85 lines
2.3 KiB
JavaScript
85 lines
2.3 KiB
JavaScript
import type { Scope } from "@babel/traverse";
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import * as t from "@babel/types";
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function getObjRef(node, nodes, file, scope) {
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let ref;
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if (t.isSuper(node)) {
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// Super cannot be directly assigned so lets return it directly
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return node;
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} else if (t.isIdentifier(node)) {
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if (scope.hasBinding(node.name)) {
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// this variable is declared in scope so we can be 100% sure
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// that evaluating it multiple times wont trigger a getter
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// or something else
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return node;
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} else {
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// could possibly trigger a getter so we need to only evaluate
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// it once
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ref = node;
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}
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} else if (t.isMemberExpression(node)) {
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ref = node.object;
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if (t.isSuper(ref) || (t.isIdentifier(ref) && scope.hasBinding(ref.name))) {
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// the object reference that we need to save is locally declared
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// so as per the previous comment we can be 100% sure evaluating
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// it multiple times will be safe
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// Super cannot be directly assigned so lets return it also
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return ref;
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}
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} else {
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throw new Error(`We can't explode this node type ${node.type}`);
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}
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const temp = scope.generateUidIdentifierBasedOnNode(ref);
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scope.push({ id: temp });
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nodes.push(t.assignmentExpression("=", t.cloneNode(temp), t.cloneNode(ref)));
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return temp;
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}
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function getPropRef(node, nodes, file, scope) {
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const prop = node.property;
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const key = t.toComputedKey(node, prop);
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if (t.isLiteral(key) && t.isPureish(key)) return key;
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const temp = scope.generateUidIdentifierBasedOnNode(prop);
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scope.push({ id: temp });
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nodes.push(t.assignmentExpression("=", t.cloneNode(temp), t.cloneNode(prop)));
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return temp;
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}
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export default function(
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node: Object,
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nodes: Array<Object>,
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file,
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scope: Scope,
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allowedSingleIdent?: boolean,
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): {
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uid: Object,
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ref: Object,
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} {
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let obj;
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if (t.isIdentifier(node) && allowedSingleIdent) {
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obj = node;
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} else {
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obj = getObjRef(node, nodes, file, scope);
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}
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let ref, uid;
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if (t.isIdentifier(node)) {
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ref = t.cloneNode(node);
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uid = obj;
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} else {
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const prop = getPropRef(node, nodes, file, scope);
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const computed = node.computed || t.isLiteral(prop);
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uid = t.memberExpression(t.cloneNode(obj), t.cloneNode(prop), computed);
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ref = t.memberExpression(t.cloneNode(obj), t.cloneNode(prop), computed);
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}
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return {
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uid: uid,
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ref: ref,
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};
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}
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