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index.js
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Sat, Dec 14, 03:40

index.js
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'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
var helperPluginUtils = require('@babel/helper-plugin-utils');
var core = require('@babel/core');
function isPureVoid(node) {
return core.types.isUnaryExpression(node) && node.operator === "void" && core.types.isPureish(node.argument);
}
function unshiftForXStatementBody(statementPath, newStatements) {
statementPath.ensureBlock();
const {
scope,
node
} = statementPath;
const bodyScopeBindings = statementPath.get("body").scope.bindings;
const hasShadowedBlockScopedBindings = Object.keys(bodyScopeBindings).some(name => scope.hasBinding(name));
if (hasShadowedBlockScopedBindings) {
node.body = core.types.blockStatement([...newStatements, node.body]);
} else {
node.body.body.unshift(...newStatements);
}
}
function hasArrayRest(pattern) {
return pattern.elements.some(elem => core.types.isRestElement(elem));
}
function hasObjectRest(pattern) {
return pattern.properties.some(prop => core.types.isRestElement(prop));
}
const STOP_TRAVERSAL = {};
const arrayUnpackVisitor = (node, ancestors, state) => {
if (!ancestors.length) {
return;
}
if (core.types.isIdentifier(node) && core.types.isReferenced(node, ancestors[ancestors.length - 1].node) && state.bindings[node.name]) {
state.deopt = true;
throw STOP_TRAVERSAL;
}
};
class DestructuringTransformer {
constructor(opts) {
this.blockHoist = void 0;
this.operator = void 0;
this.arrayRefSet = void 0;
this.nodes = void 0;
this.scope = void 0;
this.kind = void 0;
this.iterableIsArray = void 0;
this.arrayLikeIsIterable = void 0;
this.objectRestNoSymbols = void 0;
this.useBuiltIns = void 0;
this.addHelper = void 0;
this.blockHoist = opts.blockHoist;
this.operator = opts.operator;
this.arrayRefSet = new Set();
this.nodes = opts.nodes || [];
this.scope = opts.scope;
this.kind = opts.kind;
this.iterableIsArray = opts.iterableIsArray;
this.arrayLikeIsIterable = opts.arrayLikeIsIterable;
this.objectRestNoSymbols = opts.objectRestNoSymbols;
this.useBuiltIns = opts.useBuiltIns;
this.addHelper = opts.addHelper;
}
getExtendsHelper() {
return this.useBuiltIns ? core.types.memberExpression(core.types.identifier("Object"), core.types.identifier("assign")) : this.addHelper("extends");
}
buildVariableAssignment(id, init) {
let op = this.operator;
if (core.types.isMemberExpression(id)) op = "=";
let node;
if (op) {
node = core.types.expressionStatement(core.types.assignmentExpression(op, id, core.types.cloneNode(init) || this.scope.buildUndefinedNode()));
} else {
let nodeInit;
if ((this.kind === "const" || this.kind === "using") && init === null) {
nodeInit = this.scope.buildUndefinedNode();
} else {
nodeInit = core.types.cloneNode(init);
}
node = core.types.variableDeclaration(this.kind, [core.types.variableDeclarator(id, nodeInit)]);
}
node._blockHoist = this.blockHoist;
return node;
}
buildVariableDeclaration(id, init) {
const declar = core.types.variableDeclaration("var", [core.types.variableDeclarator(core.types.cloneNode(id), core.types.cloneNode(init))]);
declar._blockHoist = this.blockHoist;
return declar;
}
push(id, _init) {
const init = core.types.cloneNode(_init);
if (core.types.isObjectPattern(id)) {
this.pushObjectPattern(id, init);
} else if (core.types.isArrayPattern(id)) {
this.pushArrayPattern(id, init);
} else if (core.types.isAssignmentPattern(id)) {
this.pushAssignmentPattern(id, init);
} else {
this.nodes.push(this.buildVariableAssignment(id, init));
}
}
toArray(node, count) {
