#ifdef RE_ENABLE_I18N
static void optimize_utf8 (re_dfa_t *dfa);
#endif
-struct subexp_optimize
-{
- re_dfa_t *dfa;
- re_token_t *nodes;
- int no_sub, re_nsub;
-};
-static bin_tree_t *optimize_subexps (struct subexp_optimize *so,
- bin_tree_t *node, int sidx, int depth);
-static reg_errcode_t analyze (re_dfa_t *dfa);
-static reg_errcode_t analyze_tree (re_dfa_t *dfa, bin_tree_t *node);
-static void calc_first (re_dfa_t *dfa, bin_tree_t *node);
-static void calc_next (re_dfa_t *dfa, bin_tree_t *node);
-static void calc_epsdest (re_dfa_t *dfa, bin_tree_t *node);
+static reg_errcode_t analyze (regex_t *preg);
+static reg_errcode_t create_initial_state (re_dfa_t *dfa);
+static reg_errcode_t preorder (bin_tree_t *root,
+ reg_errcode_t (fn (void *, bin_tree_t *)),
+ void *extra);
+static reg_errcode_t postorder (bin_tree_t *root,
+ reg_errcode_t (fn (void *, bin_tree_t *)),
+ void *extra);
+static reg_errcode_t optimize_subexps (void *extra, bin_tree_t *node);
+static reg_errcode_t lower_subexps (void *extra, bin_tree_t *node);
+static bin_tree_t *lower_subexp (reg_errcode_t *err, regex_t *preg,
+ bin_tree_t *node);
+static reg_errcode_t calc_first (void *extra, bin_tree_t *node);
+static reg_errcode_t calc_next (void *extra, bin_tree_t *node);
+static reg_errcode_t link_nfa_nodes (void *extra, bin_tree_t *node);
static reg_errcode_t duplicate_node_closure (re_dfa_t *dfa, int top_org_node,
int top_clone_node, int root_node,
unsigned int constraint);
int non_match, reg_errcode_t *err);
static bin_tree_t *create_tree (re_dfa_t *dfa,
bin_tree_t *left, bin_tree_t *right,
- re_token_type_t type, int index);
-static bin_tree_t *re_dfa_add_tree_node (re_dfa_t *dfa,
- bin_tree_t *left, bin_tree_t *right,
- const re_token_t *token)
- __attribute ((noinline));
+ re_token_type_t type);
+static bin_tree_t *create_token_tree (re_dfa_t *dfa,
+ bin_tree_t *left, bin_tree_t *right,
+ const re_token_t *token);
static bin_tree_t *duplicate_tree (const bin_tree_t *src, re_dfa_t *dfa);
-static void mark_opt_subexp (const bin_tree_t *src, re_dfa_t *dfa);
-static void mark_opt_subexp_iter (const bin_tree_t *src, re_dfa_t *dfa, int idx);
+static void free_token (re_token_t *node);
+static reg_errcode_t free_tree (void *extra, bin_tree_t *node);
+static reg_errcode_t mark_opt_subexp (void *extra, bin_tree_t *node);
\f
/* This table gives an error message for each of the error codes listed
in regex.h. Obviously the order here has to be same as there.
if (dfa->nodes)
for (i = 0; i < dfa->nodes_len; ++i)
- {
- re_token_t *node = dfa->nodes + i;
-#ifdef RE_ENABLE_I18N
- if (node->type == COMPLEX_BRACKET && node->duplicated == 0)
- free_charset (node->opr.mbcset);
- else
-#endif /* RE_ENABLE_I18N */
- if (node->type == SIMPLE_BRACKET && node->duplicated == 0)
- re_free (node->opr.sbcset);
- }
+ free_token (dfa->nodes + i);
re_free (dfa->nexts);
for (i = 0; i < dfa->nodes_len; ++i)
{
if (BE (dfa->str_tree == NULL, 0))
goto re_compile_internal_free_return;
+ /* Analyze the tree and create the nfa. */
+ err = analyze (preg);
+ if (BE (err != REG_NOERROR, 0))
+ goto re_compile_internal_free_return;
+
#ifdef RE_ENABLE_I18N
/* If possible, do searching in single byte encoding to speed things up. */
if (dfa->is_utf8 && !(syntax & RE_ICASE) && preg->translate == NULL)
optimize_utf8 (dfa);
#endif
- if (preg->re_nsub > 0)
- {
- struct subexp_optimize so;
-
- so.dfa = dfa;
- so.nodes = dfa->nodes;
- so.no_sub = preg->no_sub;
- so.re_nsub = preg->re_nsub;
- dfa->str_tree = optimize_subexps (&so, dfa->str_tree, -1, 0);
- }
-
- /* Analyze the tree and collect information which is necessary to
- create the dfa. */
- err = analyze (dfa);
- if (BE (err != REG_NOERROR, 0))
- goto re_compile_internal_free_return;
-
/* Then create the initial state of the dfa. */
err = create_initial_state (dfa);
/* Initial states have the epsilon closure of the node which is
the first node of the regular expression. */
- first = dfa->str_tree->first;
+ first = dfa->str_tree->first->node_idx;
dfa->init_node = first;
err = re_node_set_init_copy (&init_nodes, dfa->eclosures + first);
if (BE (err != REG_NOERROR, 0))
case OP_ALT:
case END_OF_RE:
case OP_DUP_ASTERISK:
- case OP_DUP_QUESTION:
case OP_OPEN_SUBEXP:
case OP_CLOSE_SUBEXP:
break;
+ case COMPLEX_BRACKET:
+ return;
case SIMPLE_BRACKET:
/* Just double check. */
for (i = 0x80 / UINT_BITS; i < BITSET_UINTS; ++i)
return;
break;
default:
- return;
+ abort ();
}
if (mb_chars || has_period)
}
#endif
\f
-static bin_tree_t *
-optimize_subexps (so, node, sidx, depth)
