1 |
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2 |
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3 | import { dirRE, onRE } from './parser/index'
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4 |
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5 | type Range = { start?: number, end?: number };
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6 |
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7 |
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8 |
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9 | const prohibitedKeywordRE = new RegExp('\\b' + (
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10 | 'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
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11 | 'super,throw,while,yield,delete,export,import,return,switch,default,' +
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12 | 'extends,finally,continue,debugger,function,arguments'
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13 | ).split(',').join('\\b|\\b') + '\\b')
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14 |
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15 |
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16 | const unaryOperatorsRE = new RegExp('\\b' + (
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17 | 'delete,typeof,void'
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18 | ).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)')
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19 |
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20 |
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21 | const stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g
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22 |
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23 |
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24 | export function detectErrors (ast: ?ASTNode, warn: Function) {
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25 | if (ast) {
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26 | checkNode(ast, warn)
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27 | }
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28 | }
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29 |
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30 | function checkNode (node: ASTNode, warn: Function) {
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31 | if (node.type === 1) {
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32 | for (const name in node.attrsMap) {
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33 | if (dirRE.test(name)) {
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34 | const value = node.attrsMap[name]
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35 | if (value) {
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36 | const range = node.rawAttrsMap[name]
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37 | if (name === 'v-for') {
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38 | checkFor(node, `v-for="${value}"`, warn, range)
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39 | } else if (onRE.test(name)) {
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40 | checkEvent(value, `${name}="${value}"`, warn, range)
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41 | } else {
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42 | checkExpression(value, `${name}="${value}"`, warn, range)
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43 | }
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44 | }
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45 | }
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46 | }
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47 | if (node.children) {
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48 | for (let i = 0; i < node.children.length; i++) {
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49 | checkNode(node.children[i], warn)
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50 | }
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51 | }
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52 | } else if (node.type === 2) {
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53 | checkExpression(node.expression, node.text, warn, node)
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54 | }
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55 | }
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56 |
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57 | function checkEvent (exp: string, text: string, warn: Function, range?: Range) {
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58 | const stipped = exp.replace(stripStringRE, '')
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59 | const keywordMatch: any = stipped.match(unaryOperatorsRE)
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60 | if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
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61 | warn(
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62 | `avoid using JavaScript unary operator as property name: ` +
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63 | `"${keywordMatch[0]}" in expression ${text.trim()}`,
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64 | range
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65 | )
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66 | }
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67 | checkExpression(exp, text, warn, range)
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68 | }
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69 |
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70 | function checkFor (node: ASTElement, text: string, warn: Function, range?: Range) {
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71 | checkExpression(node.for || '', text, warn, range)
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72 | checkIdentifier(node.alias, 'v-for alias', text, warn, range)
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73 | checkIdentifier(node.iterator1, 'v-for iterator', text, warn, range)
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74 | checkIdentifier(node.iterator2, 'v-for iterator', text, warn, range)
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75 | }
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76 |
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77 | function checkIdentifier (
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78 | ident: ?string,
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79 | type: string,
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80 | text: string,
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81 | warn: Function,
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82 | range?: Range
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83 | ) {
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84 | if (typeof ident === 'string') {
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85 | try {
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86 | new Function(`var ${ident}=_`)
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87 | } catch (e) {
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88 | warn(`invalid ${type} "${ident}" in expression: ${text.trim()}`, range)
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89 | }
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90 | }
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91 | }
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92 |
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93 | function checkExpression (exp: string, text: string, warn: Function, range?: Range) {
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94 | try {
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95 | new Function(`return ${exp}`)
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96 | } catch (e) {
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97 | const keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE)
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98 | if (keywordMatch) {
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99 | warn(
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100 | `avoid using JavaScript keyword as property name: ` +
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101 | `"${keywordMatch[0]}"\n Raw expression: ${text.trim()}`,
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102 | range
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103 | )
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104 | } else {
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105 | warn(
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106 | `invalid expression: ${e.message} in\n\n` +
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107 | ` ${exp}\n\n` +
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108 | ` Raw expression: ${text.trim()}\n`,
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109 | range
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110 | )
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111 | }
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112 | }
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113 | }
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