3.11 Pragmas
3.11 Pragmas
Most tools have to support some essential, but rather inelegant
features. In FunnelWeb these messy bits have all been stuffed
Tutorial
into the scanner s 
pragma
 (for 
pragma
 tic) construct.
A pragma consists of a single line of input (including the EOL)
Developer
commencing with @p. This must be followed by a single space,
and then the pragma verb. This must be followed by a sequence
Reference
of zero or more arguments separated by one or more spaces.
1 Introduction
Four pragmas are available
2 Interface
3 Scanner
pragma = pragma_ident | pragma_mill |
4 Parser
         pragma_moll | pragma_typesetter
5 Analyser
The following syntax definitions assist in defining the pragmas.
6 Tangle
7 Weave
s        = {" "}+
8 Shell
ps       = ("@p" | "@P") " "
9 Commands
number   = { decimal_digit }+
10 Glossary
numorinf = number | "infinity"
11 References
The arguments to pragmas are case sensitive and must be
specified in lower case.
SEARCH
Pragmas are processed and consumed entirely by the scanner.
The parser never sees them and so they can play no part in the
parser level syntax. As a result, pragma lines can appear
anywhere in the entire input file regardless of the surrounding
context (e.g. even in the middle of a macro definition). The sole
effect of a pragma is to modify some internal parameter of
FunnelWeb.
The following sections describe the four FunnelWeb pragmas.
Webmaster
    
Copyright   Ross N. Williams 1992,1999. All rights
reserved.
http://www.ross.net/funnelweb/reference/scanner_prag.html [3/3/2000 10:47:48 PM]





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