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documentationf A traversal combinator in the spirit of SSAX's @ref{sxml transform
pre-post-order,,pre-post-order}.
@code{fold-layout} was originally presented in Andy Wingo's 2007 paper,
@emph{Applications of fold to XML transformation}.
@example
bindings := (<binding>...)
binding := (<tag> <bandler-pair>...)
| (*default* . <post-handler>)
| (*text* . <text-handler>)
tag := <symbol>
handler-pair := (pre-layout . <pre-layout-handler>)
| (post . <post-handler>)
| (bindings . <bindings>)
| (pre . <pre-handler>)
| (macro . <macro-handler>)
@end example
@table @var
@item pre-layout-handler
A function of three arguments:
@table @var
@item kids
the kids of the current node, before traversal
@item params
the params of the current node
@item layout
the layout coming into this node
@end table
@var{pre-layout-handler} is expected to use this information to return a
layout to pass to the kids. The default implementation returns the
layout given in the arguments.
@item post-handler
A function of five arguments:
@table @var
@item tag
the current tag being processed
@item params
the params of the current node
@item layout
the layout coming into the current node, before any kids were processed
@item klayout
the layout after processing all of the children
@item kids
the already-processed child nodes
@end table
@var{post-handler} should return two values, the layout to pass to the
next node and the final tree.
@item text-handler
@var{text-handler} is a function of three arguments:
@table @var
@item text
the string
@item params
the current params
@item layout
the current layout
@end table
@var{text-handler} should return two values, the layout to pass to the
next node and the value to which the string should transform.
@end table
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