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// Copyright (C) 2013, Gabriel Dos Reis.
// All rights reserved.
// Written by Gabriel Dos Reis.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// - Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// - Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// - Neither the name of OpenAxiom nor the names of its contributors
// may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// --% Author: Gabriel Dos Reis
// --% Abstract:
// --% Very simple support for some core Lisp-like operations.
#ifndef OPENAXIOM_LISP_included
#define OPENAXIOM_LISP_included
#include <list>
#include <open-axiom/sexpr>
#include <open-axiom/vm>
#include <map>
#include <open-axiom/diagnostics>
#include <iosfwd>
#include <unordered_set>
namespace std {
template<>
struct hash<OpenAxiom::VM::Scope> {
hash<OpenAxiom::VM::String>::result_type
operator()(const OpenAxiom::VM::Scope& s) const {
return h(s.name());
}
hash<OpenAxiom::VM::String> h;
};
template<>
struct equal_to<OpenAxiom::VM::Scope> {
using arg_type = OpenAxiom::VM::Scope;
bool operator()(const arg_type& x, const arg_type& y) const {
return p(x.name(), y.name());
}
equal_to<OpenAxiom::VM::String> p;
};
}
namespace OpenAxiom {
namespace Lisp {
using namespace VM;
// -- Unimplemented features
struct Unimplemented : Diagnostics::BasicError {
explicit Unimplemented(const std::string&);
};
// -- Integer overflow
struct IntegerOverflow : Diagnostics::BasicError {
explicit IntegerOverflow(const std::string&);
};
// -- Environments.
using Environment = std::map<Symbol*, Value>;
// -- Anchor maps
using AnchorTable = std::map<Ordinal, Value>;
// -- Evaluator --
struct Evaluator : VM::BasicContext {
Evaluator();
Scope* keyword_namespace() { return &keys; }
Scope* active_namespace() { return ns; }
Value toplevel_form(const Sexpr::Syntax*);
Value make_value(const Sexpr::Syntax*);
Environment* global_environment();
private:
Scope keys;
std::unordered_set<Scope> packages;
Scope* ns;
std::list<Environment> env_stack;
AnchorTable anchor_map;
};
// -- Format a value onto an output stream.
void format(Value, std::ostream&);
std::string show(Value);
// -- Retracts
Fixnum retract_to_fixnum(Value);
Pair retract_to_pair(Value);
Symbol* retract_to_symbol(Value);
// -- Alist functions
Value assoc(Value, Pair);
}
}
#endif // OPENAXIOM_LISP_included
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