124 lines
4 KiB
JavaScript
124 lines
4 KiB
JavaScript
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/**
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* @fileoverview Rule to ensure newline per method call when chaining calls
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* @author Rajendra Patil
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* @author Burak Yigit Kaya
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*/
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"use strict";
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "layout",
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docs: {
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description: "require a newline after each call in a method chain",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/newline-per-chained-call"
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},
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fixable: "whitespace",
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schema: [{
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type: "object",
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properties: {
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ignoreChainWithDepth: {
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type: "integer",
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minimum: 1,
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maximum: 10,
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default: 2
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}
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},
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additionalProperties: false
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}],
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messages: {
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expected: "Expected line break before `{{callee}}`."
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}
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},
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create(context) {
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const options = context.options[0] || {},
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ignoreChainWithDepth = options.ignoreChainWithDepth || 2;
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const sourceCode = context.getSourceCode();
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/**
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* Get the prefix of a given MemberExpression node.
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* If the MemberExpression node is a computed value it returns a
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* left bracket. If not it returns a period.
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* @param {ASTNode} node A MemberExpression node to get
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* @returns {string} The prefix of the node.
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*/
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function getPrefix(node) {
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if (node.computed) {
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if (node.optional) {
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return "?.[";
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}
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return "[";
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}
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if (node.optional) {
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return "?.";
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}
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return ".";
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}
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/**
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* Gets the property text of a given MemberExpression node.
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* If the text is multiline, this returns only the first line.
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* @param {ASTNode} node A MemberExpression node to get.
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* @returns {string} The property text of the node.
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*/
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function getPropertyText(node) {
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const prefix = getPrefix(node);
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const lines = sourceCode.getText(node.property).split(astUtils.LINEBREAK_MATCHER);
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const suffix = node.computed && lines.length === 1 ? "]" : "";
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return prefix + lines[0] + suffix;
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}
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return {
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"CallExpression:exit"(node) {
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const callee = astUtils.skipChainExpression(node.callee);
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if (callee.type !== "MemberExpression") {
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return;
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}
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let parent = astUtils.skipChainExpression(callee.object);
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let depth = 1;
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while (parent && parent.callee) {
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depth += 1;
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parent = astUtils.skipChainExpression(astUtils.skipChainExpression(parent.callee).object);
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}
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if (depth > ignoreChainWithDepth && astUtils.isTokenOnSameLine(callee.object, callee.property)) {
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const firstTokenAfterObject = sourceCode.getTokenAfter(callee.object, astUtils.isNotClosingParenToken);
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context.report({
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node: callee.property,
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loc: {
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start: firstTokenAfterObject.loc.start,
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end: callee.loc.end
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},
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messageId: "expected",
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data: {
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callee: getPropertyText(callee)
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},
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fix(fixer) {
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return fixer.insertTextBefore(firstTokenAfterObject, "\n");
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}
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});
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}
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}
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};
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}
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};
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