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用YACC实现的一个小的编译工具

EXAMPLE 5: POLISH

This example shows how Memphis can be used to process
Gentle structures in C/C++ code.

Like Memphis, Gentle supports domains types and pattern matching.
Unlike Memphis, Gentle provides a high level of abstraction to express
language recognition, transformation, and code generation in a uniform way. 
Combining Gentle and Memphis allows one to use a specialized and
productive compiler description language for the translation tasks of an
application, and also to use C/C++ programming e.g. to implement the user
interface.  Memphis enables seamless integration of Gentle and C/C++.

The example defines a domain type for symbolic expressions
and gives a grammar to construct these expressions from linear input.
It gives two procedures to emit such expressions in "polish" and in
"reverse polish notation". The first procedure is a Gentle predicate,
the second one is a Memphis function.

(Requires Gentle 98 or higher)