@neo-one/smart-contract-compiler/dist/esm/compile/helper/storage/HandleUndefinedStorageHelper.js

NEO•ONE TypeScript smart contract compiler.

import { Helper } from '../Helper';
export class HandleUndefinedStorageHelper extends Helper {
    constructor({ handleUndefined, handleDefined }) {
        super();
        this.handleUndefined = handleUndefined;
        this.handleDefined = handleDefined;
    }
    emit(sb, node, optionsIn) {
        const options = sb.pushValueOptions(optionsIn);
        sb.emitHelper(node, options, sb.helpers.if({
            condition: () => {
                sb.emitOp(node, 'DUP');
                sb.emitPushBuffer(node, Buffer.alloc(0, 0));
                sb.emitOp(node, 'EQUAL');
            },
            whenTrue: () => {
                sb.emitOp(node, 'DROP');
                this.handleUndefined();
            },
            whenFalse: () => {
                this.handleDefined();
            },
        }));
    }
}

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