Function getFunctionExpressionContext

packages/language/src/utils.ts:416–430

(funcDecl: FunctionDecl)

 * Returns an empty array if no such attribute is found or if the attribute value cannot be determined.
 */
export function getFunctionExpressionContext(funcDecl: FunctionDecl) {
    const funcAllowedContext: ExpressionContext[] = [];
    const funcAttr = funcDecl.attributes.find((attr) => attr.decl.$refText === '@@@expressionContext');
    if (funcAttr) {
        const contextArg = funcAttr.args[0]?.value;
        if (isArrayExpr(contextArg)) {
            contextArg.items.forEach((item) => {
                if (isEnumFieldReference(item)) {
                    funcAllowedContext.push(item.target.$refText as ExpressionContext);
                }
            });
        }
    }
    return funcAllowedContext;
}

/**
 * Gets the data field referenced by the given expression, if any. Returns `undefined` if the expression is not a reference to a data field.