if (this.iterableIsArray || core.types.isIdentifier(node) && this.arrayRefSet.has(node.name)) {
return node;
} else {
return this.scope.toArray(node, count, this.arrayLikeIsIterable);
}
}
pushAssignmentPattern({
left,
right
}, valueRef) {
if (isPureVoid(valueRef)) {
this.push(left, right);
return;
}
const tempId = this.scope.generateUidIdentifierBasedOnNode(valueRef);
this.nodes.push(this.buildVariableDeclaration(tempId, valueRef));
const tempConditional = core.types.conditionalExpression(core.types.binaryExpression("===", core.types.cloneNode(tempId), this.scope.buildUndefinedNode()), right, core.types.cloneNode(tempId));
if (core.types.isPattern(left)) {
let patternId;
let node;
if (this.kind === "const" || this.kind === "let" || this.kind === "using") {
patternId = this.scope.generateUidIdentifier(tempId.name);
node = this.buildVariableDeclaration(patternId, tempConditional);
} else {
patternId = tempId;
node = core.types.expressionStatement(core.types.assignmentExpression("=", core.types.cloneNode(tempId), tempConditional));
}
this.nodes.push(node);
this.push(left, patternId);
} else {
this.nodes.push(this.buildVariableAssignment(left, tempConditional));
}
}
pushObjectRest(pattern, objRef, spreadProp, spreadPropIndex) {
const value = buildObjectExcludingKeys(pattern.properties.slice(0, spreadPropIndex), objRef, this.scope, name => this.addHelper(name), this.objectRestNoSymbols, this.useBuiltIns);
this.nodes.push(this.buildVariableAssignment(spreadProp.argument, value));
}
pushObjectProperty(prop, propRef) {
if (core.types.isLiteral(prop.key)) prop.computed = true;
const pattern = prop.value;
const objRef = core.types.memberExpression(core.types.cloneNode(propRef), prop.key, prop.computed);
if (core.types.isPattern(pattern)) {
this.push(pattern, objRef);
} else {
this.nodes.push(this.buildVariableAssignment(pattern, objRef));
}
}
pushObjectPattern(pattern, objRef) {
if (!pattern.properties.length) {
this.nodes.push(core.types.expressionStatement(core.types.callExpression(this.addHelper("objectDestructuringEmpty"), isPureVoid(objRef) ? [] : [objRef])));
return;
}
if (pattern.properties.length > 1 && !this.scope.isStatic(objRef)) {
const temp = this.scope.generateUidIdentifierBasedOnNode(objRef);
this.nodes.push(this.buildVariableDeclaration(temp, objRef));
objRef = temp;
}
if (hasObjectRest(pattern)) {
let copiedPattern;
for (let i = 0; i < pattern.properties.length; i++) {
const prop = pattern.properties[i];
if (core.types.isRestElement(prop)) {
break;
}
const key = prop.key;
if (prop.computed && !this.scope.isPure(key)) {
const name = this.scope.generateUidIdentifierBasedOnNode(key);
this.nodes.push(
this.buildVariableDeclaration(name, key));
if (!copiedPattern) {
copiedPattern = pattern = Object.assign({}, pattern, {
properties: pattern.properties.slice()
});
}
copiedPattern.properties[i] = Object.assign({}, prop, {
key: name
});
}
}
}
for (let i = 0; i < pattern.properties.length; i++) {
const prop = pattern.properties[i];
if (core.types.isRestElement(prop)) {
this.pushObjectRest(pattern, objRef, prop, i);
} else {
this.pushObjectProperty(prop, objRef);
}
}
}
canUnpackArrayPattern(pattern, arr) {
if (!core.types.isArrayExpression(arr)) return false;
if (pattern.elements.length > arr.elements.length) return;
if (pattern.elements.length < arr.elements.length && !hasArrayRest(pattern)) {
return false;
}
for (const elem of pattern.elements) {
if (!elem) return false;
if (core.types.isMemberExpression(elem)) return false;
}
for (const elem of arr.elements) {
if (core.types.isSpreadElement(elem)) return false;
if (core.types.isCallExpression(elem)) return false;
if (core.types.isMemberExpression(elem)) return false;
}
