tokmap – Iterate over a token list expandably, without dropping spaces or braced groups

Usage: \tokmap <command> { <tokens> } applies command over the token list tokens. Space tokens, left and right braces are replaced with the marker tokens \tokmap@space, \tokmap@bgroup, and \tokmap@egroup respectively (which are \ifx-equal to themselves exclusively). For convenience, command may contain multiple tokens. It is assumed that { and } are the only characters with category codes 1 (beginning of group) and 2 (end of group) respectively. Expandable.

This package may be used in LaTeX by \usepackage{tokmap}, or in plain TeX and other formats by \input{tokmap}.

See the visualtoks package for an example application.

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