theory Scala
imports Base
begin
chapter {* Isabelle/Scala development tools *}
text {* Isabelle/ML and Isabelle/Scala are the two main language
environments for Isabelle tool implementations. There are some basic
command-line tools to work with the underlying Java Virtual Machine,
the Scala toplevel and compiler. Note that Isabelle/jEdit
(\secref{sec:tool-tty}) provides a Scala Console for interactive
experimentation within the running application. *}
section {* Java Runtime Environment within Isabelle \label{sec:tool-java} *}
text {* The Isabelle @{tool_def java} utility is a direct wrapper for
the Java Runtime Environment, within the regular Isabelle settings
environment (\secref{sec:settings}). The command line arguments are
that of the underlying Java version. It is run in @{verbatim
"-server"} mode if possible, to improve performance (at the cost of
extra startup time).
The @{verbatim java} executable is the one within @{setting
ISABELLE_JDK_HOME}, according to the standard directory layout for
official JDK distributions. The class loader is augmented such that
the name space of @{verbatim "Isabelle/Pure.jar"} is available,
which is the main Isabelle/Scala module.
For example, the following command-line invokes the main method of
class @{verbatim isabelle.GUI_Setup}, which opens a windows with
some diagnostic information about the Isabelle environment:
\begin{alltt}
isabelle java isabelle.GUI_Setup
\end{alltt}
*}
section {* Scala toplevel \label{sec:tool-scala} *}
text {* The Isabelle @{tool_def scala} utility is a direct wrapper for
the Scala toplevel; see also @{tool java} above. The command line
arguments are that of the underlying Scala version.
This allows to interact with Isabelle/Scala in TTY mode like this:
\begin{alltt}
isabelle scala
scala> isabelle.Isabelle_System.getenv("ISABELLE_HOME")
scala> isabelle.Isabelle_System.find_logics()
\end{alltt}
*}
section {* Scala compiler \label{sec:tool-scalac} *}
text {* The Isabelle @{tool_def scalac} utility is a direct wrapper
for the Scala compiler; see also @{tool scala} above. The command
line arguments are that of the underlying Scala version.
This allows to compile further Scala modules, depending on existing
Isabelle/Scala functionality. The resulting class or jar files can
be added to the @{setting CLASSPATH} via the @{verbatim classpath}
Bash function that is provided by the Isabelle process environment.
Thus add-on components can register themselves in a modular manner,
see also \secref{sec:components}.
Note that jEdit (\secref{sec:tool-jedit}) has its own mechanisms for
adding plugin components, which needs special attention since
it overrides the standard Java class loader. *}
end