9.1. Loops

Loops group a section of instructions and loops them. Jam has three kinds of loops. A generic loops without a condition, a while loop with a simple condition and a for loop for interaction.

While inside of a loop, the break and next statements can be used to control the behaviour of the loop.

Break              ::=  "break"
Next               ::=  "next"
LoopInstruction    ::=  Instruction | Break | Next
LoopInstructionSet ::=  ( LoopInstruction \n )*
Loop               ::=  GenericLoop | WhileLoop | ForLoop
GenericLoop        ::=  "loop" LoopInstructionSet "end"
WhileLoop          ::=  "while" Value LoopInstructionSet "end"