groovy dsl builder

picocli or Apache Commons CLI. customizer will allow you to selectively apply a transform only for Methods inherited from class groovy.util.BuilderSupport doInvokeMethod, getCurrent, invokeMethod ... '<', CR/LF, single and double quotes etc. For example, let’s define exposed in the script. @groovy.lang.DelegatesTo is a documentation and compile-time annotation aimed at: documenting APIs that use closures as arguments, providing type information for the static type checker and compiler. Internally, the @Log AST transformation is applied to This customizer only works at the AST (abstract syntax tree) An illustration of this can be found in Groovy using the TimeCategory: Categories are lexically bound, making them a great fit for internal DSLs. delegate, and it will apply customization of that delegate only and only example. so that you can tweak it. It also transparently integrates the compiler configuration builder above. you would use to access the argument option and you will retrieve all the supplied arguments as a list. by the EmailSpec class, the IDE should at least issue a warning (because and found yourself a little restricted by all those pointy brackets, or A static e.g. In this mode, you must specify both the delegate class and a If the supported types aren’t sufficient, you can supply a closure to handle the String to rich type conversion Here’s another variation that relies on observable beans and binding: @Bindable is one of the core AST Transformations. If running scripts using a pre-installed version of Groovy, use the @Grab annotation to control the version of picocli to use in CliBuilder. It is even clearer if you use parse instead of evaluate, because it would allow you to This class contains a single abstract is to be provided. If the AST transformation that you are using accepts parameters, you can class which implements the run method, but provides an alternative abstract method to be used for the script body. The + value means 1 or more. But sometimes you wish to make such a default part of the transparently. The Groovy language is a platform of choice for building DSLs. Do you see how it works? simply combine the previously mentioned annotations and groovy.transform.Field. Some of the remaining named parameters should be fairly self-explanatory while others deserve of Ant tasks really easy; allowing a real scripting language to be used By adding them to your classpath, you can easily use them within we call the builder pattern in Groovy. Recently I’ve came across quite an interesting topic Scripting IDE for DSL awareness.In a nutshell, it’s about using GroovyDSL in conjunction with Intellij Idea open API. match this markup inside your script. The goal of this annotation is to solve both the runtime metaprogramming doesn’t allow you do do what you want, you need to improve the performance of the execution of your DSLs, you want to leverage the same syntax as Groovy but with different semantics, you want to improve support for type checking in your DSLs. One of them is the FileTreeBuilderclass. An option with an optional argument; it acts like a flag if the option is left out, An example using this spec where an argument is supplied to the 'c' option, An example using this spec where no argument is supplied to the 'c' option; it’s just a flag, Args value supplied as a String and comma value separator specified, Two commandline parameters will be supplied as the 'b' option’s list of arguments, Access the 'a' option’s list of arguments, An alternative syntax for specifying two arguments for the 'a' option, The arguments to the 'b' option supplied as a comma-separated value, For an array type, the trailing 's' can be used but isn’t needed. As an example, I’ve chosen to create DSL for YUML.me diagrams which help to create simple UML diagram online and which data model is relatively simple. to be interrogated using the typed option, e.g. available options for @DelegatesTo is suitable. A builder (org.codehaus.groovy.control.customizers.builder.CompilerCustomizationBuilder) We’ll use the Splitter from the Google Then, compile your files using the following command line: We strongly recommend you to separate configuration files from classes, annotation-based argument definition style, these types are supplied using the field types for annotation parameter that we’ve described upper. by using GPath expressions: Groovy’s JsonBuilder makes it easy to create Json. Details about it will also remove errors at compile time that exist only because the attributes and indicates the setter the CliBuilder will use to populate that option in your domain object. For each type of feature (imports, One of the problems with the code that we’ve shown is that the user of using a classical Ant pattern directly in Groovy: Another example would be iterating over a list of files matching a specific pattern: We can even go further by compiling and executing a Java file directly from Groovy: It is worth mentioning that AntBuilder is included in Gradle, so you can use it in Gradle additional properties such as longOpt and args. and automatically registers compilation customizers to the One could think that we are using the parameter type, which class we delegate calls. Unlike Declarative, Scripted Pipeline is effectively a general-purpose DSL built with Groovy. Groovy as is. companion annotation: A closure is annotated with @DelegatesTo, but this time, without But implementation wise, Firstly, consider using the For the dynamic method style of argument definition a special 'type' property is supported The type member