fst-infl2-daemon.C
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/*******************************************************************/
/* */
/* FILE fst-infl2.C */
/* MODULE fst-infl2 */
/* PROGRAM SFST */
/* AUTHOR Helmut Schmid, IMS, University of Stuttgart */
/* */
/*******************************************************************/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "Socket.h"
#include "compact.h"
using std::vector;
using std::cerr;
const int BUFFER_SIZE=1000;
bool Verbose=true;
bool Disambiguate=false;
bool BothLayers=false;
bool PrintProbs=false;
vector<char*> Filenames;
double Threshold=1.0;
float MaxError=0.0;
vector<CompactTransducer*> transducer;
/*******************************************************************/
/* */
/* usage */
/* */
/*******************************************************************/
void usage()
{
cerr << "\nUsage: fst-infl2 [options] <socket-no> file\n\n";
cerr << "Options:\n";
cerr << "-d: disambiguate symbolically (print the simplest analyses)\n";
cerr << "-e n: robust matching (up to n errors allowed)\n";
cerr << "-% f: disambiguate statistically (print best analyses up to a total probability of f %).\n";
cerr << "-b: print analysis and surface characters\n";
cerr << "-p: print probabilities\n";
cerr << "-t tfile: alternative transducer\n";
cerr << "-c: read transducer with an opposite-endian encoding (Sparc <=> Pentium)\n";
cerr << "-q: suppress status messages\n";
cerr << "-h: print this message\n";
cerr << "\nThe names of the probability files required by option -p and -% are are\nobtained by adding .prob to the transducer file names.\n\n";
exit(1);
}
/*******************************************************************/
/* */
/* get_flags */
/* */
/*******************************************************************/
void get_flags( int *argc, char **argv )
{
for( int i=1; i<*argc; i++ ) {
if (strcmp(argv[i],"-d") == 0) {
Disambiguate = true;
argv[i] = NULL;
}
else if (strcmp(argv[i],"-b") == 0) {
BothLayers = true;
argv[i] = NULL;
}
else if (strcmp(argv[i],"-p") == 0) {
PrintProbs = true;
argv[i] = NULL;
}
else if (strcmp(argv[i],"-c") == 0) {
Switch_Bytes = true;
argv[i] = NULL;
}
else if (strcmp(argv[i],"-q") == 0) {
Verbose = false;
argv[i] = NULL;
}
else if (strcmp(argv[i],"-h") == 0) {
usage();
argv[i] = NULL;
}
else if (i < *argc-1) {
if (strcmp(argv[i],"-t") == 0) {
Filenames.push_back(argv[i+1]);
argv[i] = NULL;
argv[++i] = NULL;
}
else if (strcmp(argv[i],"-%") == 0) {
errno = 0;
if ((Threshold = atof(argv[i+1])), errno) {
fprintf(stderr,"Invalid argument of option -%%: %s\n", argv[i+1]);
exit(1);
}
if (Threshold <= 0.0 || Threshold > 100.0) {
fprintf(stderr,"Argument of option -%% is out of range: %s\n",
argv[i+1]);
exit(1);
}
Threshold *= 0.01;
argv[i] = NULL;
argv[++i] = NULL;
}
else if (strcmp(argv[i],"-e") == 0) {
errno = 0;
if ((MaxError = atof(argv[i+1])), errno) {
fprintf(stderr,"Invalid argument of option -e: %s\n", argv[i+1]);
exit(1);
}
if (MaxError <= 0.0) {
fprintf(stderr,"Argument of option -e is out of range: %s\n",
argv[i+1]);
exit(1);
}
argv[i] = NULL;
argv[++i] = NULL;
}
}
}
// remove flags from the argument list
int k;
for( int i=k=1; i<*argc; i++)
if (argv[i] != NULL)
argv[k++] = argv[i];
*argc = k;
}
/*******************************************************************/
/* */
/* next_token */
/* */
/*******************************************************************/
char *next_token( int sockfd )
