lyx_mirror/src/ispell.C
Lars Gullik Bjønnes c38370d1c3 the exception safety patch
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@8020 a592a061-630c-0410-9148-cb99ea01b6c8
2003-11-03 17:47:28 +00:00

447 lines
8.8 KiB
C

/**
* \file ispell.C
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author unknown
* \author Angus Leeming
* \author John Levon
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "ispell.h"
#include "bufferparams.h"
#include "debug.h"
#include "encoding.h"
#include "gettext.h"
#include "language.h"
#include "lyxrc.h"
#include "WordLangTuple.h"
#include "support/forkedcall.h"
// HP-UX 11.x doesn't have this header
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <sys/time.h>
#ifndef CXX_GLOBAL_CSTD
using std::strcpy;
using std::strlen;
using std::strpbrk;
#endif
using std::auto_ptr;
using std::endl;
using std::max;
using std::string;
namespace {
class LaunchIspell : public lyx::support::ForkedProcess {
public:
///
LaunchIspell(BufferParams const & p, string const & l,
int * in, int * out, int * err)
: params(p), lang(l), pipein(in), pipeout(out), pipeerr(err) {}
///
virtual auto_ptr<lyx::support::ForkedProcess> clone() const {
return auto_ptr<lyx::support::ForkedProcess>(new LaunchIspell(*this));
}
///
int start();
private:
///
virtual int generateChild();
///
BufferParams const & params;
string const & lang;
int * const pipein;
int * const pipeout;
int * const pipeerr;
};
int LaunchIspell::start()
{
command_ = lyxrc.isp_command;
return runNonBlocking();
}
int LaunchIspell::generateChild()
{
pid_t isp_pid = fork();
if (isp_pid != 0) {
// failed (-1) or parent process (>0)
return isp_pid;
}
// child process
dup2(pipein[0], STDIN_FILENO);
dup2(pipeout[1], STDOUT_FILENO);
dup2(pipeerr[1], STDERR_FILENO);
close(pipein[0]);
close(pipein[1]);
close(pipeout[0]);
close(pipeout[1]);
close(pipeerr[0]);
close(pipeerr[1]);
char * argv[14];
int argc = 0;
char * tmp = new char[lyxrc.isp_command.length() + 1];
lyxrc.isp_command.copy(tmp, lyxrc.isp_command.length());
tmp[lyxrc.isp_command.length()] = '\0';
argv[argc++] = tmp;
tmp = new char[3];
string("-a").copy(tmp, 2); tmp[2] = '\0'; // pipe mode
argv[argc++] = tmp;
if (lang != "default") {
tmp = new char[3];
string("-d").copy(tmp, 2); tmp[2] = '\0'; // Dictionary file
argv[argc++] = tmp;
tmp = new char[lang.length() + 1];
lang.copy(tmp, lang.length()); tmp[lang.length()] = '\0';
argv[argc++] = tmp;
}
if (lyxrc.isp_accept_compound) {
// Consider run-together words as legal compounds
tmp = new char[3];
string("-C").copy(tmp, 2); tmp[2] = '\0';
argv[argc++] = tmp;
} else {
// Report run-together words with
// missing blanks as errors
tmp = new char[3];
string("-B").copy(tmp, 2); tmp[2] = '\0';
argv[argc++] = tmp;
}
if (lyxrc.isp_use_esc_chars) {
// Specify additional characters that
// can be part of a word
tmp = new char[3];
string("-w").copy(tmp, 2); tmp[2] = '\0';
argv[argc++] = tmp;
// Put the escape chars in ""s
string tms = '"' + lyxrc.isp_esc_chars + '"';
tmp = new char[tms.length() + 1];
tms.copy(tmp, tms.length()); tmp[tms.length()] = '\0';
argv[argc++] = tmp;
}
if (lyxrc.isp_use_pers_dict) {
// Specify an alternate personal dictionary
tmp = new char[3];
string("-p").copy(tmp, 2);
tmp[2]= '\0';
argv[argc++] = tmp;
tmp = new char[lyxrc.isp_pers_dict.length() + 1];
lyxrc.isp_pers_dict.copy(tmp, lyxrc.isp_pers_dict.length());
tmp[lyxrc.isp_pers_dict.length()] = '\0';
argv[argc++] = tmp;
}
if (lyxrc.isp_use_input_encoding &&
params.inputenc != "default") {
string enc = (params.inputenc == "auto")
? params.language->encoding()->LatexName()
: params.inputenc;
string::size_type n = enc.length();
tmp = new char[3];
string("-T").copy(tmp, 2);
tmp[2] = '\0';
argv[argc++] = tmp; // Input encoding
tmp = new char[n + 1];
enc.copy(tmp, n);
tmp[n] = '\0';
argv[argc++] = tmp;
}
argv[argc++] = 0;
execvp(argv[0], const_cast<char * const *>(argv));
// free the memory used by string::copy in the
// setup of argv
for (int i = 0; i < argc - 1; ++i)
delete[] argv[i];
lyxerr << "LyX: Failed to start ispell!" << endl;
_exit(0);
}
} // namespace anon
ISpell::ISpell(BufferParams const & params, string const & lang)
: in(0), out(0), inerr(0), str(0)
{
lyxerr[Debug::GUI] << "Created ispell" << endl;
// static due to the setvbuf. Ugly.
