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Talk:S-expressions: Difference between revisions
→TCL native types: Some of what I was thinking about
(→syntax for S-Expressions: someone in #lisp linked to the original definition of s-expressions) |
(→TCL native types: Some of what I was thinking about) |
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:: therefore tagging is already needed just to distinguish lists from atoms.--[[User:EMBee|eMBee]] 17:37, 3 November 2011 (UTC)
::: There are dirty ways to distinguish (which I use in the task on JSON) but generally speaking Tcl programmers write their code to not need to ask whether a particular word is a list or terminal; it's not a distinction that they draw. (It's a different attitude.) The "native" representation of the above would be:
::: <pre>{{data {quoted data} 123 4.5} {data {!@# 4.5 (more data)}}}</pre>
:::But as you can see there's a fair loss of information because lists ''are'' a subtype of strings and singleton lists can be rendered like their first element under (common) circumstances. The alternative to putting the tagging inline would have been to have returned a separate type descriptor. (Generating everything from the fully parsed representation is left as an exercise.) –[[User:Dkf|Donal Fellows]] 10:47, 4 November 2011 (UTC)
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