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/*
* Copyright 2023 WebAssembly Community Group participants
*
* 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
*
* http://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.
*/
#ifndef parser_input_h
#define parser_input_h
#include "lexer.h"
#include "support/result.h"
#include "wasm.h"
namespace wasm::WATParser {
using namespace std::string_view_literals;
// Wraps a lexer and provides utilities for consuming tokens.
struct ParseInput {
Lexer lexer;
explicit ParseInput(std::string_view in) : lexer(in) {}
ParseInput(std::string_view in, size_t index) : lexer(in) {
lexer.setIndex(index);
}
ParseInput(const ParseInput& other, size_t index) : lexer(other.lexer) {
lexer.setIndex(index);
}
bool empty() { return lexer.empty(); }
std::optional<Token> peek();
bool takeLParen();
bool takeRParen();
bool takeUntilParen();
std::optional<Name> takeID();
std::optional<std::string_view> takeKeyword();
bool takeKeyword(std::string_view expected);
std::optional<uint64_t> takeOffset();
std::optional<uint32_t> takeAlign();
std::optional<uint64_t> takeU64();
std::optional<int64_t> takeS64();
std::optional<int64_t> takeI64();
std::optional<uint32_t> takeU32();
std::optional<int32_t> takeS32();
std::optional<int32_t> takeI32();
std::optional<uint8_t> takeU8();
std::optional<double> takeF64();
std::optional<float> takeF32();
std::optional<std::string> takeString();
std::optional<Name> takeName();
bool takeSExprStart(std::string_view expected);
bool peekSExprStart(std::string_view expected);
Index getPos();
[[nodiscard]] Err err(Index pos, std::string reason);
[[nodiscard]] Err err(std::string reason) { return err(getPos(), reason); }
};
#include "input-impl.h"
} // namespace wasm::WATParser
#endif // parser_input_h
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