95 lines
3.4 KiB
JavaScript
95 lines
3.4 KiB
JavaScript
/**
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* @fileoverview Enforce newlines between operands of ternary expressions
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* @author Kai Cataldo
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*/
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"use strict";
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const astUtils = require("../util/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: "enforce newlines between operands of ternary expressions",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/multiline-ternary"
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},
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schema: [
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{
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enum: ["always", "always-multiline", "never"]
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}
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],
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messages: {
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expectedTestCons: "Expected newline between test and consequent of ternary expression.",
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expectedConsAlt: "Expected newline between consequent and alternate of ternary expression.",
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unexpectedTestCons: "Unexpected newline between test and consequent of ternary expression.",
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unexpectedConsAlt: "Unexpected newline between consequent and alternate of ternary expression."
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}
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},
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create(context) {
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const option = context.options[0];
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const multiline = option !== "never";
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const allowSingleLine = option === "always-multiline";
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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/**
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* Tests whether node is preceded by supplied tokens
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* @param {ASTNode} node - node to check
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* @param {ASTNode} parentNode - parent of node to report
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* @param {boolean} expected - whether newline was expected or not
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* @returns {void}
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* @private
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*/
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function reportError(node, parentNode, expected) {
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context.report({
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node,
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messageId: `${expected ? "expected" : "unexpected"}${node === parentNode.test ? "TestCons" : "ConsAlt"}`
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});
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}
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//--------------------------------------------------------------------------
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// Public
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//--------------------------------------------------------------------------
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return {
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ConditionalExpression(node) {
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const areTestAndConsequentOnSameLine = astUtils.isTokenOnSameLine(node.test, node.consequent);
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const areConsequentAndAlternateOnSameLine = astUtils.isTokenOnSameLine(node.consequent, node.alternate);
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if (!multiline) {
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if (!areTestAndConsequentOnSameLine) {
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reportError(node.test, node, false);
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}
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if (!areConsequentAndAlternateOnSameLine) {
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reportError(node.consequent, node, false);
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}
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} else {
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if (allowSingleLine && node.loc.start.line === node.loc.end.line) {
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return;
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}
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if (areTestAndConsequentOnSameLine) {
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reportError(node.test, node, true);
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}
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if (areConsequentAndAlternateOnSameLine) {
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reportError(node.consequent, node, true);
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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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