68 lines
1.9 KiB
Plaintext
68 lines
1.9 KiB
Plaintext
'use strict';
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var utils = require('../utils.js');
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require('eslint-visitor-keys');
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require('espree');
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require('estraverse');
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var newParens = utils.createRule({
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name: "new-parens",
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package: "js",
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meta: {
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type: "layout",
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docs: {
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description: "Enforce or disallow parentheses when invoking a constructor with no arguments"
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},
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fixable: "code",
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schema: [
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{
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type: "string",
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enum: ["always", "never"]
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}
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],
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messages: {
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missing: "Missing '()' invoking a constructor.",
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unnecessary: "Unnecessary '()' invoking a constructor with no arguments."
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}
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},
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create(context) {
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const options = context.options;
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const always = options[0] !== "never";
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const sourceCode = context.sourceCode;
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return {
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NewExpression(node) {
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if (node.arguments.length !== 0)
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return;
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const lastToken = sourceCode.getLastToken(node);
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const hasLastParen = lastToken && utils.isClosingParenToken(lastToken);
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const tokenBeforeLastToken = sourceCode.getTokenBefore(lastToken);
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const hasParens = hasLastParen && utils.isOpeningParenToken(tokenBeforeLastToken) && node.callee.range[1] < node.range[1];
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if (always) {
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if (!hasParens) {
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context.report({
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node,
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messageId: "missing",
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fix: (fixer) => fixer.insertTextAfter(node, "()")
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});
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}
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} else {
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if (hasParens) {
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context.report({
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node,
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messageId: "unnecessary",
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fix: (fixer) => [
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fixer.remove(tokenBeforeLastToken),
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fixer.remove(lastToken),
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fixer.insertTextBefore(node, "("),
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fixer.insertTextAfter(node, ")")
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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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});
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module.exports = newParens;
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