- struct subexp_optimize *so;
- bin_tree_t *node;
- int sidx, depth;
-{
- int idx, new_depth, new_sidx;
- bin_tree_t *ret;
- if (node == NULL)
- return NULL;
-
- new_depth = 0;
- new_sidx = sidx;
- if ((depth & 1) && node->type == CONCAT
- && node->right && node->right->type == 0
- && so->nodes[idx = node->right->node_idx].type == OP_CLOSE_SUBEXP)
- {
- new_depth = depth + 1;
- if (new_depth == 2
- || (so->nodes[idx].opr.idx < 8 * sizeof (so->dfa->used_bkref_map)
- && so->dfa->used_bkref_map & (1 << so->nodes[idx].opr.idx)))
- new_sidx = so->nodes[idx].opr.idx;
- }
- node->left = optimize_subexps (so, node->left, new_sidx, new_depth);
- new_depth = (depth & 1) == 0 && node->type == CONCAT
- && node->left && node->left->type == 0
- && so->nodes[node->left->node_idx].type == OP_OPEN_SUBEXP
- ? depth + 1 : 0;
- node->right = optimize_subexps (so, node->right, sidx, new_depth);
-
- if (node->type != CONCAT)
- return node;
- if ((depth & 1) == 0
- && node->left
- && node->left->type == 0
- && so->nodes[idx = node->left->node_idx].type == OP_OPEN_SUBEXP)
- ret = node->right;
- else if ((depth & 1)
- && node->right
- && node->right->type == 0
- && so->nodes[idx = node->right->node_idx].type == OP_CLOSE_SUBEXP)
- ret = node->left;
- else
- return node;
-
- if (so->nodes[idx].opr.idx < 8 * sizeof (so->dfa->used_bkref_map)
- && so->dfa->used_bkref_map & (1 << so->nodes[idx].opr.idx))
- return node;
-
- if (!so->no_sub)
- {
- int i;
-
- if (depth < 2)
- return node;
-
- if (so->dfa->subexp_map == NULL)
- {
- so->dfa->subexp_map = re_malloc (int, so->re_nsub);
- if (so->dfa->subexp_map == NULL)
- return node;
-
- for (i = 0; i < so->re_nsub; i++)
- so->dfa->subexp_map[i] = i;
- }
-
- i = so->nodes[idx].opr.idx;
- assert (sidx < i);
- so->dfa->subexp_map[i] = sidx;
- }
-
- so->nodes[idx].type = OP_DELETED_SUBEXP;
- ret->parent = node->parent;
- return ret;
-}
-\f
/* Analyze the structure tree, and calculate "first", "next", "edest",
"eclosure", and "inveclosure". */
static reg_errcode_t
-analyze (dfa)
- re_dfa_t *dfa;
+analyze (preg)
+ regex_t *preg;
{
- int i;
+ re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
reg_errcode_t ret;
/* Allocate arrays. */
if (BE (dfa->nexts == NULL || dfa->org_indices == NULL || dfa->edests == NULL
|| dfa->eclosures == NULL || dfa->inveclosures == NULL, 0))
return REG_ESPACE;
- /* Initialize them. */
- for (i = 0; i < dfa->nodes_len; ++i)
+
+ dfa->subexp_map = re_malloc (int, preg->re_nsub);
+ if (dfa->subexp_map != NULL)
{
- dfa->nexts[i] = -1;
- re_node_set_init_empty (dfa->edests + i);
- re_node_set_init_empty (dfa->eclosures + i);
- re_node_set_init_empty (dfa->inveclosures + i);
+ int i;
+ for (i = 0; i < preg->re_nsub; i++)
+ dfa->subexp_map[i] = i;
+ preorder (dfa->str_tree, optimize_subexps, dfa);
+ for (i = 0; i < preg->re_nsub; i++)
+ if (dfa->subexp_map[i] != i)
+ break;
+ if (i == preg->re_nsub)
+ {
+ free (dfa->subexp_map);
+ dfa->subexp_map = NULL;
+ }
}
- ret = analyze_tree (dfa, dfa->str_tree);
- if (BE (ret == REG_NOERROR, 1))
+ ret = postorder (dfa->str_tree, lower_subexps, preg);
+ if (BE (ret != REG_NOERROR, 0))
+ return ret;
+ ret = postorder (dfa->str_tree, calc_first, dfa);
+ if (BE (ret != REG_NOERROR, 0))
+ return ret;
+ preorder (dfa->str_tree, calc_next, dfa);
+ ret = preorder (dfa->str_tree, link_nfa_nodes, dfa);
+ if (BE (ret != REG_NOERROR, 0))
+ return ret;
+ ret = calc_eclosure (dfa);
+ if (BE (ret != REG_NOERROR, 0))
+ return ret;
+ calc_inveclosure (dfa);
+ return ret;
+}
+
+/* Our parse trees are very unbalanced, so we cannot use a stack to
+ implement parse tree visits. Instead, we use parent pointers and
+ some hairy code in these two functions. */
+static reg_errcode_t
+postorder (root, fn, extra)
+ bin_tree_t *root;
+ reg_errcode_t (fn (void *, bin_tree_t *));
+ void *extra;
+{
+ bin_tree_t *node, *prev;
+
+ for (node = root; ; )
{
- ret = calc_eclosure (dfa);
- if (ret == REG_NOERROR)
- calc_inveclosure (dfa);
+ /* Descend down the tree, preferably to the left (or to the right
+ if that's the only child). */
+ while (node->left || node->right)
+ if (node->left)
+ node = node->left;
+ else
+ node = node->right;
+
+ do
+ {
+ reg_errcode_t err = fn (extra, node);
+ if (BE (err != REG_NOERROR, 0))
+ return err;
+ if (node->parent == NULL)
+ return REG_NOERROR;
+ prev = node;
+ node = node->parent;
+ }
+ /* Go up while we have a node that is reached from the right. */
+ while (node->right == prev || node->right == NULL);
+ node = node->right;
}
- return ret;
}
-/* Helper functions for analyze.
