section‹Standard ML within the Isabelle environment›
theory Examples imports Pure begin
text‹
Isabelle/ML is a somewhat augmented version of Standard ML, with various
add-ons that are indispensable for Isabelle development, but may cause
conflicts with independent projects in plain Standard ML.
The Isabelle/Isar command 🚫‹SML_file› supports official Standard ML within
the Isabelle environment, with full support in the Prover IDE
(Isabelle/jEdit).
Here is a very basic example that defines the factorial function and
evaluates it for some arguments. ›
SML_file ‹factorial.sml›
text‹
The subsequent example illustrates the use of multiple 🚫‹SML_file› commands
to build larger Standard ML projects. The toplevel SML environment is
enriched cumulatively within the theory context of Isabelle ---
independently of the Isabelle/ML environment. ›
SML_file ‹Example.sig›
SML_file ‹Example.sml›
text‹
Isabelle/ML and SML share a common run-time system, but the static
environments are separate. It is possible to exchange toplevel bindings via
separate commands like this. ›
SML_export ‹val f = factorial›―‹re-use factorial from SML environment›
ML ‹f 42›
SML_import ‹val println = Output.writeln› ―‹re-use Isabelle/ML channel for SML›
SML_import ‹val par_map = Par_List.map› ―‹re-use Isabelle/ML parallel list combinator for SML›
end
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