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examples: simplify/improve

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* examples/variant.yy: Put yylex in yy::, and simplify accordingly.
Minor formatting changes.
This commit is contained in:
Akim Demaille
2012-11-01 17:52:41 +01:00
parent 62cb570a8d
commit 0b3287025d
1 changed files with 38 additions and 32 deletions
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70
examples/variant.yy
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@@ -38,7 +38,10 @@ typedef std::list<std::string> strings_type;
#include <sstream>
// Prototype of the yylex function providing subsequent tokens.
static yy::parser::symbol_type yylex ();
namespace yy
{
static parser::symbol_type yylex ();
}
// Printing a list of strings.
// Koening look up will look into std, since that's an std::list.
@@ -91,41 +94,44 @@ item:
;
%%
// The yylex function providing subsequent tokens:
// TEXT "I have three numbers for you:"
// NUMBER 1
// NUMBER 2
// NUMBER 3
// TEXT " and that's all!"
// END_OF_FILE
static
yy::parser::symbol_type
yylex ()
namespace yy
{
static int stage = -1;
++stage;
yy::parser::location_type loc(0, stage + 1, stage + 1);
switch (stage)
// The yylex function providing subsequent tokens:
// TEXT "I have three numbers for you."
// NUMBER 1
// NUMBER 2
// NUMBER 3
// TEXT "And that's all!"
// END_OF_FILE
static
parser::symbol_type
yylex ()
{
case 0:
return yy::parser::make_TEXT ("I have three numbers for you.", loc);
case 1:
case 2:
case 3:
return yy::parser::make_NUMBER (stage, loc);
case 4:
return yy::parser::make_TEXT ("And that's all!", loc);
default:
return yy::parser::make_END_OF_FILE (loc);
static int stage = -1;
++stage;
parser::location_type loc(0, stage + 1, stage + 1);
switch (stage)
{
case 0:
return parser::make_TEXT ("I have three numbers for you.", loc);
case 1:
case 2:
case 3:
return parser::make_NUMBER (stage, loc);
case 4:
return parser::make_TEXT ("And that's all!", loc);
default:
return parser::make_END_OF_FILE (loc);
}
}
}
// Mandatory error function
void
yy::parser::error (const yy::parser::location_type& loc, const std::string& msg)
{
std::cerr << loc << ": " << msg << std::endl;
// Mandatory error function
void
parser::error (const parser::location_type& loc, const std::string& msg)
{
std::cerr << loc << ": " << msg << std::endl;
}
}
int