xpl / printable-characters

build/printable-characters.js

"use strict";

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

The assignment of undefined is not necessary as _e is implicitly marked as undefined by the declaration.

Usage of the throw statement in a finally clause is discouraged. This construct may mask errors and makes debugging difficult.

Curly braces around statements make for more readable code and help prevent bugs when you add further statements.

The variable Symbol seems to be never declared. If this is a global, consider adding a /** global: Symbol */ comment.

const ansiEscapeCode = '[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-PRZcf-nqry=><]',
      zeroWidthCharacterExceptNewline = '\u0000-\u0008\u000B-\u0019\u001b\u009b\u00ad\u200b\u2028\u2029\ufeff\ufe00-\ufe0f',
      zeroWidthCharacter = '\n' + zeroWidthCharacterExceptNewline,
      zeroWidthCharactersExceptNewline = new RegExp('(?:' + ansiEscapeCode + ')|[' + zeroWidthCharacterExceptNewline + ']', 'g'),
      zeroWidthCharacters = new RegExp('(?:' + ansiEscapeCode + ')|[' + zeroWidthCharacter + ']', 'g'),
      partition = new RegExp('((?:' + ansiEscapeCode + ')|[\t' + zeroWidthCharacter + '])?([^\t' + zeroWidthCharacter + ']*)', 'g');

module.exports = {

    zeroWidthCharacters,

    ansiEscapeCodes: new RegExp(ansiEscapeCode, 'g'),

    strlen: s => Array.from(s.replace(zeroWidthCharacters, '')).length, // Array.from solves the emoji problem as described here: http://blog.jonnew.com/posts/poo-dot-length-equals-two

    isBlank: s => s.replace(zeroWidthCharacters, '').replace(/\s/g, '').length === 0,

    blank: s => Array.from(s.replace(zeroWidthCharactersExceptNewline, '')) // Array.from solves the emoji problem as described here: http://blog.jonnew.com/posts/poo-dot-length-equals-two
    .map(x => x === '\t' || x === '\n' ? x : ' ').join(''),

    partition(s) {
        for (var m, spans = []; partition.lastIndex !== s.length && (m = partition.exec(s));) {
            spans.push([m[1] || '', m[2]]);
        }
        partition.lastIndex = 0; // reset
        return spans;
    },

    first(s, n) {

        let result = '',
            length = 0;

        for (const _ref of module.exports.partition(s)) {
            var _ref2 = _slicedToArray(_ref, 2);

            const nonPrintable = _ref2[0];
            const printable = _ref2[1];

            const text = Array.from(printable).slice(0, n - length); // Array.from solves the emoji problem as described here: http://blog.jonnew.com/posts/poo-dot-length-equals-two
            result += nonPrintable + text.join('');
            length += text.length;
        }

        return result;
    }
};

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