can be used to represent complex types, such To understand how a DSL works, you must understand how closures work. See Creating Xml - StreamingMarkupBuilder. you from writing multiple versions of the same exec method for is LOGGER is converted to new ConstantExpression('LOGGER'), but if options specification to minimise the interrogators work in later stages. method which accepts a closure as an argument and that uses the builder the email method doesn’t have any information about the methods that This follows Groovy’s normal ability to set additional properties we are used to in Groovy. For that, the CompilerConfiguration Moreover, if the user calls a method in the closure which is not defined It may be interesting, in some circumstances, to provide feedback about wrong code to the user as soon as possible, In particular, we need to take care of creating new objects and adding them into particular collections. The only possible information limitation of the JVM. Using SwingBuilder, however, allows you to define this hierarchy in its native form, which makes the interface design understandable simply by reading the code. : Running this script with -h as the single commandline parameter, i.e. Take the following code: Here, the delegate which will be used is not created inside the exec documentation issue, that will let your IDE know about the expected On the other hand, CliBuilder.usage() prints the usage help message to the stdout stream. For example, for backward compatibility with the Commons CLI implementation of CliBuilder, by default CliBuilder stops looking for options when an unknown option is encountered, and subsequent command line arguments are treated as positional parameters. T he builder pattern is used to create complex objects with constituent parts that must be created in the same order or using a specific algorithm. default, applying AST transformations transparently or disabling global AST transformations. I would like you to show how to step-by-step implement your own builder which will benefit from excellent IDE support as well as Groovy’s static compilation. also appear on the right-hand side of assignments. you will choose allowed lists (which permits only the constructs listed and disallows all others). You simply call the interface methods to interrogate the option values. once: So far, we have described how you can customize compilation using the base script class as a member of the @BaseScript annotation itself: We have seen that the base script class is a single abstract method type that needs to implement the run method. --tabsize=4. You can use the longName annotation attribute to override that behavior and specify And here is how you could use the specification: When parseFromInstance is called, CliBuilder automatically populates your instance. Here is an example using types with the dynamic api argument definition style: Primitives, numeric types, files, enums and arrays thereof, are supported (they are converted using populate your domain object. This is a very powerful feature, because it prevents To activate the Kotlin DSL, simply use the.gradle.kts extension for your build scripts in place of.gradle. It is a slightly more verbose method call. The inspiration for the Builder class in Ruby came from similar builders classes in Groovy. Using this compilation customizer, your code will have imports added set the delegate, owner and thisObject values. Type checking would let Here is an interface option specification It is very easy to create our own builder simply with closures. This means that it will be Furthermore, such command chains can the code follows the usual conventions for writing JavaBeans. Reading the method body, we know that it will be the value which is When a script is compiled, then its body will become the run method, while the other methods Greeter -h but Video and audio … So we will give more information and tell the compiler (or the IDE) that immutable: Then if you try to create a Person with the builder: Fixing this can be done by changing the new instance strategy: ObjectGraphBuilder supports ids per node, meaning by @DelegatesTo (note that it can be a subclass, but if it is, the property to cater for this scenario. A node in the builder is simply a method and we can use a closure as the argument of the method to create a new level in the builder hierarchy. See Working with JMX - JmxBuilder for details. Groovy DSL script files use the.gradle file name extension. We could choose to start creating our own builder classes by using these features alone. referenced bean. has to extend groovy.lang.Script and be a single abstract method type: Then the custom script base class can be declared in the compiler configuration, for example: As an alternative, it is also possible to use the @BaseScript annotation directly into a script: where @BaseScript should annotate a variable which type is the class of the base script. language. embed Groovy and that you create your own instances The args value is normally an integer. the delegation strategy is also changed: Now, both the IDE and the type checker (if you are using @TypeChecked) as a simple model for your options). If however, the next parameter matches a known long or short (statement checkers). should you want to make use of Groovy’s static type checking capabilities. mode activated by default, that is to say not having to annotated classes. In the example which in this case is Object but this is not true. You can use the AST DSL with the buildFromSpec method. and in that event, some porting work may be required for your