- This function calculate "first", "next", and "edest" for the subtree
- whose root is NODE. */
+static reg_errcode_t
+preorder (root, fn, extra)
+ bin_tree_t *root;
+ reg_errcode_t (fn (void *, bin_tree_t *));
+ void *extra;
+{
+ bin_tree_t *node;
+
+ for (node = root; ; )
+ {
+ reg_errcode_t err = fn (extra, node);
+ if (BE (err != REG_NOERROR, 0))
+ return err;
+ /* Go to the left node, or up and to the right. */
+ if (node->left)
+ node = node->left;
+ else
+ {
+ bin_tree_t *prev = NULL;
+ while (node->right == prev || node->right == NULL)
+ {
+ prev = node;
+ node = node->parent;
+ if (!node)
+ return REG_NOERROR;
+ }
+ node = node->right;
+ }
+ }
+}
+
+/* Optimization pass: if a SUBEXP is entirely contained, strip it and tell
+ re_search_internal to map the inner one's opr.idx to this one's. Adjust
+ backreferences as well. Requires a preorder visit. */
static reg_errcode_t
-analyze_tree (dfa, node)
- re_dfa_t *dfa;
+optimize_subexps (extra, node)
+ void *extra;
bin_tree_t *node;
{
- reg_errcode_t ret;
- if (node->first == -1)
- calc_first (dfa, node);
- if (node->next == -1)
- calc_next (dfa, node);
- calc_epsdest (dfa, node);
+ re_dfa_t *dfa = (re_dfa_t *) extra;
- /* Calculate "first" etc. for the left child. */
- if (node->left != NULL)
+ if (node->token.type == OP_BACK_REF && dfa->subexp_map)
{
- ret = analyze_tree (dfa, node->left);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
+ int idx = node->token.opr.idx;
+ node->token.opr.idx = dfa->subexp_map[idx];
+ dfa->used_bkref_map |= 1 << node->token.opr.idx;
}
- /* Calculate "first" etc. for the right child. */
- if (node->right != NULL)
+
+ else if (node->token.type == SUBEXP
+ && node->left && node->left->token.type == SUBEXP)
{
- ret = analyze_tree (dfa, node->right);
- if (BE (ret != REG_NOERROR, 0))
- return ret;
+ int other_idx = node->left->token.opr.idx;
+
+ node->left = node->left->left;
+ if (node->left)
+ node->left->parent = node;
+
+ dfa->subexp_map[other_idx] = dfa->subexp_map[node->token.opr.idx];
+ if (other_idx < 8 * sizeof (dfa->used_bkref_map))
+ dfa->used_bkref_map &= ~(1 << other_idx);
}
+
return REG_NOERROR;
}
-/* Calculate "first" for the node NODE. */
-static void
-calc_first (dfa, node)
- re_dfa_t *dfa;
+/* Lowering pass: Turn each SUBEXP node into the appropriate concatenation
+ of OP_OPEN_SUBEXP, the body of the SUBEXP (if any) and OP_CLOSE_SUBEXP. */
+static reg_errcode_t
+lower_subexps (extra, node)
+ void *extra;
bin_tree_t *node;
{
- int idx, type;
- idx = node->node_idx;
- type = (node->type == 0) ? dfa->nodes[idx].type : node->type;
+ regex_t *preg = (regex_t *) extra;
+ reg_errcode_t err = REG_NOERROR;
- switch (type)
+ if (node->left && node->left->token.type == SUBEXP)
{
-#ifdef DEBUG
- case OP_OPEN_BRACKET:
- case OP_CLOSE_BRACKET:
- case OP_OPEN_DUP_NUM:
- case OP_CLOSE_DUP_NUM:
- case OP_DUP_PLUS:
- case OP_NON_MATCH_LIST:
- case OP_OPEN_COLL_ELEM:
- case OP_CLOSE_COLL_ELEM:
- case OP_OPEN_EQUIV_CLASS:
- case OP_CLOSE_EQUIV_CLASS:
- case OP_OPEN_CHAR_CLASS:
- case OP_CLOSE_CHAR_CLASS:
- /* These must not appear here. */
- assert (0);
-#endif
- case END_OF_RE:
- case CHARACTER:
- case OP_PERIOD:
- case OP_DUP_ASTERISK:
- case OP_DUP_QUESTION:
-#ifdef RE_ENABLE_I18N
- case OP_UTF8_PERIOD:
- case COMPLEX_BRACKET:
-#endif /* RE_ENABLE_I18N */
- case SIMPLE_BRACKET:
- case OP_BACK_REF:
- case ANCHOR:
- case OP_OPEN_SUBEXP:
- case OP_CLOSE_SUBEXP:
- node->first = idx;
- break;
- case OP_ALT:
- node->first = idx;
- break;
- /* else fall through */
- default:
-#ifdef DEBUG
- assert (node->left != NULL);
-#endif
- if (node->left->first == -1)
- calc_first (dfa, node->left);
- node->first = node->left->first;
- break;
+ node->left = lower_subexp (&err, preg, node->left);
+ if (node->left)
+ node->left->parent = node;
+ }
+ if (node->right && node->right->token.type == SUBEXP)
+ {
+ node->right = lower_subexp (&err, preg, node->right);
+ if (node->right)
+ node->right->parent = node;
}
-}
-/* Calculate "next" for the node NODE. */
+ return err;
+}
-static void
-calc_next (dfa, node)
- re_dfa_t *dfa;
+static bin_tree_t *
+lower_subexp (err, preg, node)
+ reg_errcode_t *err;
+ regex_t *preg;
bin_tree_t *node;
{
- int idx, type;
- bin_tree_t *parent = node->parent;
- if (parent == NULL)
+ re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
+ bin_tree_t *body = node->left;
+ bin_tree_t *op, *cls, *tree1, *tree;
+
+ if (preg->no_sub
+ && (node->token.opr.idx >= 8 * sizeof (dfa->used_bkref_map)
+ || !(dfa->used_bkref_map & (1 << node->token.opr.idx))))
+ return node->left;
+
+ /* Convert the SUBEXP node to the concatenation of an
+ OP_OPEN_SUBEXP, the contents, and an OP_CLOSE_SUBEXP. */
