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Viewing file:     indexes.js (4.72 KB)      -rw-r--r--

import { inRange } from './utils'
import Indexes from './encoding-indexes'

//
// 6. Indexes
//

/**
 * @param {number} pointer The |pointer| to search for.
 * @param {(!Array.<?number>|undefined)} index The |index| to search within.
 * @return {?number} The code point corresponding to |pointer| in |index|,
 *     or null if |code point| is not in |index|.
 */
export function indexCodePointFor(pointer, i) {
  if (!i) return null
  return i[pointer] || null
}

/**
 * @param {number} code_point The |code point| to search for.
 * @param {!Array.<?number>} i The |index| to search within.
 * @return {?number} The first pointer corresponding to |code point| in
 *     |index|, or null if |code point| is not in |index|.
 */
export function indexPointerFor(code_point, i) {
  var pointer = i.indexOf(code_point)
  return pointer === -1 ? null : pointer
}

/**
 * @param {string} name Name of the index.
 */
export default function index(name) {
  return Indexes[name]
}

/**
 * @param {number} pointer The |pointer| to search for in the gb18030 index.
 * @return The code point corresponding to |pointer| in |index|,
 *     or null if |code point| is not in the gb18030 index.
 */
export function indexGB18030RangesCodePointFor(pointer) {
  // 1. If pointer is greater than 39419 and less than 189000, or
  // pointer is greater than 1237575, return null.
  if ((pointer > 39419 && pointer < 189000) || (pointer > 1237575))
    return null

  // 2. If pointer is 7457, return code point U+E7C7.
  if (pointer === 7457) return 0xE7C7

  // 3. Let offset be the last pointer in index gb18030 ranges that
  // is equal to or less than pointer and let code point offset be
  // its corresponding code point.
  var offset = 0
  var code_point_offset = 0
  var idx = index('gb18030-ranges')
  var i
  for (i = 0; i < idx.length; ++i) {
    /** @type {!Array.<number>} */
    var entry = idx[i]
    if (entry[0] <= pointer) {
      offset = entry[0]
      code_point_offset = entry[1]
    } else {
      break
    }
  }

  // 4. Return a code point whose value is code point offset +
  // pointer − offset.
  return code_point_offset + pointer - offset
}

/**
 * @param {number} code_point The |code point| to locate in the gb18030 index.
 * @return {number} The first pointer corresponding to |code point| in the
 *     gb18030 index.
 */
export function indexGB18030RangesPointerFor(code_point) {
  // 1. If code point is U+E7C7, return pointer 7457.
  if (code_point === 0xE7C7) return 7457

  // 2. Let offset be the last code point in index gb18030 ranges
  // that is equal to or less than code point and let pointer offset
  // be its corresponding pointer.
  var offset = 0
  var pointer_offset = 0
  var idx = index('gb18030-ranges')
  var i
  for (i = 0; i < idx.length; ++i) {
    /** @type {!Array.<number>} */
    var entry = idx[i]
    if (entry[1] <= code_point) {
      offset = entry[1]
      pointer_offset = entry[0]
    } else {
      break
    }
  }

  // 3. Return a pointer whose value is pointer offset + code point
  // − offset.
  return pointer_offset + code_point - offset
}

/**
 * @param {number} code_point The |code_point| to search for in the Shift_JIS
 *     index.
 * @return {?number} The code point corresponding to |pointer| in |index|,
 *     or null if |code point| is not in the Shift_JIS index.
 */
export function indexShiftJISPointerFor(code_point) {
  // 1. Let index be index jis0208 excluding all entries whose
  // pointer is in the range 8272 to 8835, inclusive.
  shift_jis_index = shift_jis_index ||
    index('jis0208').map((cp, pointer) => {
      return inRange(pointer, 8272, 8835) ? null : cp
    })
  const index_ = shift_jis_index

  // 2. Return the index pointer for code point in index.
  return index_.indexOf(code_point)
}
var shift_jis_index

/**
 * @param {number} code_point The |code_point| to search for in the big5
 *     index.
 * @return {?number} The code point corresponding to |pointer| in |index|,
 *     or null if |code point| is not in the big5 index.
 */
export function indexBig5PointerFor(code_point) {
  // 1. Let index be index Big5 excluding all entries whose pointer
  big5_index_no_hkscs = big5_index_no_hkscs ||
    index('big5').map((cp, pointer) => {
      return (pointer < (0xA1 - 0x81) * 157) ? null : cp
    })
  var index_ = big5_index_no_hkscs

  // 2. If code point is U+2550, U+255E, U+2561, U+256A, U+5341, or
  // U+5345, return the last pointer corresponding to code point in
  // index.
  if (code_point === 0x2550 || code_point === 0x255E ||
      code_point === 0x2561 || code_point === 0x256A ||
      code_point === 0x5341 || code_point === 0x5345) {
    return index_.lastIndexOf(code_point)
  }

  // 3. Return the index pointer for code point in index.
  return indexPointerFor(code_point, index_)
}

var big5_index_no_hkscs