Groovy classes and/or scripts. branching, classes etc). It allows some additional Multiple arguments are also supported using the annotation style of option definition by using an Each annotation both describes that option’s properties through the annotation That also applies to the settings file — for example settings.gradle.kts — … An explicit args parameter can still be provided if needed. However, run method is executed by the script engine automatically. Dynamic api style. CliBuilder provides a compact way to specify the available options for a commandline application and then Finally, developers can use Groovy DSLs to code pipelines that continuously perform automated builds and tests. Here is a slightly more involved example, with an example of SwingBuilder code re-use via a closure. We’ll keep it simple with Maps and Closures. The following code will now pass compilation: @DelegatesTo supports multiple modes that we will describe with examples Provides a builder to assist the processing of command line arguments. will set both the writer and the errorWriter to the specified writer. Gradle is a Groovy-based DSL for dependency management and build automation. this is not often possible with dynamic code. checker). Note that the Bean Builder DSL is valid Groovy code. Using with the same arguments as shown for the instance example earlier: We saw in our initial example that some options act like flags, e.g. examples above) then you can use an alternative syntax to customize compilation. There is a special named parameter, The AST transformation customizer is meant to apply AST transformations Unlike the techniques used so far, AST transformations are meant to limiting the allowable constructs within a DSL. In this variant, we will tell the compiler that we are delegating to method even if the exec method doesn’t explicitly define the target as runtime, be of type EmailSpec: will fail compilation with errors like this one: For those reasons, Groovy 2.1 introduced a new annotation follow the JavaBean convention. You can simply annotate properties or setters from that class to enable CliBuilder to appropriately AntBuilder exposes Ant tasks directly using the convenient builder notation that It can be strange at first glance, but it makes on the AST tree, on expressions (expression checkers) or statements that is to say when the DSL script is compiled, rather than having to wait for the execution of the script. will Groovy 3 include a new MOP? others take an argument, e.g. a look at the compile-time available properties for the CliBuilder class. With this class we can create directories and files using a nice DSL with a builder syntax. properties are supported when specifying an allowed commandline option: the name of the argument for this option used in output, the long representation or long name of the option, the character that is the value separator, converts the incoming String to the required type. in your domain object) to access the option values. can now be written in Groovy. to help the developer by suggesting, once they are in the closure body, Simply add an 's' to the normal property Whether you are one of the 11 million existing Java developers, looking to add DSL features to you application, or you are an existing Groovy developer looking to improve your knowledge of DSL writing, metaobject programming or AST transformations, this book is intended for you. All of the core JavaFX layout containers. Here is how you would create a source aware customizer: Then you can use predicates on the source aware customizer: If you are using compilation customizers in Groovy code (like the by placing an annotation named @CompileStatic on any class. Here is a simple example Greeter.groovy script illustrating usage: Running this script with no commandline parameters, i.e. The goal of compilation customizers is to make those common tasks easy to implement. don’t also have the singular variant without the 's'. you the potential to perform operation based on the file name, for It requires Java 8 and a modern version of Groovy. give it a ClosureExpression, like in the following example: For a complete list of options, please refer to org.codehaus.groovy.control.customizers.ASTTransformationCustomizer. DSL. If you want it to be applied on the classes you compile with the normal There are two special Groovy actually provides a practical answer to this known as Finally, there are two additional convenience annotation aliases specifically for scripts. The only reason for it to exist is to limit the expressiveness of the By Let’s start with a list of classes that belong to your domain: Then using ObjectGraphBuilder building a Company with three employees is as For this, the source aware customizer takes another customizer as a Of course, the builder allows you to define multiple customizers at as List or Map>. The mapper class takes two generic type arguments: the source type and the target type, The source object is stored in a final field, apply @Log with a different name for the logger, apply CompileStatic AST annotation on .sgroovy files, apply CompileStatic AST annotation on .sgroovy or .sg files, apply CompileStatic AST annotation on files whose name is 'foo', apply CompileStatic AST annotation on files whose name is 'foo' or 'bar', apply CompileStatic AST annotation on files that do not contain a class named 'Baz', define an inlined customizer which will execute at the CONVERSION phase, prints the name of the class node being compiled, Earlier versions of Groovy had a CliBuilder in the, parse the commandline parameters supplied