+ op = create_tree (dfa, NULL, NULL, OP_OPEN_SUBEXP);
+ cls = create_tree (dfa, NULL, NULL, OP_CLOSE_SUBEXP);
+ tree1 = body ? create_tree (dfa, body, cls, CONCAT) : cls;
+ tree = create_tree (dfa, op, tree1, CONCAT);
+ if (BE (tree == NULL || tree1 == NULL || op == NULL || cls == NULL, 0))
{
- node->next = -1;
- idx = node->node_idx;
- if (node->type == 0)
- dfa->nexts[idx] = node->next;
- return;
+ *err = REG_ESPACE;
+ return NULL;
}
- idx = parent->node_idx;
- type = (parent->type == 0) ? dfa->nodes[idx].type : parent->type;
+ op->token.opr.idx = cls->token.opr.idx = node->token.opr.idx;
+ op->token.opt_subexp = cls->token.opt_subexp = node->token.opt_subexp;
+ return tree;
+}
- switch (type)
+/* Pass 1 in building the NFA: compute FIRST and create unlinked automaton
+ nodes. Requires a postorder visit. */
+static reg_errcode_t
+calc_first (extra, node)
+ void *extra;
+ bin_tree_t *node;
+{
+ re_dfa_t *dfa = (re_dfa_t *) extra;
+ if (node->token.type == CONCAT)
+ {
+ node->first = node->left->first;
+ node->node_idx = node->left->node_idx;
+ }
+ else
+ {
+ node->first = node;
+ node->node_idx = re_dfa_add_node (dfa, node->token);
+ if (BE (node->node_idx == -1, 0))
+ return REG_ESPACE;
+ }
+ return REG_NOERROR;
+}
+
+/* Pass 2: compute NEXT on the tree. Preorder visit. */
+static reg_errcode_t
+calc_next (extra, node)
+ void *extra;
+ bin_tree_t *node;
+{
+ switch (node->token.type)
{
case OP_DUP_ASTERISK:
- node->next = idx;
+ node->left->next = node;
break;
case CONCAT:
- if (parent->left == node)
- {
- if (parent->right->first == -1)
- calc_first (dfa, parent->right);
- node->next = parent->right->first;
- break;
- }
- /* else fall through */
+ node->left->next = node->right->first;
+ node->right->next = node->next;
+ break;
default:
- if (parent->next == -1)
- calc_next (dfa, parent);
- node->next = parent->next;
+ if (node->left)
+ node->left->next = node->next;
+ if (node->right)
+ node->right->next = node->next;
break;
}
- idx = node->node_idx;
- if (node->type == 0)
- dfa->nexts[idx] = node->next;
+ return REG_NOERROR;
}
-/* Calculate "edest" for the node NODE. */
-
-static void
-calc_epsdest (dfa, node)
- re_dfa_t *dfa;
+/* Pass 3: link all DFA nodes to their NEXT node (any order will do). */
+static reg_errcode_t
+link_nfa_nodes (extra, node)
+ void *extra;
bin_tree_t *node;
{
- int idx;
- idx = node->node_idx;
- if (node->type == 0)
+ re_dfa_t *dfa = (re_dfa_t *) extra;
+ int idx = node->node_idx;
+ reg_errcode_t err = REG_NOERROR;
+
+ switch (node->token.type)
{
- if (dfa->nodes[idx].type == OP_DUP_ASTERISK
- || dfa->nodes[idx].type == OP_DUP_QUESTION)
- {
- if (node->left->first == -1)
- calc_first (dfa, node->left);
- if (node->next == -1)
- calc_next (dfa, node);
- re_node_set_init_2 (dfa->edests + idx, node->left->first,
- node->next);
- }
- else if (dfa->nodes[idx].type == OP_ALT)
- {
- int left, right;
- if (node->left != NULL)
- {
- if (node->left->first == -1)
- calc_first (dfa, node->left);
- left = node->left->first;
- }
- else
- {
- if (node->next == -1)
- calc_next (dfa, node);
- left = node->next;
- }
- if (node->right != NULL)
- {
- if (node->right->first == -1)
- calc_first (dfa, node->right);
- right = node->right->first;
- }
- else
- {
- if (node->next == -1)
- calc_next (dfa, node);
- right = node->next;
- }
- re_node_set_init_2 (dfa->edests + idx, left, right);
- }
- else if (dfa->nodes[idx].type == ANCHOR
- || dfa->nodes[idx].type == OP_OPEN_SUBEXP
- || dfa->nodes[idx].type == OP_CLOSE_SUBEXP
- || dfa->nodes[idx].type == OP_BACK_REF)
- re_node_set_init_1 (dfa->edests + idx, node->next);
- else
- assert (!IS_EPSILON_NODE (dfa->nodes[idx].type));
+ case CONCAT:
+ break;
+
+ case END_OF_RE:
+ assert (node->next == NULL);
+ break;
+
+ case OP_DUP_ASTERISK:
+ case OP_ALT:
+ {
+ int left, right;
+ dfa->has_plural_match = 1;
+ if (node->left != NULL)
+ left = node->left->first->node_idx;
+ else
+ left = node->next->node_idx;
+ if (node->right != NULL)
+ right = node->right->first->node_idx;
+ else
+ right = node->next->node_idx;
+ assert (left > -1);
+ assert (right > -1);
+ err = re_node_set_init_2 (dfa->edests + idx, left, right);
+ }
+ break;
+
+ case ANCHOR:
+ case OP_OPEN_SUBEXP:
+ case OP_CLOSE_SUBEXP:
+ err = re_node_set_init_1 (dfa->edests + idx, node->next->node_idx);
+ break;
+
+ case OP_BACK_REF:
+ dfa->nexts[idx] = node->next->node_idx;
+ if (node->token.type == OP_BACK_REF)
+ re_node_set_init_1 (dfa->edests + idx, dfa->nexts[idx]);
+ break;
+
+ default:
+ assert (!IS_EPSILON_NODE (node->token.type));
+ dfa->nexts[idx] = node->next->node_idx;
+ break;
}
+
+ return err;
}
/* Duplicate the epsilon closure of the node ROOT_NODE.
