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Category:M4: Difference between revisions
m
correction, changequote() for the quote chars, not changecom()
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m (correction, changequote() for the quote chars, not changecom()) |
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Control flow is limited to <code>ifelse</code>, but it's easy to construct loops by recursion. GNU m4 includes examples of macros implementing various general-purpose loops.
Quoting data values against premature or unwanted expansion can be a little tricky. The default quote characters are <code>`</code> and <code>'</code>. If they would occur in text too often then <code>
When a macro expands, its value (with <code>$1</code> etc parameters substituted) is re-read as input. This is how macro definitions can contain further macros to expand.
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