serene/include/serene/exprs/expression.h

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/* -*- C++ -*-
* Serene programming language.
*
* Copyright (c) 2019-2021 Sameer Rahmani <lxsameer@gnu.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef EXPRS_EXPRESSION_H
#define EXPRS_EXPRESSION_H
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#include "serene/reader/location.h"
#include "serene/utils.h"
#include <memory>
namespace serene {
namespace reader {
class SemanticContext;
}
/// Contains all the builtin AST expressions including those which do not appear
/// in the syntax directly. Like function definitions.
namespace exprs {
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/// This enum represent the expression type and **not** the value type.
enum class ExprType {
Symbol,
List,
Number,
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};
class Expression;
using node = std::shared_ptr<Expression>;
using maybe_node = Result<node>;
using ast = llvm::SmallVector<node, 0>;
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/// The base class of the expressions which provides the common interface for
/// the expressions to implement.
class Expression {
public:
/// The location range provide information regarding to where in the input
/// string the current expression is used.
reader::LocationRange location;
Expression(const reader::LocationRange &loc) : location(loc){};
virtual ~Expression() = default;
/// Returns the type of the expression. We need this funciton to perform
/// dynamic casting of expression object to implementations such as lisp or
/// symbol.
virtual ExprType getType() const = 0;
/// The AST representation of an expression
virtual std::string toString() const = 0;
virtual maybe_node analyze(reader::SemanticContext &) = 0;
};
/// Create a new `node` of type `T` and forwards any given parameter
/// to the constructor of type `T`. This is the **official way** to create
/// a new `Expression`. Here is an example:
/// \code
/// auto list = make<List>();
/// \endcode
///
/// \param[args] Any argument with any type passed to this function will be
/// passed to the constructor of type T.
/// \return A shared pointer to an Expression
template <typename T, typename... Args> node make(Args &&...args) {
return std::shared_ptr<T>(new T(std::forward<Args>(args)...));
};
/// Create a new `node` of type `T` and forwards any given parameter
/// to the constructor of type `T`. This is the **official way** to create
/// a new `Expression`. Here is an example:
/// \code
/// auto list = make<List>();
/// \endcode
///
/// \param[args] Any argument with any type passed to this function will be
/// passed to the constructor of type T.
/// \return A shared pointer to a value of type T.
template <typename T, typename... Args>
std::shared_ptr<T> makeAndCast(Args &&...args) {
return std::shared_ptr<T>(new T(std::forward<Args>(args)...));
};
} // namespace exprs
} // namespace serene
#endif