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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/parser_driver.h"
#include <antlr4-runtime.h>
#include <memory>
#include <vector>
#include "src/CalculatorBaseVisitor.h"
#include "src/CalculatorLexer.h"
#include "src/CalculatorParser.h"
#include "src/language.h"
#include "third_party/abseil/absl/strings/string_view.h"
namespace ec {
namespace {
template <typename T, typename... Args>
std::shared_ptr<const Term> MakeTerm(Args... args) {
return std::static_pointer_cast<const Term>(std::make_shared<T>(args...));
}
class Visitor : public CalculatorBaseVisitor {
public:
antlrcpp::Any visitProgram(CalculatorParser::ProgramContext* ctx) override {
Program p;
for (CalculatorParser::TermContext* term : ctx->term()) {
p.push_back(visit(term));
}
return p;
}
antlrcpp::Any visitNumber(CalculatorParser::NumberContext* ctx) override {
return MakeTerm<GroundTerm>(ctx->value);
}
antlrcpp::Any visitIdentifier(
CalculatorParser::IdentifierContext* ctx) override {
return MakeTerm<SymbolTerm>(ctx->value);
}
antlrcpp::Any visitError(CalculatorParser::ErrorContext*) override {
throw ParseError();
}
};
} // namespace
Program ParseFromString(absl::string_view text) {
antlr4::ANTLRInputStream input(text.data(), text.size());
CalculatorLexer lexer(&input);
antlr4::CommonTokenStream tokens(&lexer);
CalculatorParser parser(&tokens);
return Visitor().visit(parser.program());
}
} // namespace ec
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