3.12 Pragma: Indentation

3.12 Pragma: Indentation

When FunnelWeb expands a macro, it can do so in two ways.

First it can treat the text it is processing as a one dimensional

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stream of text, and merely insert the body of the macro in place

of the macro call. Second, it can treat the text of the macro as a

Developer

two dimensional object and indent each line of the macro body

by the amount that the macro call itself was indented. Consider

Reference

the following macros.

1 Introduction

2 Interface

@$@@{@ 

i=1;

3 Scanner

while (i<=N)

4 Parser

   @

5 Analyser

endwhile

6 Tangle

@}

7 Weave

8 Shell

@$@@{@ 

9 Commands

a[i]:=0;

10 Glossary

i:=i+1;@}

11 References

Under the regime of 

no indentation

 the loop structure macro

expands to:

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i=1;

while (i<=N)

   a[i]:=0;

i:=i+1;

endwhile

Under the regime of 

blank indentation

 the loop structure

macro expands to:

i=1;

while (i<=N)

   a[i]:=0;

   i:=i+1;

endwhile

The indentation pragma determines which of these two regimes

will be used to expand the macros when constructing the

product files. The syntax of the pragma is:

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