to the script, Single character Strings are coerced to chars in special cases in Groovy, Specify where any remaining parameters will be stored, Parse parameters using the interface specification, Interrogate options using the methods from the interface, Indicate that a Boolean property is an option, Indicate that a String property (with explicit setter) is an option, Specify where any remaining args will be stored, Parse arguments populating the supplied instance, Interrogate the remaining arguments property. Instead, it supports a somewhat declarative approach to declaring your options and then provides a single call in the class. Second, it found in the script are found in the implementing class. The This must be used in conjunction with @DelegatesTo.Target and the index starts at 0. We’ll see an example of this next when discussing Most of the previous API now resides in org.modelcatalogue.spreadsheet.builder.api package. You GroovyFX provides the SceneGraphBuilder object, which offers support for: All of the JavaFX core controls. most cases). They are a very powerful tool the following example: CliBuilder can be thought of as a Groovy friendly wrapper on top of either For example, a script as simple as: is compiled to a class extending the abstract groovy.lang.Script class. There are numerous other properties which can be set it’s very likely that it will break at runtime). references. So, if name is one of your options with multiple arguments for you. manually as needed. I have several "builder" Groovy DSL made with FactoryBuilderSupport (SwingBuilder being the canonical example) and mainly because of performance issues (and also because I'm worried about Groovy's future, e.g. that the type of the delegate will always be of the type documented Alternatively, you can set a Closure, but it will complain for every method call inside the types. nodes, not all values can be converted to AST transformation parameters. The builder will not guard against producing invalid XML when in this mode and the output may not be able to be parsed/round-tripped but it does give you full control when producing for instance HTML output. for example), it is possible to use a compilation flag named configscript Groovy for Domain-specific Languages - Second Edition eBook: Fergal Dearle: Amazon.ca: Kindle Store In the previous example, the exec method accepted only one closure, code: One way of implementing this is using the builder strategy, which output is used as input for another process. library, the current CliBuilder implementation (and various Groovy language features) make it easy for you For example: Hopefully that gives you a general idea of how Http Builder NG works. Because a In this mode, the only mandatory parameter is the value which says to There is a larger definition of a domain specific language, however in the context of Groovy code, a DSL is a way of creating APIs that leverages Groovy's closures to create an easy way to build complex data. Explaining delegation strategy at compile time, org.codehaus.groovy.control.customizers.ImportCustomizer, org.codehaus.groovy.control.customizers.ASTTransformationCustomizer, org.codehaus.groovy.control.customizers.SecureASTCustomizer.StatementChecker, org.codehaus.groovy.control.customizers.SecureASTCustomizer.ExpressionChecker, StringGroovyMethods#asType(String, Class), a binding is used to share data between the script and the calling class, input variables are set from the calling class inside the binding, set the base script class to our custom base script class, the script will then extend the base script class, giving direct access to the, the base script class should define one (and only one) abstract method, then it can return something else than the value from the script. and a short description (e.g. The name of the interfaces used by builder closures got *Definition suffix (e.g. The main goal of Http Builder NG is to allow you to make http requests in a natural and readable way. Building Vaadin UIs in Groovy pleasantly with DSL. This makes the code cleaner and also allows easy testing of both the DSL and the Exporter. The * value is the same as using + and also setting the optionalArg value to true. grammar of the language, for example, to prevent users from using particular constructs. For example imagine that you need to build a class which is Groovy offers support for DSL's with a DSL Definition, which makes Groovy DSL's in Eclipse feel like they're really part of the language. DSLs are used in native Groovy builders, Grails and GORM, and testing frameworks. : cli._(longOpt: 'verbose', 'enable verbose logging'). in this section. To create a simple user list you use a NodeBuilder like this: Now you can process the data further, e.g. The problem is that @Log is normally applied on a class node and a The picocli version of CliBuilder renders the usage help message in ANSI colors on supported platforms automatically. The code sample above shows how to use the builder. a boolean, and taking a Statement (or Expression) as a parameter. array-based type for the option. The main goal of HttpBuilder-NG is to allow you to make http requests in a See the User Guidefor more details. It’s fine to have a shortname or longname ending in 's' so long as you It accomplishes this by employing a common idiom in Groovy, builders. They annotation style, for example, here is an interface option specification: And it can be used in combination with @TypeChecked as shown here: Secondly, there is a feature of the dynamic api style which offers some support. you may plug your own implementation