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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2018 The Closure Compiler 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.
 */

package com.google.javascript.jscomp.parsing.parser;

import com.google.javascript.jscomp.parsing.parser.util.SourcePosition;
import com.google.javascript.jscomp.parsing.parser.util.SourceRange;
import org.jspecify.nullness.Nullable;

/**
 * A token representing a javascript template literal substring.
 *
 * The value of the Token is the raw string. The token also stores whether this token contains
 * any error messages that should be passed to the parser due to invalid escapes or unnecessary
 * escapes. The parser, not the scanner, reports these errors because the errors are suppressed in
 * tagged template literals. The scanner does not know if it's in a tagged or untagged template lit.
 */
public class TemplateLiteralToken extends LiteralToken {
  public final @Nullable String errorMessage;
  public final SourcePosition errorPosition;
  public final ErrorLevel errorLevel;

  enum ErrorLevel {
    WARNING,
    ERROR
  }

  public TemplateLiteralToken(
      TokenType type,
      String value,
      String errorMsg,
      ErrorLevel errorLevel,
      SourcePosition position,
      SourceRange location) {
    super(type, value, location);
    this.errorMessage = errorMsg;
    this.errorLevel = errorLevel;
    this.errorPosition = position;
  }

  @Override
  public String toString() {
    return value;
  }

  public boolean hasError() {
    return ErrorLevel.ERROR.equals(errorLevel);
  }
}