/* -*-c-*-
- *
- * $Id: anag.c,v 1.6 2003/09/15 02:48:54 mdw Exp $
*
* Main driver for anag
*
* (c) 2001 Mark Wooding
*/
-/*----- Licensing notice --------------------------------------------------*
+/*----- Licensing notice --------------------------------------------------*
*
* This file is part of Anag: a simple wordgame helper.
*
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
- *
+ *
* Anag 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 General Public License for more details.
- *
+ *
* You should have received a copy of the GNU General Public License
* along with Anag; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
-/*----- Revision history --------------------------------------------------*
- *
- * $Log: anag.c,v $
- * Revision 1.6 2003/09/15 02:48:54 mdw
- * Monoalphabetic match filter.
- *
- * Revision 1.5 2002/08/11 12:58:09 mdw
- * Added support for regular expression matching, if supported by the C
- * library.
- *
- * Revision 1.4 2001/02/19 19:18:50 mdw
- * Minor big fixes to parser.
- *
- * Revision 1.3 2001/02/16 21:45:19 mdw
- * Be more helpful. Improve full help message. Special-case error for
- * empty command strings.
- *
- * Revision 1.2 2001/02/07 09:09:11 mdw
- * Fix spurious error when `-file' is used.
- *
- * Revision 1.1 2001/02/04 17:14:42 mdw
- * Initial checkin
- *
- */
-
/*----- Header files ------------------------------------------------------*/
#include "anag.h"
/*----- Help text functions -----------------------------------------------*/
static void usage(FILE *fp)
-{
- pquis(fp, "Usage: $ [-f file] expression\n");
-}
+ { pquis(fp, "Usage: $ [-f file] expression\n"); }
static void version(FILE *fp)
-{
- pquis(fp, "$, version " VERSION "\n");
-}
+ { pquis(fp, "$, version " VERSION "\n"); }
static void help(FILE *fp)
{
-regexp REGEXP matches with an (extended) regular expression\n\
"
#endif
+#if defined(HAVE_PCRE) || defined(HAVE_PCRE2)
+"\
+-pcre REGEXP matches with a Perl-like regular expression\n\
+"
+#endif
"\
+-length [+|-]N matches if length is [at least|at most] N\n\
+-longest output longest matches found here\n\
+-shortest output shortest matches found here\n\
\n\
These simple tests can be combined using the operators `-a', `-o' and `-n'\n\
(for `and', `or' and `not'; they may also be written `&', `|' and `!' if\n\
you like), and grouped using parentheses `(' and `)'.\n\
-", fp);
+", fp); /*"*/
}
/*----- The options parser ------------------------------------------------*/
O_HELP, O_VERSION, O_USAGE,
O_FILE,
O_AND, O_OR, O_NOT, O_LPAREN, O_RPAREN,
- O_ANAG, O_SUBG, O_WILD, O_TRACK, O_REGEXP, O_MONO,
+ O_ANAG, O_SUBG, O_WILD, O_TRACK, O_REGEXP, O_PCRE, O_MONO, O_LENGTH,
+ O_LONGEST, O_SHORTEST,
O_EOF
};
{ "or", 0, OF_SHORT, O_OR },
{ "not", 0, OF_SHORT, O_NOT },
- /* --- Actual matching oeprations -- do something useful --- */
+ /* --- Actual matching operations -- do something useful --- */
{ "anagram", 1, 0, O_ANAG },
{ "subgram", 1, 0, O_SUBG },
#ifdef HAVE_REGCOMP
{ "regexp", 1, 0, O_REGEXP },
#endif
+#if defined(HAVE_PCRE) || defined(HAVE_PCRE2)
+ { "pcre", 1, 0, O_PCRE },
+#endif
+ { "length", 1, 0, O_LENGTH },
+ { "longest", 0, 0, O_LONGEST },
+ { "shortest", 0, 0, O_SHORTEST },
/* --- End marker --- */
size_t sz;
const char *p;
- /* --- Pick the next option off the front --- */
-
+ /* Pick the next option off the front. */
*arg = av + ai;
- if (ai >= ac)
- return (O_EOF);
+ if (ai >= ac) return (O_EOF);
p = av[ai++];
- /* --- Cope with various forms of magic --- */
-
+ /* Cope with various forms of magic. */
if (p[0] != '-') {
if (!p[1]) switch (*p) {
case '&': return (O_AND);
goto bad;
}
- /* --- Now cope with other sorts of weirdies --- *
- *
- * By the end of this, a leading `-' or `--' will have been stripped.
