CAS

1
CAS

• AKA caScript

2
Core features of CAS

• Component Manipulation
• Data Structure Manipulation
• Variable Management
• Error System
• The editor

3
Component Manipulation

• Support for almost every method is available in
  caScript.
• Support is based on what is being passed between
  methods.
• Support is primarily based on the existence of
  annotation keyword _at_Script.
• The language can be modified to support different
  kinds of parameters.

4
Example

• _at_Script public void prune(DSDataSet data, int
  size)
• DSMicroarraySetltDSMicroarraygt maSet
  null
• if (data instanceof DSMicroarraySet)
• maSet (DSMicroarraySetltDSMicroarray
  gt)data
• else
• return
• if (maSet.size() gt size)
• Collections.shuffle(maSet)
• int count 0
• for (DSMicroarray array maSet)
• array.setSerial(count)
• int initialSize maSet.size()
• for (int i initialSize - 1 i gt
  size i--)
• maSet.remove(i)
• publishFilteringEvent(new
  FilteringEvent(maSet, maSet, getLabel()
  "_at_Script prune size " size))

5
Data Structure Manipulation

• caScript supports entire Bison ontology of data
  structures through interfaces.
• Data Structures work like JAVA objects.

6
Error System

• The caScript error system spans from its own
  errors (lexing, parsing, interpretation, bad
  code) to reporting difficulties with geWorkBench.
• The error system can always be more robust and
  useful.
• Some errors are badly reported due to ANTLR.

7
ANTLR

• ANother Tool for Language Recognition
• www.antlr.org
• Basically a lexical analysis, syntactic analysis,
  and semantic analysis generator
• New edition promises to be more robust
• Current edition still has some issues (non LL(),
  bad error generation and recovery)

8
CAS editor

• The editor displays what modules are supported.
• The editor displays what methods of the module
  are supported.
• Double-clicking module names paste a module
  variable declaration onto the editor.
• Double-clicking method names paste method calls
  onto the editor.
• Single-clicking module names display available
  methods.
• Single-clicking method names display the javadoc
  for the method.