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- "use strict";
- var util = _interopRequireWildcard(require("./util"));
- function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
- var hasOwn = Object.prototype.hasOwnProperty;
- exports.hoist = function (funPath) {
- var t = util.getTypes();
- t.assertFunction(funPath.node);
- var vars = {};
- function varDeclToExpr(vdec, includeIdentifiers) {
- t.assertVariableDeclaration(vdec);
- var exprs = [];
- vdec.declarations.forEach(function (dec) {
-
-
- vars[dec.id.name] = t.identifier(dec.id.name);
- if (dec.init) {
- exprs.push(t.assignmentExpression("=", dec.id, dec.init));
- } else if (includeIdentifiers) {
- exprs.push(dec.id);
- }
- });
- if (exprs.length === 0) return null;
- if (exprs.length === 1) return exprs[0];
- return t.sequenceExpression(exprs);
- }
- funPath.get("body").traverse({
- VariableDeclaration: {
- exit: function exit(path) {
- var expr = varDeclToExpr(path.node, false);
- if (expr === null) {
- path.remove();
- } else {
-
-
- util.replaceWithOrRemove(path, t.expressionStatement(expr));
- }
-
- path.skip();
- }
- },
- ForStatement: function ForStatement(path) {
- var init = path.node.init;
- if (t.isVariableDeclaration(init)) {
- util.replaceWithOrRemove(path.get("init"), varDeclToExpr(init, false));
- }
- },
- ForXStatement: function ForXStatement(path) {
- var left = path.get("left");
- if (left.isVariableDeclaration()) {
- util.replaceWithOrRemove(left, varDeclToExpr(left.node, true));
- }
- },
- FunctionDeclaration: function FunctionDeclaration(path) {
- var node = path.node;
- vars[node.id.name] = node.id;
- var assignment = t.expressionStatement(t.assignmentExpression("=", t.clone(node.id), t.functionExpression(path.scope.generateUidIdentifierBasedOnNode(node), node.params, node.body, node.generator, node.expression)));
- if (path.parentPath.isBlockStatement()) {
-
-
- path.parentPath.unshiftContainer("body", assignment);
-
- path.remove();
- } else {
-
-
-
- util.replaceWithOrRemove(path, assignment);
- }
- path.skip();
- },
- FunctionExpression: function FunctionExpression(path) {
-
- path.skip();
- },
- ArrowFunctionExpression: function ArrowFunctionExpression(path) {
-
- path.skip();
- }
- });
- var paramNames = {};
- funPath.get("params").forEach(function (paramPath) {
- var param = paramPath.node;
- if (t.isIdentifier(param)) {
- paramNames[param.name] = param;
- } else {
-
- }
- });
- var declarations = [];
- Object.keys(vars).forEach(function (name) {
- if (!hasOwn.call(paramNames, name)) {
- declarations.push(t.variableDeclarator(vars[name], null));
- }
- });
- if (declarations.length === 0) {
- return null;
- }
- return t.variableDeclaration("var", declarations);
- };
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