static char o_buf[BUFSIZ];
// We need to throw an exception not do this
pipein[0] = pipein[1] = pipeout[0] = pipeout[1]
= pipeerr[0] = pipeerr[1] = -1;
// This is what happens when goto gets banned.
if (pipe(pipein) == -1) {
error_ = _("Can't create pipe for spellchecker.");
return;
}
if (pipe(pipeout) == -1) {
close(pipein[0]);
close(pipein[1]);
error_ = _("Can't create pipe for spellchecker.");
return;
}
if (pipe(pipeerr) == -1) {
close(pipein[0]);
close(pipein[1]);
close(pipeout[0]);
close(pipeout[1]);
error_ = _("Can't create pipe for spellchecker.");
return;
}
if ((out = fdopen(pipein[1], "w")) == 0) {
error_ = _("Can't open pipe for spellchecker.");
return;
}
if ((in = fdopen(pipeout[0], "r")) == 0) {
error_ = _("Can't open pipe for spellchecker.");
return;
}
if ((inerr = fdopen(pipeerr[0], "r")) == 0) {
error_ = _("Can't open pipe for spellchecker.");
return;
}
setvbuf(out, o_buf, _IOLBF, BUFSIZ);
LaunchIspell * li = new LaunchIspell(params, lang, pipein, pipeout, pipeerr);
child_.reset(li);
if (li->start() == -1) {
error_ = _("Could not create an ispell process.\nYou may not have "
"the right languages installed.");
child_.reset(0);
return;
}
/* Parent process: Read ispells identification message */
bool err_read;
bool error = select(err_read);
if (!error) {
if (!err_read) {
// Set terse mode (silently accept correct words)
fputs("!\n", out);
return;
}
/* must have read something from stderr */
error_ = buf;
} else {
// select returned error
error_ = _("The spell process returned an error.\nPerhaps "
"it has been configured wrongly ?");
}
close(pipein[0]);
close(pipein[1]);
close(pipeout[0]);
close(pipeout[1]);
close(pipeerr[0]);
close(pipeerr[1]);
child_->kill();
child_.reset(0);
}
ISpell::~ISpell()
{
lyxerr[Debug::GUI] << "Killing ispell" << endl;
if (in)
fclose(in);
if (inerr)
fclose(inerr);
if (out) {
fputs("#\n", out); // Save personal dictionary
fflush(out);
fclose(out);
}
close(pipein[0]);
close(pipein[1]);
close(pipeout[0]);
close(pipeout[1]);
close(pipeerr[0]);
close(pipeerr[1]);
delete [] str;
}
bool ISpell::select(bool & err_read)
{
fd_set infds;
struct timeval tv;
int retval = 0;
FD_ZERO(&infds);
FD_SET(pipeout[0], &infds);
FD_SET(pipeerr[0], &infds);
tv.tv_sec = 2;
tv.tv_usec = 0;
retval = ::select(SELECT_TYPE_ARG1 (max(pipeout[0], pipeerr[0]) + 1),
SELECT_TYPE_ARG234 (&infds),
0,
0,
SELECT_TYPE_ARG5 (&tv));
// error
if (retval <= 0)
return true;
if (FD_ISSET(pipeerr[0], &infds)) {
fgets(buf, BUFSIZ, inerr);
err_read = true;
return false;
}
fgets(buf, BUFSIZ, in);
err_read = false;
return false;
}
string const ISpell::nextMiss()
{
// Well, somebody is a sick fuck.
if (str == 0 || *(e+1) == '\0')
return "";
char * b = e + 2;
e = strpbrk(b, ",\n");
*e = '\0';
if (b)
return b;
return "";
}
bool ISpell::alive()
{
return child_.get() && child_->running();
}
enum ISpell::Result ISpell::check(WordLangTuple const & word)
{
// FIXME Please rewrite to use string.
Result res;
::fputs(word.word().c_str(), out);
::fputc('\n', out);
bool err_read;
bool error = select(err_read);
if (error) {
error_ = _("Could not communicate with the spell-checker program.");
return UNKNOWN;
}
if (err_read) {
error_ = buf;
return UNKNOWN;
}
// I think we have to check if ispell is still alive here because
// the signal-handler could have disabled blocking on the fd
if (!alive())
return UNKNOWN;
switch (*buf) {
case '*':
res = OK;
break;
case '+':
res = ROOT;
break;
case '-':
res = COMPOUNDWORD;
break;
case '\n':
res = IGNORE;
break;
case '#': // Not found, no near misses and guesses
res = UNKNOWN;
break;
case '?': // Not found, and no near misses, but guesses (guesses are ignored)
case '&': // Not found, but we have near misses
{
res = MISSED;
char * p = strpbrk(buf, ":");
str = new char[strlen(p) + 1];
e = str;
strcpy(str, p);
break;
}
default: // This shouldn't happen, but you know Murphy
res = UNKNOWN;
}
*buf = 0;
if (res != IGNORE) {
/* wait for ispell to finish */
while (*buf!= '\n')
fgets(buf, 255, in);
}
return res;
}
void ISpell::insert(WordLangTuple const & word)
{
::fputc('*', out); // Insert word in personal dictionary
::fputs(word.word().c_str(), out);
::fputc('\n', out);
}
void ISpell::accept(WordLangTuple const & word)
{
::fputc('@', out); // Accept in this session
::fputs(word.word().c_str(), out);
::fputc('\n', out);
}
string const ISpell::error()
{
return error_;
}