else /* dfa->edests[org_node].nelem == 2 */
{
/* In case of the node can epsilon-transit, and it has two
- destinations. E.g. '|', '*', '+', '?'. */
+ destinations. In the bin_tree_t and DFA, that's '|' and '*'. */
org_dest = dfa->edests[org_node].elems[0];
re_node_set_empty (dfa->edests + clone_node);
/* Search for a duplicated node which satisfies the constraint. */
int *new_idx, org_idx;
unsigned int constraint;
{
- int dup_idx = re_dfa_add_node (dfa, dfa->nodes[org_idx], 1);
+ int dup_idx = re_dfa_add_node (dfa, dfa->nodes[org_idx]);
if (BE (dup_idx == -1, 0))
return REG_ESPACE;
dfa->nodes[dup_idx].constraint = constraint;
if (dfa->nodes[org_idx].type == ANCHOR)
dfa->nodes[dup_idx].constraint |= dfa->nodes[org_idx].opr.ctx_type;
dfa->nodes[dup_idx].duplicated = 1;
- re_node_set_init_empty (dfa->edests + dup_idx);
- re_node_set_init_empty (dfa->eclosures + dup_idx);
- re_node_set_init_empty (dfa->inveclosures + dup_idx);
/* Store the index of the original node. */
dfa->org_indices[dup_idx] = org_idx;
int src, idx, dest;
for (src = 0; src < dfa->nodes_len; ++src)
{
- if (dfa->nodes[src].type == OP_DELETED_SUBEXP)
- continue;
for (idx = 0; idx < dfa->eclosures[src].nelem; ++idx)
{
dest = dfa->eclosures[src].elems[idx];
#ifdef DEBUG
assert (dfa->eclosures[node_idx].nelem != -1);
#endif
- if (dfa->nodes[node_idx].type == OP_DELETED_SUBEXP)
- continue;
/* If we have already calculated, skip it. */
if (dfa->eclosures[node_idx].nelem != 0)
tree = parse_reg_exp (regexp, preg, ¤t_token, syntax, 0, err);
if (BE (*err != REG_NOERROR && tree == NULL, 0))
return NULL;
- eor = re_dfa_add_tree_node (dfa, NULL, NULL, ¤t_token);
+ eor = create_tree (dfa, NULL, NULL, END_OF_RE);
if (tree != NULL)
- root = create_tree (dfa, tree, eor, CONCAT, 0);
+ root = create_tree (dfa, tree, eor, CONCAT);
else
root = eor;
if (BE (eor == NULL || root == NULL, 0))
while (token->type == OP_ALT)
{
- re_token_t alt_token = *token;
fetch_token (token, regexp, syntax | RE_CARET_ANCHORS_HERE);
if (token->type != OP_ALT && token->type != END_OF_RE
&& (nest == 0 || token->type != OP_CLOSE_SUBEXP))
}
else
branch = NULL;
- tree = re_dfa_add_tree_node (dfa, tree, branch, &alt_token);
+ tree = create_tree (dfa, tree, branch, OP_ALT);
if (BE (tree == NULL, 0))
{
*err = REG_ESPACE;
return NULL;
}
- dfa->has_plural_match = 1;
}
return tree;
}
}
if (tree != NULL && exp != NULL)
{
- tree = create_tree (dfa, tree, exp, CONCAT, 0);
+ tree = create_tree (dfa, tree, exp, CONCAT);
if (tree == NULL)
{
*err = REG_ESPACE;
switch (token->type)
{
case CHARACTER:
- tree = re_dfa_add_tree_node (dfa, NULL, NULL, token);
+ tree = create_token_tree (dfa, NULL, NULL, token);
if (BE (tree == NULL, 0))
{
*err = REG_ESPACE;
{
bin_tree_t *mbc_remain;
fetch_token (token, regexp, syntax);
- mbc_remain = re_dfa_add_tree_node (dfa, NULL, NULL, token);
- tree = create_tree (dfa, tree, mbc_remain, CONCAT, 0);
+ mbc_remain = create_token_tree (dfa, NULL, NULL, token);
+ tree = create_tree (dfa, tree, mbc_remain, CONCAT);
if (BE (mbc_remain == NULL || tree == NULL, 0))
{
*err = REG_ESPACE;
return NULL;
}
dfa->used_bkref_map |= 1 << token->opr.idx;
- tree = re_dfa_add_tree_node (dfa, NULL, NULL, token);
+ tree = create_token_tree (dfa, NULL, NULL, token);
if (BE (tree == NULL, 0))
{
*err = REG_ESPACE;
token->type = CHARACTER;
/* mb_partial and word_char bits should be initialized already
by peek_token. */
- tree = re_dfa_add_tree_node (dfa, NULL, NULL, token);
+ tree = create_token_tree (dfa, NULL, NULL, token);
if (BE (tree == NULL, 0))
{
*err = REG_ESPACE;
if (token->opr.ctx_type == WORD_DELIM)
{
token->opr.ctx_type = WORD_FIRST;
- tree_first = re_dfa_add_tree_node (dfa, NULL, NULL, token);
+ tree_first = create_token_tree (dfa, NULL, NULL, token);
token->opr.ctx_type = WORD_LAST;
}
else
{
token->opr.ctx_type = INSIDE_WORD;
- tree_first = re_dfa_add_tree_node (dfa, NULL, NULL, token);
+ tree_first = create_token_tree (dfa, NULL, NULL, token);
token->opr.ctx_type = INSIDE_NOTWORD;
}
- tree_last = re_dfa_add_tree_node (dfa, NULL, NULL, token);
- token->type = OP_ALT;
- tree = re_dfa_add_tree_node (dfa, tree_first, tree_last, token);
