2->nelem)
|
||
return 0;
|
||
for (i = 0 ; i < set1->nelem ; i++)
|
||
if (set1->elems[i] != set2->elems[i])
|
||
return 0;
|
||
return 1;
|
||
}
|
||
|
||
/* Return (idx + 1) if SET contains the element ELEM, return 0 otherwise. */
|
||
|
||
static int
|
||
re_node_set_contains (set, elem)
|
||
const re_node_set *set;
|
||
int elem;
|
||
{
|
||
int idx, right, mid;
|
||
if (set->nelem <= 0)
|
||
return 0;
|
||
|
||
/* Binary search the element. */
|
||
idx = 0;
|
||
right = set->nelem - 1;
|
||
while (idx < right)
|
||
{
|
||
mid = (idx + right) / 2;
|
||
if (set->elems[mid] < elem)
|
||
idx = mid + 1;
|
||
else
|
||
right = mid;
|
||
}
|
||
return set->elems[idx] == elem ? idx + 1 : 0;
|
||
}
|
||
|
||
static void
|
||
re_node_set_remove_at (set, idx)
|
||
re_node_set *set;
|
||
int idx;
|
||
{
|
||
if (idx < 0 || idx >= set->nelem)
|
||
return;
|
||
if (idx < set->nelem - 1)
|
||
memmove (set->elems + idx, set->elems + idx + 1,
|
||
sizeof (int) * (set->nelem - idx - 1));
|
||
--set->nelem;
|
||
}
|
||
|
||
|
||
/* Add the token TOKEN to dfa->nodes, and return the index of the token.
|
||
Or return -1, if an error will be occured. */
|
||
|
||
static int
|
||
re_dfa_add_node (dfa, token, mode)
|
||
re_dfa_t *dfa;
|
||
re_token_t token;
|
||
int mode;
|
||
{
|
||
if (dfa->nodes_len >= dfa->nodes_alloc)
|
||
{
|
||
re_token_t *new_array;
|
||
dfa->nodes_alloc *= 2;
|
||
new_array = re_realloc (dfa->nodes, re_token_t, dfa->nodes_alloc);
|
||
if (BE (new_array == NULL, 0))
|
||
return -1;
|
||
else
|
||
dfa->nodes = new_array;
|
||
if (mode)
|
||
{
|
||
int *new_nexts, *new_indices;
|
||
re_node_set *new_edests, *new_eclosures, *new_inveclosures;
|
||
|
||
new_nexts = re_realloc (dfa->nexts, int, dfa->nodes_alloc);
|
||
new_indices = re_realloc (dfa->org_indices, int, dfa->nodes_alloc);
|
||
new_edests = re_realloc (dfa->edests, re_node_set, dfa->nodes_alloc);
|
||
new_eclosures = re_realloc (dfa->eclosures, re_node_set,
|
||
dfa->nodes_alloc);
|
||
new_inveclosures = re_realloc (dfa->inveclosures, re_node_set,
|
||
dfa->nodes_alloc);
|
||
if (BE (new_nexts == NULL || new_indices == NULL
|
||
|| new_edests == NULL || new_eclosures == NULL
|
||
|| new_inveclosures == NULL, 0))
|
||
return -1;
|
||
dfa->nexts = new_nexts;
|
||
dfa->org_indices = new_indices;
|
||
dfa->edests = new_edests;
|
||
dfa->eclosures = new_eclosures;
|
||
dfa->inveclosures = new_inveclosures;
|
||
}
|
||
}
|
||
dfa->nodes[dfa->nodes_len] = token;
|
||
dfa->nodes[dfa->nodes_len].duplicated = 0;
|
||
dfa->nodes[dfa->nodes_len].constraint = 0;
|
||
return dfa->nodes_len++;
|
||
}
|
||
|
||
static unsigned int inline
|
||
calc_state_hash (nodes, context)
|
||
const re_node_set *nodes;
|
||
unsigned int context;
|
||
{
|
||
unsigned int hash = nodes->nelem + context;
|
||
int i;
|
||
for (i = 0 ; i < nodes->nelem ; i++)
|
||
hash += nodes->elems[i];
|
||
return hash;
|
||
}
|
||
|
||
/* Search for the state whose node_set is equivalent to NODES.
|
||
Return the pointer to the state, if we found it in the DFA.
|
||
Otherwise create the new one and return it. In case of an error
|
||
return NULL and set the error code in ERR.
|
||
Note: - We assume NULL as the invalid state, then it is possible that
|
||
return value is NULL and ERR is REG_NOERROR.
