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/** * @fileoverview enforce the location of single-line statements * @author Teddy Katz * @deprecated in ESLint v8.53.0 */ "use strict"; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ const POSITION_SCHEMA = { enum: ["beside", "below", "any"] }; /** @type {import('../shared/types').Rule} */ module.exports = { meta: { deprecated: true, replacedBy: [], type: "layout", docs: { description: "Enforce the location of single-line statements", recommended: false, url: "https://eslint.org/docs/latest/rules/nonblock-statement-body-position" }, fixable: "whitespace", schema: [ POSITION_SCHEMA, { properties: { overrides: { properties: { if: POSITION_SCHEMA, else: POSITION_SCHEMA, while: POSITION_SCHEMA, do: POSITION_SCHEMA, for: POSITION_SCHEMA }, additionalProperties: false } }, additionalProperties: false } ], messages: { expectNoLinebreak: "Expected no linebreak before this statement.", expectLinebreak: "Expected a linebreak before this statement." } }, create(context) { const sourceCode = context.sourceCode; //---------------------------------------------------------------------- // Helpers //---------------------------------------------------------------------- /** * Gets the applicable preference for a particular keyword * @param {string} keywordName The name of a keyword, e.g. 'if' * @returns {string} The applicable option for the keyword, e.g. 'beside' */ function getOption(keywordName) { return context.options[1] && context.options[1].overrides && context.options[1].overrides[keywordName] || context.options[0] || "beside"; } /** * Validates the location of a single-line statement * @param {ASTNode} node The single-line statement * @param {string} keywordName The applicable keyword name for the single-line statement * @returns {void} */ function validateStatement(node, keywordName) { const option = getOption(keywordName); if (node.type === "BlockStatement" || option === "any") { return; } const tokenBefore = sourceCode.getTokenBefore(node); if (tokenBefore.loc.end.line === node.loc.start.line && option === "below") { context.report({ node, messageId: "expectLinebreak", fix: fixer => fixer.insertTextBefore(node, "\n") }); } else if (tokenBefore.loc.end.line !== node.loc.start.line && option === "beside") { context.report({ node, messageId: "expectNoLinebreak", fix(fixer) { if (sourceCode.getText().slice(tokenBefore.range[1], node.range[0]).trim()) { return null; } return fixer.replaceTextRange([tokenBefore.range[1], node.range[0]], " "); } }); } } //---------------------------------------------------------------------- // Public //---------------------------------------------------------------------- return { IfStatement(node) { validateStatement(node.consequent, "if"); // Check the `else` node, but don't check 'else if' statements. if (node.alternate && node.alternate.type !== "IfStatement") { validateStatement(node.alternate, "else"); } }, WhileStatement: node => validateStatement(node.body, "while"), DoWhileStatement: node => validateStatement(node.body, "do"), ForStatement: node => validateStatement(node.body, "for"), ForInStatement: node => validateStatement(node.body, "for"), ForOfStatement: node => validateStatement(node.body, "for") }; } };