By Andy Gill, Terrance Swift
This ebook constitutes the refereed court cases of the eleventh overseas Symposium on useful elements of Declarative Languages, PADL 2009, held in Savannah, GA, united states, in January 2009, collocated with POPL 2009, the Symposium on rules of Programming Languages. The 18 revised complete papers provided including 1 invited speak have been conscientiously reviewed and chosen from forty eight submissions. the quantity positive factors unique paintings emphasizing novel functions and implementation concepts for all different types of declarative innovations, together with features, kinfolk, good judgment, and constraints. The papers deal with all present facets of declarative programming; they're geared up in topical sections on consumer interfaces and environments, networks and information, multi-threading and parallelism, databases and massive information units, tabling and optimization, in addition to language extensions and implementation.
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Additional info for Practical Aspects of Declarative Languages: 11th International Symposium, PADL 2009, Savannah, GA, USA, January 19-20, 2009, Proceedings (Lecture Notes ... Programming and Software Engineering)
Declarative Programming of User Interfaces 23 Fig. 1. A simple counter UI executed as a GUI (left) and as a WUI (right) The free variable val (of type UIRef) denotes the reference to the entry field containing the string representation of the counter’s value. It is used by the event handler reset to set the value of this entry widget to "0". The event handler incr reads the current value of this widget (by “getValue val env”) before replacing it by its incremented value (since the values in the widgets are strings, the string is transformed into an integer by “readInt v”).
5K lines of code is itself a notable result. This paper motivates and describes the overall architecture of our solution, and technical features of the DSLs that are used in place of the traditional visualization pipeline. g. Snow’s map correlating cholera cases with water pump location in London, 1854. Use of computer graphics for visualizing data is usually traced to an inﬂuential 1987 report produced for the National Science Foundation of the United States . Data from instruments and supercomputer simulation was accumulating faster than it could be interpreted, and the report called for new methods to process these ‘ﬁrehoses’.
The use of free variables for fresh references in data structures is a specific functional logic design pattern called “locally defined global identifier” . An alternative would be a global counter to create unique references that is threaded through the construction of the user interface. Such an approach leads either to a monadic programming style with an imperative flavor [5,18] or puts some restrictions on the possible dependencies between input fields and buttons . 5 Implementation Issues The definition of the components to specify a user interface, as discussed in Section 3, are contained in a library UI so that one has to import this library in order to define an interface.
Practical Aspects of Declarative Languages: 11th International Symposium, PADL 2009, Savannah, GA, USA, January 19-20, 2009, Proceedings (Lecture Notes ... Programming and Software Engineering) by Andy Gill, Terrance Swift