|
||
- We never return non-NULL value in case of any errors, it is for
|
||
optimization. */
|
||
|
||
static re_dfastate_t*
|
||
re_acquire_state (err, dfa, nodes)
|
||
reg_errcode_t *err;
|
||
re_dfa_t *dfa;
|
||
const re_node_set *nodes;
|
||
{
|
||
unsigned int hash;
|
||
re_dfastate_t *new_state;
|
||
struct re_state_table_entry *spot;
|
||
int i;
|
||
if (BE (nodes->nelem == 0, 0))
|
||
{
|
||
*err = REG_NOERROR;
|
||
return NULL;
|
||
}
|
||
hash = calc_state_hash (nodes, 0);
|
||
spot = dfa->state_table + (hash & dfa->state_hash_mask);
|
||
|
||
for (i = 0 ; i < spot->num ; i++)
|
||
{
|
||
re_dfastate_t *state = spot->array[i];
|
||
if (hash != state->hash)
|
||
continue;
|
||
if (re_node_set_compare (&state->nodes, nodes))
|
||
return state;
|
||
}
|
||
|
||
/* There are no appropriate state in the dfa, create the new one. */
|
||
new_state = create_ci_newstate (dfa, nodes, hash);
|
||
if (BE (new_state != NULL, 1))
|
||
return new_state;
|
||
else
|
||
{
|
||
*err = REG_ESPACE;
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
/* Search for the state whose node_set is equivalent to NODES and
|
||
whose context is equivalent to CONTEXT.
|
||
Return the pointer to the state, if we found it in the DFA.
|
||
Otherwise create the new one and return it. In case of an error
|
||
return NULL and set the error code in ERR.
|
||
Note: - We assume NULL as the invalid state, then it is possible that
|
||
return value is NULL and ERR is REG_NOERROR.
|
||
- We never return non-NULL value in case of any errors, it is for
|
||
optimization. */
|
||
|
||
static re_dfastate_t*
|
||
re_acquire_state_context (err, dfa, nodes, context)
|
||
reg_errcode_t *err;
|
||
re_dfa_t *dfa;
|
||
const re_node_set *nodes;
|
||
unsigned int context;
|
||
{
|
||
unsigned int hash;
|
||
re_dfastate_t *new_state;
|
||
struct re_state_table_entry *spot;
|
||
int i;
|
||
if (nodes->nelem == 0)
|
||
{
|
||
*err = REG_NOERROR;
|
||
return NULL;
|
||
}
|
||
hash = calc_state_hash (nodes, context);
|
||
spot = dfa->state_table + (hash & dfa->state_hash_mask);
|
||
|
||
for (i = 0 ; i < spot->num ; i++)
|
||
{
|
||
re_dfastate_t *state = spot->array[i];
|
||
if (hash != state->hash)
|
||
continue;
|
||
if (re_node_set_compare (state->entrance_nodes, nodes)
|
||
&& state->context == context)
|
||
return state;
|
||
}
|
||
/* There are no appropriate state in `dfa', create the new one. */
|
||
new_state = create_cd_newstate (dfa, nodes, context, hash);
|
||
if (BE (new_state != NULL, 1))
|
||
return new_state;
|
||
else
|
||
{
|
||
*err = REG_ESPACE;
|
||
return NULL;
|
||
}
|
||
}
|
||
|
||
/* Allocate memory for DFA state and initialize common properties.
|
||
Return the new state if succeeded, otherwise return NULL. */
|
||
|
||
static re_dfastate_t *
|
||
create_newstate_common (dfa, nodes, hash)
|
||
re_dfa_t *dfa;
|
||
const re_node_set *nodes;
|
||
unsigned int hash;
|
||
{
|
||
re_dfastate_t *newstate;
|
||
reg_errcode_t err;
|
||
newstate = (re_dfastate_t *) calloc (sizeof (re_dfastate_t), 1);
|
||
if (BE (newstate == NULL, 0))
|
||
return NULL;
|
||
err = re_node_set_init_copy (&newstate->nodes, nodes);
|
||
if (BE (err != REG_NOERROR, 0))
|
||
{
|
||
re_free (newstate);
|
||
return NULL;
|
||
}
|
||
newstate->trtable = NULL;
|
||
newstate->trtable_search = NULL;
|
||
newstate->hash = hash;
|
||
return newstate;
|
||
}
|
||
|
||
/* Store the new state NEWSTATE whose hash value is HASH in appropriate
|
||
position. Return value indicate the error code if failed. */
|
||
|
||
static reg_errcode_t
|
||
register_state (dfa, newstate, hash)
|
||
re_dfa_t *dfa;
|
||
re_dfastate_t *newstate;
|
||
unsigned int hash;
|
||
{
|
||
struct re_state_table_entry *spot;
|
||
spot = dfa->state_table + (hash & dfa->state_hash_mask);
|
||
|
||
if (spot->alloc <= spot->num)
|
||
{
|
||
re_dfastate_t **new_array;
|
||
spot->alloc = 2 * spot->num + 2;
|
||
new_array = re_realloc (spot->array, re_dfastate_t *, spot->alloc);
|
||
if (BE (new_array == NULL, 0))
|
||
return REG_ESPACE;
|
||
spot->array = new_array;
|
||
}
|
||
spot->array[spot->num++] = newstate;
|
||
return REG_NOERROR;
|
||
}
|
||
|
||
/* Create the new state which is independ of contexts.
