Feature: Implement NSRuleEditor - #856
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Every method was a stub, so an editor had no rows, asked its delegate for nothing and produced no predicate. The editor now keeps its rows in a tree, walks the delegate for the criteria and display values a row starts out with, lays those out a row at a time, and builds a predicate from the parts the delegate gives for each criterion. The row a nesting mode calls for is made along with the first row it holds, and the rows of a list are joined with or.
START_SET creates an autorelease pool and END_SET releases it, so the pool these tests create around the set is redundant.
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Every method of NSRuleEditor was a stub, so an editor had no rows, asked its delegate for nothing and produced no predicate. NSPredicateEditor is built on it and could not work either.
The editor now keeps its rows in a tree. A new row is filled by walking the delegate from the root of its criteria, taking the first child at each step and asking for a display value, until the delegate offers no more. The display values are laid out a row at a time, indented by how deep the row sits. The predicate of a row is assembled from the parts the delegate gives for each of its criteria, and a compound row joins the rows under it with the compound type its own criterion carries. A single editor holds one row, a list joins its rows with or, and the nesting modes that hold rows under a compound row make that row along with the first row it holds.
Choosing another item in a row does not yet rebuild the criteria under it, the formatting dictionary is kept but not applied, and rows are not animated. The class gains instance variables.
Tests/gui/NSRuleEditor/basic.m. 29 assertions fail before the change and pass after.
Refers to #96.