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// Copyright 2021 Benjamin Barenblat
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// An extremely simple EDSL for describing output to the terminal. It supports
// exactly two instructions: "send some bytes to the terminal" and "sleep". The
// string capability interpreter produces terms in this EDSL, which makes it
// easier to test.
#ifndef EC_GOLDFISHTERM_INTERNAL_EMIT_H_
#define EC_GOLDFISHTERM_INTERNAL_EMIT_H_
#include <stdint.h>
#include <memory>
#include <ostream>
#include <string>
#include <utility>
#include "third_party/abseil/absl/strings/str_cat.h"
#include "third_party/abseil/absl/strings/string_view.h"
#include "third_party/abseil/absl/time/time.h"
#include "third_party/abseil/absl/types/span.h"
namespace goldfishterm_internal {
class EmitTerm {
public:
virtual void Emit(std::ostream&) const = 0;
virtual ~EmitTerm() noexcept = default;
};
class EmitBytes final : public EmitTerm {
public:
explicit EmitBytes() noexcept = default;
explicit EmitBytes(absl::string_view bytes) noexcept : bytes_(bytes) {}
EmitBytes(const EmitBytes&) = default;
EmitBytes& operator=(const EmitBytes&) = default;
EmitBytes(EmitBytes&&) noexcept = default;
EmitBytes& operator=(EmitBytes&&) noexcept = default;
bool empty() const noexcept { return bytes_.empty(); }
void Append(absl::string_view more) noexcept {
absl::StrAppend(&bytes_, more);
}
void Emit(std::ostream&) const override;
bool operator==(const EmitBytes& other) const noexcept {
return bytes_ == other.bytes_;
}
friend std::ostream& operator<<(std::ostream& out,
const EmitBytes& emit) noexcept {
return out << "EmitBytes(" << emit.bytes_ << ')';
}
private:
std::string bytes_;
};
class EmitDelay final : public EmitTerm {
public:
explicit EmitDelay() noexcept = default;
explicit EmitDelay(absl::Duration delay) : delay_(std::move(delay)) {}
EmitDelay(const EmitDelay&) = default;
EmitDelay& operator=(const EmitDelay&) = default;
EmitDelay(EmitDelay&&) noexcept = default;
EmitDelay& operator=(EmitDelay&&) noexcept = default;
bool zero() const noexcept { return delay_ == absl::ZeroDuration(); }
void Increase(absl::Duration more) noexcept { delay_ += more; }
void Emit(std::ostream&) const noexcept override;
bool operator==(const EmitDelay& other) const noexcept {
return delay_ == other.delay_;
}
private:
absl::Duration delay_;
};
// Runs an entire program in the emitter EDSL.
void Emit(absl::Span<const std::shared_ptr<const EmitTerm>>, std::ostream&);
} // namespace goldfishterm_internal
#endif // EC_GOLDFISHTERM_INTERNAL_EMIT_H_
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