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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import {CDSAggregate, CDSArithParen, CDSArithmetics, CDSCast, CDSCondition, CDSFunction, CDSInteger, CDSPrefixedName, CDSString} from ".";
import {altPrio, Expression, optPrio, plusPrio, seq} from "../../abap/2_statements/combi";
import {IStatementRunnable} from "../../abap/2_statements/statement_runnable";
export class CDSCase extends Expression {
public getRunnable(): IStatementRunnable {
// caseParen: explicit "( case ... end )" alternative placed BEFORE CDSArithmetics.
// This avoids CDSArithmetics trying ( case ... end ) as an operand (partial match + fail),
// which causes 2^N backtracking for N levels of nested parenthesized CASE expressions.
// CDSArithmetics is still tried after for arithmetic like (-1)*Amount or (2*A)-B.
const caseParen = seq("(", CDSCase, ")");
const value = altPrio(CDSString, CDSCase, caseParen, CDSArithmetics, CDSCast,
CDSAggregate, CDSArithParen, CDSFunction, CDSInteger, CDSPrefixedName);
const simple = seq(altPrio(CDSArithmetics, CDSArithParen, CDSAggregate, CDSFunction, CDSPrefixedName), plusPrio(seq("WHEN", value, "THEN", value)));
const complex = plusPrio(seq("WHEN", CDSCondition, "THEN", value));
return seq("CASE", altPrio(complex, simple), optPrio(seq("ELSE", value)), "END");
}
} |