Method setDefaultArguments

output/java8/1.4.17/Interpreter.java:1238–1273

Set any default argument values that were not set by the invoking template or by ST#add directly. Note that the default values may be templates. The evaluation context is the invokedST template itself so template default arguments can see other arguments.

(STWriter out, InstanceScope scope)

     */

    public void setDefaultArguments(STWriter out, InstanceScope scope) {
        final ST invokedST = scope.st;
        if ( invokedST.impl.formalArguments==null || invokedST.impl.numberOfArgsWithDefaultValues==0) {
            return;
        }
        for (FormalArgument arg : invokedST.impl.formalArguments.values()) {
            // if no value for attribute and default arg, inject default arg into self
            if ( invokedST.locals[arg.index] != ST.EMPTY_ATTR || arg.defaultValueToken==null ) {
                continue;
            }
            //System.out.println("setting def arg "+arg.name+" to "+arg.defaultValueToken);
            if ( arg.defaultValueToken.getType()==GroupParser.ANONYMOUS_TEMPLATE ) {
                CompiledST code = arg.compiledDefaultValue;
                if ( code==null ) {
                    code = new CompiledST();
                }
                ST defaultArgST = group.createStringTemplateInternally(code);
                defaultArgST.groupThatCreatedThisInstance = group;
                // If default arg is template with single expression
                // wrapped in parens, x={<(...)>}, then eval to string
                // rather than setting x to the template for later
                // eval.
                String defArgTemplate = arg.defaultValueToken.getText();
                if ( defArgTemplate.startsWith("{"+group.delimiterStartChar+"(") && defArgTemplate.endsWith(")"+group.delimiterStopChar+"}") ) {
                    invokedST.rawSetAttribute(arg.name,
                                              toString(out, new InstanceScope(scope, invokedST), defaultArgST));
                }
                else {
                    invokedST.rawSetAttribute(arg.name, defaultArgST);
                }
            }
            else {
                invokedST.rawSetAttribute(arg.name, arg.defaultValue);
            }
        }
    }

    /**
     * If an instance of <i>x</i> is enclosed in a <i>y</i> which is in a