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Boost-Commit : |
Subject: [Boost-commit] svn:boost r69204 - trunk/libs/spirit/example/qi/compiler_tutorial
From: joel_at_[hidden]
Date: 2011-02-23 05:54:06
Author: djowel
Date: 2011-02-23 05:54:02 EST (Wed, 23 Feb 2011)
New Revision: 69204
URL: http://svn.boost.org/trac/boost/changeset/69204
Log:
More updates
Added:
trunk/libs/spirit/example/qi/compiler_tutorial/calc6.cpp (contents, props changed)
Text files modified:
trunk/libs/spirit/example/qi/compiler_tutorial/calc4.cpp | 15 ++++++++++++---
trunk/libs/spirit/example/qi/compiler_tutorial/calc5.cpp | 15 ++++++++++++---
2 files changed, 24 insertions(+), 6 deletions(-)
Modified: trunk/libs/spirit/example/qi/compiler_tutorial/calc4.cpp
==============================================================================
--- trunk/libs/spirit/example/qi/compiler_tutorial/calc4.cpp (original)
+++ trunk/libs/spirit/example/qi/compiler_tutorial/calc4.cpp 2011-02-23 05:54:02 EST (Wed, 23 Feb 2011)
@@ -34,6 +34,9 @@
namespace client { namespace ast
{
+ ///////////////////////////////////////////////////////////////////////////
+ // The AST
+ ///////////////////////////////////////////////////////////////////////////
struct nil {};
struct signed_;
struct program;
@@ -85,6 +88,9 @@
namespace client { namespace ast
{
+ ///////////////////////////////////////////////////////////////////////////
+ // The AST Printer
+ ///////////////////////////////////////////////////////////////////////////
struct printer
{
typedef void result_type;
@@ -125,6 +131,9 @@
}
};
+ ///////////////////////////////////////////////////////////////////////////
+ // The AST evaluator
+ ///////////////////////////////////////////////////////////////////////////
struct eval
{
typedef int result_type;
@@ -176,7 +185,7 @@
namespace ascii = boost::spirit::ascii;
///////////////////////////////////////////////////////////////////////////////
- // Our calculator grammar
+ // The calculator grammar
///////////////////////////////////////////////////////////////////////////////
template <typename Iterator>
struct calculator : qi::grammar<Iterator, ast::program(), ascii::space_type>
@@ -239,7 +248,7 @@
calculator calc; // Our grammar
ast_program program; // Our program (AST)
- ast_print printer; // Prints the program
+ ast_print print; // Prints the program
ast_eval eval; // Evaluates the program
std::string::const_iterator iter = str.begin();
@@ -251,7 +260,7 @@
{
std::cout << "-------------------------\n";
std::cout << "Parsing succeeded\n";
- printer(program);
+ print(program);
std::cout << "\nResult: " << eval(program) << std::endl;
std::cout << "-------------------------\n";
}
Modified: trunk/libs/spirit/example/qi/compiler_tutorial/calc5.cpp
==============================================================================
--- trunk/libs/spirit/example/qi/compiler_tutorial/calc5.cpp (original)
+++ trunk/libs/spirit/example/qi/compiler_tutorial/calc5.cpp 2011-02-23 05:54:02 EST (Wed, 23 Feb 2011)
@@ -41,6 +41,9 @@
namespace client { namespace ast
{
+ ///////////////////////////////////////////////////////////////////////////
+ // The AST
+ ///////////////////////////////////////////////////////////////////////////
struct nil {};
struct signed_;
struct program;
@@ -92,6 +95,9 @@
namespace client { namespace ast
{
+ ///////////////////////////////////////////////////////////////////////////
+ // The AST Printer
+ ///////////////////////////////////////////////////////////////////////////
struct printer
{
typedef void result_type;
@@ -132,6 +138,9 @@
}
};
