Doszedł do mnie taki oto kawałek: `

>>> 0x0 +2
4
>>> 0x0 +3.5
6.5
>>> 0x0 +2e1
757

` Zagadka za 0 punktów: co to za język programowania? :>

Przyszło od razu z wyjaśnieniem:

 once their lexer detects "0x", it skips all '0's, then calls strtol()

 so: tokptr = "0x0 +2;", toklen = 3

 skip 0x: tokptr = "0 +2;", toklen = 1

 skip all '0's: tokptr = " +2;", toklen = 0

 call strtol(" +2", NULL, 16) ==> 2

 then it proceeds to parse the remaining program starting from " +2;"

       because that's where the previous token ends

 and this is how 0x0 ends up having the value 2

 0x0 +2e1 ends up being 757 because the first pass interprets 2e1 as a

hex integer

       while the second pass thinks it's a floating point number

 so it's really 0x2e1 + 2.0e1

Komentarze

Stanisław ‘dozzie’ Klekot (2012-12-05 17:49:02): Holy fscking bubbles! To nawet ja takich baboli nie wstawiłem w swoich parserach, a za eksperta się nie uważam O_o Ale trzeba być naprawdę głupim żeby tak spaprać tokenizer pisany we fleksie.
mt3o (2012-12-05 18:17:57): PHP. Było na roflcopter.
pecet (2012-12-05 18:59:44): PHP. Było na roflcopter.
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0x0 +2