| // Copyright 2018 The Amber Authors. |
| // |
| // 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 SRC_TOKENIZER_H_ |
| #define SRC_TOKENIZER_H_ |
| |
| #include <cstdlib> |
| #include <memory> |
| #include <string> |
| |
| #include "amber/result.h" |
| |
| namespace amber { |
| |
| enum class TokenType : uint8_t { |
| kEOS = 0, |
| kEOL, |
| kString, |
| kInteger, |
| kDouble, |
| kHex, |
| }; |
| |
| /// A token read from the input source. |
| class Token { |
| public: |
| explicit Token(TokenType type); |
| ~Token(); |
| |
| bool IsHex() const { return type_ == TokenType::kHex; } |
| bool IsInteger() const { return type_ == TokenType::kInteger; } |
| bool IsDouble() const { return type_ == TokenType::kDouble; } |
| bool IsString() const { return type_ == TokenType::kString; } |
| bool IsEOS() const { return type_ == TokenType::kEOS; } |
| bool IsEOL() const { return type_ == TokenType::kEOL; } |
| |
| bool IsComma() const { |
| return type_ == TokenType::kString && string_value_ == ","; |
| } |
| bool IsOpenBracket() const { |
| return type_ == TokenType::kString && string_value_ == "("; |
| } |
| bool IsCloseBracket() const { |
| return type_ == TokenType::kString && string_value_ == ")"; |
| } |
| |
| void SetNegative() { is_negative_ = true; } |
| void SetStringValue(const std::string& val) { string_value_ = val; } |
| void SetUint64Value(uint64_t val) { uint_value_ = val; } |
| void SetDoubleValue(double val) { double_value_ = val; } |
| |
| const std::string& AsString() const { return string_value_; } |
| |
| uint8_t AsUint8() const { return static_cast<uint8_t>(uint_value_); } |
| uint16_t AsUint16() const { return static_cast<uint16_t>(uint_value_); } |
| uint32_t AsUint32() const { return static_cast<uint32_t>(uint_value_); } |
| uint64_t AsUint64() const { return static_cast<uint64_t>(uint_value_); } |
| |
| int8_t AsInt8() const { return static_cast<int8_t>(uint_value_); } |
| int16_t AsInt16() const { return static_cast<int16_t>(uint_value_); } |
| int32_t AsInt32() const { return static_cast<int32_t>(uint_value_); } |
| int64_t AsInt64() const { return static_cast<int64_t>(uint_value_); } |
| |
| Result ConvertToDouble(); |
| |
| float AsFloat() const { return static_cast<float>(double_value_); } |
| double AsDouble() const { return double_value_; } |
| |
| uint64_t AsHex() const { |
| return uint64_t(std::strtoull(string_value_.c_str(), nullptr, 16)); |
| } |
| |
| /// The OriginalString is set for integer and double values to store the |
| /// unparsed number which we can return in error messages. |
| void SetOriginalString(const std::string& orig_string) { |
| string_value_ = orig_string; |
| } |
| std::string ToOriginalString() const { return string_value_; } |
| |
| private: |
| TokenType type_; |
| std::string string_value_; |
| uint64_t uint_value_ = 0; |
| double double_value_ = 0.0; |
| bool is_negative_ = false; |
| }; |
| |
| /// Splits the provided input into a stream of tokens. |
| class Tokenizer { |
| public: |
| explicit Tokenizer(const std::string& data); |
| ~Tokenizer(); |
| |
| std::unique_ptr<Token> NextToken(); |
| std::string ExtractToNext(const std::string& str); |
| |
| void SetCurrentLine(size_t line) { current_line_ = line; } |
| size_t GetCurrentLine() const { return current_line_; } |
| |
| private: |
| bool IsWhitespace(char ch); |
| void SkipWhitespace(); |
| void SkipComment(); |
| |
| std::string data_; |
| size_t current_position_ = 0; |
| size_t current_line_ = 1; |
| }; |
| |
| } // namespace amber |
| |
| #endif // SRC_TOKENIZER_H_ |