What is the test for determining whether a plaintiff is a prevailing party?

pleadings, trial briefs, opening statements, and similar sources. The prevailing party determination is to be made only upon final resolution of the contract claims and only by 'a comparison of the extent to which each party ha[s] succeeded and failed to succeed in its contentions.'" (Hsu v. Abbara (1995) 9 Cal.4th 863, 876.) "[I]n determining litigation success, courts should respect substance rather than form, and to this extent should be guided by 'equitable considerations.' For example, a party who is denied direct relief on a claim may nonetheless be found to be a prevailing party if it is clear that the party has otherwise achieved its main litigation objective." (Id. at p. 877, italics omitted.)