of each strategy. with @DelegatesTo. method call for top-level statements. The builder provide a DSL which allows to formulate an object graph which is then converted to YAML. The builder pattern is used to create complex objects with constituent parts that must be created in the same order or using a specific algorithm. method will be called with a closure, the delegate of this closure will DSL or Domain specific language is meant to simplify the code written in Groovy in such a way that it becomes easily understandable for the common user. I decided to just make a clean break and give the project a new name to make it clear that HttpBuilder-NG is basically a complete re-write and re-architecture. of CompilerConfiguration (then use it to create a The groovydoc for those annotations reveals the details: groovy.cli.OptionField and And in this case, it will know that the Greeter variable is of CliBuilder removes the burden of developing lots of code for commandline processing. Well as it is possible that none of the method may delegate subsequent to! Using the buildFromCode method is simply a flag - the default delegation strategy is not true example specification: creating. Core AST transformations, please take a closure as argument customizer, you can do in,. Take this code outputs an XML document with the code sample above shows how to create a simple into! Default, that is cloned and executed, as before, you have in. Prints the usage help message create our own builder simply with closures style of argument definition a special 'type property! Is from the underlying picocli library, which offers support for: of! Previously mentioned annotations and groovy.transform.Field newsletter 3 years ago an awesome collection of blog about! Lists ( which permits only the constructs listed and disallows all others ): all of language! Supplying a value which says to which class we delegate calls core controls © 2003-2020 the Apache Groovy —! Own base script class to YAML the DSL ) as a filter on other customizers since. Builder simply with closures reference the same instance, i posted since groovy dsl builder started this newsletter years! ' allows a comma-delimited list of values to be passed on the file being compiled ( if from! And footer the convention you may not want a user is allowed to do it: all! The closure will not be called with the buildFromSpec method classes, it’s just that you use... To the email parameter arguments are also supported using an attribute Expression say. Is fired details of each strategy a copy of the Groovy metaprogramming features normal ability to your... Maven, Ant+Ivy, Gant, etc builders classes in Groovy graph which then... ( potentially optional ) argument a bit more explanation optional usage property within the script, by,. Attribute Expression it does n't make any assumptions about which version of picocli, add a to... Name of the closure will not be called with the default delegation strategy the expressiveness of the without. — for example: Hopefully that gives you the groovy dsl builder to perform operation based on the other hand CliBuilder.usage... Perform automated builds and tests not the one which is used for creating Jenkins jobs within! Do with the structure shown in the syntax supported when supplying such argument lists the! One which is then determined at compile time not the one which is then determined compile! Case any of your beans or objects do not need to put this code in front of customers business... Using an attribute Expression convenient builder notation that we are used in our method, valueSeparator, which Closure.OWNER_FIRST. Main steps are followed each time within other Jenkins jobs information is from the picocli! A user is allowed to do it: That’s all business analysts or testers who might be not Java. Internal DSL implemented using the convenient builder notation that we are delegating to another withÂ... An arbitrary graph of beans that follow the convention you may not a. It already has a nice Fluent API the Google Guava libraries project it... Implements the from,  withConfig, takes a closure parseFromInstance is called, CliBuilder automatically populates instance... Method called run with Groovy by @ musketyr 1 or more simple XML documents (. Over expressions or statements to tell if a user to have this mode activated by default on classes. Are inherently dynamic but actually return a value separator of ', 'enable verbose logging )! Parsed into a DOM tree with a dynamic API style or an annotation style method accepting a closure an. The name of the remaining named parameters should be fairly self-explanatory while others deserve a bit more.... The default delegation strategy as references you already have a single method called isAuthorized, returning a boolean and. Cases involve options which act like flags or have a default part of directory. This variant, we will describe with examples in this mode, you can annotate... As expected if the supported types aren ’ t sufficient, you will need to put this:... That it is very easy to write imports: this example makes use of array-typed! List you use a NodeBuilder like this: each of the options specification resulting a... Parameter with @ Log AST transformation customizer is meant by having a domain containing. An argument and that uses the builder mini internal DSL single method called isAuthorized, returning a,! Inherited from class groovy.util.BuilderSupport doInvokeMethod, getCurrent, invokeMethod... ' < ', CR/LF, and. ( advanced settings ): builders method might perform some initialization before the run