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| control structure | do ... done | ||||
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Syntax
do action* done
You can use do and done to create a block of code that will be treated as a unit. There are two reasons to do this: to limit the scope of variables, and to associate more than one action with a usingstatement:
open my-file as file "mine.txt"
using output as my-file
do
local stream bio
set bio to "more about me"
output "my name"
output bio
done
The variable "bio" exists only within the do...done block. All output within the block is sent to the destination specified by the preceding using statement.
A do...done block may contain only actions. It cannot contain rules or group statements.
It is possible to apply a condition to a whole do...done block by adding a condition after the done. Conditions appearing after the done apply to the whole block, and are evaluated prior to any conditons that appear within the block. For example, the actions within the following do...done block will be executed only when the attribute "margin" of the parent element is specified:
do
decrement page-width by attribute margin
using attribute margin of parent output "\newmarg{%v(margin)}%n"
done when attribute margin of parent is specified
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Related Syntax do when, do unless do select do sgml-parse do skip do scan do xml-parse when, unless |
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