Method passthru

output/java8/1.4.17/Interpreter.java:498–531

(InstanceScope scope, String templateName, Map<String, Object> attrs)

    }

    void passthru(InstanceScope scope, String templateName, Map<String, Object> attrs) {
        CompiledST c = group.lookupTemplate(templateName);
        if ( c==null ) return; // will get error later
        if ( c.formalArguments==null ) return;
        for (FormalArgument arg : c.formalArguments.values()) {
            // if not already set by user, set to value from outer scope
            if ( !attrs.containsKey(arg.name) ) {
                //System.out.println("arg "+arg.name+" missing");
                try {
                    Object o = getAttribute(scope, arg.name);
                    // If the attribute exists but there is no value and
                    // the formal argument has no default value, make it null.
                    if ( o==ST.EMPTY_ATTR && arg.defaultValueToken==null ) {
                        attrs.put(arg.name, null);
                    }
                    // Else, the attribute has an existing value, set arg.
                    else if ( o!= ST.EMPTY_ATTR ) {
                             attrs.put(arg.name, o);
                    }
                }
                catch (STNoSuchAttributeException nsae) {
                    // if no such attribute exists for arg.name, set parameter
                    // if no default value
                    if ( arg.defaultValueToken==null ) {
                        errMgr.runTimeError(this,
                                            scope,
                                            ErrorType.NO_SUCH_ATTRIBUTE_PASS_THROUGH,
                                            arg.name);
                        attrs.put(arg.name, null);
                    }
                }
            }
        }
    }

    void storeArgs(InstanceScope scope, Map<String, Object> attrs, ST st) {
        boolean noSuchAttributeReported = false;