+ ///////////////////////////////////////////////////////////////////////////
+ // The AST evaluator
+ ///////////////////////////////////////////////////////////////////////////
struct eval
{
typedef int result_type;
@@ -276,7 +285,7 @@
typedef std::string::const_iterator iterator_type;
typedef client::calculator<iterator_type> calculator;
typedef client::ast::program ast_program;
- typedef client::ast::printer ast_print;
+ typedef client::ast::print ast_print;
typedef client::ast::eval ast_eval;
std::string str;
@@ -287,7 +296,7 @@
calculator calc; // Our grammar
ast_program program; // Our program (AST)
- ast_print printer; // Prints the program
+ ast_print print; // Prints the program
ast_eval eval; // Evaluates the program
std::string::const_iterator iter = str.begin();
@@ -299,7 +308,7 @@
{
std::cout << "-------------------------\n";
std::cout << "Parsing succeeded\n";
- printer(program);
+ print(program);
std::cout << "\nResult: " << eval(program) << std::endl;
std::cout << "-------------------------\n";
}
Added: trunk/libs/spirit/example/qi/compiler_tutorial/calc6.cpp
==============================================================================
--- (empty file)
+++ trunk/libs/spirit/example/qi/compiler_tutorial/calc6.cpp 2011-02-23 05:54:02 EST (Wed, 23 Feb 2011)
@@ -0,0 +1,361 @@
+/*=============================================================================
+ Copyright (c) 2001-2011 Joel de Guzman
+
+ Distributed under the Boost Software License, Version 1.0. (See accompanying
+ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+///////////////////////////////////////////////////////////////////////////////
+//
+// Yet another calculator example! This time, we will compile to a simple
+// virtual machine. This is actually one of the very first Spirit example
+// circa 2000. Now, it's ported to Spirit2.
+//
+// [ JDG April 28, 2008 : For BoostCon 2008 ]
+// [ JDG February 18, 2011 : Pure attributes. No semantic actions. ]
+//
+///////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////
+// Spirit v2.5 allows you to suppress automatic generation
+// of predefined terminals to speed up complation. With
+// BOOST_SPIRIT_NO_PREDEFINED_TERMINALS defined, you are
+// responsible in creating instances of the terminals that
+// you need (e.g. see qi::uint_type uint_ below).
+#define BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
+///////////////////////////////////////////////////////////////////////////////
+
+///////////////////////////////////////////////////////////////////////////////
+// Uncomment this if you want to enable debugging
+//#define BOOST_SPIRIT_QI_DEBUG
+///////////////////////////////////////////////////////////////////////////////
+
+#include <boost/config/warning_disable.hpp>
+#include <boost/spirit/include/qi.hpp>
+#include <boost/variant/recursive_variant.hpp>
+#include <boost/variant/apply_visitor.hpp>
+#include <boost/fusion/include/adapt_struct.hpp>
+#include <boost/spirit/include/phoenix_function.hpp>
+#include <boost/foreach.hpp>
+
+#include <iostream>
+#include <string>
+
+namespace client { namespace ast
+{
+ ///////////////////////////////////////////////////////////////////////////
+ // The AST
+ ///////////////////////////////////////////////////////////////////////////
+ struct nil {};
+ struct signed_;
+ struct program;
+
+ typedef boost::variant<
+ nil
+ , unsigned int
+ , boost::recursive_wrapper<signed_>
+ , boost::recursive_wrapper<program>
+ >
+ operand;
+
+ struct signed_
+ {
+ char sign;
+ operand operand_;
+ };
+
+ struct operation
+ {
+ char operator_;
+ operand operand_;
+ };
+
+ struct program
+ {
+ operand first;
