$archiver NSKeyedArchiver $objects $null $class CF$UID 37 NS.objects CF$UID 2 $class CF$UID 33 NS.keys CF$UID 3 CF$UID 4 CF$UID 5 NS.objects CF$UID 6 CF$UID 7 CF$UID 35 Title Text Date Untitled Snapshot $class CF$UID 34 NSAttributes CF$UID 10 NSDelegate CF$UID 0 NSString CF$UID 8 $class CF$UID 9 NS.string The following sections discuss how Ledger is architected, from the ground up, and will show how to use the various parts of the Ledger library from your own scripts. Ledger essentially follows five steps in reporting data to the user: @enumerate @item Parse journal file into an internal representation @item Perform any implied math within the journal file @item ``Face'' this internal representation as a virtual document @item Apply a series of transforms to the virtual document @item Display the virtual document using a formatting command @end enumerate The calculations in step two are specified by the user, such as when a posting's value might contain mathematical operators. The calculations in step four are implied in the transformations, for example when the @option{--average} option is used. At the core, however, Ledger is basically a sophisticated calculator with special knowledge about commoditized values. It knows what you mean if you add ten dollars to twenty euros, and later ask for the balance of that particular account. So it follows that first we must discuss how Ledger deals with math, and from there move on to describing how the steps above are achieved. $classes NSMutableString NSString NSObject $classname NSMutableString $class CF$UID 33 NS.keys CF$UID 11 CF$UID 12 NS.objects CF$UID 13 CF$UID 30 NSParagraphStyle NSFont $class CF$UID 29 NSAlignment 4 NSLineHeightMultiple 1.1000000238418579 NSTabStops CF$UID 14 $class CF$UID 28 NS.objects CF$UID 15 CF$UID 17 CF$UID 18 CF$UID 19 CF$UID 20 CF$UID 21 CF$UID 22 CF$UID 23 CF$UID 24 CF$UID 25 CF$UID 26 CF$UID 27 $class CF$UID 16 NSLocation 28 $classes NSTextTab NSObject $classname NSTextTab $class CF$UID 16 NSLocation 56 $class CF$UID 16 NSLocation 84 $class CF$UID 16 NSLocation 112 $class CF$UID 16 NSLocation 140 $class CF$UID 16 NSLocation 168 $class CF$UID 16 NSLocation 196 $class CF$UID 16 NSLocation 224 $class CF$UID 16 NSLocation 252 $class CF$UID 16 NSLocation 280 $class CF$UID 16 NSLocation 308 $class CF$UID 16 NSLocation 336 $classes NSArray NSObject $classname NSArray $classes NSParagraphStyle NSObject $classname NSParagraphStyle $class CF$UID 32 NSName CF$UID 31 NSSize 14 NSfFlags 16 Courier $classes NSFont NSObject $classname NSFont $classes NSDictionary NSObject $classname NSDictionary $classes KBWordCountingTextStorage NSTextStorage NSMutableAttributedString NSAttributedString NSObject $classname KBWordCountingTextStorage $class CF$UID 36 NS.time 267380389.45634499 $classes NSDate NSObject $classname NSDate $classes NSMutableArray NSArray NSObject $classname NSMutableArray $top Snapshots CF$UID 1 $version 100000