const bindings = core.types.getBindingIdentifiers(pattern);
const state = {
deopt: false,
bindings
};
try {
core.types.traverse(arr, arrayUnpackVisitor, state);
} catch (e) {
if (e !== STOP_TRAVERSAL) throw e;
}
return !state.deopt;
}
pushUnpackedArrayPattern(pattern, arr) {
const holeToUndefined = el => el != null ? el : this.scope.buildUndefinedNode();
for (let i = 0; i < pattern.elements.length; i++) {
const elem = pattern.elements[i];
if (core.types.isRestElement(elem)) {
this.push(elem.argument, core.types.arrayExpression(arr.elements.slice(i).map(holeToUndefined)));
} else {
this.push(elem, holeToUndefined(arr.elements[i]));
}
}
}
pushArrayPattern(pattern, arrayRef) {
if (arrayRef === null) {
this.nodes.push(core.types.expressionStatement(core.types.callExpression(this.addHelper("objectDestructuringEmpty"), [])));
return;
}
if (!pattern.elements) return;
if (this.canUnpackArrayPattern(pattern, arrayRef)) {
return this.pushUnpackedArrayPattern(pattern, arrayRef);
}
const count = !hasArrayRest(pattern) && pattern.elements.length;
const toArray = this.toArray(arrayRef, count);
if (core.types.isIdentifier(toArray)) {
arrayRef = toArray;
} else {
arrayRef = this.scope.generateUidIdentifierBasedOnNode(arrayRef);
this.arrayRefSet.add(arrayRef.name);
this.nodes.push(this.buildVariableDeclaration(arrayRef, toArray));
}
for (let i = 0; i < pattern.elements.length; i++) {
const elem = pattern.elements[i];
if (!elem) continue;
let elemRef;
if (core.types.isRestElement(elem)) {
elemRef = this.toArray(arrayRef);
elemRef = core.types.callExpression(core.types.memberExpression(elemRef, core.types.identifier("slice")), [core.types.numericLiteral(i)]);
this.push(elem.argument, elemRef);
} else {
elemRef = core.types.memberExpression(arrayRef, core.types.numericLiteral(i), true);
this.push(elem, elemRef);
}
}
}
init(pattern, ref) {
if (!core.types.isArrayExpression(ref) && !core.types.isMemberExpression(ref)) {
const memo = this.scope.maybeGenerateMemoised(ref, true);
if (memo) {
this.nodes.push(this.buildVariableDeclaration(memo, core.types.cloneNode(ref)));
ref = memo;
}
}
this.push(pattern, ref);
return this.nodes;
}
}
function buildObjectExcludingKeys(excludedKeys, objRef, scope, addHelper, objectRestNoSymbols, useBuiltIns) {
const keys = [];
let allLiteral = true;
let hasTemplateLiteral = false;
for (let i = 0; i < excludedKeys.length; i++) {
const prop = excludedKeys[i];
const key = prop.key;
if (core.types.isIdentifier(key) && !prop.computed) {
keys.push(core.types.stringLiteral(key.name));
} else if (core.types.isTemplateLiteral(key)) {
keys.push(core.types.cloneNode(key));
hasTemplateLiteral = true;
} else if (core.types.isLiteral(key)) {
keys.push(core.types.stringLiteral(String(key.value)));
} else if (core.types.isPrivateName(key)) ; else {
keys.push(core.types.cloneNode(key));
allLiteral = false;
}
}
let value;
if (keys.length === 0) {
const extendsHelper = useBuiltIns ? core.types.memberExpression(core.types.identifier("Object"), core.types.identifier("assign")) : addHelper("extends");
value = core.types.callExpression(extendsHelper, [core.types.objectExpression([]), core.types.sequenceExpression([core.types.callExpression(addHelper("objectDestructuringEmpty"), [core.types.cloneNode(objRef)]), core.types.cloneNode(objRef)])]);
} else {
let keyExpression = core.types.arrayExpression(keys);
if (!allLiteral) {
keyExpression = core.types.callExpression(core.types.memberExpression(keyExpression, core.types.identifier("map")), [addHelper("toPropertyKey")]);
} else if (!hasTemplateLiteral && !core.types.isProgram(scope.block)) {
const programScope = scope.getProgramParent();
const id = programScope.generateUidIdentifier("excluded");
