All files / src/ast/operator op-dec.ts

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100% Functions 2/2
96.66% Lines 29/30

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import type { ExpressionState } from '../../expression-state.js';
import { TypedValue } from '../../typed-value.js';
import { SpelEvaluationException } from '../../error/spel-evaluation-exception.js';
import { SpelMessage } from '../../error/spel-message.js';
import { Operator } from '../spel-node.js';
import { NodeType } from '../../language/node-type.js';
 
export class OpDec extends Operator {
  constructor(
    operatorName: string,
    startPos: number,
    endPos: number,
    ...operands: import('../spel-node.js').SpelNodeImpl[]
  ) {
    super(NodeType.OP_DEC, operatorName, startPos, endPos, ...operands);
  }
 
  public override getValueInternal(state: ExpressionState): TypedValue {
    const child = this.children[0]!;
    const current = child.getValue(state).getValue() as number;
    const newValue = current - 1;
 
    try {
      child.setValue(state, newValue);
    } catch {
      throw new SpelEvaluationException(
        this.startPos,
        SpelMessage.OPERAND_NOT_DECREMENTABLE,
        child.toStringAST(),
      );
    }
 
    return new TypedValue(newValue);
  }
}