/*
* FML interpreter. Europagate, 1995
*
- * fmlstr.c,v
+ * $Log: fmlstr.c,v $
+ * Revision 1.4 1995/02/27 09:01:21 adam
+ * Regular expression support. Argument passing by name option. New FML
+ * function strlen.
+ *
+ * Revision 1.3 1995/02/23 08:32:06 adam
+ * Changed header.
+ *
* Revision 1.1 1995/02/10 18:15:53 adam
* FML function 'strcmp' implemented. This function can be used to
* test for existence of MARC fields.
#include "fmlp.h"
+#if USE_GNU_REGEX
+#include <regex.h>
+#endif
+
+#if USE_GNU_REGEX
+struct reg_cache {
+ struct re_pattern_buffer buf;
+ char *pattern;
+ struct reg_cache *next;
+};
+
+static int no_in_use = 0;
+static struct reg_cache *reg_cache_list = NULL;
+
+struct reg_cache *fml_reg_compile (const char *pattern)
+{
+ struct reg_cache *list, *last = NULL;
+ for (list = reg_cache_list; list; list = list->next)
+ {
+ if (!strcmp (pattern, list->pattern))
+ return list;
+ last = list;
+ }
+ if (no_in_use >= 20)
+ {
+ for (list = reg_cache_list; list->next->next; list = list->next)
+ ;
+ free (list->next->pattern);
+ regfree (&list->next->buf);
+ free (list->next);
+ list->next = NULL;
+ }
+ else
+ no_in_use++;
+ list = malloc (sizeof (*list));
+ assert (list);
+ list->next = reg_cache_list;
+ reg_cache_list = list;
+ list->pattern = malloc (strlen(pattern)+1);
+ assert (list->pattern);
+ strcpy (list->pattern, pattern);
+
+ re_syntax_options = RE_SYNTAX_GREP;
+ list->buf.translate = NULL;
+ list->buf.fastmap = NULL;
+ list->buf.buffer = NULL;
+ list->buf.allocated = 0;
+ re_compile_pattern (pattern, strlen(pattern), &list->buf);
+ return list;
+}
+
+static int fml_reg_match (struct reg_cache *reg_pat, const char *str)
+{
+ int ret, len = strlen (str);
+
+ ret = re_match (®_pat->buf, str, len, 0, NULL);
+ if (ret == len)
+ return 1;
+ return 0;
+}
+
+#endif
+
+static struct fml_node *fml_exec_match (Fml fml, struct fml_node **lp,
+ struct token *tp)
+{
+ struct reg_cache *reg;
+ struct fml_node *fn;
+ const char *cp;
+ char pattern[128];
+ char sstring[128];
+
+ fml_cmd_lex (lp, tp);
+ if (tp->kind == 't')
+ {
+ cp = tp->tokenbuf;
+ fml_cmd_lex (lp, tp);
+ }
+ else
+ {
+ fn = fml_expr_term (fml, lp, tp);
+ if (!fn->is_atom)
+ {
+ fml_node_delete (fml, fn);
+ return NULL;
+ }
+ fml_atom_str (fn->p[0], pattern);
+ fml_node_delete (fml, fn);
+ cp = pattern;
+ }
+ reg = fml_reg_compile (cp);
+ fn = fml_expr_term (fml, lp, tp);
+ if (!fn->is_atom)
+ {
+ fml_node_delete (fml, fn);
+ return NULL;
+ }
+ fml_atom_str (fn->p[0], sstring);
+ fml_node_delete (fml, fn);
+ if (fml_reg_match (reg, sstring))
+ return fml_mk_node_val (fml, 1);
+ return NULL;
+}
+
+static struct fml_node *fml_exec_strlen (Fml fml, struct fml_node **lp,
+ struct token *tp)
+{
+ struct fml_node *fn;
+ int len = 0;
+
+ fml_cmd_lex (lp, tp);
+ fn = fml_expr_term (fml, lp, tp);
+ while (fn)
+ {
+ if (fn->is_atom)
+ len += fml_atom_len (fn->p[0]);
+ fn = fn->p[1];
+ if (fn)
+ len++;
+ }
+ fml_node_delete (fml, fn);
+ return fml_mk_node_val (fml, len);
+}
+
static struct fml_node *fml_exec_strcmp (Fml fml, struct fml_node **lp,
struct token *tp)
{
arg = "1";
else
arg = "-1";
+ fml_node_delete (fml, fn1);
+ fml_node_delete (fml, fn2);
fn = fml_node_alloc (fml);
fn->is_atom = 1;
fn->p[0] = fml_atom_alloc (fml, arg);
sym_info = fml_sym_add (fml->sym_tab, "strcmp");
sym_info->kind = FML_CPREFIX;
sym_info->prefix = fml_exec_strcmp;
+ sym_info = fml_sym_add (fml->sym_tab, "strlen");
+ sym_info->kind = FML_CPREFIX;
+ sym_info->prefix = fml_exec_strlen;
+#if USE_GNU_REGEX
+ sym_info = fml_sym_add (fml->sym_tab, "match");
+ sym_info->kind = FML_CPREFIX;
+ sym_info->prefix = fml_exec_match;
+#endif
}