programScope.push({
id,
init: keyExpression,
kind: "const"
});
keyExpression = core.types.cloneNode(id);
}
value = core.types.callExpression(addHelper(`objectWithoutProperties${objectRestNoSymbols ? "Loose" : ""}`), [core.types.cloneNode(objRef), keyExpression]);
}
return value;
}
function convertVariableDeclaration(path, addHelper, arrayLikeIsIterable, iterableIsArray, objectRestNoSymbols, useBuiltIns) {
const {
node,
scope
} = path;
const nodeKind = node.kind;
const nodeLoc = node.loc;
const nodes = [];
for (let i = 0; i < node.declarations.length; i++) {
const declar = node.declarations[i];
const patternId = declar.init;
const pattern = declar.id;
const destructuring = new DestructuringTransformer({
blockHoist: node._blockHoist,
nodes: nodes,
scope: scope,
kind: node.kind,
iterableIsArray,
arrayLikeIsIterable,
useBuiltIns,
objectRestNoSymbols,
addHelper
});
if (core.types.isPattern(pattern)) {
destructuring.init(pattern, patternId);
if (+i !== node.declarations.length - 1) {
core.types.inherits(nodes[nodes.length - 1], declar);
}
} else {
nodes.push(core.types.inherits(destructuring.buildVariableAssignment(pattern, patternId), declar));
}
}
let tail = null;
let nodesOut = [];
for (const node of nodes) {
if (core.types.isVariableDeclaration(node)) {
if (tail !== null) {
tail.declarations.push(...node.declarations);
continue;
} else {
node.kind = nodeKind;
tail = node;
}
} else {
tail = null;
}
if (!node.loc) {
node.loc = nodeLoc;
}
nodesOut.push(node);
}
if (nodesOut.length === 2 && core.types.isVariableDeclaration(nodesOut[0]) && core.types.isExpressionStatement(nodesOut[1]) && core.types.isCallExpression(nodesOut[1].expression) && nodesOut[0].declarations.length === 1) {
const expr = nodesOut[1].expression;
expr.arguments = [nodesOut[0].declarations[0].init];
nodesOut = [expr];
} else {
if (core.types.isForStatement(path.parent, {
init: node
}) && !nodesOut.some(v => core.types.isVariableDeclaration(v))) {
for (let i = 0; i < nodesOut.length; i++) {
const node = nodesOut[i];
if (core.types.isExpressionStatement(node)) {
nodesOut[i] = node.expression;
}
}
}
}
if (nodesOut.length === 1) {
path.replaceWith(nodesOut[0]);
} else {
path.replaceWithMultiple(nodesOut);
}
scope.crawl();
}
function convertAssignmentExpression(path, addHelper, arrayLikeIsIterable, iterableIsArray, objectRestNoSymbols, useBuiltIns) {
const {
node,
scope,
parentPath
} = path;
const nodes = [];
const destructuring = new DestructuringTransformer({
operator: node.operator,
scope: scope,
nodes: nodes,
arrayLikeIsIterable,
iterableIsArray,
objectRestNoSymbols,
useBuiltIns,
addHelper
});
let ref;
if (!parentPath.isExpressionStatement() && !parentPath.isSequenceExpression() || path.isCompletionRecord()) {
ref = scope.generateUidIdentifierBasedOnNode(node.right, "ref");
nodes.push(core.types.variableDeclaration("var", [core.types.variableDeclarator(ref, node.right)]));
if (core.types.isArrayExpression(node.right)) {
destructuring.arrayRefSet.add(ref.name);
}
}
destructuring.init(node.left, ref || node.right);
if (ref) {
if (parentPath.isArrowFunctionExpression()) {
path.replaceWith(core.types.blockStatement([]));
nodes.push(core.types.returnStatement(core.types.cloneNode(ref)));
} else {
nodes.push(core.types.expressionStatement(core.types.cloneNode(ref)));
}
}
path.replaceWithMultiple(nodes);
scope.crawl();
}
function variableDeclarationHasPattern(node) {
for (const declar of node.declarations) {
if (core.types.isPattern(declar.id)) {
return true;
}
}
return false;
}
var index = helperPluginUtils.declare((api, options) => {
var _ref, _api$assumption, _ref2, _options$allowArrayLi, _ref3, _api$assumption2;
api.assertVersion(7);
const {
