1 | "use strict";
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = simplifyAccess;
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7 | var _t = require("@babel/types");
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8 | const {
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9 | LOGICAL_OPERATORS,
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10 | assignmentExpression,
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11 | binaryExpression,
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12 | cloneNode,
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13 | identifier,
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14 | logicalExpression,
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15 | numericLiteral,
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16 | sequenceExpression,
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17 | unaryExpression
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18 | } = _t;
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19 | const simpleAssignmentVisitor = {
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20 | AssignmentExpression: {
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21 | exit(path) {
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22 | const {
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23 | scope,
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24 | seen,
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25 | bindingNames
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26 | } = this;
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27 | if (path.node.operator === "=") return;
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28 | if (seen.has(path.node)) return;
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29 | seen.add(path.node);
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30 | const left = path.get("left");
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31 | if (!left.isIdentifier()) return;
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32 | const localName = left.node.name;
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33 | if (!bindingNames.has(localName)) return;
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34 | if (scope.getBinding(localName) !== path.scope.getBinding(localName)) {
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35 | return;
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36 | }
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37 | const operator = path.node.operator.slice(0, -1);
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38 | if (LOGICAL_OPERATORS.includes(operator)) {
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39 | path.replaceWith(logicalExpression(operator, path.node.left, assignmentExpression("=", cloneNode(path.node.left), path.node.right)));
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40 | } else {
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41 | path.node.right = binaryExpression(operator, cloneNode(path.node.left), path.node.right);
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42 | path.node.operator = "=";
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43 | }
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44 | }
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45 | }
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46 | };
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47 | {
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48 | simpleAssignmentVisitor.UpdateExpression = {
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49 | exit(path) {
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50 | if (!this.includeUpdateExpression) return;
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51 | const {
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52 | scope,
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53 | bindingNames
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54 | } = this;
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55 | const arg = path.get("argument");
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56 | if (!arg.isIdentifier()) return;
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57 | const localName = arg.node.name;
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58 | if (!bindingNames.has(localName)) return;
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59 | if (scope.getBinding(localName) !== path.scope.getBinding(localName)) {
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60 | return;
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61 | }
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62 | if (path.parentPath.isExpressionStatement() && !path.isCompletionRecord()) {
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63 | const operator = path.node.operator == "++" ? "+=" : "-=";
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64 | path.replaceWith(assignmentExpression(operator, arg.node, numericLiteral(1)));
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65 | } else if (path.node.prefix) {
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66 | path.replaceWith(assignmentExpression("=", identifier(localName), binaryExpression(path.node.operator[0], unaryExpression("+", arg.node), numericLiteral(1))));
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67 | } else {
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68 | const old = path.scope.generateUidIdentifierBasedOnNode(arg.node, "old");
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69 | const varName = old.name;
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70 | path.scope.push({
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71 | id: old
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72 | });
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73 | const binary = binaryExpression(path.node.operator[0], identifier(varName), numericLiteral(1));
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74 | path.replaceWith(sequenceExpression([assignmentExpression("=", identifier(varName), unaryExpression("+", arg.node)), assignmentExpression("=", cloneNode(arg.node), binary), identifier(varName)]));
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75 | }
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76 | }
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77 | };
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78 | }
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79 | function simplifyAccess(path, bindingNames) {
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80 | {
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81 | var _arguments$;
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82 | path.traverse(simpleAssignmentVisitor, {
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83 | scope: path.scope,
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84 | bindingNames,
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85 | seen: new WeakSet(),
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86 | includeUpdateExpression: (_arguments$ = arguments[2]) != null ? _arguments$ : true
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87 | });
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88 | }
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89 | }
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90 |
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91 |
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