1 | var toString = require('../lang/toString');
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2 | var WHITE_SPACES = require('./WHITE_SPACES');
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3 | |
4 |
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5 |
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6 | function ltrim(str, chars) {
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7 | str = toString(str);
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8 | chars = chars || WHITE_SPACES;
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9 |
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10 | var start = 0,
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11 | len = str.length,
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12 | charLen = chars.length,
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13 | found = true,
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14 | i, c;
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15 |
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16 | while (found && start < len) {
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17 | found = false;
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18 | i = -1;
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19 | c = str.charAt(start);
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20 |
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21 | while (++i < charLen) {
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22 | if (c === chars[i]) {
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23 | found = true;
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24 | start++;
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25 | break;
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26 | }
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27 | }
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28 | }
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29 |
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30 | return (start >= len) ? '' : str.substr(start, len);
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31 | }
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32 |
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33 | module.exports = ltrim;
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34 |
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