|
||
Return the new state if succeeded, otherwise return NULL. */
|
||
|
||
static re_dfastate_t *
|
||
create_ci_newstate (dfa, nodes, hash)
|
||
re_dfa_t *dfa;
|
||
const re_node_set *nodes;
|
||
unsigned int hash;
|
||
{
|
||
int i;
|
||
reg_errcode_t err;
|
||
re_dfastate_t *newstate;
|
||
newstate = create_newstate_common (dfa, nodes, hash);
|
||
if (BE (newstate == NULL, 0))
|
||
return NULL;
|
||
newstate->entrance_nodes = &newstate->nodes;
|
||
|
||
for (i = 0 ; i < nodes->nelem ; i++)
|
||
{
|
||
re_token_t *node = dfa->nodes + nodes->elems[i];
|
||
re_token_type_t type = node->type;
|
||
if (type == CHARACTER && !node->constraint)
|
||
continue;
|
||
|
||
/* If the state has the halt node, the state is a halt state. */
|
||
else if (type == END_OF_RE)
|
||
newstate->halt = 1;
|
||
#ifdef RE_ENABLE_I18N
|
||
else if (type == COMPLEX_BRACKET
|
||
|| (type == OP_PERIOD && MB_CUR_MAX > 1))
|
||
newstate->accept_mb = 1;
|
||
#endif /* RE_ENABLE_I18N */
|
||
else if (type == OP_BACK_REF)
|
||
newstate->has_backref = 1;
|
||
else if (type == ANCHOR || node->constraint)
|
||
newstate->has_constraint = 1;
|
||
}
|
||
err = register_state (dfa, newstate, hash);
|
||
if (BE (err != REG_NOERROR, 0))
|
||
{
|
||
free_state (newstate);
|
||
newstate = NULL;
|
||
}
|
||
return newstate;
|
||
}
|
||
|
||
/* Create the new state which is depend on the context CONTEXT.
|
||
Return the new state if succeeded, otherwise return NULL. */
|
||
|
||
static re_dfastate_t *
|
||
create_cd_newstate (dfa, nodes, context, hash)
|
||
re_dfa_t *dfa;
|
||
const re_node_set *nodes;
|
||
unsigned int context, hash;
|
||
{
|
||
int i, nctx_nodes = 0;
|
||
reg_errcode_t err;
|
||
re_dfastate_t *newstate;
|
||
|
||
newstate = create_newstate_common (dfa, nodes, hash);
|
||
if (BE (newstate == NULL, 0))
|
||
return NULL;
|
||
newstate->context = context;
|
||
newstate->entrance_nodes = &newstate->nodes;
|
||
|
||
for (i = 0 ; i < nodes->nelem ; i++)
|
||
{
|
||
unsigned int constraint = 0;
|
||
re_token_t *node = dfa->nodes + nodes->elems[i];
|
||
re_token_type_t type = node->type;
|
||
if (node->constraint)
|
||
constraint = node->constraint;
|
||
|
||
if (type == CHARACTER && !constraint)
|
||
continue;
|
||
/* If the state has the halt node, the state is a halt state. */
|
||
else if (type == END_OF_RE)
|
||
newstate->halt = 1;
|
||
#ifdef RE_ENABLE_I18N
|
||
else if (type == COMPLEX_BRACKET
|
||
|| (type == OP_PERIOD && MB_CUR_MAX > 1))
|
||
newstate->accept_mb = 1;
|
||
#endif /* RE_ENABLE_I18N */
|
||
else if (type == OP_BACK_REF)
|
||
newstate->has_backref = 1;
|
||
else if (type == ANCHOR)
|
||
constraint = node->opr.ctx_type;
|
||
|
||
if (constraint)
|
||
{
|
||
if (newstate->entrance_nodes == &newstate->nodes)
|
||
{
|
||
newstate->entrance_nodes = re_malloc (re_node_set, 1);
|
||
if (BE (newstate->entrance_nodes == NULL, 0))
|
||
{
|
||
free_state (newstate);
|
||
return NULL;
|
||
}
|
||
re_node_set_init_copy (newstate->entrance_nodes, nodes);
|
||
nctx_nodes = 0;
|
||
newstate->has_constraint = 1;
|
||
}
|
||
|
||
if (NOT_SATISFY_PREV_CONSTRAINT (constraint,context))
|
||
{
|
||
re_node_set_remove_at (&newstate->nodes, i - nctx_nodes);
|
||
++nctx_nodes;
|
||
}
|
||
}
|
||
}
|
||
err = register_state (dfa, newstate, hash);
|
||
if (BE (err != REG_NOERROR, 0))
|
||
{
|
||
free_state (newstate);
|
||
newstate = NULL;
|
||
}
|
||
return newstate;
|
||
}
|
||
|
||
static void
|
||
free_state (state)
|
||
re_dfastate_t *state;
|
||
{
|
||
if (state->entrance_nodes != &state->nodes)
|
||
{
|
||
re_node_set_free (state->entrance_nodes);
|
||
re_free (state->entrance_nodes);
|
||
}
|
||
re_node_set_free (&state->nodes);
|
||
re_free (state->trtable);
|
||
re_free (state->trtable_search);
|
||
re_free (state);
|
||
}
|