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Extract calc++ from the documentation.

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* doc/bison.texinfo (Calc++): Add the extraction marks.
* examples/extexi: New, from the aborted GNU Programming 2E.
Separate the different paragraph of a file with empty lines.
* examples/Makefile: Use it to extract the whole calc++ example.
This commit is contained in:
Akim Demaille
2005-07-05 07:21:30 +00:00
parent 8a0adb0183
commit 1c59e0a121
9 changed files with 235 additions and 66 deletions
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20
examples/calc++/Makefile
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@@ -13,3 +13,23 @@ clean:
calc++-parser.cc calc++-parser.hh \
calc++-scanner.cc \
calc++
## ------------ ##
## Extracting. ##
## ------------ ##
EXTRACTED = \
calc++-driver.hh calc++-driver.cc \
calc++-parser.yy \
calc++-scanner.ll \
calc++.cc
doc = ../../doc/bison.texinfo
extexi = gawk -f ../extexi
RECURSIVE_TARGETS += extract
$(EXTRACTED): $(doc) ../extexi
$(extexi) $(doc) -- $(EXTRACTED)
extract extract-am: $(EXTRACTED)

4
examples/calc++/calc++-driver.cc
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@@ -1,9 +1,9 @@
#line 7140 "../../doc/bison.texinfo"
#include "calc++-driver.hh"
#include "calc++-parser.hh"
calcxx_driver::calcxx_driver ()
: trace_scanning (false),
trace_parsing (false)
: trace_scanning (false), trace_parsing (false)
{
variables["one"] = 1;
variables["two"] = 2;

59
examples/calc++/calc++-driver.hh
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@@ -1,64 +1,47 @@
#line 7036 "../../doc/bison.texinfo"
#ifndef CALCXX_DRIVER_HH
# define CALCXX_DRIVER_HH
# include <string>
# include <map>
/// Forward declarations.
#line 7051 "../../doc/bison.texinfo"
// Forward declarations.
union YYSTYPE;
namespace yy
{
class calcxx_parser;
class location;
class calcxx_parser;
}
class calcxx_driver;
#line 7069 "../../doc/bison.texinfo"
// Announce to Flex the prototype we want for lexing function, ...
# define YY_DECL \
# define YY_DECL \
int yylex (YYSTYPE* yylval, yy::location* yylloc, calcxx_driver& driver)
// ... and declare it for the parser's sake.
YY_DECL;
/// Conducting the whole scanning and parsing of Calc++.
#line 7082 "../../doc/bison.texinfo"
// Conducting the whole scanning and parsing of Calc++.
class calcxx_driver
{
public:
calcxx_driver ();
virtual ~calcxx_driver ();
/// The variables.
std::map<std::string, int> variables;
/// \name Handling the scanner.
/// \{
/// Open \a file for scanning.
void scan_begin ();
/// End scanning, clean up memory.
void scan_end ();
/// Whether to enable scanner traces.
bool trace_scanning;
/// \}
/// \name Handling the parser.
/// \{
/// Parse the file \a f.
void parse (const std::string& f);
/// The file being parsed.
std::string file;
/// Whether to enable parsing traces.
bool trace_parsing;
/// \}
/// The result.
int result;
/// \name Error handling.
/// \{
/// Register a located error.
#line 7101 "../../doc/bison.texinfo"
// Handling the scanner.
void scan_begin ();
void scan_end ();
bool trace_scanning;
#line 7112 "../../doc/bison.texinfo"
// Handling the parser.
void parse (const std::string& f);
std::string file;
bool trace_parsing;
#line 7126 "../../doc/bison.texinfo"
// Error handling.
void error (const yy::location& l, const std::string& m);
/// Register an error.
void error (const std::string& m);
/// \}
};
#endif
#endif // ! CALCXX_DRIVER_HH

28
examples/calc++/calc++-parser.yy
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@@ -1,48 +1,44 @@
%skeleton "lalr1.cc" /* -*- C++ -*- */
#line 7188 "../../doc/bison.texinfo"
%skeleton "lalr1.cc" /* -*- C++ -*- */
%define "parser_class_name" "calcxx_parser"
%defines
%{
# include <string>
# include "calc++-driver.hh"
%}
%error-verbose
#line 7204 "../../doc/bison.texinfo"
// The parsing context.
%parse-param { calcxx_driver& driver }
%lex-param { calcxx_driver& driver }
#line 7217 "../../doc/bison.texinfo"
%locations
%initial-action
{
// Initialize the initial location.
@$.begin.filename = @$.end.filename = &driver.file;
};
// Define yydebug.
#line 7231 "../../doc/bison.texinfo"
%debug
%error-verbose
#line 7241 "../../doc/bison.texinfo"
// Symbols.
%union
{
/// Value of a numeric literal.
int ival;
/// Name of a variable.
std::string *sval;
};
#line 7258 "../../doc/bison.texinfo"
%token YYEOF 0 "end of file"
%token TOKEN_ASSIGN ":="
%token <sval> TOKEN_IDENTIFIER "identifier"
%token <ival> TOKEN_NUMBER "number"
%type <ival> exp "expression"
#line 7271 "../../doc/bison.texinfo"
%printer { debug_stream () << *$$; } "identifier"
%destructor { delete $$; } "identifier"
%printer { debug_stream () << $$; } "number" "expression"
#line 7282 "../../doc/bison.texinfo"
%%
%start unit;
unit: assignments exp { driver.result = $2; };
@@ -61,8 +57,10 @@ exp: exp '+' exp { $$ = $1 + $3; }
| TOKEN_IDENTIFIER { $$ = driver.variables[*$1]; }
| TOKEN_NUMBER { $$ = $1; };
%%
#line 7308 "../../doc/bison.texinfo"
void
yy::calcxx_parser::error (const location& l, const std::string& m)
yy::calcxx_parser::error (const yy::calcxx_parser::location_type& l,
const std::string& m)
{
driver.error (l, m);
}

11
examples/calc++/calc++-scanner.ll
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@@ -1,33 +1,28 @@
%{ /* -*- C++ -*- */
%{ /* -*- C++ -*- */
# include <string>
# include <cerrno>
# include "calc++-driver.hh"
# include "calc++-parser.hh"
%}
%option noyywrap nounput debug batch
%option noyywrap nounput batch debug
id [a-zA-Z][a-zA-Z_0-9]*
int [0-9]+
blank [ \t]
%%
%{
# define YY_USER_ACTION yylloc->columns (yyleng);
yylloc->step ();
# define YY_USER_ACTION yylloc->columns (yyleng);
%}
{blank}+ yylloc->step ();
[\n]+ yylloc->lines (yyleng); yylloc->step ();
[-+*/] return yytext[0];
":=" return TOKEN_ASSIGN;
{int} yylval->ival = atoi (yytext); return TOKEN_NUMBER;
{id} yylval->sval = new std::string (yytext); return TOKEN_IDENTIFIER;
. driver.error (*yylloc, "invalid character");
%%
void

1
examples/calc++/calc++.cc
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@@ -1,3 +1,4 @@
#line 7414 "../../doc/bison.texinfo"
#include <iostream>
#include "calc++-driver.hh"