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6 | 'use strict';
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7 |
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8 | const docsUrl = require('../util/docsUrl');
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9 |
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13 |
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14 | module.exports = {
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15 | meta: {
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16 | docs: {
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17 | description: 'Limit maximum of props on a single line in JSX',
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18 | category: 'Stylistic Issues',
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19 | recommended: false,
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20 | url: docsUrl('jsx-max-props-per-line')
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21 | },
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22 | fixable: 'code',
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23 | schema: [{
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24 | type: 'object',
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25 | properties: {
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26 | maximum: {
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27 | type: 'integer',
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28 | minimum: 1
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29 | },
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30 | when: {
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31 | type: 'string',
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32 | enum: ['always', 'multiline']
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33 | }
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34 | }
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35 | }]
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36 | },
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37 |
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38 | create(context) {
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39 | const configuration = context.options[0] || {};
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40 | const maximum = configuration.maximum || 1;
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41 | const when = configuration.when || 'always';
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42 |
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43 | function getPropName(propNode) {
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44 | if (propNode.type === 'JSXSpreadAttribute') {
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45 | return context.getSourceCode().getText(propNode.argument);
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46 | }
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47 | return propNode.name.name;
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48 | }
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49 |
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50 | function generateFixFunction(line, max) {
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51 | const sourceCode = context.getSourceCode();
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52 | const output = [];
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53 | const front = line[0].range[0];
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54 | const back = line[line.length - 1].range[1];
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55 | for (let i = 0; i < line.length; i += max) {
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56 | const nodes = line.slice(i, i + max);
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57 | output.push(nodes.reduce((prev, curr) => {
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58 | if (prev === '') {
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59 | return sourceCode.getText(curr);
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60 | }
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61 | return `${prev} ${sourceCode.getText(curr)}`;
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62 | }, ''));
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63 | }
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64 | const code = output.join('\n');
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65 | return function fix(fixer) {
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66 | return fixer.replaceTextRange([front, back], code);
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67 | };
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68 | }
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69 |
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70 | return {
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71 | JSXOpeningElement(node) {
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72 | if (!node.attributes.length) {
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73 | return;
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74 | }
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75 |
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76 | if (when === 'multiline' && node.loc.start.line === node.loc.end.line) {
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77 | return;
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78 | }
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79 |
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80 | const firstProp = node.attributes[0];
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81 | const linePartitionedProps = [[firstProp]];
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82 |
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83 | node.attributes.reduce((last, decl) => {
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84 | if (last.loc.end.line === decl.loc.start.line) {
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85 | linePartitionedProps[linePartitionedProps.length - 1].push(decl);
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86 | } else {
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87 | linePartitionedProps.push([decl]);
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88 | }
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89 | return decl;
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90 | });
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91 |
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92 | linePartitionedProps.forEach((propsInLine) => {
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93 | if (propsInLine.length > maximum) {
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94 | const name = getPropName(propsInLine[maximum]);
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95 | context.report({
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96 | node: propsInLine[maximum],
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97 | message: `Prop \`${name}\` must be placed on a new line`,
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98 | fix: generateFixFunction(propsInLine, maximum)
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99 | });
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100 | }
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101 | });
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102 | }
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103 | };
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104 | }
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105 | };
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