Method exec

output/java8/1.4.13/Interpreter.java:154–169

Execute template self and return how many characters it wrote to out. @return the number of characters written to out

(STWriter out, InstanceScope scope)

     */

    public int exec(STWriter out, InstanceScope scope) {
        final ST self = scope.st;
        if ( trace ) System.out.println("exec("+self.getName()+")");
        try {
            setDefaultArguments(out, scope);
            return _exec(out, scope);
        }
        catch (Exception e) {
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            e.printStackTrace(pw);
            pw.flush();
            errMgr.runTimeError(this, scope, ErrorType.INTERNAL_ERROR, "internal error: "+sw.toString());
            return 0;
        }
    }

    protected int _exec(STWriter out, InstanceScope scope) {
        final ST self = scope.st;