4.5 Section Directive
4.5 Section Directive
The section directive provides a way for the user to structure the program
and documentation into a hierarchical tree structure, just as in most large
documents. A section construct consists of a case insensitive identifying
letter, which determines the absolute level of the section in the document,
and an optional section name, which has exactly the same syntax as a
macro name.
1 Introduction
section   = "@" levelchar [name]
2 Interface
levelchar = "A" | "B" | "C" | "D" | "E" |
            "a" | "b" | "c" | "d" | "e"
3 Scanner
4 Parser
The section construct is not quite "inline", as it must appear only at the
5 Analyser
start of a line. However, unlike the "
", "
", and "
" constructs, it
6 Tangle
does not consume the remainder of the line (although it would be silly to
7 Weave
place anything on the same line anyway).
8 Shell
FunnelWeb provides five levels of sections, ranging from the highest level
9 Commands
of A (like a LaTeX chapter) to the lowest level of E (like a LaTeX
10 Glossary
subsubsubsection). FunnelWeb input files need not contain any sections at
11 References
all, but if they do, the first section must be at level A, and following
sections must not skip hierarchical levels (e.g. an @E cannot follow an
@C). FunnelWeb generates an error if a level is skipped.
All section 
  have names associated with them, but for convenience,
the section name is optional if the section contains one or more macro
definitions (i.e. at least one macro definition appears between the section
construct in question and the next section construct in the input file.). In
this case, the section 
  the name of the first macro defined in the
section. This feature streamlines the input file, avoiding duplicate name
Any sequence of printable characters can be used in the section name,
even the target typesetter s escape sequence (e.g. in TeX, "
The following example demonstrates the section construct.
This is the main simulation module for planet
earth, simulated down to the molecular level. This
is a REALLY big program. I mean really big. I
mean, if you thought the X Windows source code was
http://www.ross.net/funnelweb/reference/parser_type_section.html (1 of 2) [3/3/2000 10:46:35 PM]

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