Utility fake2strop converts pseudo-algol using reserved keywords into quote-stropped format.
(and sister utility a60tobold converts to bold-keyword HTML)

filter.c, wfilter.c, and qfilter.c canonicalise the most common stropped formats for parsing
by algol9ps  qfilter.c is the one for properly stropped (single-quote) keywords, such as 'BEGIN'.

Other forms allowed are double-quote quoted ("BEGIN"), and keywords only in upper case (BEGIN)
(I can't remember offhand if filter or wfilter do these? I do remember that 'wfilter' stood for
W-Algol filter (not "walgol" or "algol-w" which are both different beasts!).

Two filters for less common KDF9 variants are missing - keywords via underlining (e.g. _b_e_g_i_n),
and Atlas-Autocode style %-stripping:  %begin

There's also yet another kdf9 convention from kalgol, !-stropping:  !begin
(watch out for !KDF9 keyword)

algol9ps converts canonicalised source into publication-syntax html for browsing.  It also
formats the indentation on the fly, although currently (due to the html output format) it
can't be used as a "SOAP" substitute.  I may go back to this later and allow simple text
output in some approximation to a standard machine-specific form.

Note that the canonicalisation procedure loses case significance in identifiers and loses
spaces within identifiers. Fixing that will take a replacement of the parser generator
with a better one designed specifically for handling source to source transformations.
The a60tobold utility avoids those issues but *only* emboldens - it does not generate
publication syntax.