100 lines
2.9 KiB
JavaScript
100 lines
2.9 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = simplifyAccess;
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var _t = require("@babel/types");
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const {
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LOGICAL_OPERATORS,
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assignmentExpression,
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binaryExpression,
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cloneNode,
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identifier,
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logicalExpression,
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numericLiteral,
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sequenceExpression,
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unaryExpression
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} = _t;
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function simplifyAccess(path, bindingNames, includeUpdateExpression = true) {
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path.traverse(simpleAssignmentVisitor, {
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scope: path.scope,
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bindingNames,
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seen: new WeakSet(),
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includeUpdateExpression
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});
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}
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const simpleAssignmentVisitor = {
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UpdateExpression: {
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exit(path) {
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const {
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scope,
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bindingNames,
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includeUpdateExpression
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} = this;
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if (!includeUpdateExpression) {
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return;
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}
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const arg = path.get("argument");
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if (!arg.isIdentifier()) return;
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const localName = arg.node.name;
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if (!bindingNames.has(localName)) return;
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if (scope.getBinding(localName) !== path.scope.getBinding(localName)) {
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return;
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}
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if (path.parentPath.isExpressionStatement() && !path.isCompletionRecord()) {
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const operator = path.node.operator == "++" ? "+=" : "-=";
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path.replaceWith(assignmentExpression(operator, arg.node, numericLiteral(1)));
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} else if (path.node.prefix) {
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path.replaceWith(assignmentExpression("=", identifier(localName), binaryExpression(path.node.operator[0], unaryExpression("+", arg.node), numericLiteral(1))));
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} else {
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const old = path.scope.generateUidIdentifierBasedOnNode(arg.node, "old");
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const varName = old.name;
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path.scope.push({
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id: old
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});
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const binary = binaryExpression(path.node.operator[0], identifier(varName), numericLiteral(1));
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path.replaceWith(sequenceExpression([assignmentExpression("=", identifier(varName), unaryExpression("+", arg.node)), assignmentExpression("=", cloneNode(arg.node), binary), identifier(varName)]));
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}
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}
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},
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AssignmentExpression: {
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exit(path) {
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const {
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scope,
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seen,
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bindingNames
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} = this;
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if (path.node.operator === "=") return;
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if (seen.has(path.node)) return;
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seen.add(path.node);
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const left = path.get("left");
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if (!left.isIdentifier()) return;
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const localName = left.node.name;
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if (!bindingNames.has(localName)) return;
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if (scope.getBinding(localName) !== path.scope.getBinding(localName)) {
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return;
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}
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const operator = path.node.operator.slice(0, -1);
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if (LOGICAL_OPERATORS.includes(operator)) {
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path.replaceWith(logicalExpression(operator, path.node.left, assignmentExpression("=", cloneNode(path.node.left), path.node.right)));
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} else {
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path.node.right = binaryExpression(operator, cloneNode(path.node.left), path.node.right);
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path.node.operator = "=";
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}
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}
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}
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};
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