All files / src/ast/control-flow elvis.ts

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import type { ExpressionState } from '../../expression-state.js';
import { TypedValue } from '../../typed-value.js';
import { SpelNodeImpl } from '../spel-node.js';
import { NodeType } from '../../language/node-type.js';
 
export class Elvis extends SpelNodeImpl {
  constructor(startPos: number, endPos: number, left: SpelNodeImpl, right: SpelNodeImpl) {
    super(NodeType.ELVIS, startPos, endPos, left, right);
  }
 
  public getValueInternal(state: ExpressionState): TypedValue {
    const leftVal = this.children[0]!.getValue(state);
    const raw = leftVal.getValue();
    if (raw !== null && raw !== undefined) {
      return leftVal;
    }
    return this.children[1]!.getValue(state);
  }
 
  public toStringAST(): string {
    return `(${this.children[0]!.toStringAST()} ?: ${this.children[1]!.toStringAST()})`;
  }
}