45 lines
1.7 KiB
JavaScript
45 lines
1.7 KiB
JavaScript
import BaseJSNode from './BaseJSNode.js';
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export default class UnaryExpression extends BaseJSNode {
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run() {
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const operator = this.node.operator;
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switch (operator) {
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case '-': {
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const arg = this.visitor.visitNode(this.node.argument);
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return -arg;
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}
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case '+': {
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const arg = this.visitor.visitNode(this.node.argument);
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return +arg;
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}
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case '!': {
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const arg = this.visitor.visitNode(this.node.argument);
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return !arg;
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}
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case '~': {
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const arg = this.visitor.visitNode(this.node.argument);
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return ~arg;
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}
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case 'void': {
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this.visitor.visitNode(this.node.argument);
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return undefined;
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}
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case 'typeof': {
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const arg = this.visitor.visitNode(this.node.argument);
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return typeof arg;
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}
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case 'delete': {
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if (this.node.argument.type === 'MemberExpression') {
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const obj = this.visitor.visitNode(this.node.argument.object);
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const prop = this.node.argument.computed ? this.visitor.visitNode(this.node.argument.property) : this.visitor.getName(this.node.argument.property);
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return delete obj[prop];
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}
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else if (this.node.argument.type === 'Identifier') {
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return this.visitor.scope.delete(this.node.argument.name);
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}
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return true;
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}
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default:
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console.warn('Unhandled UnaryExpression operator', operator);
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}
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}
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}
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