token.h

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/*
 * Copyright 2026 The A11 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 A11_FLOW_TOKEN_H_
#define A11_FLOW_TOKEN_H_
 
#include <cstddef>
#include <string>
#include <string_view>
 
#include <absl/time/time.h>
 
namespace a11::flow {
 
enum class TokenKind {
  kNewline,
  kComment,
  kString,
  kNumber,
  kDuration,
  kWord,
 
  kDot,
  kRange,
  kSpread,
  kArrow,
  kCarry,
  kEqual,
  kEqualEqual,
  kBangEqual,
  kLess,
  kLessEqual,
  kGreater,
  kGreaterEqual,
  kPlus,
  kMinus,
  kPipe,
  kColon,
  kComma,
  kLeftBrace,
  kRightBrace,
  kLeftParen,
  kRightParen,
  kLeftBracket,
  kRightBracket,
 
  kBad,
  kEnd,
};
 
struct Token {
  TokenKind kind = TokenKind::kEnd;
  std::string_view text;
  size_t start = 0;
  size_t end = 0;
  int line = 1;
  int column = 1;
 
  std::string string_value;
  double number = 0.0;
  bool is_integer = false;
  absl::Duration duration;
 
  [[nodiscard]] bool IsWord() const { return kind == TokenKind::kWord; }
 
  [[nodiscard]] bool EndsStatement() const {
    return kind == TokenKind::kNewline || kind == TokenKind::kRightBrace ||
           kind == TokenKind::kEnd;
  }
};
 
std::string_view KindName(TokenKind kind);
 
TokenKind KindFromName(std::string_view name);
 
}  // namespace a11::flow
 
#endif  // A11_FLOW_TOKEN_H_