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47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
"use strict";
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function createRegExpLiteral(args, prettify, t) {
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var evaluatedArgs = args.map(function (a) {
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return a.evaluate();
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});
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if (!evaluatedArgs.every(function (a) {
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return a.confident && typeof a.value === "string";
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})) {
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return;
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}
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var pattern = evaluatedArgs.length >= 1 && evaluatedArgs[0].value !== "" ? evaluatedArgs[0].value : "(?:)";
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var flags = evaluatedArgs.length >= 2 ? evaluatedArgs[1].value : "";
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pattern = new RegExp(pattern).source;
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if (prettify) {
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pattern = pattern.replace(/\n/g, "\\n").replace(/\u2028/g, "\\u2028").replace(/\u2029/g, "\\u2029").replace(/[\b]/g, "[\\b]").replace(/\v/g, "\\v").replace(/\f/g, "\\f").replace(/\r/g, "\\r");
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}
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return t.regExpLiteral(pattern, flags);
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}
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function maybeReplaceWithRegExpLiteral(path, t) {
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if (!t.isIdentifier(path.node.callee, { name: "RegExp" })) {
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return;
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}
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var regExpLiteral = createRegExpLiteral(path.get("arguments"), true, t);
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if (regExpLiteral) {
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path.replaceWith(regExpLiteral);
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}
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}
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module.exports = function (_ref) {
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var t = _ref.types;
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return {
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name: "transform-regexp-constructors",
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visitor: {
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NewExpression(path) {
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maybeReplaceWithRegExpLiteral(path, t);
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},
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CallExpression(path) {
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// equivalent to `new RegExp()` according to §21.2.3
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maybeReplaceWithRegExpLiteral(path, t);
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}
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}
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};
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}; |