1 | 'use strict';
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2 |
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3 | const utils = require('handlebars-utils');
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4 |
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5 | function helper(paper) {
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6 | paper.handlebars.registerHelper('unless', function () {
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7 | const options = arguments[arguments.length - 1];
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8 | arguments[arguments.length - 1] = Object.assign({}, options, {
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9 | fn: options.inverse || (() => false),
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10 | inverse: options.fn || (() => true),
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11 | hash: options.hash
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12 | });
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13 |
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14 | return paper.handlebars.helpers['if'].apply(this, arguments);
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15 | });
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16 |
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17 | paper.handlebars.registerHelper('if', function (lvalue, operator, rvalue) {
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18 | const options = arguments[arguments.length - 1];
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19 | let result;
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20 |
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21 |
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22 | if (utils.isOptions(operator)) {
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23 |
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24 | if (utils.isArray(lvalue)) {
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25 | result = !!lvalue.length;
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26 | }
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27 |
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28 | else if (utils.isEmpty(lvalue) && utils.isObject(lvalue)) {
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29 | result = false;
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30 | }
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31 |
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32 | else {
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33 | result = !!lvalue;
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34 | }
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35 | } else {
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36 |
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37 | if (utils.isOptions(rvalue)) {
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38 |
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39 |
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40 | rvalue = operator;
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41 | operator = options.hash.operator || "==";
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42 | }
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43 |
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44 | switch (operator) {
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45 | case '==':
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46 | result = (lvalue == rvalue);
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47 | break;
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48 |
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49 | case '===':
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50 | result = (lvalue === rvalue);
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51 | break;
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52 |
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53 | case '!=':
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54 | result = (lvalue != rvalue);
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55 | break;
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56 |
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57 | case '!==':
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58 | result = (lvalue !== rvalue);
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59 | break;
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60 |
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61 | case '<':
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62 | result = (lvalue < rvalue);
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63 | break;
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64 |
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65 | case '>':
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66 | result = (lvalue > rvalue);
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67 | break;
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68 |
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69 | case '<=':
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70 | result = (lvalue <= rvalue);
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71 | break;
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72 |
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73 | case '>=':
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74 | result = (lvalue >= rvalue);
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75 | break;
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76 |
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77 | case 'gtnum':
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78 | if (typeof lvalue === 'string' && typeof(rvalue) === 'string' && !isNaN(lvalue) && !isNaN(rvalue)) {
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79 | result = parseInt(lvalue) > parseInt(rvalue);
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80 | } else {
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81 | throw new Error("if gtnum only accepts numbers (as strings)");
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82 | }
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83 | break;
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84 |
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85 | case 'typeof':
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86 | result = (typeof lvalue === rvalue);
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87 | break;
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88 |
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89 | default:
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90 | throw new Error("Handlerbars Helper 'if' doesn't know the operator " + operator);
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91 | }
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92 | }
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93 |
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94 | if (!options.fn || !options.inverse) {
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95 | options.fn = () => true;
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96 | options.inverse = () => false;
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97 | }
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98 |
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99 | if (result) {
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100 | return options.fn(this);
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101 | } else {
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102 | return options.inverse(this);
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103 | }
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104 | });
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105 | }
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106 |
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107 | module.exports = helper;
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