You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
3.3 KiB
79 lines
3.3 KiB
4 years ago
|
"use strict";
|
||
|
|
|
||
|
|
Object.defineProperty(exports, "__esModule", {
|
||
|
|
value: true
|
||
|
|
});
|
||
|
|
exports.default = simplifyAccess;
|
||
|
|
|
||
|
|
var t = _interopRequireWildcard(require("@babel/types"));
|
||
|
|
|
||
|
|
function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
|
||
|
|
|
||
|
|
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
|
||
|
|
|
||
|
|
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(t.assignmentExpression(operator, arg.node, t.numericLiteral(1)));
|
||
|
|
} else if (path.node.prefix) {
|
||
|
|
path.replaceWith(t.assignmentExpression("=", t.identifier(localName), t.binaryExpression(path.node.operator[0], t.unaryExpression("+", arg.node), t.numericLiteral(1))));
|
||
|
|
} else {
|
||
|
|
const old = path.scope.generateUidIdentifierBasedOnNode(arg.node, "old");
|
||
|
|
const varName = old.name;
|
||
|
|
path.scope.push({
|
||
|
|
id: old
|
||
|
|
});
|
||
|
|
const binary = t.binaryExpression(path.node.operator[0], t.identifier(varName), t.numericLiteral(1));
|
||
|
|
path.replaceWith(t.sequenceExpression([t.assignmentExpression("=", t.identifier(varName), t.unaryExpression("+", arg.node)), t.assignmentExpression("=", t.cloneNode(arg.node), binary), t.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;
|
||
|
|
}
|
||
|
|
|
||
|
|
path.node.right = t.binaryExpression(path.node.operator.slice(0, -1), t.cloneNode(path.node.left), path.node.right);
|
||
|
|
path.node.operator = "=";
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
};
|