+ tree_last = create_token_tree (dfa, NULL, NULL, token);
+ tree = create_tree (dfa, tree_first, tree_last, OP_ALT);
if (BE (tree_first == NULL || tree_last == NULL || tree == NULL, 0))
{
*err = REG_ESPACE;
}
else
{
- tree = re_dfa_add_tree_node (dfa, NULL, NULL, token);
+ tree = create_token_tree (dfa, NULL, NULL, token);
if (BE (tree == NULL, 0))
{
*err = REG_ESPACE;
fetch_token (token, regexp, syntax);
return tree;
case OP_PERIOD:
- tree = re_dfa_add_tree_node (dfa, NULL, NULL, token);
+ tree = create_token_tree (dfa, NULL, NULL, token);
if (BE (tree == NULL, 0))
{
*err = REG_ESPACE;
*err = REG_BADRPT;
return NULL;
}
- dfa->has_plural_match = 1;
}
return tree;
reg_errcode_t *err;
{
re_dfa_t *dfa = (re_dfa_t *) preg->buffer;
- bin_tree_t *tree, *left_par, *right_par;
+ bin_tree_t *tree;
size_t cur_nsub;
cur_nsub = preg->re_nsub++;
- left_par = re_dfa_add_tree_node (dfa, NULL, NULL, token);
- if (BE (left_par == NULL, 0))
- {
- *err = REG_ESPACE;
- return NULL;
- }
- dfa->nodes[left_par->node_idx].opr.idx = cur_nsub;
fetch_token (token, regexp, syntax | RE_CARET_ANCHORS_HERE);
/* The subexpression may be a null string. */
else
{
tree = parse_reg_exp (regexp, preg, token, syntax, nest, err);
- if (BE (*err != REG_NOERROR && tree == NULL, 0))
+ if (BE (*err == REG_NOERROR && token->type != OP_CLOSE_SUBEXP, 0))
+ *err = REG_EPAREN;
+ if (BE (*err != REG_NOERROR, 0))
return NULL;
}
- if (BE (token->type != OP_CLOSE_SUBEXP, 0))
- {
- *err = REG_EPAREN;
- return NULL;
- }
- right_par = re_dfa_add_tree_node (dfa, NULL, NULL, token);
dfa->completed_bkref_map |= 1 << cur_nsub;
- tree = ((tree == NULL) ? right_par
- : create_tree (dfa, tree, right_par, CONCAT, 0));
- tree = create_tree (dfa, left_par, tree, CONCAT, 0);
- if (BE (right_par == NULL || tree == NULL, 0))
+
+ tree = create_tree (dfa, tree, NULL, SUBEXP);
+ if (BE (tree == NULL, 0))
{
*err = REG_ESPACE;
return NULL;
}
- dfa->nodes[right_par->node_idx].opr.idx = cur_nsub;
-
+ tree->token.opr.idx = cur_nsub;
return tree;
}
reg_syntax_t syntax;
reg_errcode_t *err;
{
- re_token_t dup_token;
bin_tree_t *tree = NULL, *old_tree = NULL;
int i, start, end, start_idx = re_string_cur_idx (regexp);
re_token_t start_token = *token;
fetch_token (token, regexp, syntax);
- /* Treat "<re>{0}*" etc. as "<re>{0}". */
- if (BE (elem == NULL || (start == 0 && end == 0), 0))
+ if (BE (elem == NULL, 0))
return NULL;
+ if (BE (start == 0 && end == 0, 0))
+ {
+ postorder (elem, free_tree, NULL);
+ return NULL;
+ }
/* Extract "<re>{n,m}" to "<re><re>...<re><re>{0,<m-n>}". */
if (BE (start > 0, 0))
for (i = 2; i <= start; ++i)
{
elem = duplicate_tree (elem, dfa);
- tree = create_tree (dfa, tree, elem, CONCAT, 0);
+ tree = create_tree (dfa, tree, elem, CONCAT);
if (BE (elem == NULL || tree == NULL, 0))
goto parse_dup_op_espace;
}
else
old_tree = NULL;
- mark_opt_subexp (elem, dfa);
- dup_token.type = (end == -1 ? OP_DUP_ASTERISK : OP_DUP_QUESTION);
- tree = re_dfa_add_tree_node (dfa, elem, NULL, &dup_token);
+ if (elem->token.type == SUBEXP)
+ postorder (elem, mark_opt_subexp, (void *) (long) elem->token.opr.idx);
+
+ tree = create_tree (dfa, elem, NULL, (end == -1 ? OP_DUP_ASTERISK : OP_ALT));
if (BE (tree == NULL, 0))
goto parse_dup_op_espace;
for (i = start + 2; i <= end; ++i)
{
elem = duplicate_tree (elem, dfa);
- tree = create_tree (dfa, tree, elem, CONCAT, 0);
+ tree = create_tree (dfa, tree, elem, CONCAT);
if (BE (elem == NULL || tree == NULL, 0))
goto parse_dup_op_espace;
- tree = re_dfa_add_tree_node (dfa, tree, NULL, &dup_token);
+ tree = create_tree (dfa, tree, NULL, OP_ALT);
if (BE (tree == NULL, 0))
goto parse_dup_op_espace;
}
if (old_tree)
- tree = create_tree (dfa, old_tree, tree, CONCAT, 0);
+ tree = create_tree (dfa, old_tree, tree, CONCAT);
return tree;
/* Ensure only single byte characters are set. */
if (dfa->mb_cur_max > 1)
bitset_mask (sbcset, dfa->sb_char);
-#endif /* RE_ENABLE_I18N */
-
- /* Build a tree for simple bracket. */
- br_token.type = SIMPLE_BRACKET;
- br_token.opr.sbcset = sbcset;
- work_tree = re_dfa_add_tree_node (dfa, NULL, NULL, &br_token);
- if (BE (work_tree == NULL, 0))
- goto parse_bracket_exp_espace;
-#ifdef RE_ENABLE_I18N
