The Processing Instruction (PI) Macro
The PI (Processing Instruction) macro provides a means of defining the separator text to be inserted between the code pieces (which represent entities) that are generated using a template.
The structure for setting the Processing Instruction is:
where <value> is a literal string enclosed by double quotes, with the following options:
|•||"\n" - New line (the default)|
|•||" " - Space|
|•||"\t" - Tab|
|•||"" - Null |
By default, the PI is set to generate a new line (\n) for each non-empty substitution, which behavior can be changed by resetting the PI macro. For instance, a Class's Attribute declaration in simple VB code would be generated to a single line statement (with no new lines). These properties are derived from the Class-Attribute Properties in the model to generate, for example:
Private Const PrintFormat As String = "Portrait"
The template for generating this starts with the PI being set to a space rather than a new line:
%if attConst == "T"%
On transforming this, attscope returns the VB keyword "Private" and attConst returns "Const" on the same line spaced by a single space (fitting the VB Class.Attribute definition example above).
Alternatively, when generating a Class you might want the Class declaration, the notes and Class body all separated by double lines. In this case the %PI is set to "/n/n" to return double line spacing:
|•||Blank lines have no effect on the output|
|•||Any line that has a macro that produces an empty result does not result in a PI separator (space/new line)|
|•||The last entry does not return a PI; for example, %Classbody% (above) does not have a double line added after the body|