precis-js/lib/unicode/CodepointPropertyReader.js

A JavaScript implementation of RFC 7564 (The PRECIS Framework).

// Generated by CoffeeScript 1.10.0
(function() {
  var CodepointPropertyReader, bidiBits, bidiMask, bidiShift, bits, log2, precis, precisBits, precisMask, precisShift;

  precis = require('../constants');


  /* !pragma coverage-skip-next */

  log2 = Math.log2 || function(n) {
    return Math.log(n) / Math.LN2;
  };

  bits = function(n) {
    return (log2(n) + 1) | 0;
  };

  precisBits = bits(Object.keys(precis.PRECIS_CATEGORY).length - 1);

  bidiBits = bits(Object.keys(precis.BIDI_CLASS).length - 1);

  precisShift = bidiBits + 1;

  bidiShift = 1;

  precisMask = (1 << precisBits) - 1;

  bidiMask = (1 << bidiBits) - 1;

  module.exports = CodepointPropertyReader = (function() {
    function CodepointPropertyReader(trie) {
      this.trie = trie;
    }

    CodepointPropertyReader.prototype.precisCategory = function(codepoint) {
      var data;
      data = this.trie.get(codepoint);
      return (data >> precisShift) & precisMask;
    };

    CodepointPropertyReader.prototype.bidiClass = function(codepoint) {
      var data;
      data = this.trie.get(codepoint);
      return (data >> bidiShift) & bidiMask;
    };

    CodepointPropertyReader.prototype.isNonAsciiSpace = function(codepoint) {
      var data;
      data = this.trie.get(codepoint);
      return data & 1;
    };

    return CodepointPropertyReader;

  })();

}).call(this);