120 lines
4.3 KiB
JavaScript
120 lines
4.3 KiB
JavaScript
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/**
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* @fileoverview enforce the location of single-line statements
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* @author Teddy Katz
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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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const POSITION_SCHEMA = { enum: ["beside", "below", "any"] };
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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 the location of single-line statements",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/nonblock-statement-body-position"
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},
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fixable: "whitespace",
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schema: [
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POSITION_SCHEMA,
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{
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properties: {
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overrides: {
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properties: {
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if: POSITION_SCHEMA,
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else: POSITION_SCHEMA,
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while: POSITION_SCHEMA,
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do: POSITION_SCHEMA,
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for: POSITION_SCHEMA
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},
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additionalProperties: false
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}
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},
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additionalProperties: false
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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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* @param {string} keywordName The name of a keyword, e.g. 'if'
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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(keywordName) {
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return context.options[1] && context.options[1].overrides && context.options[1].overrides[keywordName] ||
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context.options[0] ||
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"beside";
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}
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/**
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* Validates the location of a single-line statement
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* @param {ASTNode} node The single-line statement
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* @param {string} keywordName The applicable keyword name for the single-line statement
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* @returns {void}
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*/
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function validateStatement(node, keywordName) {
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const option = getOption(keywordName);
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if (node.type === "BlockStatement" || option === "any") {
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return;
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}
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const tokenBefore = sourceCode.getTokenBefore(node);
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if (tokenBefore.loc.end.line === node.loc.start.line && option === "below") {
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context.report({
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node,
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message: "Expected a linebreak before this statement.",
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fix: fixer => fixer.insertTextBefore(node, "\n")
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});
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} else if (tokenBefore.loc.end.line !== node.loc.start.line && option === "beside") {
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context.report({
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node,
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message: "Expected no linebreak before this statement.",
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fix(fixer) {
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if (sourceCode.getText().slice(tokenBefore.range[1], node.range[0]).trim()) {
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return null;
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}
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return fixer.replaceTextRange([tokenBefore.range[1], node.range[0]], " ");
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}
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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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IfStatement(node) {
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validateStatement(node.consequent, "if");
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// Check the `else` node, but don't check 'else if' statements.
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if (node.alternate && node.alternate.type !== "IfStatement") {
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validateStatement(node.alternate, "else");
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}
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},
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WhileStatement: node => validateStatement(node.body, "while"),
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DoWhileStatement: node => validateStatement(node.body, "do"),
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ForStatement: node => validateStatement(node.body, "for"),
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ForInStatement: node => validateStatement(node.body, "for"),
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ForOfStatement: node => validateStatement(node.body, "for")
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};
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}
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};
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