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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.
*/
#include <cstddef>
#include <cstdint>
#include <cstring>
#include <iterator>
#include <optional>
#include <ostream>
#include <string_view>
#include <variant>
#include "support/name.h"
#include "support/result.h"
#include "support/string.h"
#ifndef parser_lexer_h
#define parser_lexer_h
namespace wasm::WATParser {
struct TextPos {
size_t line;
size_t col;
bool operator==(const TextPos& other) const;
bool operator!=(const TextPos& other) const { return !(*this == other); }
friend std::ostream& operator<<(std::ostream& os, const TextPos& pos);
};
// ===========
// Annotations
// ===========
struct Annotation {
Name kind;
std::string_view contents;
};
extern Name srcAnnotationKind;
// =====
// Lexer
// =====
struct Lexer {
private:
size_t pos = 0;
std::vector<Annotation> annotations;
public:
std::string_view buffer;
Lexer(std::string_view buffer) : buffer(buffer) { setPos(0); }
size_t getPos() const { return pos; }
void setPos(size_t i) {
pos = i;
advance();
}
bool takeLParen();
bool peekLParen() { return Lexer(*this).takeLParen(); }
bool takeRParen();
bool peekRParen() { return Lexer(*this).takeRParen(); }
bool takeUntilParen() {
while (true) {
if (empty()) {
return false;
}
if (peekLParen() || peekRParen()) {
return true;
}
// Do not count the parentheses in strings.
if (takeString()) {
continue;
}
++pos;
advance();
}
}
std::optional<Name> takeID();
std::optional<std::string_view> takeKeyword();
bool takeKeyword(std::string_view expected);
std::optional<std::string_view> peekKeyword() {
return Lexer(*this).takeKeyword();
}
std::optional<uint64_t> takeOffset();
std::optional<uint32_t> takeAlign();
std::optional<uint64_t> takeU64() { return takeU<uint64_t>(); }
std::optional<uint64_t> takeI64() { return takeI<uint64_t>(); }
std::optional<uint32_t> takeU32() { return takeU<uint32_t>(); }
std::optional<uint32_t> takeI32() { return takeI<uint32_t>(); }
std::optional<uint16_t> takeI16() { return takeI<uint16_t>(); }
std::optional<uint8_t> takeU8() { return takeU<uint8_t>(); }
std::optional<uint8_t> takeI8() { return takeI<uint8_t>(); }
std::optional<double> takeF64();
std::optional<float> takeF32();
std::optional<std::string> takeString();
std::optional<Name> takeName() {
auto str = takeString();
if (!str || !String::isUTF8(*str)) {
return std::nullopt;
}
return Name(*str);
}
bool takeSExprStart(std::string_view expected) {
auto original = *this;
if (takeLParen() && takeKeyword(expected)) {
return true;
}
*this = original;
return false;
}
bool peekSExprStart(std::string_view expected) {
auto original = *this;
if (!takeLParen()) {
return false;
}
bool ret = takeKeyword(expected);
*this = original;
return ret;
}
std::string_view next() const { return buffer.substr(pos); }
void advance() {
annotations.clear();
skipSpace();
}
bool empty() const { return pos == buffer.size(); }
TextPos position(const char* c) const;
TextPos position(size_t i) const { return position(buffer.data() + i); }
TextPos position(std::string_view span) const {
return position(span.data());
}
TextPos position() const { return position(getPos()); }
[[nodiscard]] Err err(size_t pos, std::string reason) {
std::stringstream msg;
msg << position(pos) << ": error: " << reason;
return Err{msg.str()};
}
[[nodiscard]] Err err(std::string reason) { return err(getPos(), reason); }
const std::vector<Annotation> getAnnotations() { return annotations; }
std::vector<Annotation> takeAnnotations() { return std::move(annotations); }
void setAnnotations(std::vector<Annotation>&& annotations) {
this->annotations = std::move(annotations);
}
private:
template<typename T> std::optional<T> takeU();
template<typename T> std::optional<T> takeS();
template<typename T> std::optional<T> takeI();
void skipSpace();
};
} // namespace wasm::WATParser
#endif // parser_lexer_h
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