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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.
#include "src/ui/stream.h"
#include <assert.h>
#include <istream>
#include <memory>
#include <ostream>
#include <string>
#include "src/error.h"
#include "src/language.h"
#include "src/parser_driver.h"
#include "third_party/abseil/absl/strings/str_join.h"
namespace ec {
namespace {
std::string ReadAll(std::istream& in) noexcept {
std::string result;
int bytes_read = 0;
while (in.good()) {
result.append(4096, '\0');
in.read(result.data() + bytes_read, 4096);
bytes_read += in.gcount();
}
assert(bytes_read <= result.size());
result.resize(bytes_read);
return result;
}
void ShowState(const State& state, std::ostream& out) noexcept {
if (state.stack.empty()) {
return;
}
out << absl::StrJoin(state.stack, " ", FormatStackElement) << '\n';
}
} // namespace
int LineUi::Main() noexcept {
State state;
while (in_.good()) {
std::string line;
std::getline(in_, line);
try {
EvaluateAll(ParseFromString(line), state);
} catch (const Error& e) {
std::cerr << "ec: " << e.what() << '\n';
return 1;
}
}
ShowState(state, out_);
return 0;
}
int StreamUi::Main() noexcept {
State state;
std::string program = ReadAll(in_);
try {
EvaluateAll(ParseFromString(program), state);
} catch (const Error& e) {
std::cerr << "ec: " << e.what() << '\n';
return 1;
}
ShowState(state, out_);
return 0;
}
} // namespace ec
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