GIN Macros [ICL George 3]

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====== GIN Macros ======

A macro definition consists of a series of source records enclosed between the directives #MACRO and #NORMAL. It may contain anything except the directives #GO, #MACRO, #USE and #READ. Each macro has a name, consisting of a letter followed by 0 to 7 alphanumeric characters. A macro name must be unique, and its first four characters must be different from the first four characters of any instruction mnemonic.

At any point in a macro definition a formal parameter may be included.  A formal parameter consists of the character % followed by a letter. (It is not possible to use % for any other purpose within a macro definition). When the macro is called, %A will be replaced by the first actual parameter in the call line, %B by the second, and so on.

The absence of restrictions on what may appear on a line allows directives, macro calls, labels, or even erroneous lines to be stored. Storing erroneous lines can be useful for parameter validation. Suppose for example that %B is expected to be an expression whose value does not exceed that of identifier **AMAX**: then the following coding would cause the parameter to be checked:
<code>#SKI %B>AMAX&AMAX
! PARAMETER OUT OF RANGE: %B
#SKI %B>AMAX&AMAX<1&1
(
body of macro
)</code>

[[index-macroA|A]]
[[index-macroB|B]]
[[index-macroC|C]]
[[index-macroD|D]]
[[index-macroE|E]]
[[index-macroF|F]]
[[index-macroG|G]]
[[index-macroH|H]]
[[index-macroI|I]]
[[index-macroJ|J]]
[[index-macroK|K]]
[[index-macroL|L]]
[[index-macroM|M]]
[[index-macroN|N]]
[[index-macroO|O]]
[[index-macroP|P]]
[[index-macroQ|Q]]
[[index-macroR|R]]
[[index-macroS|S]]
[[index-macroT|T]]
[[index-macroU|U]]
[[index-macroV|V]]
[[index-macroW|W]]
[[index-macroX|X]]
[[index-macroY|Y]]
[[index-macroZ|Z]]