+ /* Now cope with other sorts of weirdies. By the end of this, a leading
+ * `-' or `--' will have been stripped.
*/
-
p++;
- if (!*p)
- goto bad;
- if (*p == '-')
- p++;
+ if (!*p) goto bad;
+ if (*p == '-') p++;
if (!*p) {
- if (ai < ac)
- die("syntax error near `--': rubbish at end of line");
+ if (ai < ac) die("syntax error near `--': rubbish at end of line");
return (O_EOF);
}
- /* --- Now look the word up in my table --- */
-
+ /*Now look the word up in my table. */
sz = strlen(p);
oo = 0;
for (o = opttab; o->name; o++) {
if (strncmp(p, o->name, sz) == 0) {
- if (strlen(o->name) == sz || ((o->f & OF_SHORT) && sz == 1)) {
- oo = o;
- break;
- }
- if (oo) {
+ if (strlen(o->name) == sz || ((o->f & OF_SHORT) && sz == 1))
+ { oo = o; break; }
+ if (oo)
die("ambiguous option name `-%s' (could match `-%s' or `-%s')",
p, oo->name, o->name);
- }
oo = o;
}
}
- if (!oo)
- die("unrecognized option name `-%s'", p);
-
- /* --- Sort out the arguments --- */
+ if (!oo) die("unrecognized option name `-%s'", p);
+ /* Sort out the arguments. */
if (ai + oo->nargs > ac)
die("too few arguments for `-%s' (need %u)", oo->name, oo->nargs);
ai += oo->nargs;
- /* --- Now process the option --- */
-
+ /* Now process the option. */
switch (oo->tag) {
- case O_HELP:
- help(stdout);
- exit(0);
- case O_VERSION:
- version(stdout);
- exit(0);
- case O_USAGE:
- usage(stdout);
- exit(0);
- case O_FILE:
- file = (*arg)[1];
- break;
- default:
- return (oo->tag);
+ case O_HELP: help(stdout); exit(0);
+ case O_VERSION: version(stdout); exit(0);
+ case O_USAGE: usage(stdout); exit(0);
+ case O_FILE: file = (*arg)[1]; break;
+ default: return (oo->tag);
}
continue;
bad:
return (!n->arg->func(n->arg, p, sz));
}
+/*----- Other simple node types -------------------------------------------*/
+
+enum { LESS = -1, EQUAL = 0, GREATER = 1 };
+
+typedef struct node_numeric {
+ node n;
+ int dir;
+ int i;
+} node_numeric;
+
+static void parse_numeric(const char *p, int *dir, int *i)
+{
+ long l;
+ const char *pp = p;
+ char *q;
+
+ switch (*pp) {
+ case '-': *dir = LESS; pp++; break;
+ case '+': *dir = GREATER; pp++; break;
+ default: *dir = EQUAL; break;
+ }
+ errno = 0;
+ l = strtol(pp, &q, 0);
+ if (*q || errno || l < INT_MIN || l > INT_MAX)
+ die("bad numeric parameter `%s'", p);
+ *i = l;
+}
+
+static node *make_numeric(const char *const *av,
+ int (*func)(struct node *, const char *, size_t))
+{
+ node_numeric *n = xmalloc(sizeof(*n));
+ parse_numeric(av[0], &n->dir, &n->i);
+ n->n.func = func;
+ return (&n->n);
+}
+
+static int cmp_numeric(int x, int dir, int n)
+{
+ switch (dir) {
+ case LESS: return (x <= n);
+ case EQUAL: return (x == n);
+ case GREATER: return (x >= n);
+ }
+ abort();
+}
+
+static int n_length(node *nn, const char *p, size_t sz)
+{
+ node_numeric *n = (node_numeric *)nn;
+ return (cmp_numeric(sz, n->dir, n->i));
+}
+
/*----- Parser for the expression syntax ----------------------------------*/
/* --- A parser context --- */
{
static const char *const eof[] = { "<end>", 0 };
p->t = nextopt(&p->a);
- if (p->t == O_EOF)
- p->a = eof;
+ if (p->t == O_EOF) p->a = eof;
}
static void p_factor(p_ctx *p, node **nn)
if (p->t == O_LPAREN) {
p_next(p);
p_expr(p, nn);
- if (p->t != O_RPAREN)
