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/* This is a simple program which uses libstemmer to provide a command
* line interface for stemming using any of the algorithms provided.
*/
#include <stdio.h>
#include <stdlib.h> /* for malloc, free */
#include <string.h> /* for memmove */
#include <ctype.h> /* for isupper, tolower */
#include "libstemmer.h"
const char * progname;
static int pretty = 1;
static void
stem_file(struct sb_stemmer * stemmer, FILE * f_in, FILE * f_out)
{
#define INC 10
int lim = INC;
sb_symbol * b = (sb_symbol *) malloc(lim * sizeof(sb_symbol));
while(1) {
int ch = getc(f_in);
if (ch == EOF) {
free(b); return;
}
{
int i = 0;
while(1) {
if (ch == '\n' || ch == EOF) break;
if (i == lim) {
sb_symbol * newb;
newb = (sb_symbol *)
realloc(b, (lim + INC) * sizeof(sb_symbol));
if (newb == 0) goto error;
b = newb;
lim = lim + INC;
}
/* force lower case: */
if isupper(ch) ch = tolower(ch);
b[i] = ch;
i++;
ch = getc(f_in);
}
if (pretty) {
int j;
for (j = 0; j < i; j++) fprintf(f_out, "%c", b[j]);
fprintf(f_out, "%s", " -> ");
}
{
const sb_symbol * stemmed = sb_stemmer_stem(stemmer, b, i);
if (stemmed == NULL)
{
fprintf(stderr, "Out of memory");
exit(1);
}
else
{
int j;
/*for (j = 0; j < z->l; j++) */
for (j = 0; stemmed[j] != 0; j++)
fprintf(f_out, "%c", stemmed[j]);
fprintf(f_out, "\n");
}
}
}
}
error:
if (b != 0) free(b);
return;
}
/** Display the command line syntax, and then exit.
* @param n The value to exit with.
*/
static void
usage(int n)
{
printf("usage: %s [-l <language>] [-i <input file>] [-o <output file>] [-p] [-h]\n"
"\n"
"The input file consists of a list of words to be stemmed, one per\n"
"line. Words should be in lower case, but (for English) A-Z letters\n"
"are mapped to their a-z equivalents anyway. If omitted, stdin is\n"
"used.\n"
"\n"
"If -p is given the output file consists of each word of the input\n"
"file followed by \"->\" followed by its stemmed equivalent.\n"
"Otherwise, the output file consists of the stemmed words, one per\n"
"line.\n"
"\n"
"-h displays this help\n",
progname);
exit(n);
}
int
main(int argc, char * argv[])
{
char * in = 0;
char * out = 0;
FILE * f_in;
FILE * f_out;
struct sb_stemmer * stemmer;
char * language = "english";
char * s;
int i = 1;
pretty = 0;
progname = argv[0];
while(i < argc) {
s = argv[i++];
if (s[0] == '-') {
if (strcmp(s, "-o") == 0) {
if (i >= argc) {
fprintf(stderr, "%s requires an argument\n", s);
exit(1);
}
out = argv[i++];
} else if (strcmp(s, "-i") == 0) {
if (i >= argc) {
fprintf(stderr, "%s requires an argument\n", s);
exit(1);
}
in = argv[i++];
} else if (strcmp(s, "-l") == 0) {
if (i >= argc) {
fprintf(stderr, "%s requires an argument\n", s);
exit(1);
}
language = argv[i++];
} else if (strcmp(s, "-p") == 0) {
pretty = 1;
} else if (strcmp(s, "-h") == 0) {
usage(0);
} else {
fprintf(stderr, "option %s unknown\n", s);
usage(1);
}
} else {
fprintf(stderr, "unexpected parameter %s\n", s);
usage(1);
}
}
/* prepare the files */
f_in = (in == 0) ? stdin : fopen(in, "r");
if (f_in == 0) {
fprintf(stderr, "file %s not found\n", in);
exit(1);
}
f_out = (out == 0) ? stdout : fopen(out, "w");
if (f_out == 0) {
fprintf(stderr, "file %s cannot be opened\n", out);
exit(1);
}
/* do the stemming process: */
stemmer = sb_stemmer_new(language);
if (stemmer == 0) {
fprintf(stderr, "language `%s' not available for stemming\n", language);
exit(1);
}
stem_file(stemmer, f_in, f_out);
sb_stemmer_delete(stemmer);
if (in != 0) (void) fclose(f_in);
if (out != 0) (void) fclose(f_out);
return 0;
}
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