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import {seq, tok, Expression, plus, ver, optPrio, alt} from "../combi";
import {WParenLeftW, WParenRightW} from "../../1_lexer/tokens";
import {ComponentName, Source, Field} from ".";
import {Version} from "../../../version";
import {IStatementRunnable} from "../statement_runnable";
import {ComponentChain} from "./component_chain";
 
export class CorrespondingBody extends Expression {
  public getRunnable(): IStatementRunnable {
    const mapping = seq("MAPPING", plus(seq(ComponentName, "=", ComponentChain)));
 
    const baseParen = seq("BASE", tok(WParenLeftW), Source, tok(WParenRightW));
 
    const discarding = ver(Version.v751, "DISCARDING DUPLICATES");
 
    return seq(
      optPrio("DEEP"),
      optPrio(baseParen),
      Source,
      optPrio(discarding),
      optPrio(mapping),
      optPrio(seq("EXCEPT", alt(plus(Field), "*"))),
    );
  }
}