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Re: Cell execution dependence

  • To: mathgroup at
  • Subject: [mg61982] Re: Cell execution dependence
  • From: carlos at
  • Date: Sun, 6 Nov 2005 19:46:26 -0500 (EST)
  • References: <dkks4q$r91$>
  • Sender: owner-wri-mathgroup at

Would this then be correct (in BNF)

<whitespace-char> ::= <active-whitespace-char> |

<active-whitespace-char> ::=    (blank | tab | linefeed )
                              &  activity-flag:ON
<inactive-whitespace-char> ::=  (blank | tab | linefeed )
                              &  activity-flag:OFF

If this is OK, the main interpreter burden for this
classification is to determine activity. Ideally this
should depend only on examining previous chars,
already digested by the parser.  But since
Mathematica allows implicit multiplication, a
postscan  might be required.

Eg     sin (a+b)  means sin*(a+b)  (active blank)
but    Sin [a+b]  means Sin[a+b]   (inactive blank)

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