1 | /**
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2 | * @fileoverview Rule to ensure newline per method call when chaining calls
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3 | * @author Rajendra Patil
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4 | * @author Burak Yigit Kaya
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5 | */
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6 |
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7 | ;
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8 |
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9 | const astUtils = require("../ast-utils");
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10 |
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11 | //------------------------------------------------------------------------------
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12 | // Rule Definition
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13 | //------------------------------------------------------------------------------
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14 |
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15 | module.exports = {
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16 | meta: {
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17 | docs: {
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18 | description: "require a newline after each call in a method chain",
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19 | category: "Stylistic Issues",
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20 | recommended: false,
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21 | url: "https://eslint.org/docs/rules/newline-per-chained-call"
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22 | },
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23 | fixable: "whitespace",
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24 | schema: [{
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25 | type: "object",
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26 | properties: {
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27 | ignoreChainWithDepth: {
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28 | type: "integer",
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29 | minimum: 1,
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30 | maximum: 10
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31 | }
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32 | },
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33 | additionalProperties: false
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34 | }]
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35 | },
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36 |
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37 | create(context) {
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38 |
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39 | const options = context.options[0] || {},
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40 | ignoreChainWithDepth = options.ignoreChainWithDepth || 2;
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41 |
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42 | const sourceCode = context.getSourceCode();
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43 |
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44 | /**
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45 | * Get the prefix of a given MemberExpression node.
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46 | * If the MemberExpression node is a computed value it returns a
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47 | * left bracket. If not it returns a period.
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48 | *
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49 | * @param {ASTNode} node - A MemberExpression node to get
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50 | * @returns {string} The prefix of the node.
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51 | */
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52 | function getPrefix(node) {
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53 | return node.computed ? "[" : ".";
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54 | }
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55 |
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56 | /**
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57 | * Gets the property text of a given MemberExpression node.
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58 | * If the text is multiline, this returns only the first line.
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59 | *
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60 | * @param {ASTNode} node - A MemberExpression node to get.
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61 | * @returns {string} The property text of the node.
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62 | */
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63 | function getPropertyText(node) {
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64 | const prefix = getPrefix(node);
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65 | const lines = sourceCode.getText(node.property).split(astUtils.LINEBREAK_MATCHER);
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66 | const suffix = node.computed && lines.length === 1 ? "]" : "";
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67 |
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68 | return prefix + lines[0] + suffix;
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69 | }
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70 |
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71 | return {
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72 | "CallExpression:exit"(node) {
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73 | if (!node.callee || node.callee.type !== "MemberExpression") {
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74 | return;
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75 | }
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76 |
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77 | const callee = node.callee;
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78 | let parent = callee.object;
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79 | let depth = 1;
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80 |
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81 | while (parent && parent.callee) {
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82 | depth += 1;
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83 | parent = parent.callee.object;
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84 | }
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85 |
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86 | if (depth > ignoreChainWithDepth && astUtils.isTokenOnSameLine(callee.object, callee.property)) {
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87 | context.report({
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88 | node: callee.property,
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89 | loc: callee.property.loc.start,
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90 | message: "Expected line break before `{{callee}}`.",
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91 | data: {
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92 | callee: getPropertyText(callee)
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93 | },
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94 | fix(fixer) {
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95 | const firstTokenAfterObject = sourceCode.getTokenAfter(callee.object, astUtils.isNotClosingParenToken);
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96 |
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97 | return fixer.insertTextBefore(firstTokenAfterObject, "\n");
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98 | }
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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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