+ std::list<operation> rest;
+ };
+}}
+
+BOOST_FUSION_ADAPT_STRUCT(
+ client::ast::signed_,
+ (char, sign)
+ (client::ast::operand, operand_)
+)
+
+BOOST_FUSION_ADAPT_STRUCT(
+ client::ast::operation,
+ (char, operator_)
+ (client::ast::operand, operand_)
+)
+
+BOOST_FUSION_ADAPT_STRUCT(
+ client::ast::program,
+ (client::ast::operand, first)
+ (std::list<client::ast::operation>, rest)
+)
+
+namespace client
+{
+ ///////////////////////////////////////////////////////////////////////////
+ // The Virtual Machine
+ ///////////////////////////////////////////////////////////////////////////
+ enum byte_code
+ {
+ op_neg, // negate the top stack entry
+ op_add, // add top two stack entries
+ op_sub, // subtract top two stack entries
+ op_mul, // multiply top two stack entries
+ op_div, // divide top two stack entries
+ op_int, // push constant integer into the stack
+ };
+
+ class vmachine
+ {
+ public:
+
+ vmachine(unsigned stackSize = 4096)
+ : stack(stackSize)
+ , stack_ptr(stack.begin())
+ {
+ }
+
+ int top() const { return stack_ptr[-1]; };
+ void execute(std::vector<int> const& code);
+
+ private:
+
+ std::vector<int> stack;
+ std::vector<int>::iterator stack_ptr;
+ };
+
+ void vmachine::execute(std::vector<int> const& code)
+ {
+ std::vector<int>::const_iterator pc = code.begin();
+ stack_ptr = stack.begin();
+
+ while (pc != code.end())
+ {
+ switch (*pc++)
+ {
+ case op_neg:
+ stack_ptr[-1] = -stack_ptr[-1];
+ break;
+
+ case op_add:
+ --stack_ptr;
+ stack_ptr[-1] += stack_ptr[0];
+ break;
+
+ case op_sub:
+ --stack_ptr;
+ stack_ptr[-1] -= stack_ptr[0];
+ break;
+
+ case op_mul:
+ --stack_ptr;
+ stack_ptr[-1] *= stack_ptr[0];
+ break;
+
+ case op_div:
+ --stack_ptr;
+ stack_ptr[-1] /= stack_ptr[0];
+ break;
+
+ case op_int:
+ *stack_ptr++ = *pc++;
+ break;
+ }
+ }
+ }
+
+ ///////////////////////////////////////////////////////////////////////////
+ // The Compiler
+ ///////////////////////////////////////////////////////////////////////////
+ struct compiler
+ {
+ typedef void result_type;
+
+ std::vector<int>& code;
+ compiler(std::vector<int>& code)
+ : code(code) {}
+
+ void operator()(ast::nil) const { BOOST_ASSERT(0); }
+ void operator()(unsigned int n) const
+ {
+ code.push_back(op_int);
+ code.push_back(n);
+ }
+
+ void operator()(ast::operation const& x) const
+ {
+ boost::apply_visitor(*this, x.operand_);
+ switch (x.operator_)
+ {
+ case '+': code.push_back(op_add); break;
+ case '-': code.push_back(op_sub); break;
+ case '*': code.push_back(op_mul); break;
+ case '/': code.push_back(op_div); break;
+ default: BOOST_ASSERT(0); break;
+ }
+ }
+
+ void operator()(ast::signed_ const& x) const
+ {
+ boost::apply_visitor(*this, x.operand_);
+ switch (x.sign)
+ {
+ case '-': code.push_back(op_neg); break;
+ case '+': break;
+ default: BOOST_ASSERT(0); break;
+ }
+ }
+
+ void operator()(ast::program const& x) const
+ {
+ boost::apply_visitor(*this, x.first);
+ BOOST_FOREACH(ast::operation const& oper, x.rest)
+ {
+ (*this)(oper);
+ }
+ }
+ };
+
+ namespace qi = boost::spirit::qi;
+ namespace ascii = boost::spirit::ascii;
+ using boost::phoenix::function;
+
+ ///////////////////////////////////////////////////////////////////////////////
+ // The error handler
+ ///////////////////////////////////////////////////////////////////////////////
+ struct error_handler_
+ {
+ template <typename, typename, typename>
+ struct result { typedef void type; };
+
+ template <typename Iterator>
+ void operator()(
+ qi::info const& what
+ , Iterator err_pos, Iterator last) const
+ {
+ std::cout
+ << "Error! Expecting "
+ << what // what failed?
