88 lines
3.1 KiB
JavaScript
88 lines
3.1 KiB
JavaScript
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/**
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* @fileoverview enforce the location of arrow function bodies
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* @author Sharmila Jesupaul
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*/
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"use strict";
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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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docs: {
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description: "enforce the location of arrow function bodies",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/implicit-arrow-linebreak"
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},
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fixable: "whitespace",
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schema: [
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{
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enum: ["beside", "below"]
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}
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]
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},
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create(context) {
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const sourceCode = context.getSourceCode();
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//----------------------------------------------------------------------
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// Helpers
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//----------------------------------------------------------------------
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/**
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* Gets the applicable preference for a particular keyword
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* @returns {string} The applicable option for the keyword, e.g. 'beside'
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*/
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function getOption() {
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return context.options[0] || "beside";
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}
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/**
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* Validates the location of an arrow function body
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* @param {ASTNode} node The arrow function body
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* @param {string} keywordName The applicable keyword name for the arrow function body
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* @returns {void}
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*/
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function validateExpression(node) {
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const option = getOption();
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let tokenBefore = sourceCode.getTokenBefore(node.body);
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const hasParens = tokenBefore.value === "(";
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if (node.type === "BlockStatement") {
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return;
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}
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let fixerTarget = node.body;
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if (hasParens) {
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// Gets the first token before the function body that is not an open paren
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tokenBefore = sourceCode.getTokenBefore(node.body, token => token.value !== "(");
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fixerTarget = sourceCode.getTokenAfter(tokenBefore);
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}
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if (tokenBefore.loc.end.line === fixerTarget.loc.start.line && option === "below") {
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context.report({
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node: fixerTarget,
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message: "Expected a linebreak before this expression.",
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fix: fixer => fixer.insertTextBefore(fixerTarget, "\n")
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});
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} else if (tokenBefore.loc.end.line !== fixerTarget.loc.start.line && option === "beside") {
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context.report({
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node: fixerTarget,
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message: "Expected no linebreak before this expression.",
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fix: fixer => fixer.replaceTextRange([tokenBefore.range[1], fixerTarget.range[0]], " ")
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});
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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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ArrowFunctionExpression: node => validateExpression(node)
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};
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}
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};
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