if (mbcset->nmbchars || mbcset->ncoll_syms || mbcset->nequiv_classes
|| mbcset->nranges || (dfa->mb_cur_max > 1 && (mbcset->nchar_classes
|| mbcset->non_match)))
{
- re_token_t alt_token;
bin_tree_t *mbc_tree;
int sbc_idx;
/* Build a tree for complex bracket. */
dfa->has_mb_node = 1;
+ br_token.type = COMPLEX_BRACKET;
+ br_token.opr.mbcset = mbcset;
+ mbc_tree = create_token_tree (dfa, NULL, NULL, &br_token);
+ if (BE (mbc_tree == NULL, 0))
+ goto parse_bracket_exp_espace;
for (sbc_idx = 0; sbc_idx < BITSET_UINTS; ++sbc_idx)
if (sbcset[sbc_idx])
break;
/* If there are no bits set in sbcset, there is no point
of having both SIMPLE_BRACKET and COMPLEX_BRACKET. */
- if (sbc_idx == BITSET_UINTS)
+ if (sbc_idx < BITSET_UINTS)
+ {
+ /* Build a tree for simple bracket. */
+ br_token.type = SIMPLE_BRACKET;
+ br_token.opr.sbcset = sbcset;
+ work_tree = create_token_tree (dfa, NULL, NULL, &br_token);
+ if (BE (work_tree == NULL, 0))
+ goto parse_bracket_exp_espace;
+
+ /* Then join them by ALT node. */
+ work_tree = create_tree (dfa, work_tree, mbc_tree, OP_ALT);
+ if (BE (work_tree == NULL, 0))
+ goto parse_bracket_exp_espace;
+ }
+ else
{
re_free (sbcset);
- dfa->nodes[work_tree->node_idx].type = COMPLEX_BRACKET;
- dfa->nodes[work_tree->node_idx].opr.mbcset = mbcset;
- return work_tree;
+ work_tree = mbc_tree;
}
- br_token.type = COMPLEX_BRACKET;
- br_token.opr.mbcset = mbcset;
- mbc_tree = re_dfa_add_tree_node (dfa, NULL, NULL, &br_token);
- if (BE (mbc_tree == NULL, 0))
- goto parse_bracket_exp_espace;
- /* Then join them by ALT node. */
- alt_token.type = OP_ALT;
- dfa->has_plural_match = 1;
- work_tree = re_dfa_add_tree_node (dfa, work_tree, mbc_tree, &alt_token);
- if (BE (mbc_tree != NULL, 1))
- return work_tree;
}
else
{
+ /* Build a tree for simple bracket. */
+ br_token.type = SIMPLE_BRACKET;
+ br_token.opr.sbcset = sbcset;
+ work_tree = create_token_tree (dfa, NULL, NULL, &br_token);
+ if (BE (work_tree == NULL, 0))
+ goto parse_bracket_exp_espace;
+
free_charset (mbcset);
- return work_tree;
}
-#else /* not RE_ENABLE_I18N */
- return work_tree;
#endif /* not RE_ENABLE_I18N */
+ return work_tree;
parse_bracket_exp_espace:
*err = REG_ESPACE;
/* Build a tree for simple bracket. */
br_token.type = SIMPLE_BRACKET;
br_token.opr.sbcset = sbcset;
- tree = re_dfa_add_tree_node (dfa, NULL, NULL, &br_token);
+ tree = create_token_tree (dfa, NULL, NULL, &br_token);
if (BE (tree == NULL, 0))
goto build_word_op_espace;
#ifdef RE_ENABLE_I18N
if (dfa->mb_cur_max > 1)
{
- re_token_t alt_token;
bin_tree_t *mbc_tree;
/* Build a tree for complex bracket. */
br_token.type = COMPLEX_BRACKET;
br_token.opr.mbcset = mbcset;
dfa->has_mb_node = 1;
- mbc_tree = re_dfa_add_tree_node (dfa, NULL, NULL, &br_token);
+ mbc_tree = create_token_tree (dfa, NULL, NULL, &br_token);
if (BE (mbc_tree == NULL, 0))
goto build_word_op_espace;
/* Then join them by ALT node. */
- alt_token.type = OP_ALT;
- dfa->has_plural_match = 1;
- tree = re_dfa_add_tree_node (dfa, tree, mbc_tree, &alt_token);
+ tree = create_tree (dfa, tree, mbc_tree, OP_ALT);
if (BE (mbc_tree != NULL, 1))
return tree;
}
/* Create a tree node. */
static bin_tree_t *
-create_tree (dfa, left, right, type, index)
+create_tree (dfa, left, right, type)
re_dfa_t *dfa;
bin_tree_t *left;
bin_tree_t *right;
re_token_type_t type;
- int index;
+{
+ re_token_t t;
+ t.type = type;
+ return create_token_tree (dfa, left, right, &t);
+}
+
+static bin_tree_t *
+create_token_tree (dfa, left, right, token)
+ re_dfa_t *dfa;
+ bin_tree_t *left;
+ bin_tree_t *right;
+ const re_token_t *token;
{
bin_tree_t *tree;
if (BE (dfa->str_tree_storage_idx == BIN_TREE_STORAGE_SIZE, 0))
tree->parent = NULL;
tree->left = left;
tree->right = right;
- tree->type = type;
- tree->node_idx = index;
- tree->first = -1;
- tree->next = -1;
- re_node_set_init_empty (&tree->eclosure);
+ tree->token = *token;
+ tree->token.duplicated = 0;
+ tree->token.opt_subexp = 0;
+ tree->first = NULL;
+ tree->next = NULL;
+ tree->node_idx = -1;
if (left != NULL)
left->parent = tree;
return tree;
}
-/* Create both a DFA node and a tree for it. */
+/* Mark the tree SRC as an optional subexpression.
