lib/web/pdf_find_utils.js

/**
 * @licstart The following is the entire license notice for the
 * Javascript code in this page
 *
 * Copyright 2020 Mozilla Foundation
 *
 * 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.
 *
 * @licend The above is the entire license notice for the
 * Javascript code in this page
 */
"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getCharacterType = getCharacterType;
exports.CharacterType = void 0;
const CharacterType = {
  SPACE: 0,
  ALPHA_LETTER: 1,
  PUNCT: 2,
  HAN_LETTER: 3,
  KATAKANA_LETTER: 4,
  HIRAGANA_LETTER: 5,
  HALFWIDTH_KATAKANA_LETTER: 6,
  THAI_LETTER: 7
};
exports.CharacterType = CharacterType;

function isAlphabeticalScript(charCode) {
  return charCode < 0x2e80;
}

function isAscii(charCode) {
  return (charCode & 0xff80) === 0;
}

function isAsciiAlpha(charCode) {
  return charCode >= 0x61 && charCode <= 0x7a || charCode >= 0x41 && charCode <= 0x5a;
}

function isAsciiDigit(charCode) {
  return charCode >= 0x30 && charCode <= 0x39;
}

function isAsciiSpace(charCode) {
  return charCode === 0x20 || charCode === 0x09 || charCode === 0x0d || charCode === 0x0a;
}

function isHan(charCode) {
  return charCode >= 0x3400 && charCode <= 0x9fff || charCode >= 0xf900 && charCode <= 0xfaff;
}

function isKatakana(charCode) {
  return charCode >= 0x30a0 && charCode <= 0x30ff;
}

function isHiragana(charCode) {
  return charCode >= 0x3040 && charCode <= 0x309f;
}

function isHalfwidthKatakana(charCode) {
  return charCode >= 0xff60 && charCode <= 0xff9f;
}

function isThai(charCode) {
  return (charCode & 0xff80) === 0x0e00;
}

function getCharacterType(charCode) {
  if (isAlphabeticalScript(charCode)) {
    if (isAscii(charCode)) {
      if (isAsciiSpace(charCode)) {
        return CharacterType.SPACE;
      } else if (isAsciiAlpha(charCode) || isAsciiDigit(charCode) || charCode === 0x5f) {
        return CharacterType.ALPHA_LETTER;
      }

      return CharacterType.PUNCT;
    } else if (isThai(charCode)) {
      return CharacterType.THAI_LETTER;
    } else if (charCode === 0xa0) {
      return CharacterType.SPACE;
    }

    return CharacterType.ALPHA_LETTER;
  }

  if (isHan(charCode)) {
    return CharacterType.HAN_LETTER;
  } else if (isKatakana(charCode)) {
    return CharacterType.KATAKANA_LETTER;
  } else if (isHiragana(charCode)) {
    return CharacterType.HIRAGANA_LETTER;
  } else if (isHalfwidthKatakana(charCode)) {
    return CharacterType.HALFWIDTH_KATAKANA_LETTER;
  }

  return CharacterType.ALPHA_LETTER;
}