The language WMLScript is a subset of ECMAScript (ie JavaScript). WMLScript defines also an bytecode interpreter (stack based), a binary format.
WMLScript is a part of the Wireless Application Protocol specifications.
The complete specification are available on http://www.openmobilealliance.org/ (formerly http://www.wapforum.org/)
WAP-193_101-WMLS-20010928-a
WMLScript Specification, Version 28-Sept-2001
WAP-194-WMLSL-20000925-a
WMLScript Standard Libraries Specification, 25-SEP-2000
The translator is in 3 files src/script.pir, src/opcode.pir (generated by build/translator.pl from src/translation.rules) and src/stdlibs.pir (generated by build/stdlibs.pl from src/wmlslib.cfg).
There are 4 applications :
wmlsd.pir : a disassembler
wmls2pir.pir : a PIR translator
wmls2pbc.pir : a PIR translator & PBC compiler
wmlsi.pir : an interpreter
The design of the Translator & Stack to Register Mapping comes from the Jonathan Worthington's work (see languages/dotnet/doc/contents.pod).
Find optimization (like Register or OptRegister) compatible with opcodes SCAND & SCOR. These 2 opcodes pop one value, and push one or two values.
languages/WMLScript/pmc/wmlsbytecode.pmc is a singleton PMC what holds a method load. This method is used to decode Bytecode File Format.
There are five types in WMLScript, each of them is implemented by a PMC.
Integer dynext/pmc/wmlsinteger.pmc
Floating-Point dynext/pmc/wmlsfloat.pmc
String dynext/pmc/wmlsstring.pmc
Boolean dynext/pmc/wmlsboolean.pmc
Invalid dynext/pmc/wmlsinvalid.pmc
dynext/ops/wmls.ops defines opcode with new signature.
Some of these libraries are implemented in :
Lang wmlscript/library/wmlslang.pir
Float wmlscript/library/wmlsfloat.pir
String wmlscript/library/wmlsstring.pir
Console wmlscript/library/wmlsconsole.pir
wmlscript/wmlsstdlibs.pir gives an unique entry point and implements some helpers.
Some of these libraries are incomplete.
Francois Perrad.