Design Problem Solving

6.3.6 The DSPL Interpreter

DSPL is interpreted by a set of functions that are highly structured to reflect the

structure of the language. For example, there are parts of the interpreter responsible

for executing steps, step bodies, and step body items. Each part of the interpreter can

be passed a message, and will return one, even if it is only the message received from

below. Each part is responsible for detecting failure messages and acting

appropriately. In situations where a failure needs to be handled a system failure

handler appropriate for the failing situation is called. Some failure handlers call for

redesign,

in which case the appropriat ...