{
static char buffer[10000];
static int pos = 0;
static int last = 0;
vector<char> token;
for(;;) {
while (pos < last) {
token.push_back(buffer[pos]);
if (buffer[pos++] == '\n') {
token.back() = 0;
return strdup(&token[0]);
}
}
pos = 0;
last = read( sockfd, buffer, 10000 );
if (last <= 0) {
if (token.size() > 0) {
token.push_back(0);
return strdup(&token[0]);
}
return NULL;
}
}
}
/*******************************************************************/
/* */
/* annotate_data */
/* */
/*******************************************************************/
void annotate_data( int sockfd )
{
char *word;
vector<CAnalysis> analyses;
char buffer[10000];
while ((word = next_token( sockfd )) != NULL) {
sprintf(buffer, "> %s\n", word);
write( sockfd, buffer, strlen(buffer) );
for( size_t i=0; i<transducer.size(); i++ ) {
transducer[i]->analyze_string(word, analyses);
if (analyses.size() == 0 && MaxError > 0.0)
transducer[i]->robust_analyze_string(word, analyses, MaxError);
if (analyses.size() > 0) {
if (Threshold != 1.0 || PrintProbs) {
vector<double> prob;
transducer[i]->compute_probs( analyses, prob );
double sum=0.0;
for( size_t k=0; k<analyses.size(); k++ ) {
char *s = transducer[i]->print_analysis(analyses[k]);
write( sockfd, s, strlen(s) );
if (PrintProbs) {
sprintf(buffer,"\t%f", prob[k]);
write( sockfd, buffer, strlen(buffer) );
}
buffer[0] = '\n';
write( sockfd, buffer, 1 );
sum += prob[k];
if (sum > 0.0 && sum >= Threshold &&
(k==analyses.size() || prob[k] > prob[k+1]))
break;
}
}
else
for( size_t k=0; k<analyses.size(); k++ ) {
char *s = transducer[i]->print_analysis(analyses[k]);
write( sockfd, s, strlen(s) );
buffer[0] = '\n';
write( sockfd, buffer, 1 );
}
break;
}
}
if (analyses.size() == 0) {
sprintf(buffer, "no result for %s\n", word);
write( sockfd, buffer, strlen(buffer) );
}
}
}
/*******************************************************************/
/* */
/* main */
/* */
/*******************************************************************/
int main( int argc, char **argv )
{
FILE *file;
get_flags(&argc, argv);
if (argc != 3)
usage();
int socketno=atoi(argv[1]);
if (socketno < 1024 || socketno > 49152) {
fprintf(stderr,"Error: invalid socket number \"%s\"!\n", argv[1]);
exit(1);
}
Filenames.push_back(argv[2]);
try {
for( size_t i=0; i<Filenames.size(); i++ ) {
if ((file = fopen(Filenames[i],"rb")) == NULL) {
fprintf(stderr, "\nError: Cannot open transducer file %s\n\n",
Filenames[i]);
exit(1);
}
if (Verbose)
cerr << "reading transducer from file \"" << Filenames[i] <<"\"...\n";
if (Threshold != 1.0 || PrintProbs) {
FILE *pfile;
char buffer[1000];
sprintf(buffer, "%s.prob", Filenames[i]);
if ((pfile = fopen(buffer,"rb")) == NULL) {
fprintf(stderr, "\nError: Cannot open probability file %s.prob\n\n",
Filenames[i]);
exit(1);
}
transducer.push_back(new CompactTransducer(file, pfile));
fclose(pfile);
}
else
transducer.push_back(new CompactTransducer(file));
transducer[i]->both_layers = BothLayers;
transducer[i]->simplest_only = Disambiguate;
fclose(file);
if (Verbose)
cerr << "finished.\n";
}
Socket socket( socketno );
fprintf(stderr, "listening to the socket ...");
for(;;) {
/* wait for the next client */
int sockfd = socket.next_client();
if (sockfd < 0) {
fprintf(stderr, "ERROR on accept\n");
return 1;
}
annotate_data( sockfd );
shutdown( sockfd, SHUT_RDWR );
}
}
catch (const char *p) {
cerr << p << "\n";
return 1;
}
if (Verbose)
fprintf(stderr, " finished\n");
return 0;
}