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