eslint-plugin-regexp
Version:
ESLint plugin for finding RegExp mistakes and RegExp style guide violations.
92 lines (91 loc) • 3.96 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const regexp_ast_analysis_1 = require("regexp-ast-analysis");
const utils_1 = require("../utils");
exports.default = (0, utils_1.createRule)("no-useless-quantifier", {
meta: {
docs: {
description: "disallow quantifiers that can be removed",
category: "Best Practices",
recommended: true,
},
fixable: "code",
schema: [],
messages: {
constOne: "Unexpected useless quantifier.",
empty: "Unexpected useless quantifier. The quantified element doesn't consume or assert characters.",
emptyQuestionMark: "Unexpected useless quantifier. The quantified element can already accept the empty string, so this quantifier is redundant.",
zeroLength: "Unexpected useless quantifier. The quantified element doesn't consume characters.",
remove: "Remove the '{{quant}}' quantifier.",
},
type: "suggestion",
hasSuggestions: true,
},
create(context) {
function createVisitor(regexpContext) {
const { node, flags, getRegexpLocation, fixReplaceNode } = regexpContext;
function fixRemoveQuant(qNode) {
return fixReplaceNode(qNode, () => {
const text = qNode.element.raw;
return (0, utils_1.canUnwrapped)(qNode, text) ? text : null;
});
}
function suggestRemoveQuant(qNode) {
const quant = qNode.raw.slice(qNode.element.end - qNode.start);
return {
messageId: "remove",
data: { quant },
fix: fixReplaceNode(qNode, () => {
const text = qNode.element.raw;
return (0, utils_1.canUnwrapped)(qNode, text) ? text : null;
}),
};
}
return {
onQuantifierEnter(qNode) {
if (qNode.min === 1 && qNode.max === 1) {
context.report({
node,
loc: getRegexpLocation(qNode),
messageId: "constOne",
fix: fixRemoveQuant(qNode),
});
return;
}
if ((0, regexp_ast_analysis_1.isEmpty)(qNode.element, flags)) {
context.report({
node,
loc: getRegexpLocation(qNode),
messageId: "empty",
suggest: [suggestRemoveQuant(qNode)],
});
return;
}
if (qNode.min === 0 &&
qNode.max === 1 &&
qNode.greedy &&
(0, regexp_ast_analysis_1.isPotentiallyEmpty)(qNode.element, flags)) {
context.report({
node,
loc: getRegexpLocation(qNode),
messageId: "emptyQuestionMark",
suggest: [suggestRemoveQuant(qNode)],
});
return;
}
if (qNode.min >= 1 && (0, regexp_ast_analysis_1.isZeroLength)(qNode.element, flags)) {
context.report({
node,
loc: getRegexpLocation(qNode),
messageId: "zeroLength",
suggest: [suggestRemoveQuant(qNode)],
});
}
},
};
}
return (0, utils_1.defineRegexpVisitor)(context, {
createVisitor,
});
},
});