+ To be called from preorder or postorder. */
-static bin_tree_t *
-re_dfa_add_tree_node (dfa, left, right, token)
- re_dfa_t *dfa;
- bin_tree_t *left;
- bin_tree_t *right;
- const re_token_t *token;
+static reg_errcode_t
+mark_opt_subexp (extra, node)
+ void *extra;
+ bin_tree_t *node;
{
- int new_idx = re_dfa_add_node (dfa, *token, 0);
-
- if (new_idx == -1)
- return NULL;
+ int idx = (int) (long) extra;
+ if (node->token.type == SUBEXP && node->token.opr.idx == idx)
+ node->token.opt_subexp = 1;
- return create_tree (dfa, left, right, 0, new_idx);
+ return REG_NOERROR;
}
-/* Mark the tree SRC as an optional subexpression. */
+/* Free the allocated memory inside NODE. */
static void
-mark_opt_subexp (src, dfa)
- const bin_tree_t *src;
- re_dfa_t *dfa;
+free_token (re_token_t *node)
{
- /* Pass an OPT_SUBEXP_IDX which is != 1 if the duplicated tree is
- a subexpression. */
- if (src->type == CONCAT
- && src->left->type == NON_TYPE
- && dfa->nodes[src->left->node_idx].type == OP_OPEN_SUBEXP)
- mark_opt_subexp_iter (src, dfa, dfa->nodes[src->left->node_idx].opr.idx);
+#ifdef RE_ENABLE_I18N
+ if (node->type == COMPLEX_BRACKET && node->duplicated == 0)
+ free_charset (node->opr.mbcset);
+ else
+#endif /* RE_ENABLE_I18N */
+ if (node->type == SIMPLE_BRACKET && node->duplicated == 0)
+ re_free (node->opr.sbcset);
}
+/* Worker function for tree walking. Free the allocated memory inside NODE
+ and its children. */
-/* Recursive tree walker for mark_opt_subexp. */
-
-static void
-mark_opt_subexp_iter (src, dfa, idx)
- const bin_tree_t *src;
- re_dfa_t *dfa;
- int idx;
+static reg_errcode_t
+free_tree (void *extra, bin_tree_t *node)
{
- int node_idx;
-
- if (src->type == NON_TYPE)
- {
- node_idx = src->node_idx;
- if ((dfa->nodes[node_idx].type == OP_OPEN_SUBEXP
- || dfa->nodes[node_idx].type == OP_CLOSE_SUBEXP)
- && dfa->nodes[node_idx].opr.idx == idx)
- dfa->nodes[node_idx].opt_subexp = 1;
- }
-
- if (src->left != NULL)
- mark_opt_subexp_iter (src->left, dfa, idx);
-
- if (src->right != NULL)
- mark_opt_subexp_iter (src->right, dfa, idx);
+ free_token (&node->token);
+ return REG_NOERROR;
}
-/* Duplicate the node SRC, and return new node. */
+/* Duplicate the node SRC, and return new node. This is a preorder
+ visit similar to the one implemented by the generic visitor, but
+ we need more infrastructure to maintain two parallel trees --- so,
+ it's easier to duplicate. */
static bin_tree_t *
-duplicate_tree (src, dfa)
- const bin_tree_t *src;
+duplicate_tree (root, dfa)
+ const bin_tree_t *root;
re_dfa_t *dfa;
{
- bin_tree_t *left = NULL, *right = NULL, *new_tree;
- int new_node_idx;
- /* Since node indies must be according to Post-order of the tree,
- we must duplicate the left at first. */
- if (src->left != NULL)
- {
- left = duplicate_tree (src->left, dfa);
- if (left == NULL)
- return NULL;
- }
+ const bin_tree_t *node;
+ bin_tree_t *dup_root;
+ bin_tree_t **p_new = &dup_root, *dup_node = root->parent;
- /* Secondaly, duplicate the right. */
- if (src->right != NULL)
+ for (node = root; ; )
{
- right = duplicate_tree (src->right, dfa);
- if (right == NULL)
+ /* Create a new tree and link it back to the current parent. */
+ *p_new = create_token_tree (dfa, NULL, NULL, &node->token);
+ if (*p_new == NULL)
return NULL;
- }
+ (*p_new)->parent = dup_node;
+ (*p_new)->token.duplicated = 1;
+ dup_node = *p_new;
- /* At last, duplicate itself. */
- if (src->type == NON_TYPE)
- {
- new_node_idx = re_dfa_add_node (dfa, dfa->nodes[src->node_idx], 0);
- dfa->nodes[new_node_idx].duplicated = 1;
- if (BE (new_node_idx == -1, 0))
- return NULL;
+ /* Go to the left node, or up and to the right. */
+ if (node->left)
+ {
+ node = node->left;
+ p_new = &dup_node->left;
+ }
+ else
+ {
+ const bin_tree_t *prev = NULL;
+ while (node->right == prev || node->right == NULL)
+ {
+ prev = node;
+ node = node->parent;
+ dup_node = dup_node->parent;
+ if (!node)
+ return dup_root;
+ }
+ node = node->right;
+ p_new = &dup_node->right;
+ }
}
- else
- new_node_idx = src->type;
-
- new_tree = create_tree (dfa, left, right, src->type, new_node_idx);
- return new_tree;
}
projects / external / glibc.git / commitdiff