4.14 Macros Are Static
4.14 Macros Are Static
In FunnelWeb, the actions of 
macro definition
  and 
macro
expansion
  occur during two separate phases (parser and tangle)
Tutorial
and cannot be interleaved. As a result, the FunnelWeb macro
facility is completely static. It is not possible for one macro to
Developer
define another while the first macro is being expanded; each
must be defined statically. It is not possible to define a macro to
Reference
even assist in the definition of other macros. Because the
scanner, parser, analyser, and tangler phases are all invoked
1 Introduction
sequentially, there is no room for feedback of definitions
2 Interface
between different levels (e.g. the user cannot define a macro for
3 Scanner
the vskip pragma).
4 Parser
5 Analyser
This lack of power is fully intentional. By totally excluding the
more incomprehensible ways in which a general purpose macro
6 Tangle
preprocessor can be used, FunnelWeb provides definite
7 Weave
guarantees to the reader of its input files:
8 Shell
FunnelWeb guarantees that a piece of text does not
G   
9 Commands
contain a macro call unless it contains the special
10 Glossary
character followed by < or #.
11 References
FunnelWeb allows calls to be made to macros that are
G   
defined later in the input file.
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Copyright   Ross N. Williams 1992,1999. All rights
reserved.
http://www.ross.net/funnelweb/reference/parser_static.html [3/3/2000 10:47:03 PM]





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