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27 | var assert = require('assert');
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28 | var defaultOperators = require('../utils').unaryOperators;
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29 |
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30 | module.exports = function() {};
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31 |
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32 | module.exports.prototype = {
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33 |
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34 | configure: function(operators) {
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35 | var isTrue = operators === true;
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36 |
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37 | assert(
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38 | Array.isArray(operators) || isTrue,
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39 | this.getOptionName() + ' option requires array or true value'
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40 | );
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41 |
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42 | if (isTrue) {
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43 | operators = defaultOperators;
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44 | }
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45 |
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46 | this._operatorIndex = {};
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47 | for (var i = 0, l = operators.length; i < l; i++) {
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48 | this._operatorIndex[operators[i]] = true;
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49 | }
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50 | },
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51 |
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52 | getOptionName: function() {
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53 | return 'requireSpaceAfterPrefixUnaryOperators';
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54 | },
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55 |
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56 | check: function(file, errors) {
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57 | var operatorIndex = this._operatorIndex;
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58 |
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59 | file.iterateNodesByType(['UnaryExpression', 'UpdateExpression'], function(node) {
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60 |
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61 | if (node.prefix && operatorIndex[node.operator]) {
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62 | var argument = node.argument.type;
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63 | var operatorToken = node.getFirstToken();
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64 | var nextToken = file.getNextToken(operatorToken);
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65 |
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66 |
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67 | if (
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68 | argument === 'UnaryExpression' || argument === 'UpdateExpression' &&
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69 | nextToken.value !== '('
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70 | ) {
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71 | return;
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72 | }
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73 |
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74 | errors.assert.whitespaceBetween({
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75 | token: operatorToken,
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76 | nextToken: nextToken,
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77 | message: 'Operator ' + node.operator + ' should not stick to operand'
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78 | });
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79 | }
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80 | });
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81 | }
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82 | };
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