+ << " here: \""
+ << std::string(err_pos, last) // iterators to error-pos, end
+ << "\""
+ << std::endl
+ ;
+ }
+ };
+
+ function<error_handler_> const error_handler = error_handler_();
+
+ ///////////////////////////////////////////////////////////////////////////////
+ // The calculator grammar
+ ///////////////////////////////////////////////////////////////////////////////
+ template <typename Iterator>
+ struct calculator : qi::grammar<Iterator, ast::program(), ascii::space_type>
+ {
+ calculator() : calculator::base_type(expression)
+ {
+ qi::char_type char_;
+ qi::uint_type uint_;
+ qi::_2_type _2;
+ qi::_3_type _3;
+ qi::_4_type _4;
+
+ using qi::on_error;
+ using qi::fail;
+
+ expression =
+ term
+ >> *( (char_('+') > term)
+ | (char_('-') > term)
+ )
+ ;
+
+ term =
+ factor
+ >> *( (char_('*') > factor)
+ | (char_('/') > factor)
+ )
+ ;
+
+ factor =
+ uint_
+ | '(' > expression > ')'
+ | (char_('-') > factor)
+ | (char_('+') > factor)
+ ;
+
+ // Debugging and error handling and reporting support.
+ BOOST_SPIRIT_DEBUG_NODE(expression);
+ BOOST_SPIRIT_DEBUG_NODE(term);
+ BOOST_SPIRIT_DEBUG_NODE(factor);
+
+ // Error handling
+ on_error<fail>(expression, error_handler(_4, _3, _2));
+ }
+
+ qi::rule<Iterator, ast::program(), ascii::space_type> expression;
+ qi::rule<Iterator, ast::program(), ascii::space_type> term;
+ qi::rule<Iterator, ast::operand(), ascii::space_type> factor;
+ };
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Main program
+///////////////////////////////////////////////////////////////////////////////
+int
+main()
+{
+ std::cout << "/////////////////////////////////////////////////////////\n\n";
+ std::cout << "Expression parser...\n\n";
+ std::cout << "/////////////////////////////////////////////////////////\n\n";
+ std::cout << "Type an expression...or [q or Q] to quit\n\n";
+
+ typedef std::string::const_iterator iterator_type;
+ typedef client::calculator<iterator_type> calculator;
+ typedef client::ast::program ast_program;
+ typedef client::compiler compiler;
+
+ std::string str;
+ while (std::getline(std::cin, str))
+ {
+ if (str.empty() || str[0] == 'q' || str[0] == 'Q')
+ break;
+
+ client::vmachine mach; // Our virtual machine
+ std::vector<int> code; // Our VM code
+ calculator calc; // Our grammar
+ ast_program program; // Our program (AST)
+ compiler compile(code); // Compiles the program
+
+ std::string::const_iterator iter = str.begin();
+ std::string::const_iterator end = str.end();
+ boost::spirit::ascii::space_type space;
+ bool r = phrase_parse(iter, end, calc, space, program);
+
+ if (r && iter == end)
+ {
+ std::cout << "-------------------------\n";
+ std::cout << "Parsing succeeded\n";
+ compile(program);
+ mach.execute(code);
+ std::cout << "\nResult: " << mach.top() << std::endl;
+ std::cout << "-------------------------\n";
+ }
+ else
+ {
+ std::string rest(iter, end);
+ std::cout << "-------------------------\n";
+ std::cout << "Parsing failed\n";
+ std::cout << "-------------------------\n";
+ }
+ }
+
+ std::cout << "Bye... :-) \n\n";
+ return 0;
+}
+
+
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