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import {seq, tok, altPrio, regex as reg, Expression, starPrio} from "../combi";
import {Plus} from "../../1_lexer/tokens";
import {SourceFieldSymbol, ArrowOrDash, ComponentName, SourceField} from ".";
import {IStatementRunnable} from "../statement_runnable";
 
export class FieldOffset extends Expression {
  public getRunnable(): IStatementRunnable {
    const named = seq(altPrio(SourceField, SourceFieldSymbol),
                      starPrio(seq(ArrowOrDash, ComponentName)));
 
    const offset = seq(tok(Plus),
                       altPrio(reg(/^\d+$/), named));
 
    return offset;
  }
}