91 lines
3.9 KiB
JavaScript
91 lines
3.9 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const regexp_ast_analysis_1 = require("regexp-ast-analysis");
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const utils_1 = require("../utils");
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exports.default = (0, utils_1.createRule)("no-useless-quantifier", {
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meta: {
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docs: {
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description: "disallow quantifiers that can be removed",
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category: "Best Practices",
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recommended: true,
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},
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fixable: "code",
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schema: [],
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messages: {
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constOne: "Unexpected useless quantifier.",
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empty: "Unexpected useless quantifier. The quantified element doesn't consume or assert characters.",
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emptyQuestionMark: "Unexpected useless quantifier. The quantified element can already accept the empty string, so this quantifier is redundant.",
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zeroLength: "Unexpected useless quantifier. The quantified element doesn't consume characters.",
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remove: "Remove the '{{quant}}' quantifier.",
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},
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type: "suggestion",
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hasSuggestions: true,
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},
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create(context) {
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function createVisitor(regexpContext) {
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const { node, flags, getRegexpLocation, fixReplaceNode } = regexpContext;
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function fixRemoveQuant(qNode) {
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return fixReplaceNode(qNode, () => {
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const text = qNode.element.raw;
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return (0, utils_1.canUnwrapped)(qNode, text) ? text : null;
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});
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}
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function suggestRemoveQuant(qNode) {
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const quant = qNode.raw.slice(qNode.element.end - qNode.start);
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return {
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messageId: "remove",
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data: { quant },
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fix: fixReplaceNode(qNode, () => {
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const text = qNode.element.raw;
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return (0, utils_1.canUnwrapped)(qNode, text) ? text : null;
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}),
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};
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}
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return {
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onQuantifierEnter(qNode) {
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if (qNode.min === 1 && qNode.max === 1) {
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context.report({
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node,
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loc: getRegexpLocation(qNode),
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messageId: "constOne",
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fix: fixRemoveQuant(qNode),
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});
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return;
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}
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if ((0, regexp_ast_analysis_1.isEmpty)(qNode.element, flags)) {
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context.report({
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node,
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loc: getRegexpLocation(qNode),
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messageId: "empty",
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suggest: [suggestRemoveQuant(qNode)],
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});
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return;
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}
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if (qNode.min === 0 &&
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qNode.max === 1 &&
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qNode.greedy &&
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(0, regexp_ast_analysis_1.isPotentiallyEmpty)(qNode.element, flags)) {
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context.report({
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node,
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loc: getRegexpLocation(qNode),
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messageId: "emptyQuestionMark",
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suggest: [suggestRemoveQuant(qNode)],
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});
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return;
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}
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if (qNode.min >= 1 && (0, regexp_ast_analysis_1.isZeroLength)(qNode.element, flags)) {
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context.report({
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node,
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loc: getRegexpLocation(qNode),
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messageId: "zeroLength",
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suggest: [suggestRemoveQuant(qNode)],
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});
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}
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},
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};
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}
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return (0, utils_1.defineRegexpVisitor)(context, {
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createVisitor,
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});
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},
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});
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