My first Python program -- a lexer

Thomas Mlynarczyk thomas at mlynarczyk-webdesign.de
Mon Nov 10 14:29:02 CET 2008


Paul McGuire schrieb:

> loc = data.index("list")
> print data[:loc].count("\n")-1
> print loc-data[:loc].rindex("\n")-1
> 
> prints 5,14
> 
> I'm sure it's non-optimal, but it *is* an algorithm that does not
> require keeping track of the start of every line...

Yes, I was thinking of something like this. As long as the line/column 
are only needed in case of an error (i.e. at most once per script run), 
I consider this more performant than keeping track of line/column for 
every token.

Greetings,
Thomas

-- 
Ce n'est pas parce qu'ils sont nombreux à avoir tort qu'ils ont raison!
(Coluche)



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