- die("syntax error near `%s': missing `)'", *p->a);
+ if (p->t != O_RPAREN) die("syntax error near `%s': missing `)'", *p->a);
p_next(p);
} else if (p->t == O_NOT) {
n = xmalloc(sizeof(node_un));
case O_TRACK: *nn = trackword(p->a + 1); break;
#ifdef HAVE_REGCOMP
case O_REGEXP: *nn = regexp(p->a + 1); break;
+#endif
+#if defined(HAVE_PCRE) || defined(HAVE_PCRE2)
+ case O_PCRE: *nn = pcrenode(p->a + 1); break;
#endif
case O_MONO: *nn = mono(p->a + 1); break;
+ case O_LENGTH: *nn = make_numeric(p->a + 1, n_length); break;
+ case O_LONGEST: *nn = longest(p->a + 1); break;
+ case O_SHORTEST: *nn = shortest(p->a + 1); break;
default: die("syntax error near `%s': unexpected token", *p->a);
}
p_next(p);
for (;;) {
p_factor(p, nn);
switch (p->t) {
- case O_AND:
- p_next(p);
- default:
- break;
- case O_RPAREN:
- case O_OR:
- case O_EOF:
- return;
+ case O_AND: p_next(p); break;
+ default: break;
+ case O_RPAREN: case O_OR: case O_EOF: return;
}
n = xmalloc(sizeof(node_bin));
n->left = *nn;
node_bin *n;
for (;;) {
p_term(p, nn);
- if (p->t != O_OR)
- break;
+ if (p->t != O_OR) break;
p_next(p);
n = xmalloc(sizeof(node_bin));
n->left = *nn;
exit(EXIT_FAILURE);
}
p_expr(&p, &n);
- if (p.t != O_EOF) {
+ if (p.t != O_EOF)
die("syntax error near `%s': rubbish at end of line (too many `)'s?)",
*p.a);
- }
return (n);
}
+/*----- At-end stuff ------------------------------------------------------*/
+
+/* --- @atend_register@ --- *
+ *
+ * Arguments: @int (*func)(void *)@ = function to call
+ * @void *p@ = handle to pass to it
+ *
+ * Returns: ---
+ *
+ * Use: Adds a function to the list of things to do at the end of the
+ * program. The function should return nonzero if it produced
+ * any output.
+ */
+
+typedef struct atend {
+ struct atend *next;
+ int (*func)(void */*p*/);
+ void *p;
+} atend;
+
+static atend *aa_head = 0, **aa_tail = &aa_head;
+
+void atend_register(int (*func)(void */*p*/), void *p)
+{
+ atend *a = xmalloc(sizeof(*a));
+ a->next = 0;
+ a->func = func;
+ a->p = p;
+ *aa_tail = a;
+ aa_tail = &a->next;
+}
+
/*----- Main code ---------------------------------------------------------*/
/* --- @main@ --- *
node *n;
FILE *fp;
dstr d = DSTR_INIT;
+ int ok = 0;
char *p, *q, *l;
+ atend *a;
ego(argv[0]);
n = p_argv(argc, (const char *const *)argv);
die("error opening `%s': %s", file, strerror(errno));
for (;;) {
dstr_reset(&d);
- if (dstr_putline(&d, fp) < 0)
- break;
+ if (dstr_putline(&d, fp) < 0) break;
l = d.buf + d.len;
for (p = q = d.buf; p < l; p++) {
- if (!isalnum((unsigned char)*p))
- continue;
+ if (!isalnum((unsigned char)*p)) continue;
*q++ = tolower((unsigned char)*p);
}
*q = 0;
if (n->func(n, d.buf, d.len)) {
fwrite(d.buf, 1, d.len, stdout);
fputc('\n', stdout);
+ ok = 1;
}
}
- if (!feof(fp))
+ if (ferror(fp) || fclose(fp))
die("error reading `%s': %s", file, strerror(errno));
- fclose(fp);
- return (0);
+ for (a = aa_head; a; a = a->next)
+ if (a->func(a->p)) ok = 1;
+ if (fflush(stdout) || ferror(stdout) || fclose(stdout))
+ die("error writing output: %s", strerror(errno));
+ if (!ok) pquis(stderr, "$: no matches found\n");
+ return (ok ? EX_OK : EX_NONE);
}
/*----- That's all, folks -------------------------------------------------*/
~mdw / anag / blobdiff