/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import {
  Token,
  TokenizationResult,
  TokenizationResult2,
} from '../../../../vs/editor/common/core/token';
import {
  ColorId,
  FontStyle,
  IState,
  LanguageId,
  LanguageIdentifier,
  MetadataConsts,
  StandardTokenType,
} from '../../../../vs/editor/common/modes';

class NullStateImpl implements IState {
  public clone(): IState {
    return this;
  }

  public equals(other: IState): boolean {
    return this === other;
  }
}

export const NULL_STATE: IState = new NullStateImpl();

export const NULL_MODE_ID = 'vs.editor.nullMode';

export const NULL_LANGUAGE_IDENTIFIER = new LanguageIdentifier(
  NULL_MODE_ID,
  LanguageId.Null
);

export function nullTokenize(
  modeId: string,
  buffer: string,
  state: IState,
  deltaOffset: number
): TokenizationResult {
  return new TokenizationResult([new Token(deltaOffset, '', modeId)], state);
}

export function nullTokenize2(
  languageId: LanguageId,
  buffer: string,
  state: IState | null,
  deltaOffset: number
): TokenizationResult2 {
  let tokens = new Uint32Array(2);
  tokens[0] = deltaOffset;
  tokens[1] =
    ((languageId << MetadataConsts.LANGUAGEID_OFFSET) |
      (StandardTokenType.Other << MetadataConsts.TOKEN_TYPE_OFFSET) |
      (FontStyle.None << MetadataConsts.FONT_STYLE_OFFSET) |
      (ColorId.DefaultForeground << MetadataConsts.FOREGROUND_OFFSET) |
      (ColorId.DefaultBackground << MetadataConsts.BACKGROUND_OFFSET)) >>>
    0;

  return new TokenizationResult2(tokens, state === null ? NULL_STATE : state);
}