4.14 Macros Are Static
4.14 Macros Are Static
In FunnelWeb, the actions of 
macro definition
  occur during two separate phases (parser and tangle)
and cannot be interleaved. As a result, the FunnelWeb macro
facility is completely static. It is not possible for one macro to
define another while the first macro is being expanded; each
must be defined statically. It is not possible to define a macro to
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
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
defined later in the input file.
Copyright   Ross N. Williams 1992,1999. All rights
http://www.ross.net/funnelweb/reference/parser_static.html [3/3/2000 10:47:03 PM]

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