Saturday, November 13, 2010

Abusing NSPredicate

Dave DeLong:

One of the best things about NSPredicate is its parsing engine. Given a well-formatted NSString, NSPredicate will turn it into a tree of NSCompoundPredicate and NSComparisonPredicate objects. This can be used to our advantage. If we have a string that represent some boolean expression, we can tap NSPredicate to parse it for us and give us back an organized syntax tree.

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[...] abusing NSPredicate, Dave DeLong has moved on to writing his own parser in Objective-C. Number handling is via [...]

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