statements sort.ts

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1x import {IStatement} from "./_statement";
import {seq, alt, per, altPrio, opt, plus, optPrio} from "../combi";
import {Target, Dynamic, ComponentChain, SourceFieldSymbol} from "../expressions";
import {IStatementRunnable} from "../statement_runnable";
 
export class Sort implements IStatement {
 
  public getMatcher(): IStatementRunnable {
    const order = altPrio("ASCENDING", "DESCENDING");
 
    const sel = alt(ComponentChain, Dynamic, SourceFieldSymbol);
 
    const text = "AS TEXT";
 
    const fields = plus(seq(sel, optPrio(text), optPrio(order), optPrio(text)));
 
    const by = seq("BY", fields);
 
    const normal = seq(Target, opt(per(order, by, "STABLE", text)));
 
    return seq("SORT", normal);
  }
 
}