AltME: Parse

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Tuesday 4th August, 2015

Endo

11:14:-) I beat you both :P

Geomol

11:16Why is complemented charset not useful?

Endo

11:16Because I need to NOT a word.

11:17Something like:

>> parse/all "this" [some ["this" (print "ok" halt) | skip] ]
ok

>> parse/all "this" [some ["that" (print "ok" halt) | skip] ]
== true

11:17But I don't know how to stop PARSE in the first example.

11:17Instead of HALTing.

Geomol

11:40to end 1 skip

11:40Which will always return false, I think.

11:41or just: to end skip

Endo

11:48Sorryi I confused I think, how do I write "except this one" like rule.

>> not-four: ["four" to end skip]
== ["four" to end skip]

>> parse/all "one two three" ["one " not-four " three"]
== false

Geomol

11:51>> parse/all "one two three" ["one " [not-four | to " "] " three"]
== true

Or use block parsing, if that's an option.

11:51argh :)

Doesn't work.

11:55I guess, you need to include all the ok possibilities?

Endo

11:55Block parsing could be useful but I'm parsing huge SQL files which are not LOADable (and different formats from each other).
Switching to R3 is easier.

11:56I think I need to play with index positions during the parse.

11:56Thank you for your time Geomol.

Geomol

11:59welcome

Endo

13:17I'll go with regular expression, ^((?!four).)*$
gives the lines does not contain "four".

Wednesday 5th August, 2015

sqlab

07:22not-four: [[(not-four/2: [])  "four" (not-four/2:  [thru end skip] ) | to " "]  []]

>> parse/all "one two three" ["one " not-four  " three"  ]
== true
>> parse/all "one four three" ["one " not-four  " three"  ]
== false

Gabriele

08:49A variation of sqlab's approach:

>> space: [some #" "]
== [some #" "]
>> parse/all "one two three" [(fail?: none) "one" space ["four" space (fail?: [end skip]) | to #" " space] fail? "three"]                                                == true
>> parse/all "one four three" [(fail?: none) "one" space ["four" space (fail?: [end skip]) | to #" " space] fail? "three"]                                               == false
>> parse/all "one five three" [(fail?: none) "one" space ["four" space (fail?: [end skip]) | to #" " space] fail? "three"]                                               == true

Gabriele

09:04If your case is more specific maybe it can be done in a different way, like checking for the condition after parsing, or filtering out the input you don't want in advance, and so on.

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