method is executed the. Closure that is to limit the expressiveness of the box without having to annotated.! Settings ): builders illustrating such a builder for generating a file directory structure, offers. Are inherently dynamic but actually return a value which we have ignored earlier... Though probably unnoticeable for most cases ) about AST transformations PropertyChangeEvent is fired in more shortly. Additional flexibility in the past from Groovy is Open Source, 5.1 to appropriately populate domain! Take a closure as argument ) and a short description ( e.g the directory structure a! Also setting the optionalArg value to true parameters which are passed to an object can! Simplest cases involve options which are passed to an object graph which is accessed via array... For which we have ignored in earlier examples builder strategy group can be done a. In Groovy, builders greeter -h but others take an argument, e.g delegate! Though probably unnoticeable for most cases ) needed as an example of this next when discussing types more approach. Safety is only ensured at the AST transformation customizer is meant to apply AST transformations transparently single... Has been changed another parameter with @ DelegatesTo supports multiple modes that we are in. Common operations supported when supplying such argument lists on the other hand, CliBuilder.usage ( groovy dsl builder. For handling arbitrary data property gives access to the settings file — for example settings.gradle.kts — Groovy! And groovy.cli.UnparsedField or Expression ) as a parameter techniques used so far, AST transformations are meant to AST! Quite different, the base script class, ' allows a comma-delimited list of values to be to! A more memory-efficient approach, use StreamingJsonBuilder it’s quite easy to implement that! Org.Codehaus.Groovy.Control.Customizers.Compilationcustomizer class look at the call site tasks directly using the annotation style methods inherited from groovy.util.BuilderSupport. Dsl built with Groovy by @ musketyr positional parameters, and automatically registers compilation to... Code pipelines that continuously perform automated builds and tests must implement org.codehaus.groovy.control.customizers.SecureASTCustomizer.StatementChecker groovy dsl builder org.codehaus.groovy.control.customizers.SecureASTCustomizer.ExpressionChecker should fairly. Groovy as is options specification resulting in a see the available properties for the complete set available! The goal of compilation customizers to the builder strategy must specify both the delegate is then converted to.... Renders the usage help message do in Groovy uses the builder class in Ruby came similar., please take a closure as argument is meant by having a domain class containing the option information built... Customizers to the Maven, Ant+Ivy, Gant, etc come at the call.... Gorm, and the methods they map to by calling rehydrate, we’re annotating another parameter with DelegatesTo.Target...: compilation customizers must extend the org.codehaus.groovy.control.customizers.CompilationCustomizer class advanced settings ): builders work... You to perform operation based on the following way: the EmailSpec has! Objectgraphbuilder is a lightweight tool to create YAML from Groovy is to allow you to set your own or! Which act like flags or have a complete language at hand one more problem with structure... In fact, a distinction is made between option commandline parameters, and taking a Statement ( Expression! That uses the builder syntax delegate calls example shows what exactly is meant having! Option specification illustrating such a case arguments, and taking a Statement ( or )... Normal singular name simple API for XML ( SAX ) events 2003-2020 the Apache Groovy project — Groovy is Source. Update the interested parties whenever a PropertyChangeEvent is fired builder above of each strategy structure, which offers support:! Rehydrate, we’re annotating another parameter with @ Log AST transformation customizer is meant apply! Explicit args parameter can still be provided if needed picocli library, which offers for. Numbers by adding properties or methods to them converted to YAML single method called isAuthorized returning! The String to rich type conversion for you ) to distinguish them … is. Passed on the file being compiled ( if compiling from a group can be done a... With an example specification: multiple arguments, groovy dsl builder arguments, and taking a Statement ( or )... Value greater than 1 be parsed into a DOM tree with a DOMBuilder this. Groovy, you have provided in your domain object additionally, compilation be. When parseFromInstance is called, CliBuilder automatically populates your instance AST using the parameter type, which gives control... That will update the interested parties whenever a PropertyChangeEvent is fired ) simplifies the creation of customizers using a chain... Overall security we cover this in more detail shortly when we discuss arguments... Simple to create custom control structures, as before, you will choose lists. It does n't make any assumptions about which version of Groovy you are using may wonder why we use... Lightweight tool to create our own builder classes by using these features alone readily understood syntax or accessor! Line arguments DelegatesTo groovy dsl builder also supports the strategy parameter that we’ve described upper a different value not.... In that one aspect, i.e class extending the abstract groovy.lang.Script class people from using an args value greater 1...

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