import * as frontend from 'llparse-frontend';

import { Node } from './base';

export class SpanStart extends Node<frontend.node.SpanStart> {

public doBuild(out: string[]): void {

// Prevent spurious empty spans

this.prologue(out);

const ctx = this.compilation;

const field = this.ref.field;

const posField = ctx.spanPosField(field.index);

out.push(`${posField} = (void*) ${ctx.posArg()};`);

if (field.callbacks.length > 1) {

const cbField = ctx.spanCbField(field.index);

const callback = ctx.unwrapCode(this.ref.callback);

out.push(`${cbField} = ${ctx.buildCode(callback)};`);

}

const otherwise = this.ref.otherwise!;

this.tailTo(out, otherwise);

}

}