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* doc/bison.texinfo (Calc++ Parsing Driver): Let "parse" return an

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error code.
(Calc++ Scanner): Exit with failure if we can't open the input
file.
Accept "-" standing for stdin.
(Calc++ Top Level): Print the result only if the parsing was
successful.
This commit is contained in:
Akim Demaille
2007-01-16 13:11:30 +00:00
parent 7cff04b572
commit bb32f4f284
2 changed files with 25 additions and 12 deletions
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27
doc/bison.texinfo
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@@ -34,7 +34,7 @@ This manual is for @acronym{GNU} Bison (version @value{VERSION},
@value{UPDATED}), the @acronym{GNU} parser generator.
Copyright @copyright{} 1988, 1989, 1990, 1991, 1992, 1993, 1995, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
@quotation
Permission is granted to copy, distribute and/or modify this document
@@ -7789,8 +7789,8 @@ Similarly for the parser itself.
@comment file: calc++-driver.hh
@example
// Handling the parser.
void parse (const std::string& f);
// Run the parser. Return 0 on success.
int parse (const std::string& f);
std::string file;
bool trace_parsing;
@end example
@@ -7831,15 +7831,16 @@ calcxx_driver::~calcxx_driver ()
@{
@}
void
int
calcxx_driver::parse (const std::string &f)
@{
file = f;
scan_begin ();
yy::calcxx_parser parser (*this);
parser.set_debug_level (trace_parsing);
parser.parse ();
int res = parser.parse ();
scan_end ();
return res;
@}
void
@@ -8135,8 +8136,13 @@ void
calcxx_driver::scan_begin ()
@{
yy_flex_debug = trace_scanning;
if (!(yyin = fopen (file.c_str (), "r")))
error (std::string ("cannot open ") + file);
if (file == "-")
yyin = stdin;
else if (!(yyin = fopen (file.c_str (), "r")))
@{
error (std::string ("cannot open ") + file);
exit (1);
@}
@}
void
@@ -8165,11 +8171,8 @@ main (int argc, char *argv[])
driver.trace_parsing = true;
else if (*argv == std::string ("-s"))
driver.trace_scanning = true;
else
@{
driver.parse (*argv);
std::cout << driver.result << std::endl;
@}
else if (!driver.parse (*argv))
std::cout << driver.result << std::endl;
@}
@end example