I am doing, for several months, constant-space processing of large XML
files using iteratees. The file contains many XML elements (which are
a bit complex than a number). An element can be processed
independently. After the parser finished with one element, and dumped
the related data, the processing of the next element starts anew, so
to speak. No significant state is accumulated for the overall parsing
sans the counters of processed and bad elements, for statistics. XML
is somewhat like JSON, only more complex: an XML parser has to deal
with namespaces, parsed entities, CDATA sections and the other
interesting stuff. Therefore, I'm quite sure there should not be
fundamental problems in constant-space parsing of JSON.
BTW, the parser itself is described there
http://okmij.org/ftp/Streams.html#xml
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