useBuiltIns = false
} = options;
const iterableIsArray = (_ref = (_api$assumption = api.assumption("iterableIsArray")) != null ? _api$assumption : options.loose) != null ? _ref : false;
const arrayLikeIsIterable = (_ref2 = (_options$allowArrayLi = options.allowArrayLike) != null ? _options$allowArrayLi : api.assumption("arrayLikeIsIterable")) != null ? _ref2 : false;
const objectRestNoSymbols = (_ref3 = (_api$assumption2 = api.assumption("objectRestNoSymbols")) != null ? _api$assumption2 : options.loose) != null ? _ref3 : false;
return {
name: "transform-destructuring",
visitor: {
ExportNamedDeclaration(path) {
const declaration = path.get("declaration");
if (!declaration.isVariableDeclaration()) return;
if (!variableDeclarationHasPattern(declaration.node)) return;
const specifiers = [];
for (const name of Object.keys(path.getOuterBindingIdentifiers())) {
specifiers.push(core.types.exportSpecifier(core.types.identifier(name), core.types.identifier(name)));
}
path.replaceWith(declaration.node);
path.insertAfter(core.types.exportNamedDeclaration(null, specifiers));
path.scope.crawl();
},
ForXStatement(path) {
const {
node,
scope
} = path;
const left = node.left;
if (core.types.isPattern(left)) {
const temp = scope.generateUidIdentifier("ref");
node.left = core.types.variableDeclaration("var", [core.types.variableDeclarator(temp)]);
path.ensureBlock();
const statementBody = path.node.body.body;
const nodes = [];
if (statementBody.length === 0 && path.isCompletionRecord()) {
nodes.unshift(core.types.expressionStatement(scope.buildUndefinedNode()));
}
nodes.unshift(core.types.expressionStatement(core.types.assignmentExpression("=", left, core.types.cloneNode(temp))));
unshiftForXStatementBody(path, nodes);
scope.crawl();
return;
}
if (!core.types.isVariableDeclaration(left)) return;
const pattern = left.declarations[0].id;
if (!core.types.isPattern(pattern)) return;
const key = scope.generateUidIdentifier("ref");
node.left = core.types.variableDeclaration(left.kind, [core.types.variableDeclarator(key, null)]);
const nodes = [];
const destructuring = new DestructuringTransformer({
kind: left.kind,
scope: scope,
nodes: nodes,
arrayLikeIsIterable,
iterableIsArray,
objectRestNoSymbols,
useBuiltIns,
addHelper: name => this.addHelper(name)
});
destructuring.init(pattern, key);
unshiftForXStatementBody(path, nodes);
scope.crawl();
},
CatchClause({
node,
scope
}) {
const pattern = node.param;
if (!core.types.isPattern(pattern)) return;
const ref = scope.generateUidIdentifier("ref");
node.param = ref;
const nodes = [];
const destructuring = new DestructuringTransformer({
kind: "let",
scope: scope,
nodes: nodes,
arrayLikeIsIterable,
iterableIsArray,
objectRestNoSymbols,
useBuiltIns,
addHelper: name => this.addHelper(name)
});
destructuring.init(pattern, ref);
node.body.body = [...nodes, ...node.body.body];
scope.crawl();
},
AssignmentExpression(path, state) {
if (!core.types.isPattern(path.node.left)) return;
convertAssignmentExpression(path, name => state.addHelper(name), arrayLikeIsIterable, iterableIsArray, objectRestNoSymbols, useBuiltIns);
},
VariableDeclaration(path, state) {
const {
node,
parent
} = path;
if (core.types.isForXStatement(parent)) return;
if (!parent || !path.container) return;
if (!variableDeclarationHasPattern(node)) return;
convertVariableDeclaration(path, name => state.addHelper(name), arrayLikeIsIterable, iterableIsArray, objectRestNoSymbols, useBuiltIns);
}
}
};
});
exports.buildObjectExcludingKeys = buildObjectExcludingKeys;
exports["default"] = index;
exports.unshiftForXStatementBody = unshiftForXStatementBody;
//# sourceMappingURL=index.js.map

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