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/*****
* parser.cc
* Tom Prince 2004/01/10
*
*****/
#include <fstream>
#include <sstream>
#include <cstring>
#include <fcntl.h>
#include "common.h"
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include "interact.h"
#include "locate.h"
#include "errormsg.h"
#include "parser.h"
#include "util.h"
// The lexical analysis and parsing functions used by parseFile.
void setlexer(size_t (*input) (char* bif, size_t max_size), string filename);
extern bool yyparse(void);
extern int yydebug;
extern int yy_flex_debug;
extern bool lexerEOF();
extern void reportEOF();
extern bool hangup;
static int fd;
namespace parser {
static FILE *fin=NULL;
namespace yy { // Lexers
std::streambuf *sbuf = NULL;
size_t stream_input(char *buf, size_t max_size)
{
return sbuf ? sbuf->sgetn(buf,max_size) : 0;
}
int fpeek(int fd)
{
int flags=fcntl(fd,F_GETFL,0);
fcntl(fd,F_SETFL,flags | O_NONBLOCK);
char c=fgetc(fin);
ungetc(c,fin);
fcntl(fd,F_SETFL,flags & ~O_NONBLOCK);
return c;
}
size_t pipe_input(char *buf, size_t max_size)
{
if(hangup && fpeek(fd) == EOF) {hangup=false; return 0;}
fgets(buf,max_size-1,fin);
return strlen(buf);
}
} // namespace yy
void debug(bool state)
{
// For debugging the machine-generated lexer and parser.
yy_flex_debug = yydebug = state;
}
namespace {
void error(const string& filename)
{
em.sync();
em << "error: could not load module '" << filename << "'\n";
em.sync();
throw handled_error();
}
}
absyntax::file *doParse(size_t (*input) (char* bif, size_t max_size),
const string& filename, bool extendable=false)
{
setlexer(input,filename);
absyntax::file *root = yyparse() == 0 ? absyntax::root : 0;
absyntax::root = 0;
yy::sbuf = 0;
if (!root) {
if (lexerEOF()) {
if (extendable) {
return 0;
} else {
// Have the lexer report the error.
reportEOF();
}
}
em.error(nullPos);
if(!interact::interactive)
error(filename);
else
throw handled_error();
}
return root;
}
absyntax::file *parseStdin()
{
debug(false);
if(!fin) {
fd=intcast(settings::getSetting<Int>("inpipe"));
if(fd >= 0)
fin=fdopen(fd,"r");
}
if(fin)
return doParse(yy::pipe_input,"-");
else {
yy::sbuf = cin.rdbuf();
return doParse(yy::stream_input,"-");
}
}
absyntax::file *parseFile(const string& filename,
const char *nameOfAction)
{
if(filename == "-")
return parseStdin();
string file = settings::locateFile(filename);
if(file.empty())
error(filename);
if(nameOfAction && settings::verbose > 1)
cerr << nameOfAction << " " << filename << " from " << file << endl;
debug(false);
std::filebuf filebuf;
if(!filebuf.open(file.c_str(),std::ios::in))
error(filename);
#ifdef HAVE_SYS_STAT_H
// Check that the file is not a directory.
static struct stat buf;
if(stat(file.c_str(),&buf) == 0) {
if(S_ISDIR(buf.st_mode))
error(filename);
}
#endif
// Check that the file can actually be read.
try {
filebuf.sgetc();
} catch (...) {
error(filename);
}
yy::sbuf = &filebuf;
return doParse(yy::stream_input,file);
}
absyntax::file *parseString(const string& code,
const string& filename,
bool extendable)
{
debug(false);
stringbuf buf(code);
yy::sbuf = &buf;
return doParse(yy::stream_input,filename,extendable);
}
} // namespace parser
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